Artículos en revistas científicas

Línea de InvestigaciónAñoAutoresTítuloRevistaFicha de PublicaciónDOIAbstractAccesoPáginasVolumenIndexKey Words
Servicios Ecosistémicos2013Delgado-Baquerizo, M., Maestre, F. T., Gallardo, A., Bowker, M. A., Wallenstein, M. D., Quero, J. L., Gómez-González, S., … Zaady, E.Decoupling of soil nutrient cycles as a function of aridity in global drylandsNature10.1038/nature12670The iconic conifer Araucaria araucana (Araucaria), called Pehuén by native people, is an endemic species of the Andes of northern Patagonia in Chile and Argentina. Its range encompasses only three degrees of latitude (37 ◦ 20 – 40 ◦ 20 S) with a small outlying presence in the coastal mountains of Chile (Veblen et al. 1995). The species is classified as endangered (Premoli et al. 2013) because of extensive logging and human-set fires.
Araucaria araucana has a long history of ethnobiological importance. For centuries the Pehuén fruits have been a vital sustainable food source for the Pehuenche people (Mapuche) and today the growing industry of ecotourism indirectly serves to protect these forests (Aagesen 1998; González et al. 2013). After a long history of human destruction of A. araucana forests, which reduced its range to half its original distribution, Chile and Argentina now legally protect this endangered species. These ecosystems continue to be threatened by logging, fires, and extensive livestock use. These factors, and the potential threats posed by climate change, are among the main challenges to A. araucana conservation (González and Lara
2015). is.7473Thomson Reuters ISIcalcium carbonate, carbon, nitrogen, organic matter, phosphatase, aridity, biogeochemical cycle, climate change, climate effect, concentration (composition), ecosystem service, global perspective, soil nutrient, terrestrial ecosystem, twenty first century, water availability, article, carbon cycle, controlled study, desertification, litter decomposition, mineralization, nitrogen cycle, phosphorus cycle, priority journal, soil, soil erosion, soil moisture, weathering, aluminum silicates, biomass, desert climate, desiccation, ecosystem, geography, models, theoretical, phosphoric monoester hydrolases, phosphorus, plants
Modelación y Sistemas de Observación2013Eby, M., Weaver, A. J., Alexander, K., Zickfeld, K., Abe-Ouchi, A., Cimatoribus, A. A., Shaffer, G., … Zhao, F.Historical and idealized climate model experiments: an intercomparison of Earth system models of intermediate complexityClimate of the Past10.5194/cp-9-1111-2013The effect of the high frequency (synoptic) variability of wind and heat fluxes upon the surface ocean off south-central Chile (west coast of South America) is investigated using a regional ocean model. We focus our analysis in austral summer, when the regional wind experiences significant day-to-day variability superimposed on a mean, upwelling favorable flow. To evaluate the nature and magnitude of these effects, we performed three identical simulations except for the surface forcing: the climatological run, with long-term monthly mean wind-stresses and heat fluxes; the wind-synoptic run, with daily wind stresses and climatological heat fluxes; and the full-synoptic run, with daily wind-stresses and daily fluxes. The mean currents and surface geostrophic EKE fields show no major differences between simulations, and agree well with those observed in this ocean area. Nevertheless, substantially more ageostrophic EKE is found in the simulations which include synoptic variability of wind-stresses, impacting the total surface EKE and diffusivities, particularly south of Punta Lavapie (37° S), where the lack of major currents implies low levels of geostrophic EKE. Summer mean SSTs are similar in all simulations and agree with observations, but SST variability along the coast is larger in the runs including wind-stress synoptic variability, suggesting a rather linear response of the ocean to cycles of southerly wind strengthening and relaxation. We found that coastal SST variability does not change significantly in the first tenths of kilometers from the shore when including daily heat fluxes, highlighting the prominent role of wind-driven upwelling cycles. In contrast, in the offshore region situated beyond the 50 km coastal strip, it is necessary to include synoptic variability in the heat fluxes to account for a realistic SST variability. is.3Thomson Reuters ISIair temperature, carbon cycle, carbon dioxide, carbon flux, climate feedback, climate forcing, climate modeling, comparative study, data set, emission inventory, experimental study, historical record, intergovernmental panel on climate change, little ice age, medieval, paleoclimate, reconstruction, trend analysis
Dinámica del Clima2013Flores, F., Garreaud, R., & Muñoz, R. C.CFD simulations of turbulent buoyant atmospheric flows over complex geometry: Solver development in OpenFOAMComputers & Fluids10.1016/j.compfluid.2013.04.029Past global climate changes had strong regional expression. To elucidate their spatio-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the past one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the nineteenth century. At multi- decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between ad 1580 and 1880, punctuated in some regions by warm decades during the eighteenth century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the period ad 1971-2000, the area-weighted average reconstructed temperature was higher than any other time in nearly 1,400 years. D Reuters ISIcfd, les, openfoam, wind engineering, a1. largeeddy simulations (les), boundary and initial conditions, detached eddy simulations, initial and boundary conditions, multiphysics problems, buoyancy, geometry, large eddy simulation, turbulence, computational fluid dynamics
Dinámica del Clima; Modelación y Sistemas de Observación2013Garreaud, R., Lopez, P., Minvielle, M., & Rojas, M.Large-Scale Control on the Patagonian ClimateJournal of Climate10.1175/JCLI-D-12-00001.1Regional sea-level change for Chile is considered until the end of the 21st century for the RCP4.5 and RCP8.5 scenarios. The main components that contribute to sea-level change are analyzed and summed to achieve a total estimate of sea-level change along the coast of Chile and in the Southeast Pacific. Included are the steric/dynamic component, the contribution from land ice loss and the sea- level change due to the glacial isostatic adjustment. Regional fingerprints and global means are combined to estimate sea-level change in this area. For the steric/dynamic component two different estimates are considered. The results are compared to those found in the IPCC AR5 report. The total mean sea-level rise along the coast lies between 34 cm and 52 cm for the RCP4.5 scenario and between 46 cm and 74 cm for the RCP8.5 scenario, depending on the location and the steric/dynamic component estimate considered. This component is the main contribution in each scenario. All estimates show a modest, relatively constant decrease in sea-level rise along the coast from north to south. is.1Thomson Reuters ISIair temperature, annual cycle, austral summers, downslope, environmental records, high latitudes, high-resolution numerical simulation, interannual time scale, large-scale circulation, local climate, main mode, meteorological station, near surface air temperature, patagonia, rainfall variability, reanalysis, remote regions, south america, varying temperature, wind anomalies, zonal flows, zonal wind, climatology, mathematical models, climate control, annual variation, atmospheric circulation, numerical model, precipitation (climatology), regional climate
Modelación y Sistemas de Observación2013Glasow, R. von, Jickells, T. D., Baklanov, A., Carmichael, G. R., Church, T. M., Gallardo, L., … Zhu, T.Megacities and Large Urban Agglomerations in the Coastal Zone: Interactions Between Atmosphere, Land, and Marine EcosystemsAMBIO10.1007/s13280-012-0343-9Cyanobacteria are widely distributed primary producers with significant implications for the global biogeochemical cycles of carbon and nitrogen. Diazotrophic cyanobacteria of subsection V (Order Stigonematales) are particularly ubiquitous in photoautotrophic microbial mats of hot springs. The Stigonematal cyanobacterium strain CHP1 isolated from the Porcelana hot spring (Chile) was one of the major contributors of the new nitrogen through nitrogen fixation. Further morphological and genetic characterization verified that the strain CHP1 belongs to Stigonematales, and it formed a separate clade together with other thermophiles of the genera Fischerella and Mastigocladus. Strain CHP1 fixed maximum N2 in the light, independent of the temperature range. At 50 °C nifH gene transcripts showed high expression during the light period, whereas the nifH gene expression at 45 °C was arrhythmic. The strain displayed a high affinity for nitrate and a low tolerance for high ammonium concentrations, whereas the narB and glnA genes showed higher expression in light and at the beginning of the dark phase. It is proposed that Mastigocladus sp. strain CHP1 would represent a good model for the study of subsection V thermophilic cyanobacteria, and for understanding the adaptations of these photoautotrophic organisms inhabiting microbial mats in hot springs globally. is.1Thomson Reuters ISIair pollution, coastal zone management, deposition, harmful algal blooms, marine pollution, ozone, agglomeration, algal bloom, atmospheric deposition, atmospheric pollution, ecosystem function, environmental management, health risk, heat island, marine ecosystem, megacity, sea breeze, socioeconomic status, topography, urban area, urban pollution, atmosphere, climate, ecosystem, eutrophication, greenhouse effect, marine biology, review, urbanization, water pollutant, water pollutants, algae
Modelación y Sistemas de Observación2013Joos, F., Roth, R., Fuglestvedt, J. S., Peters, G. P., Enting, I. G., von Bloh, W., Shaffer, G., … Weaver, A. J.Carbon dioxide and climate impulse response functions for the computation of greenhouse gas metrics: a multi-model analysisAtmospheric Chemistry and Physics10.5194/acp-13-2793-2013Cyanobacteria from Subsection V (Stigonematales) are important components of microbial mats in non-acidic terrestrial hot springs. Despite their diazotrophic nature (N2 fixers), their impact on the nitrogen cycle in such extreme ecosystems remains unknown. Here, we surveyed the identity and activity of diazotrophic cyanobacteria in the neutral hot spring of Porcelana (Northern Patagonia, Chile) during 2009 and 2011-2013. We used 16S rRNA and the nifH gene to analyze the distribution and diversity of diazotrophic cyanobacteria. Our results demonstrate the dominance of the heterocystous genus Mastigocladus (Stigonematales) along the entire temperature gradient of the hot spring (69-38 °C). In situ nitrogenase activity (acetylene reduction), nitrogen fixation rates (cellular uptake of (15)N2) and nifH transcription levels in the microbial mats showed that nitrogen fixation and nifH mRNA expression were light-dependent. Nitrogen fixation activities were detected at temperatures ranging from 58 °C to 46 °C, with maximum daily rates of 600 nmol C2H4 cm(-2) per day and 94.1 nmol N cm(-2) per day. These activity patterns strongly suggest a heterocystous cyanobacterial origin and reveal a correlation between nitrogenase activity and nifH gene expression during diurnal cycles in thermal microbial mats. N and C fixation in the mats contributed ∼3 g N m(-2) per year and 27 g C m(-2) per year, suggesting that these vital demands are fully met by the diazotrophic and photoautotrophic capacities of the cyanobacteria in the Porcelana hot spring. is.5Thomson Reuters ISIair temperature, carbon dioxide, carbon emission, climate modeling, global warming, greenhouse gas, uncertainty analysis
Servicios Ecosistémicos2013Labarca Encina, R., Pino, M., & Recabarren, O.Los Lamini (Cetartiodactyla: Camelidae) extintos del yacimiento de Pilauco (Norpatagonia chilena): aspectos taxonómicos y tafonómicos preliminaresEstudios Geologicos10.3989/egeol.40862.219Purpose: To confront the increasingly devastating impacts of disasters and the challenges that climate change is posing to disaster risk management (DRM) there is an imperative to further develop DRM. The resilience approach is emerging as one way to do this, and in the last decade has been strongly introduced into the policy arena, although it is not new for DRM practitioners and researchers. Nevertheless, resilience is a highly contested issue, and there is no agreed definition of it, which has resulted in confusion for stakeholders when applying it to practice. Therefore, the purpose of this paper is to investigate how resilience is framed by researchers and DRM practitioners. Design/methodology/approach: The analytical framework used was Hajer's "social-interactive discourse theory", combined with analysis of government documents, in-depth interviews with practitioners and observation of field and practices within the context of the Natural Disaster Resilience Program in Queensland, Australia. Findings: One of the key findings is that the idea of "bouncing back" is central to the resilience discourse but different interpretations of this idea results in real-world implications. Three different ways (storylines) in which practitioners construct the meaning of disaster resilience emerge from this study. Importantly the divergences between these storylines reveal possibilities for reframing to occur and these could lead to different policy options and practices. Originality/value: The results presented in this paper offer empirical evidence on how resilience is understood on the ground, contributing to extending resilience theory and informing DRM and resilience practice. © Emerald Group Publishing Limited. is.2Thomson Reuters ISIchile, lamini, late pleistocene, northern patagonia, taphonomy, bog, cladistics, flooding, fossil, fossil record, pleistocene, ungulate, patagonia
Servicios Ecosistémicos2013Molina-Montenegro, M. A., Ricote-Martínez, N., Muñoz-Ramírez, C., Gómez-González, S., Torres-Díaz, C., Salgado-Luarte, C., & Gianoli, E.Positive interactions between the lichen Usnea antarctica (Parmeliaceae) and the native flora in Maritime AntarcticaJournal of Vegetation Science10.1111/j.1654-1103.2012.01480.xThe resilience perspective has emerged as a plausible approach to confront the increasingly devastating impacts of disasters; and the challenges and uncertainty climate change poses through an expected rise in frequency and magnitude of hazards. Stakeholder participation is posited as pivotal for building resilience, and resilience is not passive; rather, stakeholders are actively involved in the process of building resilience. Who is involved and how they are involved are crucial aspects for developing resilience in practice. Nevertheless, there are few empirical studies available to inform theory or show how these issues are addressed. This study focuses on revealing how practitioners frame the issue of participation in relation to resilience, its relevance to a changing climate and how, in consequence, they construct practices. Using Hajer's [(1995). The politics of environmental discourse: Ecological modernization and the policy process. New York] ‘Social-interactive discourse theory’, in this... is.3Thomson Reuters ISIantarctica, deschampsia antarctica, facilitation, global warming, lichens, mosses, nurse effect, antarctic ecozone, grass, lichen, microclimate, moss, nurse plant, nutrient availability, soil moisture, species richness, temperature effect, king george island, south shetland islands, atra, bryophyta, deschampsia, parmeliaceae, usnea, usnea antarctica
Servicios Ecosistémicos2013Pino, M., Chávez-Hoffmeister, M., Navarro-Harris, X., & Labarca, R.The late Pleistocene Pilauco site, Osorno, south-central ChileQuaternary International10.1016/j.quaint.2012.05.001There is a growing use of resilience ideas within the disaster risk management literature and policy domain. However, few empirical studies have focused on how resilience ideas are conceptualized by practitioners, as they implement them in practice. Using Hajer's 'social-interactive discourse theory' this research contributes to the understanding of how practitioners frame, construct and make sense of resilience ideas in the context of changes in institutional arrangements for disaster risk management that explicitly include the resilience approach and climate change considerations. The case study involved the roll out of the Natural Disaster Resilience Program in Queensland, Australia, and the study involved three sites in Queensland. The methods used were observation of different activities and the physical sites, revision of documents related to the Natural Disaster Resilience Program and in-depth semi-structured interviews with key informants, all practitioners who had direct interaction with the program. The research findings show that practitioners construct the meaning of disaster resilience differently, and these are embedded in diverse storylines. Within these storylines, practitioners gave different interpretations and emphasis to the seven discourse categories that characterized their resilience discourse. Self-reliance emerged as one of the paramount discourse categories but we argue that caution needs to be used when promoting values of self-reliance. If the policy impetus is a focus on learning, research findings indicate it is also pertinent to move from experiential learning toward social learning. The results presented in this study provide helpful insights to inform policy design and implementation of resilience ideas in disaster risk management and climate change, and to inform theory. Reuters ISIarchaeological evidence, artifact, bone, coprolite, fossil, human settlement, lithic fragment, mammal, paleontology, pleistocene, radiocarbon dating, stratigraphy, taphonomy, tooth, volcaniclastic deposit, chile, los rios chile, monte verde, animalia, camelidae, cervidae, equidae, mammalia, mephitidae, muridae, myocastoridae, passiflora serratodigitata, vertebrata, xenarthra
Dinámica del Clima2013Power, M. J., Mayle, F. E., Bartlein, P. J., Marlon, J. R., Anderson, R. S., Behling, H., Moreno, P.I, … Walsh, M. K.Climatic control of the biomass-burning decline in the Americas after ad 1500The Holocene10.1177/0959683612450196Current debate on the implementation of resilience in addressing climatic impacts calls for more pragmatic means of reducing losses. In this study we aimed to generate context-specific knowledge about resilience factors for addressing the impacts of drought, with the expectation that bringing forth experiential knowledge on how impacts were addressed in the past would shed light on what constitutes key resilience factors for practitioners working in urban contexts. The study was carried in three of the largest cities in Chile: Santiago, Concepción, and Valdivia. The analytical framework consists of urban and regional resilience incorporating transdisciplinary approaches applying the Resilience-Wheel tool, combined with participatory methods for the co-production of knowledge and qualitative content analysis of documents and workshops. Results show that key determinants of building resilience to drought were: improving education and access to information, enhancing preparedness, promoting technology transfer, reinforcing organizational linkages and collaboration, decentralizing governance, and encouraging citizen participation. The Resilience-Wheel was useful for navigating the conceptual complexity and diversity of perspectives inherent among social actors. The transdisciplinary approach allowed us to co-produce key knowledge that can be applied to build resilience in future, through a bottom-up approach that bridges the science–policy interface. is.1Thomson Reuters ISI"little ice age", biomass burning, charcoal, climate, human population, indigenous population, little ice age, paleoclimate, population decline, proxy climate record, reconstruction, settlement history, spatial variation, temporal variation, north america, south america
Modelación y Sistemas de Observación2013Rojas, M.Sensitivity of Southern Hemisphere circulation to LGM and 4 × CO2 climatesGeophysical Research Letters10.1002/grl.50195There is growing recognition that routine climate change framing is insufficient for addressing the challenges presented by this change, and that different framings of climate change shape stakeholders' practices and guide policy options. This research investigated how stakeholders conceptualise climate change in terms of its seriousness and related uncertainty, and a resilience approach as a possible policy option to confront this uncertainty. An application of the conceptual framework provided by Handmer and Dovers' typology of emergencies is novel to the climate change field. Results show that there is a tendency to frame climate change as complex (with uncertainty representing part of that complexity) and to confront this complexity with less complex policies and solutions. No pattern of a conceptual link between uncertainty and resilience was observed. The results presented in this study offer empirical evidence to inform theory and provide helpful insights to inform policy design and practice. is.5Thomson Reuters ISIsouthern westerly winds, atmospheric circulation, climate change projections, last glacial maximum, meridional circulation, northern hemispheres, southern hemisphere circulation, surface temperature gradient, atmospheric temperature, carbon dioxide, climate change, computer simulation, boundary condition, simulation, southern hemisphere, wave modeling
Modelación y Sistemas de Observación2013Rojas, M., Li, L. Z., Kanakidou, M., Hatzianastassiou, N., Seze, G., & Treut, H. L.Winter weather regimes over the Mediterranean region: their role for the regional climate and projected changes in the twenty-first centuryClimate Dynamics10.1007/s00382-013-1823-8This paper explores the use of active and passive microwave satellite soil moisture products for improving streamflow prediction within four large (>5000km2) semiarid catchments in Australia. We use the probability distributed model (PDM) under a data-scarce scenario and aim at correcting two key controlling factors in the streamflow generation: the rainfall forcing data and the catchment wetness condition. The soil moisture analysis rainfall tool (SMART) is used to correct a near real-time satellite rainfall product (forcing correction scheme) and an ensemble Kalman filter is used to correct the PDM soil moisture state (state correction scheme). These two schemes are combined in a dual correction scheme and we assess the relative improvements of each. Our results demonstrate that the quality of the satellite rainfall product is improved by SMART during moderate-to-high daily rainfall events, which in turn leads to improved streamflow prediction during high flows. When employed individually, the soil moisture state correction scheme generally outperforms the rainfall correction scheme, especially for low flows. Overall, the combined dual correction scheme further improves the streamflow predictions (reduction in root mean square error and false alarm ratio, and increase in correlation coefficient and Nash-Sutcliffe efficiency). Our results provide new evidence of the value of satellite soil moisture observations within data-scarce regions. We also identify a number of challenges and limitations within the schemes. is.3Thomson Reuters ISIclimate change, coupled regional atmosphere-ocean simulation, mediterranean, winter weather regimes, air temperature, atmosphere-ocean coupling, climate modeling, climate prediction, cloud cover, geopotential, precipitation (climatology), regional climate, seasonal variation, twenty first century, weather forecasting, winter, mediterranean region, mediterranean sea, north africa, southern europe
Servicios Ecosistémicos2013Swanson, F. J., Jones, J. A., Crisafulli, C. M., & Lara, A.Effects of volcanic and hydrologic processes on forest vegetation: Chaitén Volcano, ChileAndean Geology10.5027/andgeoV40n2-a10Global warming is expected to enhance radial tree growth at alpine treeline sites worldwide. We developed a well-replicated tree-ring chronology from Nothofagus pumilio near treeline in a high precipitation climate on Choshuenco Volcano (40°S) in Chile to examine: (a) variation in tree radial growth in relation to interannual climatic variability; and (b) relationships of radial growth to variability in El Niño Southern Oscillation (ENSO) and the Antarctic Oscillation (AAO) at interannual and decadal time scales. A tree-ring chronology based on 99 tree-ring series from 80 N. pumilio trees near treeline showed a high series intercorrelation (0.48) indicating a strong common environmental signal. Radial growth is negatively correlated with precipitation in late spring (November-December). Temperature and tree growth are positively correlated during late spring and early summer (November-January). Interannual variability in both seasonal climate and in tree growth is strongly teleconnected to ENSO and AAO variability. Radial growth of N. pumilio in this humid high-elevation forest does not show a positive trend over the past half century as predicted from global treeline theory and broadscale warming in the Patagonian-Andean region. Instead, tree growth increased sharply from the 1960s to a peak in the early 1980s but subsequently declined for c. 30years to its lowest level in >100years. The shift to higher radial growth after c. 1976 coincides with a shift towards warmer sea surface temperatures in the tropical Pacific which in turn are associated with warmer growing season temperatures. The decline in tree growth since the mid-1990s is coincident with the increasingly positive phase of the AAO and high spring precipitation periods associated with El Niño conditions. The recent shift towards reduced growth of N. pumilio at this humid high-elevation site coincident with rising AAO mirrors the reduced tree growth beginning in the 1960s for trees growing in relatively xeric, lower elevation sites throughout the Patagonian-Andean region. The current study indicates that N. pumilio growth response in humid high-elevation environments to recent broad-scale warming has been non-linear, and that AAO and ENSO are key climatic forcings of tree growth variability. is.2Thomson Reuters ISIecological disturbance, environmental impacts, landscape ecology, natural resource impacts, vegetation response, disturbance, ecosystem response, environmental factor, forest cover, hydrological response, mass movement, mortality, pyroclastic flow, tephra, volcanic eruption, volcanology, chaiten volcano, chile, los lagos, southern volcanic zone
Modelación y Sistemas de Observación2013Zickfeld, K., Eby, M., Weaver, A. J., Alexander, K., Crespin, E., Edwards, N. R., Shaffer, G., … Zhao, F.Long-Term Climate Change Commitment and Reversibility: An EMIC IntercomparisonJournal of Climate10.1175/JCLI-D-12-00584.1In 2013, the international Commission on Atmospheric Chemistry and Global Pollution (iCACGP) and the International Global Atmospheric Chemistry (IGAC) Project Americas Working Group (iCACGP/IGAC AWG) was formed to build a cohesive network and foster the next generation of atmospheric scientists with the goal of contributing to a scientific community focused on building collective knowledge for the Americas. The Latin America–Caribbean (LAC) region shares common history, culture, and socioeconomic issues but, at the same time, it is highly diverse in its physical and human geography. The LAC region is unique because approximately 80% of its population lives in urban areas, resulting in high-density hotspots of urbanization and vast unpopulated rural areas. In recent years, most countries of the region have experienced rapid growth in population and industrialization as their economies emerge. The rapid urbanization, the associated increases in mobile and industrial sources, and the growth of the agricultural activities related to biomass burning have degraded air quality in certain areas of the LAC region. Air pollution has negative implications for human health, ecosystems, and climate. In addition, air pollution and the warming caused by greenhouse gases could impact the melting of Andean glaciers, an important source of freshwater. To better understand the links between air pollution and climate, it is necessary to increase the number of atmospheric scientists and improve our observational, analytical, and modeling capacities. This requires sustained and prioritized funding as well as stronger collaboration within the LAC region. is.16Thomson Reuters ISIclimate projection, intergovernmental panel on climate changes, intermediate complexity, meridional overturning circulations, pre-industrial levels, radiative forcings, surface air temperatures, thermosteric sea level, atmospheric composition, atmospheric radiation, atmospheric temperature, climate change, sea level, carbon dioxide, air temperature, intergovernmental panel on climate change, radiative forcing, sea level change
Dinámica del Clima2014Aguirre, C., Garreaud, R., & Rutllant, J. A.Surface ocean response to synoptic-scale variability in wind stress and heat fluxes off south-central ChileDynamics of Atmospheres and Oceans10.1016/j.dynatmoce.2013.11.001Our observational analysis shows that the wet seasons of the American monsoon systems have shortened since 1978 due to correlated earlier retreats of the North American monsoon (NAM) and late onsets of the southern Amazon wet season, an important part of the South American monsoon (SAM). These changes are related to the combination of the global sea surface temperature (SST) warming mode, the El Niño-Southern Oscillation (ENSO), the Atlantic Multidecadal Oscillation (AMO), the westward shift of the North Atlantic subtropical high (NASH), and the enhancement of Pacific South American and Pacific North American wave train patterns, which induces variations of the regional circulation at interannual and decadal scales. The joint contributions from these forcing factors are associated with a stronger and more equatorward regional Hadley cell, which enhances convergence towards the equator, strengthening and possibly delaying the retreat of the tropical part of the NAM. This in turn accelerates the demise of the northern NAM and delays the reversal of the cross-equatorial flow over South America, reducing moisture transport to the SAM and delaying its onset. In addition, the thermodynamic response to warming appears to cause local drier land conditions over both regions, reinforcing the observed changes in these monsoons. Although previous studies have identified the isolated influence of the regional Hadley cell, ENSO, AMO, global SST warming, and NASH on the NAM, the correlated changes between NAM and SAM through variations of the cross-equatorial flow had not been established before. Reuters ISIair-sea interaction, atmospheric forcing, surface currents, surface temperature, synoptic variability, chile, air sea interactions, surface current, surface temperatures, synoptic variability, atmospheric temperature, heat flux, wind stress, ocean currents, computer simulation, diffusivity, geostrophic flow, oceanic current, sea surface temperature, seasonal variation, synoptic meteorology, chile
Dinámica del Clima; Servicios Ecosistémicos2013Ahmed, M., Anchukaitis, K. J., Asrat, A., Borgaonkar, H. P., Christie, D.A., Lara, A., … Zorita, E.Continental-scale temperature variability during the past two millenniaNature Geoscience10.1038/NGEO1797From 18 to 27 March 2015, northern, central, and southern Chile experienced a series of extreme hydrometeorological events. First, the highest surface air temperature ever recorded in Santiago (with reliable records dating to 1877), 36.8°C at Quinta Normal, was measured at 15:47 local time on 20 March 2015. Immediately following this high heat event, an extreme precipitation event, with damaging streamflows from precipitation totals greater than 45 mm, occurred in the semiarid and hyperarid Atacama regions. Finally, concurrent with the heavy precipitation event, extremely warm temperatures were recorded throughout southern Chile. These events were examined from a synoptic perspective with the goal of identifying forcing mechanisms and potential interaction between each analysis which provides operational context by which to identify and predict similar events in the future. Primary findings were as follows: (1) record warm temperatures in central Chile resulted from anomalous lower troposphere ridging and easterly downslope flow, both of which developed in response to an anomalous midtroposphere ridge-trough pattern; (2) a cutoff low with anomalous heights near one standard deviation below normal slowly moved east and was steered ashore near 25°S by circulation around a very strong ridge (anomalies more than 3 standard deviations above normal) centered near 60°S; (3) anomalously high precipitable water content (20 mm above climatological norms) over the Peruvian Bight region was advected southward and eastward ahead of the cutoff low by low-level northwesterly flow, greatly enhancing observed precipitation over northern Chile. is.5Thomson Reuters ISI
Dimensión Humana2014Aldunce, P., Beilin, R., Handmer, J., & Howden, M.Framing disaster resilience: The implications of the diverse conceptualisations of “bouncing back”Disaster Prevention and Management10.1108/DPM-07-2013-0130This paper is a pioneering analysis of past climates in southern South America combining multiproxy reconstructions and the state-of-the-art CMIP5/PMIP3 paleoclimatic models to investigate the time evolution of regional climatic conditions from the Mid-Holocene (MH) to the present. This analysis allows a comparison between the impact of the long term climate variations associated with insolation changes and the more recent effects of anthropogenic forcing on the region. The PMIP3 multimodel experiments suggest that changes in precipitation over almost all southern South America between MH and pre-industrial (PI) times due to insolation variations are significantly larger than those between PI and the present, which are due to changes in greenhouse gas concentrations. Anthropogenic forcing has been particularly intense over western Patagonia inducing reduction of precipitation in summer, autumn and winter as a consequence of progressively weaker westerly winds over the region, which have moved further poleward, between ca. 35–55°S and have become stronger south of about 50°S. Orbital variations between the MH to the PI period increased insolation over southern South America during summer and autumn inducing warmer conditions in the PI, accentuated by the effect of anthropogenic forcing during the last century. On the other hand, changes in orbital parameters from the MH to the PI period reduced insolation during winter and spring inducing colder conditions, which have been reversed by the anthropogenic forcing. is.3Thomson Reuters ISI"bounce back", climate change, disaster risk management, disasters, framing, resilience
Biogeoquímica2013Daniel, I., DeGrandpre, M., & Farías, L.Greenhouse gas emissions from the Tubul-Raqui estuary (central Chile 36°S)Estuarine, Coastal and Shelf Science10.1016/j.ecss.2013.09.019Chapter 2. GLOBAL CLIMATE, Section 9. Monitoring global drought using the self-calibrating Palmer drought severity index. J. Osborn., J. Barichivich, I. Harris, G. van der Schrier, and P. D. Jones Reuters ISIco2, ch4 and n2o exchange, estuary off central chile, eutrophication, estuary, greenhouse gas, heterotrophy, metabolism, summer, tidal cycle, trophic status, upwelling, winter, chile
Biogeoquímica; Modelación y Sistemas de Observación2014Escribano, J., Gallardo, L., Rondanelli, R., & Choi, Y. S.Satellite Retrievals of Aerosol Optical Depth over a Subtropical Urban Area: The Role of Stratification and Surface ReflectanceAerosol and Air Quality Research10.4209/aaqr.2013.03.0082The vulnerability of Amazonian rainforest, and the ecological services it provides, depends on an adequate supply of dry-season water, either as precipitation or stored soil moisture. How the rain-bearing South American monsoon will evolve across the twenty-first century is thus a question of major interest. Extensive savanization, with its loss of forest carbon stock and uptake capacity, is an extreme although very uncertain scenario. We show that the contrasting rainfall projections simulated for Amazonia by 36 global climate models (GCMs) can be reproduced with empirical precipitation models, calibrated with historical GCM data as functions of the large-scale circulation. A set of these simple models was therefore calibrated with observations and used to constrain the GCM simulations. In agreement with the current hydrologic trends, the resulting projection towards the end of the twenty-first century is for a strengthening of the monsoon seasonal cycle, and a dry-season lengthening in southern Amazonia. With this approach, the increase in the area subjected to lengthy - savannah-prone - dry seasons is substantially larger than the GCM-simulated one. Our results confirm the dominant picture shown by the state-of-the-art GCMs, but suggest that the â € model democracy'view of these impacts can be significantly underestimated. is.3Thomson Reuters ISIaod, modis, particulate matter, surface reflectance, atmospheric aerosols, estimation, range finding, reflection, satellite imagery, size distribution, aerosol mass concentration, aerosol robotic networks, moderate resolution imaging spectroradiometer, temporal and spatial distribution, radiometers, aeronet, aerosol property, annual cycle, cirrus, concentration (composition), data set, seasonality, subtropical region, urban atmosphere, cape verde macaronesia, sao tiago
Biogeoquímica2013Farías, L., Faúndez, J., Fernández, C., Cornejo, M., Sanhueza, S., & Carrasco, C.Biological N2O fixation in the Eastern South Pacific Ocean and marine cyanobacterial cultures.PloS one10.1371/journal.pone.0063956Within large uncertainties in the precipitation response to greenhouse gas forcing, the Southeast Pacific drying stands out as a robust signature within climate models. A precipitation decline, of consistent direction but of larger amplitude than obtained in simulations with historical climate forcing, has been observed in central Chile since the late 1970s. To attribute the causes of this trend, we analyze local rain gauge data and contrast them to a large ensemble of both fully coupled and sea surface temperature-forced simulations. We show that in concomitance with large-scale circulation changes, the Pacific Decadal Oscillation explains about half of the precipitation trend observed in central Chile. The remaining fraction is unlikely to be driven exclusively by natural phenomena but rather consistent with the simulated regional effect of anthropogenic climate change. We particularly estimate that a quarter of the rainfall deficit affecting this region since 2010 is of anthropogenic origin. An increased persistence and recurrence of droughts in central Chile emerges then as a realistic scenario under the current socioeconomic pathway. is.5Thomson Reuters ISIchlorophyll a, dissolved oxygen, nitrous oxide, organic carbon, organic nitrogen, particulate organic nitrogen, unclassified drug, oxygen, article, bacterial strain, bacterium culture, chlorophyll content, coastal waters, concentration (parameters), controlled study, crocosphaera, cyanobacterium, denitrification, field experiment, heterotroph, marine bacterium, nitrogen fixation, nonhuman, pacific ocean, photoautotroph, sea surface waters, subtropics, synechococcus, trichodesmium, tropics, aquatic species, chile, kinetics, metabolism, nitrification, peru, aquatic organisms, cyanobacteria
Biogeoquímica2013Florez-Leiva, L., Damm, E., & Farías, L.Methane production induced by dimethylsulfide in surface water of an upwelling ecosystemProgress in Oceanography10.1016/j.pocean.2013.03.005In theory, building resilience is touted as one way to deal with climate change impacts; however, in practice, there is a need to examine how contexts influence the capacity of building resilience. A participatory process was carried out through workshops in regions affected by drought in Chile in 2014. The aim was to explore how resilience theory can be better applied and articulated into practice vis-á-vis participatory approaches that enrich the research process through the incorporation of co-produced. The results show that there are more differences in responses by type of actor than between regions, where issues of national interest, such as ‘education-information’ and ‘preparedness’, are highlighted over others. However, historically relevant local topics emerged as differentiators: decentralisation, and political will. This reinforces why special attention must be given to the different understandings in knowledge co-production processes. This study provides evidence and lessons on the importance of incorporating processes of the co-production of knowledge as a means to better articulate and transfer abstract concepts, such as resilience theory, into practice. Reuters ISIanaerobic metabolism, coastal upwelling, control treatments, dimethylsulfoniopropionate, methane production, potential mechanism, subsurface waters, wind driven upwelling, acetylene, ecosystems, lighting, metabolism, methane, surface waters, air-sea interaction, anoxic conditions, chlorophyll a, dimethylsulfide, ester, marine ecosystem, methanotrophy, surface water, upwelling, chile
Biogeoquímica2013Galbraith, E. D., Kienast, M., Albuquerque, A. L., Altabet, M. A., Batista, F., Bianchi, D., de Pol-Holz, R., … Terence Yang, J.-Y.The acceleration of oceanic denitrification during deglacial warmingNature Geoscience10.1038/ngeo1832Northern Chile hosts the driest place on Earth in the Atacama Desert. Nonetheless, an extreme precipitation event affected the region on 24-26 March 2015 with 1-day accumulated precipitation exceeding 40 mm in several locations and hourly mean rainfall rates higher than 10 mm h−1, producing floods and resulting in casualties and significant damage. The event is analyzed using ERA-Interim reanalysis, surface station data, sounding observations and satellite based radar. Two main conditions favorable for precipitation were present at the time of the event: (i) a cut-off low (COL) off the coast of Northern Chile and (ii) positive sea surface temperature (SST) anomalies over the eastern tropical Pacific. The circulation driven by the COL was strong but not extraordinary. A regional climate model (RegCM4) is used to test the sensitivity of precipitation to SST anomalies by removing the warm SST anomaly in the eastern tropical Pacific. The cooler simulation produced a very similar COL dry dynamics than that simulated in a control run (with observed SST), but, suppressed the precipitation by 60-80% over Northern Chile and 100% in parts of the Atacama Desert due to the decreased availability of precipitable water. The results indicate that the warm SST anomaly over eastern Pacific, favored by the onset of El Niño 2015-2016, was instrumental to the extreme precipitation event by providing an anomalous source of water vapor transported to Atacama by the circulation ahead of the COL. is.7Thomson Reuters ISIacceleration, bioavailability, biological production, continental shelf, deglaciation, denitrification, growth rate, holocene, last deglaciation, last glacial maximum, nitrogen cycle, sea surface, seafloor, sedimentary sequence
Dinámica del Clima2013Garreaud, R.Warm Winter Storms in Central ChileJournal of Hydrometeorology10.1175/JHM-D-12-0135.1The hydrological discharge (HD) model of Max Planck Institute for Meteorology is forced by a variety of climate model datasets to investigate the future of discharge in the Euphrates-Tigris Basin. The data include daily time series of surface runoff and sub-surface runoff outputs of 2 global climate models (GCMs) (the SRES A1B scenario simulation of ECHAM5/MPIOM and the RCP 4.5 scenario simulation of MPI-ESM-LR) and the dynamically downscaled outputs of ECHAM5/MPIOM and NCAR-CCSM3 scenario (SRES A1FI, A2 and B1) simulations. The suite of simulations enables a comprehensive analysis of the projected river discharge, and allows a comparison between CMIP5 simulations of MPI-ESM-LR and CMIP3 results from its predecessor ECHAM5/MPIOM on a basin scale. We demonstrate that HD simulations forced with relatively low-resolution GCM outputs are not good at reproducing the seasonal cycle of discharge, which is typically characterized by less flow in the peak season and an earlier peak in annual discharge. Simulations forced with the MPI-ESM-LR yield more robust information on the annual cycle and timing of the annual peak discharge than ECHAM5-forced simulations. In contrast to GCM-forced simulations, high-resolution RCM-forced simulations reproduce the annual cycle of discharge reasonably well; however, overestimation of discharge during the cold season and bias in the timing of springtime snowmelt peaks persist in the RCM-forced simulations. Different RCM-forced scenario simulations indicate substantial decreases in mean annual discharge for the Euphrates and Tigris Rivers by the end of the century, ranging from 19-58%. Significant temporal shifts to earlier days (3-5 wk by the end of the 21st century) in the center time of the discharges are also projected for these rivers. As the basin is considered water-stressed and the region is strongly influenced by water-scarcity events, these unfavorable changes may potentially increase water disputes among the basin countries. is.5Thomson Reuters ISIadvection, anticyclone, cold front, hydrometeorology, jet flow, moisture flux, precipitation (climatology), remote sensing, storm, winter, zonal flow, andes, chile
Dinámica del Clima2013Li, J., Xie, S.-P., Cook, E. R., Morales, M. S., Christie, D. A., Johnson, N. C., … Fang, K.El Niño modulations over the past seven centuriesNature Climate Change10.1038/nclimate1936This perspective paper reviews progress made in the last decades to enhance the communication and use of climate information relevant to the political and economic decision process. It focuses, specifically, on the creation and development of climate services, and highlights a number of difficulties that have limited the success of these services. Among them are the insufficient awareness by societal actors of their vulnerability to climate change, the lack of relevant products and services offered by the scientific community, the inappropriate format in which the information is provided, and the inadequate business model adopted by climate services. The authors suggest that, to be effective, centers should host within the same center a diversity of staff including experts in climate science, specialists in impact, adaptation and vulnerability, representatives of the corporate world, agents of the public service as well as social managers and communication specialists. The role and importance of environmental engineering is emphasized. is.9Thomson Reuters ISIclimate modeling, climate prediction, cooling, coral, dendrochronology, el nino, el nino-southern oscillation, global warming, holocene, northern hemisphere, paleoclimate, radiative forcing, reconstruction, teleconnection, tree ring, twentieth century, pacific ocean, pacific ocean (tropical)
Biogeoquímica2013Martínez-Méndez, G., Hebbeln, D., Mohtadi, M., Lamy, F., de Pol-Holz, R., Reyes-Macaya, D., & Freudenthal, T.Changes in the advection of Antarctic Intermediate Water to the northern Chilean coast during the last 970 kyrPaleoceanography10.1002/palo.20047Glacier behaviour during the mid-Holocene (MH, 6000 years BP) in the Southern Hemisphere provides observational data to constrain our understanding of the origin and propagation of palaeoclimate signals. In this study we examine the climatic forcing of glacier response in the MH by evaluating modelled glacier equilibrium line altitudes (ELAs) and climatic conditions during the MH compared with pre-industrial time (PI, year 1750). We focus on the middle latitudes of the Southern Hemisphere, specifically Patagonia and the South Island of New Zealand. Climate conditions for the MH were obtained from PMIP2 model simulations, which in turn were used to force a simple glacier mass balance model to simulate changes in ELA. In Patagonia, the models simulate colder conditions during the MH in austral summer (-0.2 °C), autumn (-0.5 °C), and winter (-0.4), and warmer temperatures (0.2 °C) during spring. In the Southern Alps the models show colder MH conditions in autumn (-0.7 °C) and winter (-0.4 °C), warmer conditions in spring (0.3 °C), and no significant change in summer temperature. Precipitation does not show significant changes but exhibits a seasonal shift, with less precipitation from April to September and more precipitation from October to April during the MH in both regions. The mass balance model simulates a climatic ELA that is 15-33 m lower during the MH compared with PI conditions. We suggest that the main causes of this difference are driven mainly by colder temperatures associated with the MH simulation. Differences in temperature have a dual effect on glacier mass balance: (i) less energy is available for ablation during summer and early autumn and (ii) lower temperatures cause more precipitation to fall as snow rather than rain in late autumn and winter, resulting in more accumulation and higher surface albedo. For these reasons, we postulate that the modelled ELA changes, although small, may help to explain larger glacier extents observed by 6000 years BP in South America and New Zealand. is.4Thomson Reuters ISIaaiw, advection changes, paleoceanography, advection, antarctic intermediate water, benthic environment, carbon isotope, deep water, depositional environment, interglacial, intermediate water, last glacial, last glacial maximum, overturn, sea level change, sediment core, stable isotope, chile, pacific coast chile, pacific coast south america
Dimensión Humana2014Mastrangelo, M. E., Weyland, F., Villarino, S. H., Barral, M. P., Nahuelhual, L., & Laterra, P.Concepts and methods for landscape multifunctionality and a unifying framework based on ecosystem servicesLandscape Ecology10.1007/s10980-013-9959-9A method to predict vascular plant richness using spectral and textural variables in a heterogeneous wetland is presented. Plant richness was measured at 44 sampling plots in a 16-ha anthropogenic peatland. Several spectral indices, first-order statistics (median and standard deviation), and second-order statistics [metrics of a gray-level co-occurrence matrix (GLCM)] were extracted from a Landsat 8 Operational Land Imager image and a Pleiades 1B image. We selected the most important variables for predicting richness using recursive feature elimination and then built a model using random forest regression. The final model was based on only two textural variables obtained from the GLCM and derived from the Landsat 8 image. An accurate predictive capability was reported ( R2=0.6; [Formula: see text]), highlighting the possibility of obtaining parsimonious models using textural variables. In addition, the results showed that the mid-resolution Landsat 8 image provided better predictors of richness than the high-resolution Pleiades image. This is the first study to generate a model for plant richness in a wetland ecosystem. is.2Thomson Reuters ISIecosystem functions, ecosystem service relationships, land-sharing, land-sparing, landscape planning, landscape services, spatial scales, stakeholder participation, synergy
Dinámica del Clima; Servicios Ecosistémicos2014Muñoz, A. A., Barichivich, J., Christie, D. A., Dorigo, W., Sauchyn, D., Lara, A., … González, M. E.Patterns and drivers of Araucaria araucana forest growth along a biophysical gradient in the northern Patagonian Andes: Linking tree rings with satellite observations of soil moisture: Patterns and drivers of Araucaria growthAustral Ecology10.1111/aec.12054Peatlands are a type of wetland characterized by the accumulation of organic matter, called peat, and are important carbon reservoirs. In areas with poor drainage, human-induced forest fires and logging can produce flooded conditions and organic matter accumulation, which generates an ecosystem called anthropogenic peatland. Productive management activities such as Sphagnum moss harvesting and livestock grazing take place there. Our hypothesis was that productive management has a strong impact on the aboveground C reservoir and increases the presence of exotic species. We established 44 sampling points in a 16-ha anthropogenic peatland on Chiloé Island, Chile, comparing productive and conservation types of managements. Carbon stocks, vegetation structure and composition variables were quantified. These variables were used to classify the ecosystem into microsites to analyze the different locations in the peatland. In addition, predictive models of aboveground carbon were created using Landsat 8 OLI and Pleiades images. The results revealed a carbon stock of 11.99 ± 0.77 kg C m−2, which is smaller than in natural peatlands, and showed a wide variability of conditions within the peatland itself. This variability, mainly expressed in aboveground carbon, produces microsites dominated by either shrubs, species of the genus Juncus or grasses. Productive management reduced accumulated carbon in the aboveground stock and in the woody debris. However, the strongest impact was found on the vegetation variables, with a decrease in total cover, cover of shrubs and herbaceous plants, and in vegetation height. There was also an increase in the richness and presence of exotic species. The spatial prediction of aboveground carbon yielded significant results using only spectral indices, showing also that the impact of productive management is not homogenous, being less intense in waterlogged areas. This study is the first to quantify carbon reservoirs in this type of ecosystem and to propose variables that can be used as indicators of the impact of human activities. is.2Thomson Reuters ISIdrought, patagonia, remote sensing, soil moisture, tree-ring, biophysics, coniferous tree, drought stress, growing season, growth rate, moisture content, rooting, tree ring, andes
Dimensión Humana2014Nahuelhual, L., Carmona, A., Aguayo, M., & Echeverría, C.Land use change and ecosystem services provision: a case study of recreation and ecotourism opportunities in southern ChileLandscape Ecology10.1007/s10980-013-9958-xUnderstanding the effects of climate on the growth of trees is important to project the response of forests to climate change. Dendrochronological analysis offers a “proxy” source for the effects of climatic variation on tree growth at different spatial and temporal scales. To examine influences of temperature and precipitation on radial growth of Pinus pseudostrobus and Abies religiosa, this study combines measurements of radial growth patterns of forest trees in the Monarch Butterfly Biosphere Reserve (MBBR) in central Mexico with temperature and precipitation variables from instrumental records. Dendrochronological samples were collected as cross sections and increment cores by using a chainsaw and increment borers, respectively. Total ring-width chronologies were developed for each site. Principal component analyses (PCA) were used to identify common temperature, precipitation and tree growth variation patterns. Correlation and response function analyses between chronologies and records of temperature and precipitation were used to evaluate the relation of climate variables on tree growth. The months during which tree growth was most strongly affected by precipitation were January, February and October from the previous year; only the temperature of September from the previous year affected the tree growth. In some chronologies, May’s average monthly maximum temperature was negatively correlated with tree growth. PCA and a comparison of PCA factor scores of climatic variables and chronologies showed no significant differences between northern, central or southern portions of the MBBR. Apparently, tree growth in the MBBR is reduced in years of low January–May precipitation combined with high summer (September of the previous year) temperatures, a scenario which is likely to occur as a consequence of global climate change. is.2Thomson Reuters ISIecosystem services mapping, forest fragmentation, landscape trajectories, recreation opportunities
Modelación y Sistemas de Observación2013Osses, A., Gallardo, L., & Faundez, T.Analysis and evolution of air quality monitoring networks using combined statistical information indexesTellus B: Chemical and Physical Meteorology10.3402/tellusb.v65i0.19822Strong accumulations of N2O at oxyclines are some of the most conspicuous features of the world’s oceans. However, the origin of these maxima, and the relative contribution of nitrification and denitrification in N2O cycling, remains unclear. In order to gain insight into the importance of denitrification and factors regulating N2O cycling at upper oxyclines in the eastern South Pacific, the production and consumption of N2O by denitrification were measured using a classical acetylene method under induced anoxia with the addition of an electron acceptor (nitrite) and donors (sodium acetate and glucose). The results indicated that decreased O2 clearly affected the ratio in which N2O is reduced to N2 at the midoxycline (∼40 m depth) and at the oxycline’s base (∼80 m depth). Under induced anoxia, higherN2Oproduction (fromNO− 2 toN2Oof 67.2 nM d−1) occurred at 40mdepth, with half of the total quantity being consumed by denitrification (from N2OtoN2 of 32 nM d−1); conversely,100%of theN2Owas reduced toN2 at 80mdepth. In comparison with previously reported results at the base of the oxycline at an offshore station, the addition ofNO− 2 (as sodium nitrite) along with dissolved organic carbon (as sodium acetate and glucose) doubled the net N2O production by denitrification (∼20 nM d−1). Our results suggest that decreasing O2 levels along with an increased availability of NO− 2 and organic compounds in the upper oxycline may impact the N2O/N2 ratio and, therefore, the N2O efflux to the atmosphere is.1Thomson Reuters ISIair quality monitoring, information theory, optimal network design, santiago de chile
Dinámica del Clima2014Rahn, D. A., & Garreaud, R.A synoptic climatology of the near-surface wind along the west coast of South AmericaInternational Journal of Climatology10.1002/joc.3724The nosZ gene, which encodes for N2 O reduction to N2 , was used to study the structure of denitrifying communities in the oxygen minimum zone off Chilean and Peruvian coast throughout terminal restriction fragment length polymorphism (TRFLP) and cloning of nosZ genes. TRFLP analysis showed little diversity of nosZ genes at suboxic depths (Oxygen Minimum Zone´s core) compared with depths where O2 largely varied (upper limit of OMZ or ULOMZ). The nosZ-denitrifying communities showed differences in its structure between geographical locations and time sampling suggesting an association with the shift in the environmental conditions. The canonical correspondence analysis showed that the environmental parameters selected as predictor variables (N2 O, O2 , NH4 + and NO2 -) explained well the differences in nosZ-denitrifying community composition among sampling sites. The phylogenetic analysis showed little nosZ sequence diversity and grouped 81% of nosZ-clones near the cluster of sediments sequences from Pacific. Our sequences did not branch with any known denitrifying bacteria or seawater nosZ-sequences available, demonstrating the novelty of phylotypes founded in this area. is.3Thomson Reuters ISIcoastal wind, eastern boundary upwelling system, south america, synoptic climatology, coastal upwelling, coastal winds, in-situ observations, near-surface winds, synoptic evolution, upwelling systems, coastal engineering, normal distribution, storms, climatology, anticyclone, cyclone, synoptic meteorology, upwelling, wind, chile, peru
Dimensión Humana2013Romero-Lankao, P., Hughes, S., Rosas-Huerta, A., Borquez, R., & Gnatz, D. M.Institutional Capacity for Climate Change Responses: An Examination of Construction and Pathways in Mexico City and SantiagoEnvironment and Planning C: Government and Policy10.1068/c12173The Atacama Desert has been pointed out as one of the places on earth where the highest surface irradiance may occur. This area is characterized by its high altitude, prevalent cloudless conditions and relatively low columns of ozone and water vapor. Aimed at the characterization of the solar spectrum in the Atacama Desert, we carried out in February-March 2015 ground-based measurements of the spectral irradiance (from the ultraviolet to the near infrared) at seven locations that ranged from the city of Antofagasta (on the southern pacific coastline) to the Chajnantor Plateau (5,100 m altitude). Our spectral measurements allowed us to retrieve the total ozone column, the precipitable water, and the aerosol properties at each location. We found that changes in these parameters, as well as the shorter optical path length at high-altitude locations, lead to significant increases in the surface irradiance with the altitude. Our measurements show that, in the range 0–5100 m altitude, surface irradiance increases with the altitude by about 27% in the infrared range, 6% in the visible range, and 20% in the ultraviolet range. Spectral measurements carried out at the Izaña Observatory (Tenerife, Spain), in Hannover (Germany) and in Santiago (Chile), were used for further comparisons. is.5Thomson Reuters ISIclimate change responses, institutional capacity, latin america, urban, asymmetric information, climate change, decision making, political economy, urban climate, urban planning, chile, federal district mexico, metropolitana, mexico north america, mexico city
Dinámica del Clima2013Rutllant, J., Muñoz, R. C., & Garreaud, R.Meteorological observations on the northern Chilean coast during VOCALS-RExAtmospheric Chemistry and Physics10.5194/acp-13-3409-2013Urban pollution can often impact surrounding, non-urban regions, through advection and dispersal of pollutants by the prevailing winds. Urban regions located upstream of high mountains, such as the Andes, can potentially impact the cryosphere by deposition of particles onto the surface of the snowpack and glaciers. Santiago, the capital of Chile, has more than 6 million inhabitants and regularly experiences episodes of severe pollution, particularly during the austral winter. Some studies have hypothesized that particle pollution from Santiago can reach the cryosphere downwind of the city, but the scarcity of measurements made high in the mountains prevents the validation of mesoscale models so the proof of actual impact remains elusive. A research project was designed to provide some insight into this question. The Pollution Impact on Snow in the Cordillera - Experiments and Simulations (PISCES) project was carried out in 2014 and includes both observational and modeling components. A five-week field campaign was conducted at the end of winter, at an elevated site in a mountain valley, 65 km to the southeast of the center of Santiago, to characterize some aspects of particulate pollution. During synoptic conditions that result in clear days at the site, the mesoscale mountain-valley circulation is effective in transporting pollutants upwards during the day, leading to diluted particle concentrations beyond the summits of the highest peaks. Cloudy days with reduced up-valley circulation do not show increased concentrations associated with transport. Back trajectories indicate that airmasses reaching the site during the field campaign are seldom influenced by pollution from Santiago. is.6Thomson Reuters ISIatmospheric circulation, boundary layer, coastal zone, cooling, diurnal variation, heating, land breeze, marine atmosphere, meteorology, sea breeze, sea level pressure, stratocumulus, zonal wind, andes, chile, iquique, tarapaca
Biogeoquímica2013Seguel, R. J., Mancilla, C. A., Rondanelli, R., Leiva, M. A., & Morales, R. G. E.Ozone distribution in the lower troposphere over complex terrain in Central ChileJournal of Geophysical Research: Atmospheres10.1002/jgrd.50293Mesoscale eddies are important, frequent, and persistent features of the circulation in the eastern South Pacific (ESP) Ocean, transporting physical, chemical and biological properties from the productive shelves to the open ocean. Some of these eddies exhibit subsurface hypoxic or suboxic conditions and may serve as important hotspots for nitrogen loss, but little is known about oxygen consumption rates and nitrogen transformation processes associated with these eddies. In the austral fall of 2011, during the Tara Oceans expedition, an intrathermocline, anticyclonic, mesoscale eddy with a suboxic (< 2 µmol kg−1 of O2), subsurface layer (200–400 m) was detected  ∼  900 km off the Chilean shore (30° S, 81° W). The core of the eddy's suboxic layer had a temperature-salinity signature characteristic of Equatorial Subsurface Water (ESSW) that at this latitude is normally restricted to an area near the coast. Measurements of nitrogen species within the eddy revealed undersaturation (below 44 %) of nitrous oxide (N2O) and nitrite accumulation (> 0.5 µM), suggesting that active denitrification occurred in this water mass. Using satellite altimetry, we were able to track the eddy back to its region of formation on the coast of central Chile (36.1° S, 74.6° W). Field studies conducted in Chilean shelf waters close to the time of eddy formation provided estimates of initial O2 and N2O concentrations of the ESSW source water in the eddy. By the time of its offshore sighting, concentrations of both O2 and N2O in the subsurface oxygen minimum zone (OMZ) of the eddy were lower than concentrations in surrounding water and “source water” on the shelf, indicating that these chemical species were consumed as the eddy moved offshore. Estimates of apparent oxygen utilization rates at the OMZ of the eddy ranged from 0.29 to 44 nmol L−1 d−1 and the rate of N2O consumption was 3.92 nmol L−1 d−1. These results show that mesoscale eddies affect open-ocean biogeochemistry in the ESP not only by transporting physical and chemical properties from the coast to the ocean interior but also during advection, local biological consumption of oxygen within an eddy further generates conditions favorable to denitrification and loss of fixed nitrogen from the system. is.7Thomson Reuters ISIair pollution, landforms, meteorological instruments, ozone, complex topographies, horizontal gradients, local environments, ozone concentration, ozone mixing ratio, photochemical pollution, southern california, surface observation, ozone layer, atmospheric chemistry, atmospheric pollution, boundary layer, complex terrain, concentration (composition), mixed layer, mixing ratio, nitrogen oxides, photochemistry, pollutant transport, troposphere, volatile organic compound, aconcagua valley, chile, metropolitana, valparaiso chile
Biogeoquímica2013Siani, G., Michel, E., de Pol-Holz, R., Devries, T., Lamy, F., Carel, M., … Lourantou, A.Carbon isotope records reveal precise timing of enhanced Southern Ocean upwelling during the last deglaciationNature Communications10.1038/ncomms3758Nitrous oxide (N2O) is a trace gas affecting atmospheric radiative forcing through its greenhouse effect in the troposphere and destroying the ozone in the stratosphere. The oceans account for one-third of the global atmospheric N2O emissions, in which they are primarily cycled by nitrification and denitrification, with high N2O production in the subsurface waters. The surface waters are generally reported to be in equilibrium or slightly supersaturated with respect to the atmosphere. However, surface N2O sub-saturations have been observed in several regions of the world's oceans, such as off south-central Chile, which is bathed by the Sub-Antarctic Water Mass (SAAW), where N2O subsaturations as low as 35% have been registered during the austral spring and summer. An analysis of the mechanisms driving such surface N2O subsaturations (physical or biological) showed that physical mechanisms were not responsible for the high surface N2O deficit. In contrast, in situ potential experiments in surface waters with 15N2O addition showed an active biological N2O fixation (between 0.43 and 87.34nmol/L/d), with the highest N2O fixation rates associated with the SAAW (25.25-25.75kg/m3).Additionally, incubation experiments with 15N2O in surface water samples from one oceanic station showed high 15N-POM enrichment (0.44‰) and an inhibition of 15N-POM enrichment when an additional nitrogen source was added (NO2 - and NH4 +). These results suggest the existence of a mechanism able to use several nitrogen sources, including N2O. Molecular analyses (16S rRNA gene) from these experiments showed the presence of three major groups of bacteria: Gammaproteobacteria, Flavobacteria and Cyanobacteria, with Synechococcus sp. being the dominant group in the culture. However, the analysis of the nifH gene showed a taxonomic affiliation to the order Stigonematales associated with Mastigocladus sp. and Fischerella sp. and the order Oscillatoriales associated with Trichodesmium sp.Finally, the oceanic region exhibiting surface N2O subsaturations acts as a sink for atmospheric N2O, consuming ∼11.4 Gg of N2O in a six-month period. The N2O levels in the sink are 75% higher than those of the reported N2O source from the coastal band. The balance between the oceanic region and the coastal band results in a sink region of 4.94 Gg of N2O during this period. Reuters ISIcarbon 13, carbon 14, benthos, carbon cycle, carbon dioxide, carbon isotope, foraminifera, last deglaciation, oceanic circulation, terrestrial ecosystem, article, benthic foraminifera, climate, deglaciation, holocene, oscillation, oxygen concentration, planktonic foraminifera, sea, surface property, volcanic ash, southern ocean
Dimensión Humana2015Aldunce, P., Beilin, R., Howden, M., & Handmer, J.Resilience for disaster risk management in a changing climate: Practitioners’ frames and practicesGlobal Environmental Change10.1016/j.gloenvcha.2014.10.010Climate change is becoming an increasing threat to biodiversity. Consequently, methods for delineation, establishment and management of protected areas must consider the species' future distribution in response to future climate conditions. Biodiversity in high altitude semiarid regions may be particularly threatened by future climate change. In this study we assess the main environmental variables that best explain present day presence of the world's highest elevation woodlands in the South American Altiplano, and model how climate change may affect the future distribution of this unique ecosystem under different climate change scenarios. These woodlands are dominated by Polylepis tarapacana (Rosaceae), a species that forms unique biological communities with important conservation value. Our results indicate that five environmental variables are responsible for 91% and 90.3% of the present and future P. tarapacana distribution models respectively, and suggest that at the end of the 21st century, there will be a significant reduction (56%) in the potential habitat for this species due to more arid conditions. Since it is predicted that P. tarapacana's potential distribution will be severely reduced in the future, we propose a new network of national protected areas across this species distribution range in order to insure the future conservation of this unique ecosystem. Based on an extensive literature review we identify research topics and recommendations for on-ground conservation and management of P. tarapacana woodlands. Reuters ISIclimate change, disaster risk management, resilience discourse, self-reliance, social learning, disaster management, management practice, natural disaster, policy implementation, self assessment, social participation, australia, queensland
Dimensión Humana2016Aldunce, P., Handmer, J., Beilin, R., & Howden, M.Is climate change framed as 'business as usual or as a challenging issue? The practitioners dilemmaEnvironment and Planning C: Government and Policy10.1177/0263774X15614734The Tubul-Raqui estuary is a coastal system off central Chile at 37°S, adjacent to an active coastal upwelling area, which undergoes rapid changes associated with natural and anthropogenic perturbations. Biogenic greenhouse gas cycling and the gas saturation levels are good indicators of microbial metabolism and trophic status in estuaries. The dissolved greenhouse gases CO2, CH4 and N2O and other biological and chemical variables were spatially recorded in this estuary over two seasons (summer and winter) and over one-half of one tidal cycle. Tidal and spatial variability of these gases indicated they had different origins within the system. Surface waters were always oversaturated in CO2 (up to 578%) and CH4 (up to 6200%) with respect to the atmosphere. But while CO2 seems to come from marine and in situ metabolism, CH4 appears to be more influenced by fluvial and adjacent salt marsh areas. In contrast, N2O was mostly undersaturated and sediments seem to be largely responsible for its consumption. Strong seasonal variability was also observed in CO2 and CH4 fluxes, being tenfold (from-319 to 714mmolm-2d-1) and fivefold (from 0.33 to 2.5mmolm-2d-1) higher, respectively, in the austral summer compared to winter. In contrast, only small seasonal differences in N2O fluxes were found ranging from -59 to 28 μmol m-2 d-1. These temporal patterns can be explained not only in terms of hydrological and nutrient balances within the system, but also by the influence of wind-driven upwelling processes. Additionally, potential effects of changes in nutrient load and freshwater discharge on net ecosystem metabolism (i.e., autotrophy or heterotrophy) and therefore, on the production/removal of greenhouse gases in this system were explored. © 2013 Elsevier Ltd. is.5Thomson Reuters ISIclimate change, complexity, disaster management, framing, resilience, uncertainty, conceptual framework, environmental planning, environmental policy, policy making, stakeholder
Modelación y Sistemas de Observación2015Bozkurt, D., Sen, O., & Hagemann, S.Projected river discharge in the Euphrates-Tigris Basin from a hydrological discharge model forced with RCM and GCM outputsClimate Research10.3354/cr01268The biogeochemical cycles of carbon (C), nitrogen (N) and phosphorus (P) are interlinked by primary production, respiration and decomposition in terrestrial ecosystems1. It has been suggested that the C, N and P cycles could become uncoupled under rapid climate change because of the different degrees of control exerted on the supply of these elements by biological and geochemical processes1, 2, 3, 4, 5. Climatic controls on biogeochemical cycles are particularly relevant in arid, semi-arid and dry sub-humid ecosystems (drylands) because their biological activity is mainly driven by water availability6, 7, 8. The increase in aridity predicted for the twenty-first century in many drylands worldwide9, 10, 11 may therefore threaten the balance between these cycles, differentially affecting the availability of essential nutrients12, 13, 14. Here we evaluate how aridity affects the balance between C, N and P in soils collected from 224 dryland sites from all continents except Antarctica. We find a negative effect of aridity on the concentration of soil organic C and total N, but a positive effect on the concentration of inorganic P. Aridity is negatively related to plant cover, which may favour the dominance of physical processes such as rock weathering, a major source of P to ecosystems, over biological processes that provide more C and N, such as litter decomposition12, 13, 14. Our findings suggest that any predicted increase in aridity with climate change will probably reduce the concentrations of N and C in global drylands, but increase that of P. These changes would uncouple the C, N and P cycles in drylands and could negatively affect the provision of key services provided by these ecosystems. is.2Thomson Reuters ISIclimate change, dynamical downscaling, middle east, regional climate modeling, river discharge, climate modeling, data set, dispute resolution, general circulation model, meteorology, runoff, simulation, snowmelt, subsurface flow, time series, euphrates basin, tigris basin
Biogeoquímica2015Cornejo, M., Murillo, A. A., & Farías, L.An unaccounted for N2O sink in the surface water of the eastern subtropical South Pacific: Physical versus biological mechanismsProgress in Oceanography10.1016/j.pocean.2014.12.016Aims Climate and human impacts are changing the nitrogen (N) inputs and losses in terrestrial ecosystems. However, it is largely unknown how these two major drivers of global change will simultaneously influence the N cycle in drylands, the largest terrestrial biome on the planet. We conducted a global observational study to evaluate how aridity and human impacts, together with biotic and abiotic factors, affect key soil variables of the N cycle. Location Two hundred and twenty-four dryland sites from all continents except Antarctica widely differing in their environmental conditions and human influence. Methods Using a standardized field survey, we measured aridity, human impacts (i.e. proxies of land uses and air pollution), key biophysical variables (i.e. soil pH and texture and total plant cover) and six important variables related to N cycling in soils: total N, organic N, ammonium, nitrate, dissolved organic:inorganic N and N mineralization rates. We used structural equation modelling to assess the direct and indirect effects of aridity, human impacts and key biophysical variables on the N cycle. Results Human impacts increased the concentration of total N, while aridity reduced it. The effects of aridity and human impacts on the N cycle were spatially disconnected, which may favour scarcity of N in the most arid areas and promote its accumulation in the least arid areas. Main conclusions We found that increasing aridity and anthropogenic pressure are spatially disconnected in drylands. This implies that while places with low aridity and high human impact accumulate N, most arid sites with the lowest human impacts lose N. Our analyses also provide evidence that both increasing aridity and human impacts may enhance the relative dominance of inorganic N in dryland soils, having a negative impact on key functions and services provided by these ecosystems. Reuters ISIatmospheric radiation, genes, greenhouse effect, nitrogen, nitrogen fixation, nitrogen oxides, oceanography, rna, biological mechanisms, gammaproteobacteria, molecular analysis, nitrification and denitrification, nitrogen sources, physical mechanism, radiative forcings, subsurface waters, surface waters, atmospheric pollution, bacterium, marine atmosphere, nitrous oxide, ozone, radiative forcing, stratosphere, subantarctic intermediate water, supersaturation, surface water, trace gas, troposphere, chile, cyanobacteria, fischerella sp., flavobacteria, mastigocladus sp., oscillatoriales, stigonematales, synechococcus sp., trichodesmium
Biogeoquímica2015Farías, L., Florez-Leiva, L., Besoain, V., Sarthou, G., & Fernández, C.Dissolved greenhouse gases (nitrous oxide and methane) associated with the naturally iron-fertilized Kerguelen region (KEOPS 2 cruise) in the Southern OceanBiogeosciences10.5194/bg-12-1925-2015In the last decades, forest fires have been a concern in different regions of the world, especially by increased occurrences product of human activities and climate changes. In this study the spatio-temporal trends in the occurrence and area affected by fire in the Maule region during the period 1986-2012 were examined. We use the Corporación Nacional Forestal fire database, whose records were spatially represented by a grid of 2x2 km. The occurrence was stable during the analyzed period with an average of 378 events per year. The burned area presented three periods above average with 5.273 hectares per year. Most of the fires affected surfaces of less than 5 hectares, while a very small number of events explain most of the area annually burned in the region. According to the startup fuel, we found an increasing number of events initiated in forest plantations in contrast to the decreasing number of fires originated in the native forests. Causes of fires associated with transit and transportation were the most important. The number of events accidentally caused by burning waste significantly increased in the period studied. Most of the fires occurred in the coastal area and the central valley, strongly associated with the road network and the most populated cities. This work represents an important contribution to the characterization of forest fires in the region of Maule, being the first to represent the fire statistics in Chile in a spatially explicit way. is.6Thomson Reuters ISIair-sea interaction, algal bloom, chlorophyll a, concentration (composition), cruise report, dissolved gas, greenhouse gas, iron, mesoscale meteorology, microbial activity, phytoplankton, polar front, source-sink dynamics, spatiotemporal analysis, transect, water mass, french southern territories, kerguelen, kerguelen islands
Dinámica del Clima2014Flores, F., Garreaud, R., & Muñoz, R. C.OpenFOAM applied to the CFD simulation of turbulent buoyant atmospheric flows and pollutant dispersion inside large open pit mines under intense insolationComputers & Fluids10.1016/j.compfluid.2013.11.012Unicellular cyanobacteria are ubiquitous photoautotrophic microbes that contribute substantially to global primary production. Picocyanobacteria such as Synechococcus and Prochlorococcus depend on chlorophyll a-binding protein complexes to capture light energy. In addition, Synechococcus has accessory pigments organized into phycobilisomes, and Prochlorococcus contains chlorophyll b . Across a surface water transect spanning the sparsely studied tropical Indian Ocean, we examined Synechococcus and Prochlorococcus occurrence, taxonomy and habitat preference in an evolutionary context. Shotgun sequencing of size fractionated microbial communities from 0.1 μm to 20 μm and subsequent phylogenetic analysis indicated that cyanobacteria account for up to 15% of annotated reads, with the genera Prochlorococcus and Synechococcus comprising 90% of the cyanobacterial reads, even in the largest size fraction (3.0–20 mm). Phylogenetic analyses of cyanobacterial light-harvesting genes (chl-binding pcb/isi A, allophycocyanin ( apc AB), phycocyanin ( cpc AB) and phycoerythin ( cpe AB)) mostly identified picocyanobacteria clades comprised of overlapping sequences obtained from Indian Ocean, Atlantic and/or Pacific Oceans samples. Habitat reconstructions coupled with phylogenetic analysis of the Indian Ocean samples suggested that large Synechococcus -like ancestors in coastal waters expanded their ecological niche towards open oligotrophic waters in the Indian Ocean through lineage diversification and associated streamlining of genomes ( e . g . loss of phycobilisomes and acquisition of Chl b ); resulting in contemporary small celled Prochlorococcus . Comparative metagenomic analysis with picocyanobacteria populations in other oceans suggests that this evolutionary scenario may be globally important. Reuters ISIcfd, chuquicamata, les, open pits, openfoam, complex topographies, large open-pit mines, open pit, particular condition, pollutant dispersions, air, aspect ratio, buoyancy, incident solar radiation, open pit mining, topography, turbulence, computational fluid dynamics
Biogeoquímica2014Galán, A., Faúndez, J., Thamdrup, B., Santibáñez, J. F., & Farías, L.Temporal dynamics of nitrogen loss in the coastal upwelling ecosystem off central Chile: Evidence of autotrophic denitrification through sulfide oxidationLimnology and Oceanography10.4319/lo.2014.59.6.1865Both historical and idealized climate model experiments are performed with a variety of Earth system models of intermediate complexity (EMICs) as part of a community contribution to the Intergovernmental Panel on Climate Change Fifth Assessment Report. Historical simulations start at 850 CE and continue through to 2005. The standard simulations include changes in forcing from solar luminosity, Earth's orbital configuration, CO2, additional greenhouse gases, land use, and sulphate and volcanic aerosols. In spite of very different modelled pre-industrial global surface air temperatures, overall 20th century trends in surface air temperature and carbon uptake are reasonably well simulated when compared to observed trends. Land carbon fluxes show much more variation between models than ocean carbon fluxes, and recent land fluxes appear to be slightly underestimated. It is possible that recent modelled climate trends or climate-carbon feedbacks are overestimated resulting in too much land carbon loss or that carbon uptake due to CO2 and/or nitrogen fertilization is underestimated. Several one thousand year long, idealized, 2 × and 4 × CO2 experiments are used to quantify standard model characteristics, including transient and equilibrium climate sensitivities, and climate-carbon feedbacks. The values from EMICs generally fall within the range given by general circulation models. Seven additional historical simulations, each including a single specified forcing, are used to assess the contributions of different climate forcings to the overall climate and carbon cycle response. The response of surface air temperature is the linear sum of the individual forcings, while the carbon cycle response shows a non-linear interaction between land-use change and CO2 forcings for some models. Finally, the preindustrial portions of the last millennium simulations are used to assess historical model carbon-climate feedbacks. Given the specified forcing, there is a tendency for the EMICs to underestimate the drop in surface air temperature and CO2 between the Medieval Climate Anomaly and the Little Ice Age estimated from palaeoclimate reconstructions. This in turn could be a result of unforced variability within the climate system, uncertainty in the reconstructions of temperature and CO2, errors in the reconstructions of forcing used to drive the models, or the incomplete representation of certain processes within the models. Given the forcing datasets used in this study, the models calculate significant land-use emissions over the pre-industrial period. This implies that land-use emissions might need to be taken into account, when making estimates of climate-carbon feedbacks from palaeoclimate reconstructions. is.6Thomson Reuters ISI-
Dinámica del Clima2014Garreaud, R., Gabriela Nicora, M., Bürgesser, R. E., & Ávila, E. E.Lightning in Western PatagoniaJournal of Geophysical Research: Atmospheres10.1002/2013JD021160The emission of mineral dust aerosols in arid and semiarid regions is a complex process whose representation in atmospheric models remains crude, due to insufficient knowledge about the aerosol lifting process itself, the lack of global data on soil characteristics, and the impossibility for the models to resolve the fine-scale variability in the wind field that drives some of the dust events. As a result, there are large uncertainties in the total emission flux of mineral dust, its natural variability at various timescales, and the possible contribution from anthropogenic land use changes. This work aims for estimating dust emissions and reduces their uncertainty over the Sahara desert and the Arabian Peninsula—the largest dust source region of the globe. We use a data assimilation approach to constrain dust emission fluxes at a monthly resolution for 18 subregions. The Moderate Resolution Imaging Spectroradiometer satellite-derived aerosol optical depth is assimilated in a regional configuration of a general circulation model coupled to an aerosol model. We describe this data assimilation system and apply it for 1 year, resulting in a total mineral dust emissions flux estimate of 2900 Tg yr−1 over the Sahara desert and the Arabian Peninsula for the year 2006. The analysis field of aerosol optical depth shows an improved fit relative to independent Aerosol Robotic Network measurements as compared to the model prior field. is.8Thomson Reuters ISIsatellite imagery, storms, andes, atmospheric reanalysis, lightning activity, lightning location, maritime climate, patagonia, shallow convection, temporal variability, lightning, cooling, precipitation (climatology), spatial distribution, spatiotemporal analysis, stroke, synoptic meteorology, topography, andenes, andoya, chile, norway, vesteralen
Biogeoquímica2015Gayo, E. M., Latorre, C., & Santoro, C. M.Timing of occupation and regional settlement patterns revealed by time-series analyses of an archaeological radiocarbon database for the South-Central Andes (16°-25°S)Quaternary International10.1016/j.quaint.2014.09.076We explore the relationship between satellite retrievals of aerosol optical depth (AOD) and surface aerosol mass concentrations over a subtropical urban area, namely, Santiago, Chile (33.5°S, 70.6°W, 500 m.a.s.l.). We compare 11 years of AOD from the MODerate resolution Imaging Spectroradiometer (MODIS) with in situ particulate matter mass concentrations (PM). MODIS AOD reaches its maximum in summer and minimum in winter, the opposite of the annual cycle of surface PM. To improve our understanding of the relevant governing processes, we use a simple model that estimates the boundary layer (BL) AOD based on measured PM, relative humidity and BL height (BLH) as well as best estimates of aerosol composition, size distribution, and optical properties. Model results indicate that a weak annual AOD cycle is due to the opposite annual cycles in BLH and PM, which is largely supported by the Aerosol Robotic NETwork (AERONET) data collected in 2001 and 2002 in Santiago. We identify a possible bias linked to the operational estimate of surface reflectance that may lead to a spurious summer maximum in MODIS AOD over Santiago. This misfit in surface reflectance appears to affect not only Santiago but also a significant area of the semi-arid Southern South America. Sensitivity experiments with the simple model indicate an underestimate of simulated AOD as compared to AERONET data. This underestimate points to the possible role of residual aerosol layers in the AOD measured at the surface (not included in the simple model). Cirrus clouds appear not to play a significant role in explaining the MODIS AOD seasonality. The need for improved characterizations of aerosol properties and their temporal and spatial distribution in cities such as Santiago is emphasized. Reuters ISIatacama desert, central andes, palaeodemography, summed probabilities, time-series, archaeological evidence, bioclimatology, database, demographic history, geochronology, human settlement, population distribution, prehistoric, radiocarbon dating, settlement pattern, time series analysis, altiplano, andes, chile
Modelación y Sistemas de Observación2014Huneeus, N., Boucher, O., Alterskjaer, K., Cole, J. N. S., Curry, C. L., Ji, D., … Yoon, J.-H.Forcings and feedbacks in the GeoMIP ensemble for a reduction in solar irradiance and increase in CO 2Journal of Geophysical Research: Atmospheres10.1002/2013JD021110Seasonal and inter-annual variabilities of biogeochemical variables, including nitrous oxide (N2O), an important climate active gas, were analyzed during monthly observations between 2002 and 2012 at an ocean Time-Series station in the coastal upwelling area off central Chile (36° 30.8′; 73° 15′). Oxygen, N2O, nutrients and chlorophyll-a (Chl-a) showed clear seasonal variability associated with upwelling favorable winds (spring-summer) and also inter-annual variability, which in the case of N2O was clearly observed during the occurrence of N2O hotspots with saturation levels of up to 4849%. These hotspots consistently took place during the upwelling-favorable periods in 2004, 2006, 2008, 2010 and 2011, below the mixed layer (15-50 m depth) in waters with hypoxia and some accumulation. The N2O hotspots displayed excesses of N2O (ΔN2O) three times higher than the average monthly anomalies (2002-2012). Estimated relationships of ΔN2O versus apparent oxygen utilization (AOU), and ΔN2O versus suggest that aerobic ammonium oxidation (AAO) and partial denitrification are the processes responsible for high N2O accumulation in subsurface water. Chl-a levels were reasonably correlated with the presence of the N2O hotspots, suggesting that microbial activities fuelled by high availability of organic matters lead to high N2O production. As a result, this causes a substantial N2O efflux into the atmosphere of up to 260 μmol m−2 d−1. The N2O hotspots are transient events or hot moments, which may occur more frequently than they are observed. If so, this upwelling area is producing and emitting greater than expected amounts of N2O and is therefore an important N2O source that should be considered in the global atmospheric N2O balance. is.9Thomson Reuters ISIatmospheric radiation, budget control, carbon dioxide, energy balance, solar radiation, sun, climate sensitivity, earth system model, feedback parameters, geoengineering, model inter comparisons, radiation management, radiative forcings, top of atmospheres, feedback, climate modeling, energy budget, radiative forcing, solar activity
Dimensión Humana2014Iverson, L., Echeverría, C., Nahuelhual, L., & Luque, S.Ecosystem services in changing landscapes: An introductionLandscape Ecology10.1007/s10980-014-9993-2Despite the importance of nitrous oxide (N2O) in the global radiative balance and atmospheric ozone chemistry, its sources and sinks within the Earth's system are still poorly understood. In the ocean, N2O is produced by microbiological processes such as nitrification and partial denitrification, which account for about a third of global emissions. Conversely, complete denitrification (the dissimilative reduction of N2O to N2) under suboxic/anoxic conditions is the only known pathway accountable for N2O consumption in the ocean. In this work, it is demonstrated that the biological assimilation of N2O could be a significant pathway capable of directly transforming this gas into particulate organic nitrogen (PON). N2O is shown to be biologically fixed within the subtropical and tropical waters of the eastern South Pacific Ocean, under a wide range of oceanographic conditions and at rates ranging from 2 pmol N L(-1) d(-) to 14.8 nmol N L(-1) d(-1) (mean ± SE of 0.522 ± 1.06 nmol N L(-1) d(-1), n = 93). Additional assays revealed that cultured cyanobacterial strains of Trichodesmium (H-9 and IMS 101), and Crocosphaera (W-8501) have the capacity to directly fix N2O under laboratory conditions; suggesting that marine photoautotrophic diazotrophs could be using N2O as a substrate. This metabolic capacity however was absent in Synechococcus (RCC 1029). The findings presented here indicate that assimilative N2O fixation takes place under extreme environmental conditions (i.e., light, nutrient, oxygen) where both autotrophic (including cyanobacteria) and heterotrophic microbes appear to be involved. This process could provide a globally significant sink for atmospheric N2O which in turn affects the oceanic N2O inventory and may also represent a yet unexplored global oceanic source of fixed N. is.2Thomson Reuters ISIcultural, ecosystem services, iufro-le, landscape ecology, planning, provisioning, regulating, south america, supporting
Dinámica del Clima2015Jacques-Coper, M., & Garreaud, R.Characterization of the 1970s climate shift in South AmericaInternational Journal of Climatology10.1002/joc.4120The concentrations of greenhouse gases (GHGs), such as nitrous oxide (N2O) and methane (CH4), were measured in the Kerguelen Plateau region (KPR). The KPR is affected by an annual microalgal bloom caused by natural iron fertilization, and this may stimulate the microbes involved in GHG cycling. This study was carried out during the KEOPS 2 cruise during the austral spring of 2011. Oceanographic variables, including N2O and CH4, were sampled (from the surface to 500 m depth) in two transects along and across the KRP, the north-south (TNS) transect (46°-51° S, ∼ 72° E) and the east-west (TEW) transect (66°-75° E, ∼ 48.3° S), both associated with the presence of a plateau, polar front (PF) and other mesoscale features. The TEW presented N2O levels ranging from equilibrium (105%) to slightly supersaturated (120%) with respect to the atmosphere, whereas CH4 levels fluctuated dramatically, being highly supersaturated (120-970%) in areas close to the coastal waters of the Kerguelen Islands and in the PF. The TNS showed a more homogenous distribution for both gases, with N2O and CH4 levels ranging from 88 to 171% and 45 to 666% saturation, respectively. Surface CH4 peaked at southeastern stations of the KPR (A3 stations), where a phytoplankton bloom was observed. Both gases responded significantly, but in contrasting ways (CH4 accumulation and N2O depletion), to the patchy distribution of chlorophyll a. This seems to be associated to the supply of iron from various sources. Air-sea fluxes for N2O (from -10.5 to 8.65, mean 1.25 ± 4.04 μmol m-2 d-1) and for CH4 (from 0.32 to 38.1, mean 10.01 ± 9.97 μmol-2 d-1) indicated that the KPR is both a sink and a source for N2O, as well as a considerable and variable source of CH4. This appears to be associated with biological factors, as well as the transport of water masses enriched with Fe and CH4 from the coastal area of the Kerguelen Islands. These previously unreported results for the Southern Ocean suggest an intense microbial CH4 production in the study area. is.8Thomson Reuters ISI1970s, climate shift, patagonia, pdo, south america, south pacific, warming, atmospheric pressure, atmospheric temperature, climatology, nickel, sea level, surface waters, tropics, climate shifts, oceanography
Dinámica del Clima2014Jara, I. A., & Moreno, P. I.Climatic and disturbance influences on the temperate rainforests of northwestern Patagonia (40 °S) since ∼14,500 cal yr BPQuaternary Science Reviews10.1016/j.quascirev.2014.01.024Although N2 fixation could represent a supplementary source of bioavailable nitrogen in coastal upwelling areas and underlying oxygen minimum zones (OMZs), the limited data available prevent assessing its variability and biogeochemical significance. Here we report the most extensive N2 fixation data set gathered to date in the upwelling area off central Chile (36°S). It covers interannual to high frequency time scales in an area of about 82,500 km2 in the eastern South Pacific (ESP). Because heterotrophic N2 fixation may be regulated by DOM availability in the ESP, we conducted experiments at different oxygen conditions and included DOM amendments in order to test diazotrophic activity. Rates in the euphotic zone showed strong temporal variability which resulted in values reaching 0.5 nmol L-1 d-1 in 2006 (average 0.32 ± 0.17 nmol L-1 d-1) and up to 126.8 nmol L-1 d-1 (average 24.75 ± 37.9 nmol L-1 d-1) in 2011. N2 fixation in subsurface suboxic conditions (1.5 ± 1.16 nmol L-1 d-1) also occurred mainly during late summer and autumn while virtually absent in winter. The diversity of diazotrophs was dominated by heterotrophs, with higher richness in surface compared to OMZ waters. Rates in oxygen depleted conditions could exceed values obtained in the euphotic layer, but rates were not dependent on the availability of dissolved organic matter. N2 fixation also showed a positive correlation with total chlorophyll and the C:N ratio of phytoplankton, but not to the P excess compared to N. We conclude that the diazotrophic community responds to the composition of phytoplankton rather than the extent of N deficiency and the availability of bulk DOM in this system. Key Points: The largest N2 fixation data set for the Eastern South Pacific is presented N2 fixation activity decreases from coast to open ocean N2 fixation is likely to be dominated by heterotrophic bacterioplankton Reuters ISIclimate change, northwestern patagonia, temperate rainforest, volcanism, wildfires, deposition, volcanoes, disturbance effects, disturbance history, disturbance regime, patagonia, regional climate, vegetation, climate effect, climate forcing, disturbance, environmental disturbance, forest fire, lowland environment, proxy climate record, rainforest, site investigation, temperate forest, chile, los rios chile, valdivia
Biogeoquímica2014Kerber, F., Querel, R. R., Rondanelli, R., Hanuschik, R., van den Ancker, M., Cuevas, O., … Czekala, H.An episode of extremely low precipitable water vapour over Paranal observatoryMonthly Notices of the Royal Astronomical Society10.1093/mnras/stt2404This study presents newly obtained coral ages of the cold-water corals Lophelia pertusa and Madrepora oculata collected in the Alboran Sea and the Strait of Sicily (Urania Bank). These data were combined with all available Mediterranean Lophelia and Madrepora ages compiled from literature to conduct a basin-wide assessment of the spatial and temporal occurrence of these prominent framework-forming scleractinian species in the Mediterranean realm and to unravel the palaeo-environmental conditions that controlled their proliferation or decline. For the first time special focus was placed on a closer examination of potential differences occurring between the eastern and western Mediterranean sub-basins. Our results clearly demonstrate that cold-water corals occurred sparsely in the entire Mediterranean during the last glacial before becoming abundant during the Bølling-Allerød warm interval, pointing to a basin-wide, almost concurrent onset in (re-)colonisation after ∼13.5. ka. This time coincides with a peak in meltwater discharge originating from the northern Mediterranean borderlands which caused a major reorganisation of the Mediterranean thermohaline circulation. During the Younger Dryas and Holocene, some striking differences in coral proliferation were identified between the sub-basins such as periods of highly prolific coral growth in the eastern Mediterranean Sea during the Younger Dryas and in the western basin during the Early Holocene, whereas a temporary pronounced coral decline during the Younger Dryas was exclusively affecting coral sites in the Alboran Sea. Comparison with environmental and oceanographic data revealed that the proliferation of the Mediterranean corals is linked with enhanced productivity conditions. Moreover, corals thrived in intermediate depths and showed a close relationship with intermediate water mass circulation in the Mediterranean sub-basins. For instance, reduced Levantine Intermediate Water formation hampered coral growth in the eastern Mediterranean Sea during sapropel S1 event as reduced Winter Intermediate Water formation did in the westernmost part of the Mediterranean (Alboran Sea) during the Mid-Holocene. Overall, this study clearly demonstrates the importance to consider region-specific environmental changes as well as species-specific environmental preferences in interpreting coral chronologies. Moreover, it highlights that the occurrence or decline of cold-water corals is not controlled by one key parameter but rather by a complex interplay of various environmental variables. is.1Thomson Reuters ISIatmospheric effects, infrared: general, methods observational, site testing
Modelación y Sistemas de Observación2014Lamy, F., Gersonde, R., Winckler, G., Esper, O., Jaeschke, A., Kuhn, G., Lambert, F. … Kilian, R.Increased dust deposition in the Pacific Southern Ocean during glacial periods.Science10.1126/science.1245424This paper, first of a two-part work, presents an overview of the development of a computational fluid dynamics (CFD) solver in OpenFOAM platform to simulate the internal ventilation regime within an open pit including the effects of developed turbulence, buoyancy and stratification. To incorporate the effect of stratification in the simulations we have chosen a formulation that includes density as a variable in the system of equations, thus facilitating further study of buoyant flows. Given the importance of turbulence in this type of large-scale flows we have used Large Eddy Simulation (LES) to incorporate it in the calculation, using a Detached Eddy Simulation (DES) approach to solve the flow near walls. Specific initial and boundary conditions were defined. The results presented in this paper, including several tests of the solver where we compared our results with experimental or numerical data, have demonstrated the validity of using OpenFOAM to study this type of complex multiphysics problems. Especially advantageous in this regard are the flexibility provided by the modular structure of the code, the possibility of defining specific boundary and initial conditions for each case, and the ability of generating detailed meshes of complex geometries. Also we probed the benefits of using a DES approach, allowing us to solve developed turbulence and the interaction of the flow with detailed geometry. A second paper associated to this work will expose the application of the solver to large open pit mines, simulating the particular case of Chuquicamata, one of the largest open pit mines in the world, located in northern Chile. is.6169Thomson Reuters ISIfactor a, organic carbon, oxygen, atmospheric deposition, climate variation, data set, depositional environment, dust, glacial environment, glacial-interglacial cycle, global climate, lithology, mobilization, paleoclimate, pollutant source, temporal analysis, antarctica, arctic climate, article, australia and new zealand, dust deposition, glacial period, glaciation, holocene, interglacial, lake sediment, last glacial maximum, latitude, new zealand, priority journal, sea, southern hemisphere, troposphere, australia, patagonia, southern ocean
Servicios Ecosistémicos2015Lara, A., Bahamondez, A., González-Reyes, A., Muñoz, A. A., Cuq, E., & Ruiz-Gómez, C.Reconstructing streamflow variation of the Baker River from tree-rings in Northern Patagonia since 1765Journal of Hydrology10.1016/j.jhydrol.2014.12.007The particular conditions of air circulation inside large open pit mines under intense insolation, dominated by mechanical and buoyant effects, are crucial when studying the dispersion of pollutants inside and outside the pit. Considering this, we study this problem using CFD tools able to include the complex geometry characterizing it and the different processes affecting circulation: flow interaction with obstacles, buoyancy, stratification and turbulence. We performed simulations using a previously developed OpenFOAM solver, focusing in the particular case of Chuquicamata, a large open pit mine (∼1. km deep) located in northern Chile. Both idealized and real topographies were used. Given the importance of turbulence in this type of large-scale flows we have used LES to incorporate it in the calculation, using a DES approach to solve the flow near walls.The results from the idealized cases support the idea that buoyant currents foster the exit of particles from the pit and increase the turbulence inside its atmosphere, modifying the purely mechanical recirculatory flow inside the cavity. Differences in the air circulation and dispersion of particles between idealized and non-idealized cases are reported. In particular, there are changes in the intensity and location of the recirculation inside the pit due to variations in the aspect ratio (length/depth) of the cavity along the axis perpendicular to the main flow. Also, the topography surrounding the mine affects the main flow that sweeps the cavity, channeling it along the main axis of the pit and forcing it to enter the cavity through the lower level of the top edge. As a consequence, the patterns of pollutant transport observed in the idealized cases, dominated by near-wall upward currents, are different than those observed in the cases with complex topography, where the dispersion is dominated by internal buoyant upward currents. Anyhow, whether by internal or near wall upward currents, in all buoyant cases considered a large percentage of the particles injected inside the pit leaves the cavity.Further experiments studying the effect of 3D aspect ratio over the mechanically forced internal flow are needed to fully understand the effect of the internal geometry of the pit over the flow. © 2013 Elsevier Ltd. Reuters ISIargentina, chile, climate variability, nothofagus pumilio, southern annular mode, water resources, climate change, complex networks, decision making, forestry, regression analysis, rivers, stream flow, water management, nothofagus, climate forcing, glacial lake, glacier retreat, long-term change, meltwater, reconstruction, streamflow, tree ring, water resource, aisen, baker basin, patagonia, fitzroya cupressoides, pilgerodendron uviferum
Servicios Ecosistémicos2015Little, C., Cuevas, J. G., Lara, A., Pino, M., & Schoenholtz, S.Buffer effects of streamside native forests on water provision in watersheds dominated by exotic forest plantationsEcohydrology10.1002/eco.1575Coastal upwelling ecosystems are areas of high productivity and strong outgassing, where most gases, such as N2O and CH4, are produced in subsurface waters by anaerobic metabolisms. We describe seasonal CH4 variation as well as potential mechanisms producing CH4 in surface waters of the central Chile upwelling ecosystem (36°S). Surface waters were always supersaturated in CH4 (from 125% up to 550%), showing a clear seasonal signal triggered by wind driven upwelling processes (austral spring-summer period), that matched with the periods of high chlorophyll-a and dimethylsulfoniopropionate (DMSP) levels. Methane cycling experiments, with/without the addition of dimethylsulfide (including 13C-DMS) and acetylene (a nonspecific inhibitor of CH4 oxidation) along with monthly measurements of CH4, DMSP and other oceanographic variables revealed that DMS can be a CH4 precursor. Net CH4 cycling rates (control) fluctuated between -0.64 and 1.44nmolL-1d-1. After the addition of acetylene, CH4 cycling rates almost duplicated relative to the control, suggesting a strong methanotrophic activity. With a spike of DMS, the net CH4 cycling rate significantly increased relative to the acetylene and control treatment. Additionally, the δ13C values of CH4 at the end of the incubations (after addition of 13C enriched-DMS) were changed, reaching -32‰ PDB compared to natural values between -44‰ and -46‰ PDB. These findings indicate that, in spite of the strong CH4 consumption by methanotrophs, this upwelling area is an important source of CH4 to the atmosphere. The effluxes are derived partially from in situ surface production and seem to be related to DMSP/DMS metabolism. © 2013 Elsevier Ltd. is.7Thomson Reuters ISIchile, ecosystem services, nitrogen, riparian zones, unpolluted, water yield, biological materials, ecology, ecosystems, timber, watersheds, forestry, concentration (composition), ecoregion, ecosystem service, plantation, rainforest, riparian zone, water quality, watershed, eucalyptus, pinus radiata
Dinámica del Clima2014Mechoso, C. R., Wood, R., Weller, R., Bretherton, C. S., Clarke, A. D., Coe, H., Garreaud, R. D., … Zuidema, P.Ocean-Cloud-Atmosphere-Land Interactions in the Southeastern Pacific: The VOCALS ProgramBulletin of the American Meteorological Society10.1175/BAMS-D-11-00246.1Coastal upwelling areas are highly productive marine systems in which the development of oxygen-depleted conditions and the availability of diverse electron donors (e.g., organic matter, NHz 4 ,H2S) favor the processes involved in nitrogen (N) loss. We characterize the temporal and vertical variability of anammox and denitrification over the continental shelf off central Chile (36.5°S), through 15N and 13C tracer experiments, including amendments with H2S and S2O2- 3 along with measurements of 15N2 and 15N2O production and oceanographic variables during a year (2009 to 2010). Restricted to the bottom waters, both anammox and denitrification contributed similarly (∼ 500 nmol N2 L-1 d-1) to N loss during spring, while a marked decrease in the activity of these processes occurred in summer (103 and 14 nmolN2 L-1 d-1 for anammox and denitrification, respectively). During fall, denitrification was the only contributor to the observed nitrogen deficit (894 nmol N2 L-1 d-1). Interestingly, a substantial increase in the rates of denitrification (∼ 1200 nmol N2 L-1 d-1) and dark 13C assimilation were observed after the addition of H2S, indicating an autotrophic contribution to denitrification, which could be fueled in situ by H2S emitted from sediments or produced in the water column. The observed patterns seem to be controlled (stimulated or inhibited) by the availability of oxygen, organic matter, andH2S. This study establishes the magnitude and co-occurrence of the different processes responsible for N removal in the coastal upwelling system of central Chile. This linkage of the nitrogen, carbon, and sulfur cycles is relevant to a global climate change scenario. is.3Thomson Reuters ISIresearch, climate process, climate research, international researches, intertropical convergence zone, marine boundary layers, ocean-atmosphere system, research activities, sea surface temperature (sst), oceanography
Biogeoquímica2014Mohtadi, M., Prange, M., Oppo, D. W., de Pol-Holz, R., Merkel, U., Zhang, X., … Lückge, A.North Atlantic forcing of tropical Indian Ocean climate.Nature10.1038/nature13196Over much of the ocean’s surface, productivity and growth are limited by a scarcity of bioavailable nitrogen. Sedimentary δ15N records spanning the last deglaciation suggest marked shifts in the nitrogen cycle during this time, but the quantification of these changes has been hinderedby the complexity of nitrogen isotope cycling. Herewe present a database of δ15Nin sediments throughout the world’s oceans, including 2,329 modern seafloor samples, and 76 timeseries spanning the past 30,000 years. We showthat the δ15Nvalues of modern seafloor sediments are consistent with values predicted by our knowledge of nitrogen cycling in thewater column. Despite many local deglacial changes, the globally averaged δ15N values of sinking organic matter were similar during the Last Glacial Maximum and Early Holocene. Considering the global isotopic mass balance, we explain these observations with the following deglacial history of nitrogen inventory processes. During the Last Glacial Maximum, the nitrogen cycle was near steady state. During the deglaciation, denitrification in the pelagic water column accelerated. The flooding of continental shelves subsequently increased denitrification at the seafloor, and denitrification reached near steady-state conditions again in the Early Holocene.We use a recent parameterization of seafloor denitrification to estimate a 30-120% increase in benthic denitrification between 15,000 and 8,000 years ago. Based on the similarity of globally averaged δ15N values during the Last Glacial Maximum and Early Holocene, we infer that pelagic denitrification must have increased by a similar amount between the two steady states. is.7498Thomson Reuters ISIoxygen, rain, sea water, article, atlantic ocean, climate, indian ocean, paleoclimate, planktonic foraminifera, precipitation, priority journal, sea surface temperature, seasonal variation, younger dryas, africa, air, borneo, chemistry, greenland, history, humidity, hydrology, ice cover, indonesia, lake, salinity, season, sediment, temperature, theoretical model, time, tropic climate, water flow, africa, eastern, geologic sediments, history, 19th century, history, 20th century, history, 21st century, history, ancient, lakes, models, theoretical, oxygen isotopes, seasons, seawater, time factors, tropical climate, water movements
Dinámica del Clima; Modelación y Sistemas de Observación; Servicios Ecosistémicos2014Moreno, P. I., Vilanova, I., Villa-Martínez, R., Garreaud, R., Rojas, M., & de Pol-Holz, R.Southern Annular Mode-like changes in southwestern Patagonia at centennial timescales over the last three millennia.Nature Communications10.1038/ncomms5375Ozone (O3) soundings have been performed on Easter Island or Rapa Nui (27 °S, 109 °W, 51 m a.s.l.) since 1994 as part of the Global Atmospheric Watch Programme of the World Meteorological Organization. In this work, we analyse 260 soundings compiled over the period 1994–2014, and make the data available for the international community. We characterise O3 profiles over this remote area of the Pacific by means of statistical analyses that consider, on the one hand, a traditional climatology that describes the data in terms of seasonal cycles based on monthly averages and, on the other hand, a process-oriented analysis based on self-organising maps. Our analyses show the influence of both tropical and subtropical/mid-latitude air masses at Rapa Nui. The former occurs in summer and fall when convective conditions prevail, and the latter in late winter and spring when subsiding conditions are recurrent. The occurrence of stratospheric intrusions in late winter and spring in connection with deep troughs and the presence of the subtropical jet stream is also apparent in the data set. The tropospheric ozone column is in good agreement with the corresponding data derived from satellites but with a systematic overestimate of summer and fall values. There is evidence of an upward trend in ozone near the surface, which suggests the impact of local pollution. We look forward to an enhancement of the Rapa Nui observing site, given its location that offers a privileged position to observe climate change over the sparsely sampled and vast South Pacific Ocean. Reuters ISIcarbon dioxide, air temperature, bronze age, geological record, medieval warm period, paleoclimate, roman era, teleconnection, timescale, twentieth century, westerly, article, atmosphere, canopy, chile, concentration (parameters), environmental change, forest fragmentation, palynology, sediment, southern annular mode, southern westerly wind, stratigraphy, patagonia
Dimensión Humana2014Nahuelhual, L., Carmona, A., Laterra, P., Barrena, J., & Aguayo, M.A mapping approach to assess intangible cultural ecosystem services: The case of agriculture heritage in Southern ChileEcological Indicators10.1016/j.ecolind.2014.01.005The current study aims to evaluate the capabilities of soil water balance modeling to estimate ET for very different conditions of rainfed grapevine water status, within a vineyard landscape that depicts heterogeneities in canopy, soil and water table conditions. We calibrated the HYDRUS-1D model against measurements of the soil moisture profile within seven contrasted sites, we validated HYDRUS-1D simulations against ET estimates derived from eddy covariance (EC) measurements within two contrasted sites, and we analyzed the temporal dynamics of the HYDRUS-1D ET simulations throughout almost two growth cycles for the seven sites. The calibration of HYDRUS-1D was correctly achieved, with a relative RMSE of 20% on average. Validation of HYDRUS-1D simulations against EC measurements was satisfactory, with RMSE values of about 40 W m−2 at the hourly timescale and 0.5 mm d−1 at the daily timescale. HYDRUS-1D was able to provide consistent time series of ET within the seven contrasted sites and throughout the two growth cycles. We conclude that HYDRUS-1D simulations can be used as an alternative to EC measurements within rainfed vineyards, to alleviate experimental efforts for device cost and maintenance. Further, HYDRUS-1D simulations can be used for characterizing spatial variabilities and temporal dynamics, assessing impact of pedological conditions and land use on ET, or validating remote sensing retrievals over regional extents. Reuters ISIcultural landscapes, economic benefits, economic valuation, knowledge systems, mapping ecosystem services, cultural landscape, ecosystem services, knowledge system, cultivation, economics, ecosystems, geographic information systems, knowledge management, mapping, seed, assessment method, ecosystem service, gis, mapping method, numerical model, potato, valuation, chile
Dinámica del Clima2014Pesce, O. H., & Moreno, P. I.Vegetation, fire and climate change in central-east Isla Grande de Chiloé (43°S) since the Last Glacial Maximum, northwestern PatagoniaQuaternary Science Reviews10.1016/j.quascirev.2014.02.021Plant growth at extremely high elevations is constrained by high daily thermal amplitude, strong solar radiation, and water scarcity. These conditions are particularly harsh in the tropics, where the highest elevation treelines occur. In this environment the maintenance of a positive carbon balance involves protecting the photosynthetic apparatus and taking advantage of any climatically favorable periods. To characterize photoprotective mechanisms at such high elevations, and particularly to address the question of whether these mechanisms are the same as those previously described in woody plants along extratropical treelines, we have studied photosynthetic responses in Polylepis tarapacana in the central Andes (18 °S) along an elevational gradient from 4,300 to 4,900 m. For comparative purposes this gradient has been complemented with a lower elevation site (3,700 m) where another Polylepis species (P. rugulosa) occurs. During the daily cycle, two periods of photosynthetic activity were observed: one during the morning when, despite low temperatures, assimilation was high; and the second starting at noon when the stomata closed because of a rise in the vapor pressure deficit and thermal dissipation is prevalent over photosynthesis. From dawn to noon there was a decrease in the content of antenna pigments (chlorophyll b and neoxanthin), together with an increase in the content of xanthophyll cycle carotenoids. These results could be caused by a reduction in the antenna size along with an increase in photo-protection. Additionally, photo-protection was enhanced by a partial overnight retention of de-epoxised xanthophylls. The unique combination of all of these mechanisms made possible the efficient use of the favorable conditions during the morning while still providing enough protection for the rest of the day. This strategy differs completely from that of extratropical mountain trees, which uncouple light-harvesting and energy-use during long periods of unfavorable, winter conditions. Reuters ISIlast glacial termination/holocene, northwestern patagonia, paleofires, southern westerly winds, temperate rainforests, fires, glacial geology, vegetation, last glacial terminations, patagonia, temperate rainforest, climate change, climate variation, fire history, herb, last glacial maximum, paleoclimate, paleoenvironment, shrub, vegetation history, wind direction, chile, chiloe island, los lagos
Dimensión Humana2014Romero-Lankao, P., Hughes, S., Qin, H., Hardoy, J., Rosas-Huerta, A., Borquez, R., & Lampis, A.Scale, urban risk and adaptation capacity in neighborhoods of Latin American citiesHabitat International10.1016/j.habitatint.2013.12.008Central Chile is a densely populated region along the west coast of subtropical SouthAmerica (30°-36°S), limited to the east by the Andes. Precipitation is concentrated in austral winter, mostly associated with the passage of cold fronts. The freezing level over central Chile is typically between 1500 and 2500m when precipitation is present. In about a third of the cases, however, precipitation occurs accompanied by warm temperatures and freezing levels above 3000 m, leading to a sizeable increment in the pluvial area of Andean basins and setting the stage for hydrometeorological hazards. Here, warm winter storms in central Chile are studied, including a statistical description of their occurrence and an estimate of their hydrological impacts. Remote-sensed data and high-resolution reanalysis are used to explore the synoptic-scale environment of a typical case, generalized later by a compositing analysis. The structure of warm storms is also contrasted with that of the more recurrent cold cases. Precipitation during warm events occurs in the warm sector of a slow-moving cold front because of the intense moisture flux against the mountains in connection with a land-falling atmospheric river. This is in turn driven by a strong zonal jet aloft and reduced mechanical blocking upstream of the Andes. On a broader scale, a key element is the presence of a slowly moving anticyclone over the south Pacific, fostering advection of cold air intomidlatitudes. The intense and persistent zonal jet stretches a moist-air corridor from the central Pacific to the west coast of South America. © 2013 American Meteorological Society. Reuters ISIadaptation capacity, informality, latin america cities, scale, urban risk, adaptive management, neighborhood, risk assessment, urban area, latin america
Servicios Ecosistémicos2014Romero-Mieres, M., González, M. E., & Lara, A.Recuperación natural del bosque siempreverde afectado por tala rasa y quema en la Reserva Costera Valdiviana, ChileBosque10.4067/S0717-92002014000300001The Nahuelbuta Mountains (NM) are a semielliptical massif 1300 m high in coastal southern Chile (37°–38°S) facing frontal storms that move from the Pacific. Mean precipitation between 900 and 1200 mm yr−1 is observed in the surrounding lowland, but river flow measurements suggest values ≥3000 mm yr−1 atop the mountains. To verify and characterize such marked orographic enhancement, 15 rain gauges were deployed around and over the NM. The observations were supplemented by a high-resolution WRF simulation and linear theory (LT) modeling during the winter of 2011. The estimated mean precipitation increases gradually from offshore (~1000 mm yr−1) to the north-facing foothills (2000 mm yr−1). The precipitation rapidly increases in the upslope sector to reach ~4000 mm yr−1 over the northern half of the NM elevated plateau, and decreases farther south to reach background values 20–30 km downstream of the mountains. The upstream (downstream) orographic enhancement (suppression) was relatively uniform among storms when considering event accumulations but varied substantially within each storm, with larger modifications during pre- and postfrontal stages and minor modifications during the brief but intense frontal passage. WRF results are in good agreement with observations in terms of seasonal and daily mean rainfall distributions, as well as temporal variability. Given its linear, steady-state formulation, the LT model cannot resolve rainfall variability at short (hourly) time scales, which in WRF is at least characterized by transient, mesoscale rainbands. Nonetheless, the rainbands are mobile so the accumulation field at monthly or longer time scales produced by the linear model is remarkably similar to its WRF counterpart. is.3Thomson Reuters ISIburning, clearcutting, evergreen forest, foristic diversity, chusquea, costera, drimys winteri, embothrium coccineum, embryophyta, lophosoria quadripinnata, luma, nothofagus nitida, saxegothaea conspicua
Biogeoquímica2015Rondanelli, R., Molina, A., & Falvey, M.The Atacama Surface Solar MaximumBulletin of the American Meteorological Society10.1175/BAMS-D-13-00175.1On the basis of 8-years (2005-2012) of stroke data from the World Wide Lightning Location Network we describe the spatial distribution and temporal variability of lightning activity over Western Patagonia. This region extends from ∼40°S to 55°S along the west coast of South America, is limited to the east by the austral Andes, and features a hyper-humid, maritime climate. Stroke density exhibits a sharp maximum along the coast of southern Chile. Although precipitation there is largely produced by cold nimbostratus, days with more than one stroke occur up to a third of the time somewhere along the coastal strip. Disperse strokes are also observed off southern Chile. In contrast, strokes are virtually nonexistent over the austral Andes - where precipitation is maximum - and farther east over the dry lowlands of Argentina. Atmospheric reanalysis and satellite imagery are used to characterize the synoptic environment of lightning-producing storms, exemplified by a case study and generalized by a compositing analysis. Lightning activity tends to occur when Western Patagonia is immersed in a pool of cold air behind a front that has reached the coast at ∼40°S. Under these circumstances, midlevel cooling occurs before and is more prominent than near-surface cooling, leading to a weakly unstable postfrontal condition. Forced uplift of the strong westerlies impinging on the coastal mountains can trigger convection and produces significant lightning activity in this zone. Farther offshore, large-scale ascent near the cyclone's center may lift near-surface air parcels, fostering shallow convection and dispersing lightning activity. Key Points Significant lightning activity occurs in Western Patagonia Lightning storms develop under a cold, weakly unstable postfrontal condition Topography and ocean conditions favor lightning activity in Western Patagonia. © 2014. American Geophysical Union. All Rights Reserved. is.3Thomson Reuters ISIaerosols, atmospheric composition, radiation, solar radiation, sun, water vapor, atmospheric extinction, atmospheric transparency, descriptive analysis, global distribution, regional climate, semi-empirical modeling, surface solar radiation, twentieth century, surface topography
Modelación y Sistemas de Observación2014Shaffer, G.Formulation, calibration and validation of the DAIS model (version 1), a simple Antarctic ice sheet model sensitive to variations of sea level and ocean subsurface temperatureGeoscientific Model Development10.5194/gmd-7-1803-2014Patagonia, located in southern South America, is a vast and remote region holding a rich variety of past environmental records but a small number of meteorological stations. Precipitation over this region is mostly produced by disturbances embedded in the westerly flow and is strongly modified by the austral Andes. Uplift on the windward side leads to hyperhumid conditions along the Pacific coast and the western slope of the Andes; in contrast, downslope subsidence dries the eastern plains leading to arid, highly evaporative conditions.The authors investigate the dependence of Patagonia’s local climate (precipitation and near-surface air temperature) year-to-year variability on large-scale circulation anomalies using results from a 30-yr-long high-resolution numerical simulation. Variations of the low-level zonal wind account for a large fraction of the rainfall variability at synoptic and interannual time scales. Zonal wind also controls the amplitude of the air temperature annual cycle by changing the intensity of the seasonally varying temperature advection.The main modes of year-to-year variability of the zonal flow over southern South America are also investigated. Year round there is a dipole between mid- and high latitudes. The node separating wind anomalies of opposite sign migrates through the seasons, leading to a dipole over Patagonia during austral summer and a monopole during winter. Reanalysis data also suggests that westerly flow has mostly decreased over north-central Patagonia during the last four decades, causing a drying trend to the west of the Andes, but a modest increase is exhibited over the southern tip of the continent. is.4Thomson Reuters ISIcalibration, hindcasting, ice flow, model validation, sea level change, subsurface flow, water depth, antarctic ice sheet, antarctica
Servicios Ecosistémicos2014Ulrich, W., Soliveres, S., Maestre, F. T., Gotelli, N. J., Quero, J. L., Delgado-Baquerizo, M., Gómez-González, S., … Zaady, E.Climate and soil attributes determine plant species turnover in global drylands.Journal of biogeography10.1111/jbi.12377Developing spatially resolved high-resolution datasets of robust long-term changes in human demography constitutes a major challenge for archaeology. One approach is to use the distribution of summed radiocarbon-age probabilities to infer long-term population dynamics (i.e. palaeodemography). However, these can often be biased by preservation potential, site taphonomy or researcher priorities among other aspects, all of which require large datasets to resolve adequately. For this report, we have created such a dataset for the South-Central Andes (16°-25°S), here termed the South Central Andes Radiocarbon (SCAR) database. SCAR spans the last 15,000 years and incorporates ∼1700 14C-dates from 519 archeological sites reported across an extreme bioclimatic gradient that includes the hyperarid coastal Atacama Desert and adjacent cold, high-elevation Altiplano. Among the possible methodological biases, we first evaluated those related to calibration procedures. Otherwise, changes in summed probability curves show no other relevant biases except for possible research interest/priorities that could be responsible for the gaps in the record from the Bolivian altiplano. Our temporally continuous time-series indicates that prehispanic populations exhibited significant demographic changes during the last 13,100calBP. Except for coastal populations; most regions show strongly coordinated demographic fluctuations that follow the same major patterns. Thus, we identified two broad scale population events across the South-Central Andes (Atacama inland, Bolivian Altiplano) from 13,100-4000calBP and then from 4000calBP to the present. In contrast, the Atacama coastal records suggest a different and more variable occupation pattern over the last 13,460calBP, which could be driven by the interaction with oceanographic processes (i.e. upwelling). A widespread major decline at 700calBP clearly predates the Spanish colonization and occurs in all of our regions. This widespread decline does not appear to be due to methodological biases, and suggests that a population crash occurred before European occupation. Overall, the SCAR database constitutes a valuable proxy for establishing the long-term dynamics of prehistoric societies that inhabited the western Andean slope. Time-series analyses that use SCAR will shed new light on the demographic and cultural dynamics at different spatial-scales, and help clarify the processes involved in the migrational trajectories and cultural evolution of the peoples that inhabited the South-Central Andes over the last 15,000 years. is.12Thomson Reuters ISIaridity, beta diversity, climatic variability, global environmental change, habitat filtering, latitudinal gradient, plant community assembly, regression analysis, soil fertility, spatial soil heterogeneity, climate change, global change, habitat fragmentation, heterogeneity, plant community, species diversity, turnover
Servicios Ecosistémicos2015Urrutia-Jalabert, R., Rossi, S., Deslauriers, A., Malhi, Y., & Lara, A.Environmental correlates of stem radius change in the endangered Fitzroya cupressoides forests of southern ChileAgricultural and Forest Meteorology10.1016/j.agrformet.2014.10.001Megacities are not only important drivers for socio-economic development but also sources of environmental challenges. Many megacities and large urban agglomerations are located in the coastal zone where land, atmosphere, and ocean meet, posing multiple environmental challenges which we consider here. The atmospheric flow around megacities is complicated by urban heat island effects and topographic flows and sea breezes and influences air pollution and human health. The outflow of polluted air over the ocean perturbs biogeochemical processes. Contaminant inputs can damage downstream coastal zone ecosystem function and resources including fisheries, induce harmful algal blooms and feedback to the atmosphere via marine emissions. The scale of influence of megacities in the coastal zone is hundreds to thousands of kilometers in the atmosphere and tens to hundreds of kilometers in the ocean. We list research needs to further our understanding of coastal megacities with the ultimate aim to improve their environmental management. Reuters ISIcarbon accumulation, dendrochronology, dendrometer, stem daily cycle, stem increment, fitzroya cupressoides
Dinámica del Clima2014Viale, M., & Garreaud, R.Summer Precipitation Events over the Western Slope of the Subtropical AndesMonthly Weather Review10.1175/MWR-D-13-00259.1Post-fire recruitment by seeds is regarded as an adaptive response in fire-prone ecosystems. Nevertheless, little is known about which heritable seed traits are functional to the main signals of fire (heat and smoke), thus having the potential to evolve. Here, we explored whether three seed traits (pubescence, dormancy and shape) and fire regime modulate seed response to fire cues(heat and smoke). As a model study system, we used Helenium aromaticum (Asteraceae), a native annual forb from the Chilean matorral, where fires are anthropogenic. We related seed trait values with fitness responses (germination and survival) after exposure to heat-shock and smoke experimental treatments on seeds from 10 H . aromaticum wild populations. We performed a phenotypic selection experiment to examine the relationship of seed traits with post-treatment fitness within a population (adaptive hypothesis). We then explored whether fire frequency in natural habitats was associated with trait expression across populations, and with germination and survival responses to experimental fire-cues. We found that populations subjected to higher fire frequency had, in average, more rounded and pubescent seeds than populations from rarely burned areas. Populations with more rounded and pubescent seeds were more resistant to 80°C heat-shock and smoke treatments.There was correlated selection on seed traits: pubescent-rounded or glabrouscent-elongated seeds had the highest probability of germinating after heat-shock treatments. Seed pubescence and shape in H . aromaticum are heritable traits that modulate adaptive responses to fire. Our results provide new insights into the process of plant adaptation to fire and highlight the relevance of human-made fires as a strong evolutionary agent in the Anthropocene. is.3Thomson Reuters ISIconvective precipitation, in-situ observations, precipitating clouds, precipitation systems, stratiform precipitation, summer precipitation, synoptic climatology, temperature inversions, atmospheric temperature, climatology, diagnosis, satellite imagery, storms, wind, rain, airflow, buoyancy, precipitation (climatology), subtropical region, summer, synoptic meteorology, andes
Dinámica del Clima2014Garreaud, R., & Viale, M.Análisis de los fenómenos meteorológicos y climáticos que afectan la cuenca del río MaipoAquae PapersRealizado bajo la coordinación de Manuel Cermerón, en el estudio han participado profesores e investigadores de la Universidad de Chile y de la Universidad Federico Santa María. El estudio considera tres ámbitos de investigación: análisis de los fenómenos Meteorológicos y Climáticos que afectan la Cuenca del Maipo, análisis de las características Geológicas y Geotécnicas de laderas en la Cuenca del Maipo, y un estudio sobre la determinación de posibles impactos en la gestión de los abastecimientos humanos de agua de la zona metropolitana de Chile y una proposición de alternativas de solución que mitiguen dichos impactos. indexed
Dimensión Humana2014Maljean-Dubois, S., & Moraga Sariego, Pilar.Le principe des responsabilités communes mais différenciées dans le régime international du climatLes Cahiers de droit10.7202/1025500arParmi les accords internationaux sur l’environnement, le régime du climat offre l’application la plus aboutie du principe des responsabilités communes mais différenciées. Mais ce domaine révèle aussi tout particulièrement les difficultés d’application dudit principe. Justice, équité, responsabilités communes mais différenciées sont invoquées par les uns et par les autres pour servir parfois des fins diamétralement opposées. Depuis l’adoption de la Convention-cadre des Nations Unies sur les changements climatiques (1992) et du Protocole de Kyoto (1997), la structure des émissions mondiales de gaz à effet de serre a considérablement évolué, ne serait-ce que du fait de l’augmentation considérable des émissions des pays émergents et en particulier de la Chine. Bouclier pour les uns, repoussoir pour les autres, le principe est aujourd’hui très fréquemment invoqué dans les difficiles négociations du « post-2012 » et du « post-2020 », et voit son rôle progressivement évoluer. is.1LegalTrac y Lexis Nexis
Dimensión Humana2015Urquiza, A., & Cadenas, H.Sistemas socio-ecológicos: elementos teóricos y conceptuales para la discusión en torno a vulnerabilidad hídricaL'Ordinaire des Amériques10.4000/orda.1774Several areas of Latin America suffer from water-related shortages and vulnerabilities. This situation has never been properly handled by local public authorities and has seen no real theoretical advances allowing a better understanding of the problem. This paper will focus on the conceptual analysis of socio-ecological systems and water-related shortages and vulnerabilities. It will use two theoretical approaches: that of complex adaptive systems and that of autopoietic social systems (i.e. systems able to maintain themselves in a larger environment, which makes them close to resilient systems). The goal is to suggest a few starting points for the study of this phenomenon, based on contemporary academic sources, in order to show how different theoretical models can be combined. The conclusion will stress the need to look for more complementary and inclusive perspectives to improve our understanding of contemporary environmental problems.
Modelación y Sistemas de Observación2016Albrecht, F., & Shaffer, G.Regional Sea-Level Change along the Chilean Coast in the 21st centuryJournal of Coastal Research10.2112/JCOASTRES-D-15-00192.1The fire season of 2014-2015 in Chile has been one of the worst of the last 50 years, with large and simultaneous fires affecting vast areas of Andean Araucaria-Nothofagus forests in several national parks, forest reserves and private properties. The worst-affected protected areas are China Muerta and Malleco National Reserves, and Conguillío and Tolhuaca National Parks, with an estimated total area of.12,000 ha burned. In 2002 fires burned.20,000 ha, af- fecting mostly the same protected areas and other private land covered by Araucaria forests, with c. 30 and 60%of the total area of Malleco National Reserve and Tolhuaca National Park burned, respectively. As then, the 2014-2015 fires have stirred public, political and scientific concern. is.6Thomson Reuters ISIcmip5, gia, ice loss, sea-level contributions, cmip, coast, glacioisostasy, global perspective, ice, intergovernmental panel on climate change, regional pattern, twenty first century, chile, pacific coast chile, pacific coast south america, pacific ocean, pacific ocean (southeast)
Biogeoquímica2015Alcamán, M. E., Fernandez, C., Delgado-Huertas, A., Bergman, B., & Díez, B.The cyanobacterium Mastigocladus fulfills the nitrogen demand of a terrestrial hot spring microbial matThe ISME Journal10.1038/ismej.2015.63Canopy gaps have been recognized as an important process in the regeneration dynamics of Andean old-growth forests (ca. 40º S). The objectives of the study were to determine main tree-fall gap attributes and to assess tree recruitment and growth patterns in tree-fall gaps of two mid-elevation Andean old-growth forests. We measured the canopy and expanded area of each gap, and for the gap-maker species we measured its diameter at breast height (dbh), felling direction and type of treefall. In each gap, tree seedlings, saplings and bamboo culms were counted in subplots. Increment cores of potential successors were obtained to examine growth patterns. There was a larger area in canopy gaps in NF than in STF (25.8 vs. 11.9 %). Expanded gaps were on average larger in NF than in STF (547 vs. 440 m2 ). Most gaps were originated by wind-snap and upturned root-plates of all the major tree species (Laureliopsis philippiana, Saxegothaea conspicua and Dasyphyllum diacanthoides, and Nothofagus dombeyi in NF). The understory species Chusquea culeou was an important competitor in gaps, especially in STF where the bamboo was more effective inhibiting the recruitment of tree seedlings. The successful recruitment of shade-tolerant tree species beneath endogenous tree-fall gaps indicates that these species follow a gap-phase regeneration mode through which -after several growth releases- they can reach the main canopy. These studies could offer valuable insights for the urgently required restoration and management of Andean old-growth forests. is.10Thomson Reuters ISIcyanobacterium, enzyme activity, gene expression, microbial mat, nitrogen cycle, photoautotrophy, spatial distribution, species diversity, thermal spring, chile, patagonia, cyanobacteria, mastigocladus, stigonematales, acetylene, bacterial dna, bacterial protein, messenger rna, nitrogen, nitrogenase, nitrogenase reductase, oxidoreductase, rna 16s, biodiversity, ecosystem, genetics, isolation and purification, metabolism, microbiology, nitrogen fixation, physiology, bacterial proteins, dna, bacterial, hot springs, oxidoreductases, rna, messenger, rna, ribosomal, 16s
Dimensión Humana2016Aldunce, P., Beilin, R., Handmer, J., & Howden, M.Stakeholder participation in building resilience to disasters in a changing climateEnvironmental Hazards10.1080/17477891.2015.1134427Second-growth forests represent the greatest potential resource for forest management and large-scale ecological restoration in many regions. In south-central Chile, second-growth forests include those dominated by Nothofagus obliqua , N. dombeyi , Drimys winteri , and a mixture of evergreen species, especially hardwoods. This article examines the influence of fire and logging on the establishment patterns and development of second-growth forests in south-central Chile. We characterize the size structure and composition of these four types of forests with sampling plots. The identification of the type of disturbance and its date of occurrence was determined from evidence such as fire scars and even-aged pulses of tree establishment. The size, structure and species composition of these forests indicate an intermediate state of development with an average density and basal area ranging from 1294 to 5038 trees ha -1 and from 59 to 85 m 2 ha -1 , respectively. Logging and/or devastating fires that occurred in the early decades of the 1900s promoted the relatively rapid establishment and growth of pioneer species ( Nothofagus obliqua, N. dombeyi, D. winteri ). In the Mixed Evergreen second-growth forests, mid-shade or shade tolerant species (e.g., Gevuina avellana, Eucryphia cordifolia, Amomyrtus luma, and A. meli ) became established mostly through vegetative sprouting. Fires and logging have been pervasive factors in determining the structural and compositional uniformity of the native forests of south-central Chile. Ecological restoration at a landscape level, either by ecological processes (i.e., a reduction in fire frequency) and/or the structure and composition of second-growth forests, provide a relevant approach to accelerating the generation of attributes of old-growth forests, therefore meeting manifold societal demands for forest goods and services. Los bosques secundarios representan el mayor recurso forestal para el manejo y la restauración de gran escala en muchas regiones del mundo. En el centro-sur de Chile los bosques secundarios están dominados por Nothofagus obliqua , N. dombeyi , D. winteri , y Siempreverde mixtos. El presente artículo examina la influencia del fuego y tala en los patrones de establecimiento y desarrollo de bosques secundarios de la región centro-sur de Chile. Para la caracterización de la estructura y composición de cada bosque secundario se seleccionaron rodales representativos estableciendo 4-6 parcelas de 900 m 2 . El tipo de disturbio y su fecha de ocurrencia fue establecido a través de evidencias tales como cicatrices de fuego y pulsos de establecimiento de árboles. La estructura de tamaños y composición indican un estado de desarrollo intermedio o de reiniciación del sotobosque presentando en promedio una densidad y área basal que varía entre 1294 y 5038 árboles ha -1 y entre 59 y 85 m 2 ha -1 , respectivamente. Incendios de gran severidad y/o madereo ocurridos en las primeras décadas de los 1900 promovieron un rápido establecimiento de las principales especies pioneras ( Nothofagus obliqua, N. dombeyi, D. winteri ). En los bosques secundarios Siempreverde mixtos, el establecimiento de especies tolerantes o semi-tolerantes a la sombra (ej., Gevuina avellana, Eucryphia cordifolia ), fue principalmente por rebrotes vegetativos. El fuego y madereo han sido agentes clave en determinar la uniformidad estructural y composicional de los bosques nativos del centro-sur de Chile. La restauración ecológica a escala de paisaje, tanto de procesos ecológicos (frecuencia incendios) como de la estructura y composición de los bosques secundarios, ofrece una relevante aproximación para acelerar la generación de atributos de bosques antiguos que satisfagan los múltiples bienes y servicios ecosistémicos demandados por la sociedad. is.1Thomson Reuters ISIclimate change, discourse, interdisciplinary, resilience, social learning, stakeholder and community participation, adaptive management, communication, development discourse, disaster management, ecological modernization, environmental policy, interdisciplinary approach, learning, local government, local participation, stakeholder, australia, queensland
Dinámica del Clima2015Álvarez, C., Veblen, T. T., Christie, D. A., & González-Reyes, Á.Relationships between climate variability and radial growth of Nothofagus pumilio near altitudinal treeline in the Andes of northern Patagonia, ChileForest Ecology and Management10.1016/j.foreco.2015.01.018Air quality networks need revision and optimisation as instruments and network requirements, both scientific and societal, evolve over time. Assessing and optimising the information content of a monitoring network is a non-trivial problem. Here, we introduce a methodology formulated in a variational framework using an air quality model to simulate the dispersion of carbon monoxide (CO) as a passive tracer at the city scale.Weaddress the specific case of adding or removing stations, and the more general situation of optimally distributing a given number of stations in a domain taking into account transport patterns and spatial factors such as population density and emission patterns.Weconsider three quality indicators: precision gain, information gain and degrees of freedom for a signal. These metrics are all functions of the singular values of the sensitivity matrix that links emissions and observations in the variational framework.Weillustrate the application of the methodology in the case of Santiago (33.58S, 70.58W, 500ma.s.l.), a city of ca. 7 million inhabitants with significant pollution levels. Wedeem information gain as the best of the above indicators for this case.Wethen quantify the actual evolution of Santiago’s network and compare it with the optimal configuration suggested by our methodology and with results previously obtained using a statistical approach. The application is restricted to diurnal and summer conditions, for which the dispersion model shows a good agreement with observations. The current method offers advantages in that it allows extending a network to include new sites, and it explicitly considers the effects of dispersion patterns, and desired weighting functions such as emission fluxes and population density. We find that Santiago’s air quality has improved two-fold since 1988, regarding CO under diurnal summer conditions. Still, according to our results, the current configuration could be improved by integrating more suburban stations in the southwest of the basin. Reuters ISIantarctic oscillation, el niño-southern oscillation, nothofagus pumilio, tree growth, treeline, atmospheric pressure, atmospheric temperature, climate change, climatology, global warming, nickel, oceanography, surface waters, nothofagus, southern oscillation, forestry, annual variation, chronology, deciduous tree, el nino-southern oscillation, growing season, growth rate, sea surface temperature, tree ring, growth, oscillation, trees, patagonia
Modelación y Sistemas de Observación2015Arias, P. A., Fu, R., Vera, C., & Rojas, M.A correlated shortening of the North and South American monsoon seasons in the past few decadesClimate Dynamics10.1007/s00382-015-2533-1Disentangling the roles of paleofires and explosive volcanism from climatic drivers of past vegetation change is a subject insufficiently addressed in the paleoecological literature. The coastal region of the Chiloé Continental sector of northwestern Patagonia is ideal in this regard considering its proximity to active eruptive centers and the possibility of establishing comparisons with more distal, upwind sites where volcanic influence is minimal. Here we present a fine-resolution pollen and macroscopic charcoal record from Lago Teo with the aim of documenting the local vegetation and climate history, and assessing the role of disturbance regimes as drivers of vegetation change during the last ∼10,000 years. The Lago Teo record shows a conspicuous warm/dry interval between ∼7500 and 10,000 cal yrs BP followed by a cooling trend and increase in precipitation that has persisted until the present, in agreement with previous studies in the region and interpretations of past southern westerly wind activity at multi-millennial scales. The presence of 26 tephras throughout the record allows examination of the relationship between explosive volcanism and vegetation change under contrasting climatic states of the Holocene. We found consistent statistically significant increases in Tepualia stipularis after tephra deposition over the last 10,000 years, in Eucryphia/Caldcluvia between 7500 and 10,000 cal yrs BP and in Hydrangea over the last 7500 years. Our results indicate a primary role of climate change as driver of long-term vegetation change and as a modulator of vegetation responses to volcanic disturbance at multidecadal and centennial timescales. is.11-12Thomson Reuters ISIcross-equatorial flow, global warming, north american monsoon, north atlantic subtropical high, south american monsoon, southern amazon wet season, annual variation, atlantic multidecadal oscillation, decadal variation, el nino-southern oscillation, hadley cell, monsoon, sea surface temperature, wet season, amazonia
Dinámica del Clima2015Boisier, J. P., Ciais, P., Ducharne, A., & Guimberteau, M.Projected strengthening of Amazonian dry season by constrained climate model simulationsNature Climate Change10.1038/nclimate2658In the framework of the World Meteorological Organisation's Sand and Dust Storm Warning Advisory and Assessment System, we evaluated the predictions of five state-of-the-art dust forecast models during an intense Saharan dust outbreak affecting western and northern Europe in April 2011. We assessed the capacity of the models to predict the evolution of the dust cloud with lead times of up to 72 h using observations of aerosol optical depth (AOD) from the AErosol RObotic NETwork (AERONET) and the Moderate Resolution Imaging Spectroradiometer (MODIS) and dust surface concentrations from a ground-based measurement network. In addition, the predicted vertical dust distribution was evaluated with vertical extinction profiles from the Cloud and Aerosol Lidar with Orthogonal Polarization (CALIOP). To assess the diversity in forecast capability among the models, the analysis was extended to wind field (both surface and profile), synoptic conditions, emissions and deposition fluxes. Models predict the onset and evolution of the AOD for all analysed lead times. On average, differences among the models are larger than differences among lead times for each individual model. In spite of large differences in emission and deposition, the models present comparable skill for AOD. In general, models are better in predicting AOD than near-surface dust concentration over the Iberian Peninsula. Models tend to underestimate the long-range transport towards northern Europe. Our analysis suggests that this is partly due to difficulties in simulating the vertical distribution dust and horizontal wind. Differences in the size distribution and wet scavenging efficiency may also account for model diversity in long-range transport. is.7Thomson Reuters ISIcarbon sequestration, climate modeling, dry season, ecosystem service, global climate, hydrological change, precipitation intensity, rainforest, soil moisture, twenty first century, vulnerability, amazonia
Biogeoquímica; Dinámica del Clima; Modelación y Sistemas de Observación2016Boisier, J. P., Rondanelli, R., Garreaud, R., & Muñoz, F.Anthropogenic and natural contributions to the Southeast Pacific precipitation decline and recent mega-drought in central ChileGeophysical Research Letters10.1002/2015GL067265The effective radiative forcings (including rapid adjustments) and feedbacks associated with an instantaneous quadrupling of the preindustrial CO2 concentration and a counterbalancing reduction of the solar constant are investigated in the context of the Geoengineering Model Intercomparison Project (GeoMIP). The forcing and feedback parameters of the net energy flux, as well as its different components at the top-of-atmosphere (TOA) and surface, were examined in 10 Earth System Models to better understand the impact of solar radiation management on the energy budget. In spite of their very different nature, the feedback parameter and its components at the TOA and surface are almost identical for the two forcing mechanisms, not only in the global mean but also in their geographical distributions. This conclusion holds for each of the individual models despite intermodel differences in how feedbacks affect the energy budget. This indicates that the climate sensitivity parameter is independent of the forcing (when measured as an effective radiative forcing). We also show the existence of a large contribution of the cloudy-sky component to the shortwave effective radiative forcing at the TOA suggesting rapid cloud adjustments to a change in solar irradiance. In addition, the models present significant diversity in the spatial distribution of the shortwave feedback parameter in cloudy regions, indicating persistent uncertainties in cloud feedback mechanisms. ©2014. American Geophysical Union. All Rights Reserved. is.1Thomson Reuters ISIcentral chile, climate change attribution, drought, pacific decadal oscillation, precipitation, southeast pacific, climate models, greenhouse gases, oceanography, precipitation (chemical), rain, rain gages, surface waters, anthropogenic climate changes, greenhouse-gas forcing, large-scale circulation, precipitation trends, sea surface temperature (sst), climate change, anthropogenic effect, climate forcing, climate modeling, ensemble forecasting, greenhouse gas, precipitation intensity, raingauge, regional climate, sea surface temperature, spatiotemporal analysis, trend analysis, uncertainty analysis, chile, pacific ocean, pacific ocean (southeast)
Dinámica del Clima; Modelación y Sistemas de Observación2015Bravo, C., Rojas, M., Anderson, B., Mackintosh, A. N., Sagredo, E., & Moreno, P. I.Modelled glacier equilibrium line altitudes during the mid-Holocene in the southern mid-latitudesClimate of the Past10.5194/cp-11-1575-2015The concept of ecosystem services from landscapes is rapidly gaining momentum as a language to communicate values and benefits to scientists and lay alike. Landscape ecology has an enormous contribution to make to this field, and one could argue, uniquely so. Tools developed or adapted for landscape ecology are being increasingly used to assist with the quantification, modelling, mapping, and valuing of ecosystem services. Several of these tools and methods encased therein are described among the eleven papers presented in this special issue, and their application has the potential to facilitate the management and promotion of services within ecosystems. Papers are associated with each of the four key categories of services that ecosystems provide to humans: supporting, provisioning, regulating, and cultural. The papers represent work conducted in eleven different countries, especially from South America. Each carries a unique approach to address a particular question pertaining to a particular set of ecosystem services. These studies are designed to inform and improve the economic, environmental and social values of the ecosystem services. This knowledge should help to develop new management alternatives for sustaining and planning ecosystems and the services they provide at different scales in space and time. We believe that these papers will create interest and inform management of some potential methods to evaluate ecosystem services at the landscape level with an integrative approach, offering new tools for management and conservation. © 2014 Springer Science+Business Media Dordrecht (outside the USA). is.11Thomson Reuters ISIablation, climate conditions, climate forcing, glacier dynamics, glacier mass balance, holocene, latitude, numerical model, paleoclimate, precipitation assessment, seasonality, soil-vegetation interaction, southern hemisphere, temperature anomaly, new zealand, patagonia, south island
Servicios Ecosistémicos2015Cabezas, J., Galleguillos, M., Valdés, A., Fuentes, J. P., Pérez, C., & Perez-Quezada, J. F.Evaluation of impacts of management in an anthropogenic peatland using field and remote sensing dataEcosphere10.1890/ES15-00232.1During the last decade, the IUCN has developed criteria analogous to the Red List of Threatened Species to perform similar risk assessment on ecosystems, creating the Red List of Ecosystems methodology. One of the most significant challenges for the construction of these lists is the gathering and availability of the information needed to apply the criteria. We present a complement to the IUCN's methodology to assess the threat level to ecosystems, estimating the spatial and temporal quality of the information available in scientific publications. We did this by applying the IUCN criteria to determine the threat level to the sclerophyll ecosystems of central Chile. Spatially explicit studies that identify disturbances in the structure of the vegetation were selected, making it possible to quantify effectively the reduction in the ecosystems' distribution. The spatial and temporal quality of the assessment were estimated as the percentage of the potential ecosystem distribution and the time frame recommended by the IUCN (50 years), that the studies represented for each ecosystem. The application of the methodology allowed the assessment of a high percentage of the ecosystems (85%), which were classified based on the studies with ranges of temporal quality from 30 to 100% and spatial quality from 12 to 100%. If only the assessments with more than medium spatio-temporal quality are considered (> 50%), eight of the 17 evaluated ecosystems are classified in threat categories, which represents 22.9% of the study area. is.12Thomson Reuters ISIcarbon reservoirs, carbon stocks, effects of management, grazing, harvesting, moss, sphagnum, vegetation
Biogeoquímica2015Castro-González, M., & Farías, L.The influence of anoxia and substrate availability on N2O cycling by denitrification in the upper boundary of the oxygen minimum zone off northern ChileJournal of Marine Research10.1357/002224015817391285The 1976-1977 cold-to-warm sea surface temperature (SST) shift in the tropical Pacific Ocean, which has been associated with a phase change of the Pacific Decadal Oscillation (PDO) index, separated a 'La Niña-like' decadal regime from an 'El Niño-like' one. In this article, we analyse the differences of mean of annual and austral-summer (DJF) temperature, precipitation, and sea-level pressure (SLP) over South America (SA) between 1961-1973 and 1978-1990, and explore the occurrence of significant shifts in their time series. Our sources are instrumental records, gridded interpolated data, and reanalyses. Although major regional differences in the intensity of the signal are detected, the climate shift is identified in all variables. In the mid-1970s at annual level, reanalysis SLP data reveal the onset of a step-like anticyclonic circulation anomaly in the southern tip of SA and an abrupt weakening of the Southeast Pacific Subtropical Anticyclone (SEPA). This latter feature may have partly induced the rapid warming observed along the tropical-extratropical west coast of the continent through the weakening of the cold Humboldt current system. An abrupt warming was also detected in surface air temperature (SAT) composites located along the coast of the northern part of SA and in Southeastern SA (SESA). During summer, we found a particularly conspicuous shift-like warming over Southern South America (SSA, comprising Patagonia). Besides, a shift-like increase (decrease) in annual mean precipitation is observed over Central Argentina and in the tropics, to the south (north) of 10°S. In line with previous studies, we conclude that both the interannual (El Niño-Southern Oscillation, ENSO) and the interdecadal (PDO) variability modes seem to have had an incidence in the manifestation of the 1970s climate shift, and that its magnitude appears to be unprecedented during the 20th century, as shown in particular by century-long SAT composites from northern Chile and SSA. is.6Thomson Reuters ISIdenitrification, eastern south pacific ocean, nitrous oxide, oxycline, atmospheric chemistry, dissolved organic carbon, geoaccumulation, nitrification, nitrogen cycle, oxygen, substrate, chile, pacific ocean, pacific ocean (south)
Biogeoquímica2015Castro-González, M., Ulloa, O., & Farías, L.Structure of denitrifying communities reducing N2O at suboxic waters off northern Chile and PerúRevista de Biologia Marina y Oceanografia10.4067/S0718-19572015000100008We present a detailed record from Lago Pichilafquén to unravel the vegetation, climate and disturbance history of the lowlands of northwestern Patagonia (40°S) since 14,500calyrBP. The presence of 30 tephras throughout the record attest for the proximity of the site to active volcanic centres and allows assessment of the role of volcanic disturbance on past vegetation and fire regime shifts. We interpretalternations in dominance between North Patagonian and Valdivian rainforests driven by changes in temperature and precipitation of westerly origin at multi-millennial and millennial timescales. These trends were punctuated by centennial-scale changes, most of which were coeval with or immediately followed the deposition of tephras and/or paleofires. We identify departures of the local vegetation from the regional trend between 2400 and 7100calyrBP, which we interpret as a response of rainforest vegetation and local fire regimes to the disturbance effect of tephra deposition near Lago Pichilafquén. We also find that volcanic disturbance promoted consistent increases in Eucryphia/Caldcluvia within 30 years and paleofires between 60 and 120years following tephra deposition. Comparisons with palynological records having similar span, time resolution and age control suggest that regional climate has played a central role on the establishment, composition and maintenance of temperate rainforests. This influence is overprinted by disturbance regimes at the local and landscape level, driving divergences and heterogeneity especially at times of relatively weak climatic forcing. © 2014 Elsevier Ltd. is.1Thomson Reuters ISIeastern south pacific, nosz gene, oxygen minimum zone, community composition, denitrification, environmental conditions, enzyme, gene, microbial community, nitrifying bacterium, nitrogen oxides, phylogenetics, polymorphism, chile, pacific ocean, pacific ocean (southeast), peru
Biogeoquímica2016Cordova, A. M., Arévalo, J., Marín, J. C., Baumgardner, D., Graciela B. Raga, G. B. R., Pozo, D., … Rondanelli, R.On the Transport of Urban Pollution in an Andean Mountain ValleyAerosol and Air Quality Research10.4209/aaqr.2015.05.0371The El Niño-Southern Oscillation (ENSO) is the main driver of interannual climate extremes in Amazonia and other tropical regions. The current 2015/2016 EN event was expected to be as strong as the EN of the century in 1997/98, with extreme heat and drought over most of Amazonian rainforests. is.3Thomson Reuters ISIandes cryosphere, black carbon, mountain-valley circulations, regional pollution, landforms, urban transportation, cryosphere, mountain valley circulations, particle concentrations, particle pollution, particulate pollution, synoptic conditions, pollution, advection, air mass, atmospheric deposition, concentration (composition), glacier, mountain environment, snowpack, synoptic meteorology, urban pollution, valley, andes, chile, cordillera, metropolitana, paraguay
Dinámica del Clima2016Cuyckens, G. A. E., Christie, D. A., Domic, A. I., Malizia, L. R., & Renison, D.Climate change and the distribution and conservation of the world’s highest elevation woodlands in the South American AltiplanoGlobal and Planetary Change10.1016/j.gloplacha.2015.12.010South America is experiencing rapid change in forest cover, of both native and planted forest. Forest cover loss is primarily attributable to fire, logging, and conversion of native forest to agriculture, pasture, and forest plantations, and types of change vary within and among the many diverse types of forests in South America. Major changes in forest cover and growing policy concerns underscore an urgent need for research on sustainable forest management and water ecosystem services in South America. Differences in land ownership and management objectives create trade-offs between wood production and water ecosystem services from forests. Work is needed to quantify how forest change and management affect ecosystem services, such as wood production versus water provision. Current scientific understanding of forest management effects on water ecosystem services in South America has important limitations, including a scarcity of long-term records and few long-term integrated watershed studies. Industry, government, universities, and local communities should collaborate on integrated applied studies of forests and water. Data archiving and publically available data are required. The creation of national networks and a multi-country South America network to identify and implement common water research protocols, share results, and explore their implications would promote common and well-supported policies. Hydrologists working in South America are well placed to tackle the challenges and opportunities for collaborative research that will maintain the intrinsic values and water ecosystem services provided by South America's forests. 811530160079-87vol.137Thomson Reuters ISImaxent, models, polylepis tarapacana, potential distribution, arid regions, biodiversity, climate models, conservation, ecology, ecosystems, environmental protection, population distribution, biological community, climate change scenarios, conservation values, environmental variables, potential distributions, species distributions, climate change, conservation management, conservation status, ecological modeling, ecosystem management, elevation, geographical distribution, global change, literature review, protected area, shrub, software, twenty first century, woodland, altiplano, rosaceae
Servicios Ecosistémicos2016Delgado-Baquerizo, M., Maestre, F. T., Gallardo, A., Eldridge, D. J., Soliveres, S., Bowker, M. A., Gómez-González, S., … Zaady, E.Human impacts and aridity differentially alter soil N availability in drylands worldwideGlobal Ecology and Biogeography10.1111/geb.12382The responses of carbon dioxide (CO2) and other climate variables to an emission pulse of CO2 into the atmosphere are often used to compute the Global Warming Potential (GWP) and Global Temperature change Potential (GTP), to characterize the response timescales of Earth System models, and to build reduced-form models. In this carbon cycle-climate model intercomparison project, which spans the full model hierarchy, we quantify responses to emission pulses of different magnitudes injected under different conditions. The CO2 response shows the known rapid decline in the first few decades followed by a millennium-scale tail. For a 100 Gt-C emission pulse added to a constant CO2 concentration of 389 ppm, 25 ± 9% is still found in the atmosphere after 1000 yr; the ocean has absorbed 59 ± 12% and the land the remainder (16 ± 14%). The response in global mean surface air temperature is an increase by 0.20 ± 0.12 °C within the first twenty years; thereafter and until year 1000, temperature decreases only slightly, whereas ocean heat content and sea level continue to rise. Our best estimate for the Absolute Global Warming Potential, given by the time-integrated response in CO2 at year 100 multiplied by its radiative efficiency, is 92.5 × 10−15 yr W m−2 per kg-CO2. This value very likely (5 to 95% confidence) lies within the range of (68 to 117) × 10−15 yr W m−2 per kg-CO2. Estimates for time-integrated response in CO2 published in the IPCC First, Second, and Fourth Assessment and our multi-model best estimate all agree within 15% during the first 100 yr. The integrated CO2 response, normalized by the pulse size, is lower for pre-industrial conditions, compared to present day, and lower for smaller pulses than larger pulses. In contrast, the response in temperature, sea level and ocean heat content is less sensitive to these choices. Although, choices in pulse size, background concentration, and model lead to uncertainties, the most important and subjective choice to determine AGWP of CO2 and GWP is the time horizon. is.1Thomson Reuters ISIaridity, depolymerization, global change, human impacts, mineralization, n cycle, anthropogenic effect, arid region, environmental conditions, environmental disturbance, nutrient availability, soil nitrogen, terrestrial ecosystem
Servicios Ecosistémicos2016Díaz-Hormazábal, I., & González, M. E.Spatio-temporal analyses of wildfires in the region of Maule, ChileBosque10.4067/S0717-92002016000100014We report on an episode of extremely low precipitable water vapour (PWV) of approximately 0.1mm with a duration of more than 12 h at European Southern Observatory's Paranal observatory [2635m above sea level (asl)]. Such conditions are more commonly expected at sites at much higher altitude such as ALMA on the Chajnantor plateau (5000m asl) or otherwise particularly dry sites such as locations in Antarctica. We provide a full account ofthe measurements of PWV and other relevant atmospheric parameters. An explanation of the observed conditions is given in terms of the prevailing meteorological pattern. Based on statistical evidence from measurements by VLT spectrographs (UVES and CRIRES) covering more than a decade, we find that PWV <0.2mm can be expected on less than 1 per cent of the nights, while <0.5mm is encountered on 6-7 nights per year (≈2 per cent). The scientificpotential of using this small but significant fraction of observing time is illustrated in the context of service modeSociety. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. is.1Thomson Reuters ISIcauses and origin of fires, fire regime, rotation period
Biogeoquímica2015Farías, L., Besoain, V., & García-Loyola, S.Presence of nitrous oxide hotspots in the coastal upwelling area off central Chile: an analysis of temporal variability based on ten years of a biogeochemical time seriesEnvironmental Research Letters10.1088/1748-9326/10/4/044017We present a preliminary description and taxonomic assignment of the Lamini fossil remains recovered from the paleontological site of Pilauco (late Pleistocene) in southern Chile. Based on metric variables the fossils are temporarily asigned to cf. Hemiauchenia paradoxa Gervais & Ameghino 1880, waiting for new and more diagnostic remains. We present and discuss some taphonomic processes occurring within the site, starting from the study of the marks observed in the surface of the fossils, wich are consistent with the bog environment with occasional fluvial flooding described for the site. is.4Thomson Reuters ISIcentral chile, coastal upwelling, nitrous oxide hotspot, seasonal and inter-annual n2o variability, biogeochemistry, coastal engineering, nitrogen oxides, oxygen, time series, aerobic ammonium oxidation, apparent oxygen utilizations, hot spot, interannual, interannual variability, seasonal variability, time series analysis, atmospheric pollution, biogeochemical cycle, chlorophyll a, denitrification, emission, flux measurement, hypoxia, nitrous oxide, nutrient cycling, oxidation, pollutant source, temporal variation, upwelling, chile
Biogeoquímica2015Fernandez, C., González, M. L., Muñoz, C., Molina, V., & Farías, L.Temporal and spatial variability of biological nitrogen fixation off the upwelling system of central Chile (35-38.5°S)Journal of Geophysical Research: Oceans10.1002/2014JC010410Mineral dust aerosols play a major role in present and past climates. To date, we rely on climate models for estimates of dust fluxes to calculate the impact of airborne micronutrients on biogeochemical cycles. Here we provide a new global dust flux data set for Holocene and Last Glacial Maximum (LGM) conditions based on observational data. A comparison with dust flux simulations highlights regional differences between observations and models. By forcing a biogeochemical model with our new data set and using this model's results to guide a millennial-scale Earth System Model simulation, we calculate the impact of enhanced glacial oceanic iron deposition on the LGM-Holocene carbon cycle. On centennial timescales, the higher LGM dust deposition results in a weak reduction of <10ppm in atmospheric CO2 due to enhanced efficiency of the biological pump. This is followed by a further ∼10ppm reduction over millennial timescales due to greater carbon burial and carbonate compensation. is.5Thomson Reuters ISIdissolved organic matter, nitrogen fixation, upwelling, bacterioplankton, bacterium, bioavailability, community response, data set, heterotrophy, microbial activity, open ocean, oxygen, oxygen minimum layer, phytoplankton, seasonal variation, spatiotemporal analysis, species richness, suboxic conditions, chile, pacific ocean, pacific ocean (south)
Biogeoquímica2015Fink, H. G., Wienberg, C., de Pol-Holz, R., & Hebbeln, D.Spatio-temporal distribution patterns of Mediterranean cold-water corals (Lophelia pertusa and Madrepora oculata) during the past 14,000 yearsDeep Sea Research Part I: Oceanographic Research Papers10.1016/j.dsr.2015.05.006Dust deposition in the Southern Ocean constitutes a critical modulator of past global climate variability, but how it has varied temporally and geographically is underdetermined. Here, we present data sets of glacial-interglacial dust-supply cycles from the largest Southern Ocean sector, the polar South Pacific, indicating three times higher dust deposition during glacial periods than during interglacials for the past million years. Although the most likely dust source for the South Pacific is Australia and New Zealand, the glacial-interglacial pattern and timing of lithogenic sediment deposition is similar to dust records from Antarctica and the South Atlantic dominated by Patagonian sources. These similarities imply large-scale common climate forcings, such as latitudinal shifts of the southern westerlies and regionally enhanced glaciogenic dust mobilization in New Zealand and Patagonia. Reuters ISIdeglaciation to holocene, framework-forming scleractinian cold-water corals, intermediate water masses, mediterranean sub-basins, oceanography, eastern mediterranean sea, holocenes, intermediate waters, levantine intermediate waters, scleractinian, spatiotemporal distributions, subbasins, thermohaline circulations, climate change, colonization, coral, data set, deglaciation, discharge, environmental change, geochronology, growth, holocene, intermediate water, last glacial, meltwater, paleoenvironment, spatiotemporal analysis, thermohaline circulation, water mass, younger dryas, alboran sea, levantine sea, mediterranean sea, strait of sicily, anthozoa, lophelia, lophelia pertusa, madrepora, madrepora oculata, scleractinia, urania
Dinámica del Clima2015García-Plazaola, J. I., Rojas, R., Christie, D. A., & Coopman, R. E.Photosynthetic responses of trees in high-elevation forests: Comparing evergreen species along an elevation gradient in the Central Andes.AoB plants10.1093/aobpla/plv058Numerous ice core records are now available that cover the Last Glacial cycle both in Greenland and in Antarctica. Recent developments in coherent ice core chronologies now enable us to depict with a precision of a few centuries the relationship between climate records in Greenland and Antarctica over the millennial scale variability of the Last Glacial period. Stacks of Greenland and Antarctic water isotopic records nicely illustrate a seesaw pattern with the abrupt warming in Greenland being concomitant with the beginning of the cooling in Antarctica at the Antarctic Isotopic Maximum (AIM). In addition, from the precise estimate of chronological error bars and additional high resolution measurements performed on the EDC and TALDICE ice cores, we show that the seesaw pattern does not explain the regional variability in Antarctic records with clear two step structures occurring during the warming phase of AIM 8 and 12. Our Antarctic high resolution data also suggest possible teleconnections between changes in low latitude atmospheric circulation and Antarctic without any Greenland temperature fingerprint. Reuters ISIhigh mountain plants, light-harvesting, neoxanthin, photosynthesis, xanthophylls, zeaxanthin
Servicios Ecosistémicos2015González, M. E., & Lara, A.Large fires in the Andean Araucaria forests: when a natural ecological process becomes a threatOryx10.1017/S0030605315000599The understanding of the long-term variation of large rivers streamflow with a high economic and social relevance is necessary in order to improve the planning and management of water resources in different regions of the world. The Baker River has the highest mean discharge of those draining both slopes of the Andes South of 20°S and it is among the six rivers with the highest mean streamflow in the Pacific domain of South America (1100m3s-1 at its outlet). It drains an international basin of 29,000km2 shared by Chile and Argentina and has a high ecologic and economic value including conservation, tourism, recreational fishing, and projected hydropower. This study reconstructs the austral summer - early fall (January-April) streamflow for the Baker River from Nothofagus pumilio tree-rings for the period 1765-2004. Summer streamflow represents 45.2% of the annual discharge. The regression model for the period (1961-2004) explains 54% of the variance of the Baker River streamflow (R2adj=0.54). The most significant temporal pattern in the record is the sustained decline since the 1980s (τ=-0.633, p=1.0144*10-5 for the 1985-2004 period), which is unprecedented since 1765. The Correlation of the Baker streamflow with the November-April observed Southern Annular Mode (SAM) is significant (1961-2004, r=-0.55, p is.3Thomson Reuters ISI
Servicios Ecosistémicos2015González, M. E., Donoso, P. J., & Szejner, P.Tree-fall gaps and patterns of tree recruitment and growth in Andean old-growth forests in south-central ChileBosque10.4067/S0717-92002015000300006Growing concern about the loss of ecosystem services (ES) promotes their spatial representation as a key tool for the internalization of the ES framework into land use policies. Paradoxically, mapping approaches meant to inform policy decisions focus on the magnitude and spatial distribution of the biophysical supply of ES, largely ignoring the social mechanisms by which these services influence human wellbeing. If social mechanisms affecting ES demand, enhancing it or reducing it, are taken more into account, then policies are more effective. By developing and applying a new mapping routine to two distinct socio-ecological systems, we show a strong spatial uncoupling between ES supply and socio-ecological vulnerability to the loss of ES, under scenarios of land use and cover change. Public policies based on ES supply might not only fail at detecting priority conservation areas for the wellbeing of human societies, but may also increase their vulnerability by neglecting areas of currently low, but highly valued ES supply. is.3Thomson Reuters ISIgap-makers, gap-phase regeneration mode, growth releases, regeneration dynamics
Servicios Ecosistémicos2015González, M. E., Szejner, P., Donoso, P. J., & Salas, C.Fire, logging and establishment patterns of second-growth forests in south-central Chile: implications for their management and restorationCiencia e investigación agraria10.4067/S0718-16202015000300011Predicting how the El Niño/Southern Oscillation (ENSO) will change with global warming is of enormous importance to society 1-4. ENSO exhibits considerable natural variability at interdecadal-centennial timescales5. Instrumental records are too short to determine whether ENSO has changed6 and existing reconstructions are often developed without adequate tropical records. Here we present a seven-century-long ENSO reconstruction based on 2,222 tree-ring chronologies from both the tropics and mid-latitudes in both hemispheres. The inclusion of tropical records enables us to achieve unprecedented accuracy, as attested by high correlations with equatorial Pacific corals 7-8 and coherent modulation of global teleconnections that are consistent with an independent Northern Hemisphere temperature reconstruction9. Our data indicate that ENSO activity in the late twentieth century was anomalously high over the past seven centuries, suggestive of a response to continuing global warming. Climate models disagree on the ENSO response to global warming 3-4, suggesting that many models underestimate the sensitivity to radiative perturbations. Illustrating the radiative effect, our reconstruction reveals a robust ENSO response to large tropical eruptions, with anomalous cooling in the east-central tropical Pacific in the year of eruption, followed by anomalous warming one year after. Our observations provide crucial constraints for improving climate models and their future projections. is.3Thomson Reuters ISIdisturbances, ecological restoration, nothofagus, secondary succession
Modelación y Sistemas de Observación2015Henriquez, A., Osses, A., Gallardo, L., & Diaz Resquin, M.Analysis and optimal design of air quality monitoring networks using a variational approachTellus B: Chemical and Physical Meteorology10.3402/tellusb.v67.25385Socio-economic and environmental changes are well known causes of demographic collapse of agrarian cultures. The collapse of human societies is a complex phenomenon where historical and cultural dimensions play a key role, and they may interact with the environmental context. However, the importance of the interaction between socio-economic and climatic factors in explaining possible breakdowns in Native American societies has been poorly explored. The aim of this study is to test the role of socio-economic causes and rainfall variability in the collapse suffered by the Aymara people of the semiarid Andean region of Tarapacá during the period 1820–1970. Our motivation is to demonstrate that simple population dynamic models can be helpful in understanding the causes and relative importance of population changes in Andean agro-pastoral societies in responses to socio-environmental variability. Simple logistic models that combine the effects of external socio-economic causes and past rainfall variability (inferred from Gross Domestic Product [GDP] and tree-rings, respectively) were quite accurate in predicting the sustained population decline of the Aymara people. Our results suggest that the depopulation in the semiarid Tarapacá province was caused by the interaction among external socio-economic pressures given by the economic growth of the lowlands and demands for labor coupled with a persistent decline in rainfall. This study constitutes an example of how applied ecological knowledge, in particular the application of the logistic equation and theories pertaining to nonlinear population dynamics and exogenous perturbations, can be used to better understand major demographic changes in human societies. is.1Thomson Reuters ISIair pollution, optimal network design, variational framework, air quality, atmospheric pollution, carbon emission, carbon monoxide, dispersion, network design, optimization, pollution monitoring, tracer, urban pollution, variance analysis, chile, metropolitana, santiago metropolitana
Dinámica del Clima2015Henríquez, W. I., Moreno, P. I., Alloway, B. V., & Villarosa, G.Vegetation and climate change, fire-regime shifts and volcanic disturbance in Chiloé Continental (43°S) during the last 10,000 yearsQuaternary Science Reviews10.1016/j.quascirev.2015.06.017The Valdivian rainforest ecoregion in Chile (35°-48°S) has a high conservation priority worldwide. These forests are also keys for social welfare as a result of their supply of timber as well as ecosystem services. Forests in the ecoregion have been extensively converted to fast growing Pinus radiata and Eucalyptus spp. plantations for timber production promoted by public policies and timber companies. This study describes the results of detailed measurements of hydrology and stream water chemistry in eight small watersheds in south central Chile, subjected to replacement of native temperate rainforest by exotic Eucalyptus plantations. In this system, watersheds have streamside buffers of native forest (SNFW) with varying widths. Results indicate that retention of SNFW counteracts hydrologic effects of Eucalyptus plantations, which are widely known to reduce water yields. A 1.4% rate of increase of the run-off coefficient for each metre of increase of SNFW was observed. In addition, a decrease in the concentrations of total nitrogen, dissolved inorganic nitrogen (DIN), nitrate-N, and different sized fractions of particulate organic matter were found in streams draining these plantations as a function of increasing SNFW. Streamside buffer widths of 17-22m for total nitrogen and DIN concentrations and ≥36m for sediments were required to provide comparable values to reference watersheds (100% native forest). The findings from this study suggest that SNFW may significantly reduce adverse effects from exotic species forestry plantations on water provision in an area of south central Chile where exotic forest plantations are rapidly expanding. © 2015 John Wiley Reuters ISIchiloé continental, northwestern patagonia, temperate rainforest, volcanic disturbance, charcoal, explosives, submarine geophysics, vegetation, volcanoes, disturbance regime, explosive volcanism, patagonia, southern westerly winds, vegetation change, vegetation response, climate change, climate variation, community response, environmental disturbance, evergreen tree, fire history, holocene, long-term change, palynology, rainforest, temperate environment, tephra, terrestrial ecosystem, vegetation history, volcanism, chile, chiloe island, los lagos, chilo
Biogeoquímica; Modelación y Sistemas de Observación2015Lambert, F., Tagliabue, A., Shaffer, G., Lamy, F., Winckler, G., Farías, L.,Gallardo, L., de Pol-Holz, R.Dust fluxes and iron fertilization in Holocene and Last Glacial Maximum climatesGeophysical Research Letters10.1002/2015GL064250Biodiversity is considered to be an essential element of the Earth system, driving important ecosystem services. However, the conservation of biodiversity in a quickly changingworld is a challenging task which requires cost- efficient and precise monitoring systems. In the present study, the suitability of airborne discrete-return LiDAR data for the mapping of vascular plant species richness within a Sub-Mediterranean second growth native forest ecosystemwas examined. The vascular plant richness of four different layers (total, tree, shrub andherb richness) was modeled using twelve LiDAR-derived variables. As species richness values are typically count data, the cor- responding asymmetry and heteroscedasticity in the error distribution has to be considered. In this context,we compared the suitability of randomforest (RF) and a Generalized Linear Model (GLM)with a negative binomial error distribution. Both models were coupled with a feature selection approach to identify the most relevant LiDAR predictors and keep the models parsimonious. The results of RF and GLM agreed that the three most im- portant predictors for all four layers were altitude above sea level, standard deviation of slope and mean canopy height. Thiswas consistent with the preconception of LiDAR's suitability for estimating species richness,which is its capacity to capture three types of information: micro-topographical, macro-topographical and canopy struc- tural. Generalized LinearModels showed higher performances (r2: 0.66, 0.50, 0.52, 0.50; nRMSE: 16.29%, 19.08%, 17.89%, 21.31% for total, tree, shrub and herb richness respectively) than RF (r2: 0.55, 0.33, 0.45, 0.46; nRMSE: 18.30%, 21.90%, 18.95%, 21.00% for total, tree, shrub and herb richness, respectively). Furthermore, the results of the best GLMweremore parsimonious (three predictors) and less biased than the best RFmodels (twelve pre- dictors). We think that this is due to the mentioned non-symmetric error distribution of the species richness values, which RF is unable to properly capture. Fromanecological perspective, thepredicted patterns agreedwell with theknown vegetationcomposition of the area. We found especially high species numbers at low elevations and along riversides. In these areas, overlap- ping distributions of thermopile sclerophyllos species,water demanding Valdivian evergreen species and species growing in Nothofagus obliqua forests occur. The three main conclusions of the study are: 1) appropriatemodel selection is crucialwhenworkingwith biodiver- sitycountdata; 2) the applicationofRFfordatawithnon-symmetricerrordistributions isquestionable; and3) struc- tural and topographic information derived fromLiDAR data is useful for predicting local plant species richness. © is.14Thomson Reuters ISIatmospheric co2, carbon cycle, dust, iron fertilization, lgm, paleoclimate, biogeochemistry, deposition, glacial geology, iron, atmospheric co, carbon cycles, paleoclimates, climate models, carbon dioxide, carbonate, comparative study, data set, holocene, last glacial maximum, numerical model, timescale
Modelación y Sistemas de Observación2015Landais, A., Masson-Delmotte, V., Stenni, B., Selmo, E., Roche, D. M., Jouzel, J., Lambert, F., … Popp, T.A review of the bipolar see-saw from synchronized and high resolution ice core water stable isotope records from Greenland and East AntarcticaQuaternary Science Reviews10.1016/j.quascirev.2015.01.031Numerous ice core records are now available that cover the Last Glacial cycle both in Greenland and in Antarctica. Recent developments in coherent ice core chronologies now enable us to depict with a precision of a few centuries the relationship between climate records in Greenland and Antarctica over the millennial scale variability of the Last Glacial period. Stacks of Greenland and Antarctic water isotopic records nicely illustrate a seesaw pattern with the abrupt warming in Greenland being concomitant with the beginning of the cooling in Antarctica at the Antarctic Isotopic Maximum (AIM). In addition, from the precise estimate of chronological error bars and additional high resolution measurements performed on the EDC and TALDICE ice cores, we show that the seesaw pattern does not explain the regional variability in Antarctic records with clear two step structures occurring during the warming phase of AIM 8 and 12. Our Antarctic high resolution data also suggest possible teleconnections between changes in low latitude atmospheric circulation and Antarctic without any Greenland temperature fingerprint. Reuters ISIbipolar seesaw, dansgaard oeschger events, ice cores, water isotopes, glacial geology, isotopes, atmospheric circulation, dansgaard-oeschger events, high-resolution measurements, ice core, regional variability, water isotope, water stable isotopes, ice, chronology, dansgaard-oeschger cycle, last glacial, literature review, stable isotope, antarctica, arctic, east antarctica, greenland
Servicios Ecosistémicos2016Lopatin, J., Dolos, K., Hernández, H. J., Galleguillos, M., & Fassnacht, F. E.Comparing Generalized Linear Models and random forest to model vascular plant species richness using LiDAR data in a natural forest in central ChileRemote Sensing of Environment10.1016/j.rse.2015.11.029The Antarctic Intermediate Water (AAIW) is a key player in global-scale oceanic overturning processes and an important conduit for heat, fresh water, and carbon transport. The AAIW past variability is poorly understood mainly due to the lack of sedimentary archives at intermediate water depths. We present records of benthic stable isotopes from sediments retrieved with the seafloor drill rig MARUM-MeBo at 956 m water depth off northern Chile (GeoB15016, 27°29.48′S, 71°07.58′W) that extend back to 970 ka. The sediments at this site are presently deposited at the boundary between AAIW and Pacific Deep Water (PDW). For previous peak interglacials, our results reveal similar benthic δ13C values at site GeoB15016 and of a newly generated stack of benthic δ13C from various deep Pacific cores representing the "average PDW." This suggests, unlike today, the absence of AAIW at the site and the presence of nearly pure PDW. In contrast, more positive δ13C values at site GeoB15016 compared to the stack imply a considerable AAIW contribution during cold phases of interglacials and especially during glacials. Besides, we used three short sediment cores to reconstruct benthic δ13C values from the AAIW core during the last glacial and found a δ13C signature similar to today's. Assuming that this was the case also for the past 970 kyr, we demonstrate that sea level changes and latitudinal migrations of the AAIW formation site can only account for about 50% of the full range of past δ13C increases at site GeoB15016 during cold periods. Other processes that could explain the remaining of the positive δ13C anomalies are increases in glacial AAIW production and/or deeper convection of the AAIW with respect to preceding interglacials. Key Points Absence of AAIW off northern Chile during past peak interglacial periods Increase advection of AAIW to the northern Chilean margin during cold periods Present and LGM AAIW production similar and the highest since 970 ka ©2013. American Geophysical Union. All Rights Reserved. Reuters ISIalpha-diversity, bootstrap validation, glm, lidar data, random forest, species richness, biodiversity, decision trees, ecology, ecosystems, errors, forestry, maximum likelihood, optical radar, plants (botany), sea level, statistical methods, random forests, population distribution, bootstrapping, data assimilation, forest ecosystem, lidar, numerical model, topographic mapping, vascular plant, vegetation mapping, chile, nothofagus obliqua, tracheophyta
Biogeoquímica2016Masotti, I., Belviso, S., Bopp, L., Tagliabue, A., & Bucciarelli, E.Effects of light and phosphorus on summer DMS dynamics in subtropical waters using a global ocean biogeochemical modelEnvironmental Chemistry10.1071/EN14265Despite the great number and variety of glaciers in southern South America, in situ glacier mass-balance records are extremely scarce and glacier–climate relationships are still poorly understood in this region. Here we use the longest (>  35 years) and most complete in situ mass-balance record, available for the Echaurren Norte glacier (ECH) in the Andes at  ∼  33.5° S, to develop a minimal glacier surface mass-balance model that relies on nearby monthly precipitation and air temperature data as forcing. This basic model is able to explain 78 % of the variance in the annual glacier mass-balance record over the 1978–2013 calibration period. An attribution assessment identified precipitation variability as the dominant forcing modulating annual mass balances at ECH, with temperature variations likely playing a secondary role. A regionally averaged series of mean annual streamflow records from both sides of the Andes between  ∼  30 and 37° S is then used to estimate, through simple linear regression, this glacier's annual mass-balance variations since 1909. The reconstruction model captures 68 % of the observed glacier mass-balance variability and shows three periods of sustained positive mass balances embedded in an overall negative trend over the past 105 years. The three periods of sustained positive mass balances (centered in the 1920s–1930s, in the 1980s and in the first decade of the 21st century) coincide with several documented glacier advances in this region. Similar trends observed in other shorter glacier mass-balance series suggest that the Echaurren Norte glacier reconstruction is representative of larger-scale conditions and could be useful for more detailed glaciological, hydrological and climatological assessments in this portion of the Andes. is.2Thomson Reuters ISIglobal modelling, sargasso sea, solar radiation dose., biogeochemical cycle, chlorophyll, concentration (composition), dimethylsulfide, dose-response relationship, emission, environmental modeling, global ocean, gyre, light effect, phosphorus, solar radiation, stratification, subtropical region, atlantic ocean, atlantic ocean (north)
Servicios Ecosistémicos2015Miranda, A., Altamirano, A., Cayuela, L., Pincheira, F., & Lara, A.Different times, same story: Native forest loss and landscape homogenization in three physiographical areas of south-central of ChileApplied Geography10.1016/j.apgeog.2015.02.016The occurrence of a summer DMS paradox in the vast subtropical gyres is a strong matter of debate because approaches using discrete measurements, climatological data and model simulations yielded contradictory results. The major conclusion of the first appraisal of prognostic ocean DMS models was that such models need to give more weight to the direct effect of environmental forcings (e.g. irradiance) on DMS dynamics to decouple them from ecological processes. Here, the relative role of light and phosphorus on summer DMS dynamics in subtropical waters is assessed using the ocean general circulation and biogeochemistry model NEMO-PISCES in which macronutrient concentrations were restored to monthly climatological data values to improve the representation of phosphate concentrations. Results show that the vertical and temporal decoupling between chlorophyll and DMS concentrations observed in the Sargasso Sea during the summer months is captured by the model. Additional sensitivity tests show that the simulated control of phosphorus on surface DMS concentrations in the Sargasso Sea is much more important than that of light. By extending the analysis to the whole North Atlantic Ocean, we show that the longitudinal distribution of DMS during summer is asymmetrical and that a correlation between the solar radiation dose and DMS concentrations only occurs in the Sargasso Sea. The lack of a widespread summer DMS paradox in our model simulation as well as in the comparison of discrete and climatological data could be due to the limited occurrence of phosphorus limitation in the global ocean. Reuters ISIchilean temperate forest, deforestation, land use - land cover change, timber plantation, anthropogenic effect, environmental conditions, forest cover, land cover, land use change, protected area, temperate forest, timber, andes, araucania, central valley chile, chile, coastal cordillera
Dimensión Humana; Dinámica del Clima; Modelación y Sistemas de Observación2015Molina, L. T., Gallardo, L., Andrade, M., Baumgardner, D., Borbor- Córdova, M., Bórquez, R., Garreaud, R. D., Huneeus, N., Lambert, F., … Schwarz, J. P.Pollution and its Impacts on the South American CryosphereEarth's Future10.1002/2015EF000311The potential of landscapes to supply multiple benefits to society beyond commodities production has received increasing research and policy attention. Linking the concept of multifunctionality with the ecosystem services (ES) approach offers a promising avenue for producing scientific evidence to inform landscape planning, e.g., about the relative utility of land-sharing and land-sparing. However, the value for decision-making of ES-based multifunctionality assessments has been constrained by a significant conceptual and methodological dispersion. To contribute towards a cohesive framework for landscape multifunctionality, we analyse case studies of joint ES supply regarding ten criteria designed to ultimately answer four aspects: (i) the multifunctionality of what (e.g., landscapes), (ii) the type of multifunctionality (e.g., based on ES synergies), (iii) the procedure of multifunctionality assessments, and (iv) the purpose of multifunctionality. We constructed a typology of methodological approaches based on scores for criteria describing the evaluation method and the level of stakeholder participation in assessments of joint ES supply. Surveyed studies and underlying types of methodological approaches (spatial, socio-spatial, functional, spatio-functional) differed in most criteria. We illustrate the influence of methodological divergence on planning recommendations by comparing two studies employing contrasting approaches (spatial and functional) to assess the joint supply of wildlife habitat and agricultural production in the Argentine Chaco. We distinguish between a pattern-based and process-based multifunctionality, where the latter can only be detected through approaches considering the ecological processes (e.g., ES complementarities) supporting the supply of multiple ES (functional and spatio-functional). Finally, we propose an integrated approach for assessing a socially-relevant process-based multifunctionality. is.12Thomson Reuters ISIair pollution, andes cryosphere, black carbon, climate change, water resources
Dinámica del Clima2015Moreno, P. I., Denton, G. H., Moreno, H., Lowell, T. V., Putnam, A. E., & Kaplan, M. R.Radiocarbon chronology of the last glacial maximum and its termination in northwestern PatagoniaQuaternary Science Reviews10.1016/j.quascirev.2015.05.027The Variability of American Monsoon Systems (VAMOS) Ocean-Cloud-Atmosphere- Land Study (VOCALS) is an international research program focused upon improved understanding and modeling of the southeast Pacific (SEP) climate system on diurnal to inter annual time scales. The SEP is characterized by strong coastal ocean upwelling, the coldest sea surface temperatures (SST) at comparable latitudes, the planet's most extensive subtropical stratocumulus deck, and a high and steep cordillera to the east. The VOCALS program is built on several research activities in SEP climate research (Mechoso and Wood 2010). The preceding Eastern Pacific Investigation of Climate Processes in the Coupled Ocean-Atmosphere System (EPIC) provided important insight on the intertropical convergence zone (ITCZ)/cold-tongue complex and marine boundary layer (MBL) clouds over the SEP. Reuters ISIheinrich stadial 1, last glacial maximum, last glacial termination, licán ignimbrite, llanquihue moraines, north patagonian rainforests, northwestern patagonia, nothofagus rise, southern mid-latitudes, geochronology, oceanography, ignimbrites, last glacial terminations, midlatitudes, nothofagus, patagonia, glacial geology, chronology, deglaciation, evergreen forest, glacial-interglacial cycle, glacier retreat, heinrich event, holocene, ignimbrite, interstadial, intertropical convergence zone, meridional circulation, midlatitude environment, moraine, radiocarbon dating, rainforest, southern hemisphere, temperate environment, temperature gradient, warming, westerly, andes, atlantic ocean, atlantic ocean (north), new zealand, pacific ocean, south island, southern alps, langat virus
Dimensión Humana2015Nahuelhual, L., Laterra, P., Villarino, S., Mastrángelo, M., Carmona, A., Jaramillo, A., … Burgos, N.Mapping of ecosystem services: Missing links between purposes and proceduresEcosystem Services10.1016/j.ecoser.2015.03.005The understanding of the spatial and temporal patterns in land use and land cover (LULC) change is a key issue for conservation efforts. In the Chilean hotspot, different studies have attempted to understand variations of LULC change. Nevertheless, a broader understanding of common patterns and variability of LULC over the entire range of the hotspot is lacking. We performed a complete review of the different studies reporting LULC changes and performed a joint analysis of their results using an integrated comprehensive approach. We related the variation of LULC change to latitude, time period and vascular plant richness using generalized linear models. Overall, there were nine studies, which covered 36.5 % of the study area, and reported the loss of 19 % of native forest (782,120 ha) between 1973 and 2011. The highest net forest loss was observed in the 1970–1990 period. This decreased in the 1990–2000 period and rose again in the 2000–2010 period. This result reveals a continuous forest loss in the last 40 years. Conversion of native forest to shrublands is the most important contributor to net native forest loss, accounting for 45 % of the loss. However, in the area of greatest species richness native forests are mainly converted to exotic tree plantations. Chilean forestry model has proved successful in expanding exotic tree plantation, but so far it has not been compatible with native forest conservation and restoration. It is imperative to design a new forestry policy to assure the conservation of one of the most unique biodiversity hotspots worldwide. Reuters ISIcascade model, decision-making, ecosystem services framework, ecosystem services mapping
Dinámica del Clima2015Neukom, R., Rohrer, M., Calanca, P., Salzmann, N., Huggel, C., Acuña, D., Christie, D. A., … Morales, M. S.Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000-2100Environmental Research Letters10.1088/1748-9326/10/8/084017Temperate forest represents the smallest area among the main world's forest biomes, but is one of those most threatened by forest loss. Chile contains most of the temperate forest in South America and more than half of the temperate forest in the southern hemisphere. Chilean temperate forest is considered to be one of the world's biodiversity hotspots. In this study we assessed the rate of land use and land cover (LULC) change over time, identified the main LULCs replacing native forest, and described how changes have evolved in contrasting physiographical conditions and through different historical phases of the landscape over the last 40 years. To achieve this, we analysed LULC change with particular focus on forest cover in three areas representing different physiographical conditions and histories of human occupation in the Araucanía Region of Chile, namely the Central Valley, the Coastal range, and the Andean range. We found substantial differences in temporal and intra-regional patterns of forest loss and LULC change. In the Central Valley, forest loss started long ago, and the area occupied by native forest nowadays is less than 5% of the landscape. In the Coastal range, rapid land cover change has taken place since 1973, with an increasing rate of forest loss over time. We detected a similar but less intense pattern in the forests of the Andean range. Overall, the general pattern points to a process of landscape homogenization in all three physiographical areas. Exotic tree plantations have spread over large geographical areas, becoming the dominant land cover. Land cover change in the Araucanía Region reflects a model of change in which areas with better environmental conditions and accessibility are occupied first for productive activities. As the availability of suitable areas for the expansion of productive activities diminishes, these activities start to move into physiographical areas which were previously “protected” by adverse environmental conditions or poor accessibility. This model of production growth could lead to the complete deforestation of areas outside national protected areas, and other areas which still remain inaccessible due to technological restrictions on exploitation. is.8Thomson Reuters ISIcentral andes, climate change, climate projections, paleoclimate, precipitation, south america, climate models, gas emissions, greenhouse gases, ice control, precipitation (chemical), precipitation (meteorology), trees (mathematics), uncertainty analysis, climate projection, instrumental measurements, paleoclimates, pre-industrial conditions, precipitation reconstruction, precipitation variability, industrial emissions, climate modeling, glacier retreat, greenhouse effect, greenhouse gas, hydrological cycle, ice core, mountain region, precipitation (climatology), proxy climate record, reconstruction, troposphere, twenty first century, zonal wind, andes, cuzco peru, peru, quelccaya ice cap
Dinámica del Clima2015Pino, P., Iglesias, V., Garreaud, R., Cortés, S., Canals, M., Folch, W., … Steenland, K.Chile Confronts its Environmental Health Future After 25 Years of Accelerated GrowthAnnals of Global Health10.1016/j.aogh.2015.06.008The response of the tropical climate in the Indian Ocean realm to abrupt climate change events in the North Atlantic Ocean is contentious. Repositioning of the intertropical convergence zone is thought to have been responsible for changes in tropical hydroclimate during North Atlantic cold spells, but the dearth of high-resolution records outside the monsoon realm in the Indian Ocean precludes a full understanding of this remote relationship and its underlying mechanisms. Here we show that slowdowns of the Atlantic meridional overturning circulation during Heinrich stadials and the Younger Dryas stadial affected the tropical Indian Ocean hydroclimate through changes to the Hadley circulation including a southward shift in the rising branch (the intertropical convergence zone) and an overall weakening over the southern Indian Ocean. Our results are based on new, high-resolution sea surface temperature and seawater oxygen isotope records of well-dated sedimentary archives from the tropical eastern Indian Ocean for the past 45,000 years, combined with climate model simulations of Atlantic circulation slowdown under Marine Isotope Stages 2 and 3 boundary conditions. Similar conditions in the east and west of the basin rule out a zonal dipole structure as the dominant forcing of the tropical Indian Ocean hydroclimate of millennial-scale events. Results from our simulations and proxy data suggest dry conditions in the northern Indian Ocean realm and wet and warm conditions in the southern realm during North Atlantic cold spells. is.3Thomson Reuters ISIair pollution, chile, climate change, policy, water pollution, arsenic, drinking water, hepatitis a vaccine, air monitoring, air quality, article, chagas disease, city planning, economic development, environmental economics, environmental exposure, environmental health, environmental impact, environmental monitoring, environmental planning, environmental temperature, follow up, government, greenhouse effect, health hazard, heat, hepatitis a, human, mortality, precipitation, sanitation, scientist, vaccination, waste management, waste water management, workshop, public health, humans
Modelación y Sistemas de Observación2016Rojas, M., Mac-Lean, C., Morales, J., Monares, A., & Fustos, R.Climate change education and literacy at the Faculty of Physical and Mathematical Sciences of the University of ChileInternational Journal of Global Warming10.1504/IJGW.2017.084785Fixed points are fundamental states in any dynamical system. In the case of gene regulatory networks (GRNs) they correspond to stable genes profiles associated to the various cell types. We use Kauffman's approach to model GRNs with random Boolean networks (RBNs). In this paper we explore how the topology affects the distribution of the number of fixed points in randomly generated networks. We also study the size of the basins of attraction of these fixed points if we assume the α-asynchronous dynamics (where every node is updated independently with probability 0 ≤ α ≤ 1). It is well-known that asynchrony avoids the cyclic attractors into which parallel dynamics tends to fall. We observe the remarkable property that, in all our simulations, if for a given RBN with Barabási–Albert topology and α-asynchronous dynamics an initial configuration reaches a fixed point, then every configuration also reaches a fixed point. By contrast, in the parallel regime, the percentage of initial configurations reaching a fixed point (for the same networks) is dramatically smaller. We contrast the results of the simulations on Barabási–Albert networks with the classical Erdös–Rényi model of random networks. Everything indicates that Barabási–Albert networks are extremely robust. Finally, we study the mean and maximum time/work needed to reach a fixed point when starting from randomly chosen initial configurations. pressThomson Reuters ISI
Dinámica del Clima2015Rubio, M., Lissi, E., Gramsch, E., & Garreaud, R.Effect of Nearby Forest Fires on Ground Level Ozone Concentrations in Santiago, ChileAtmosphere10.3390/atmos6121838Questions Is the macrolichen Usnea antarctica a ‘nurse’ species to Antarctic flora? Are positive plant-plant interactions more frequent than negative interactions in Antarctic ecosystems? Are microclimatic modifications by cushions of U. antarctica responsible for the nurse effect? Location Two sites in Antarctica: King George Island, South Shetland (62°11′ S, 58°56′ W; 62°11′ S, 58°59′ W). Methods We evaluated the association of plant species with U. antarctica cushions by recording species growing - in equivalent areas - within and outside U. antarctica cushions. Additionally, we performed transplant experiments with Deschampsia antarctica individuals to assess if U. antarctica cushions enhance plant survival. In both study sites we monitored temperature, moisture and nutrient status of soil outside and within the cushions to provide insights into potential mechanisms underlying possible interactions between U. antarctica and other plant species. Results Eight out of 13 species were positively associated with cushions of the widespread lichen U. antarctica, while only one species (U. aurantiaco-atra) showed a negative association with U. antarctica. Survival of Deschampsia was enhanced when growing associated with U. antarctica cushions. Our results indicate that cushions ameliorated the extreme conditions of Antarctic islands through increased temperature and soil moisture, decreased radiation and evaporative water loss and increased nutrient availability. Conclusions The nurse effect of U. antarctica is verified. Cushions of this macrolichen may be a key component in structuring the Antarctic landscape and maintaining local species richness, and their presence might influence range expansion of other species. is.12Thomson Reuters ISIforest fires, pollutants, santiago of chile, urban ozone, air quality, air quality standards, deforestation, fire hazards, fires, forestry, nitrogen oxides, ozone, pollution, biomass burning emissions, ground level ozone concentration, national air quality standards, urban atmospheres, air pollution, atmospheric plume, atmospheric pollution, biomass burning, concentration (composition), emission inventory, forest fire, urban atmosphere, wind velocity, chile, metropolitana
Modelación y Sistemas de Observación2016Saide, P. E., Mena-Carrasco, M., Tolvett, S., Hernandez, P., & Carmichael, G. R.Air quality forecasting for winter-time PM 2.5 episodes occurring in multiple cities in central and southern ChileJournal of Geophysical Research: Atmospheres10.1002/2015JD023949This article is a review of the science goals and activities initiated within the framework of the Pollution and its Impacts on the South American Cryosphere (PISAC) initiative. Air pollution associated with biomass burning and urban emissions affects extensive areas of South America. We focus on black carbon (BC) aerosol and its impacts on air quality, water availability, and climate, with an emphasis on the Andean cryosphere. BC is one of the key short-lived climate pollutants that is a topic of growing interest for near-term mitigation of these issues. Limited scientific evidence indicates that the Andean cryosphere has already responded to climate change with receding glaciers and snow cover, which directly affect water resources, agriculture, and energy production in the Andean region of South America. Despite the paucity of systematic observations along the Andes, a few studies have detected BC on snow and glaciers in the Andes. These, in addition to existing and projected emissions and weather patterns, suggest a possible contribution of BC to the observed retreat of the Andean cryosphere. Here we provide an overview of the current understanding of these issues from scientific and policy perspectives, and propose strategic expansions to the relevant measurement infrastructure in the region. is.1Thomson Reuters ISIair quality, atmospheric pollution, biomass burning, complex terrain, concentration (composition), episodic event, particle size, particulate matter, pollutant source, pollution monitoring, public health, spatiotemporal analysis, tracer, weather forecasting, winter, chile
Servicios Ecosistémicos2016Swanson F., Jones, J., Crisafulli, C., González, M. E., & Lara, A.Puyehue-Cordón Caulle eruption of 2011: tephra fall and initial forest responses in the Chilean AndesBosque10.4067/S0717-92002016000100009Spatial environmental heterogeneity influences diversity of organisms at different scales. Environmental filtering suggests that local environmental conditions provide habitat-specific scenarios for niche requirements, ultimately determining the composition of local communities. In this work, we analyze the spatial variation of microbial communities across environmental gradients of sea surface temperature, salinity and photosynthetically active radiation and spatial distance in Fildes Bay, King George Island, Antarctica. We hypothesize that environmental filters are the main control of the spatial variation of these communities. Thus, strong relationships between community composition and environmental variation and weak relationships between community composition and spatial distance are expected. Combining physical characterization of the water column, cell counts by flow cytometry, small ribosomal subunit genes fingerprinting and next generation sequencing, we contrast the abundance and composition of photosynthetic eukaryotes and heterotrophic bacterial local communities at a submesoscale. Our results indicate that the strength of the environmental controls differed markedly between eukaryotes and bacterial communities. Whereas eukaryotic photosynthetic assemblages responded weakly to environmental variability, bacteria respond promptly to fine-scale environmental changes in this polar marine system. is.1Thomson Reuters ISIforest disturbance, puyehue-cordón caulle, tephra fall, volcanic disturbance
Biogeoquímica2015Titschack, J., Baum, D., de Pol-Holz, R., López Correa, M., Forster, N., Flögel, S., … Freiwald, A.Aggradation and carbonate accumulation of Holocene Norwegian cold-water coral reefsSedimentology10.1111/sed.12206We examine the timing and magnitude of the last glacial maximum (LGM) and the last glacial termination (LGT) in northwestern Patagonia, situated in the middle latitudes of South America. Our data indicate that the main phase of the LGT began with abrupt warm pulses at 17,800 and 17,100calyrs BP, accompanied by rapid establishment of evergreen temperate rainforests and extensive deglaciation of the Andes within 1000 years. This response shows that South American middle-latitude temperatures had approached average interglacial values by 16,800calyrs BP. The temperature rise in northwestern Patagonia coincides with the beginning of major warming and glacier recession in the Southern Alps of New Zealand at southern mid-latitudes on the opposite side of the Pacific Ocean. From this correspondence, the warming that began at 17,800calyrs BP appears to have been widespread in middle latitudes of the Southern Hemisphere, accounting for at least 75% of the total temperature recovery from the LGM to the Holocene. Moreover, this warming pulse is coeval with the first half of the Heinrich Stadial 1 (HS1) in the North Atlantic region. HS1 featured a decline of North Atlantic meridional overturning circulation, a southward shift of the westerly wind belt in both hemispheres and of the Intertropical Convergence Zone, as well as a weakening of the Asian monsoon. Along with the initiating trigger, identifying the mechanisms whereby these opposing climate signals in the two polar hemispheres interacted -whether through an oceanic or an atmospheric bipolar seesaw, or both- lies at the heart of understanding the LGT. is.7Thomson Reuters ISIaggradation rate, carbonate accumulation rate, cold-water coral carbonate factory, cold-water coral reef, holocene reef development, biology, carbonation, computerized tomography, deposits, ecology, molecular biology, accumulation rates, cold-water corals, continental margin, environmental control, high resolution, holocenes, molecular genetics, sedimentary environment, reefs, accumulation rate, aggradation, carbonate sediment, cold water, coral reef, holocene, preservation, reef formation, atlantic ocean, norway, anthozoa
Biogeoquímica2015Ugalde, P. C., Santoro, C. M., Gayo, E. M., Latorre, C., Maldonado, S., de Pol-Holz, R., & Jackson, D.How Do Surficial Lithic Assemblages Weather in Arid Environments? A Case Study from the Atacama Desert, Northern ChileGeoarchaeology10.1002/gea.21512Late twentieth-century instrumental records reveal a persistent southward shift of the Southern Westerly Winds during austral summer and autumn associated with a positive trend of the Southern Annular Mode (SAM) and contemporaneous with glacial recession, steady increases in atmospheric temperatures and CO2 concentrations at a global scale. However, despite the clear importance of the SAM in the modern/future climate, very little is known regarding its behaviour during pre-Industrial times. Here we present a stratigraphic record from Lago Cipreses (51°S), southwestern Patagonia, that reveals recurrent ∼200-year long dry/warm phases over the last three millennia, which we interpret as positive SAM-like states. These correspond in timing with the Industrial revolution, the Mediaeval Climate Anomaly, the Roman and Late Bronze Age Warm Periods and alternate with cold/wet multi-centennial phases in European palaeoclimate records. We conclude that SAM-like changes at centennial timescales in southwestern Patagonia represent in-phase interhemispheric coupling of palaeoclimate over the last 3,000 years through atmospheric teleconnections. is.4Thomson Reuters ISIarchaeological evidence, arid environment, eolian process, geochronology, geomorphology, holocene, moisture content, taphonomy, weathering rate, wind erosion, atacama desert, chile
Servicios Ecosistémicos2015Urrutia-Jalabert, R., Malhi, Y., & Lara, A.The Oldest , Slowest Rainforests in the World ? Massive Biomass and Slow Carbon Dynamics of Fitzroya cupressoides Temperate Forests in Southern ChilePloS one10.1371/journal.pone.0137569As rainfall in South-Central Chile has decreased in recent decades, local communities and industries have developed an understandable concern about their threatened water supply. Reconstructing streamflows from tree-ring data has been recognized as a useful paleoclimatic tool in providing long-term perspectives on the temporal characteristics of hydroclimate systems. Multi-century long streamflow reconstructions can be compared to relatively short instrumental observations in order to analyze the frequency of low and high water availability through time. In this work, we have developed a Biobío River streamflow reconstruction to explore the long-term hydroclimate variability at the confluence of the Mediterranean-subtropical and the Temperate-humid climate zones, two regions represented by previous reconstructions of the Maule and Puelo Rivers, respectively. In a suite of analyses, the Biobío River reconstruction proves to be more similar to the Puelo River than the Maule River, despite its closer geographic proximity to the latter. This finding corroborates other studies with instrumental data that identify 37.5°S as a latitudinal confluence of two climate zones. The analyzed rivers are affected by climate forcings on interannual and interdecadal time-scales, Tropical (El Niño Southern Oscillation; ENSO) and Antarctic (Southern Annular Mode; SAM). Longer cycles found, around 80-years, are well correlated only with SAM variation, which explains most of the variance in the Biobío and Puelo rivers. This cycle also has been attributed to orbital forcing by other authors. All three rivers showed an increase in the frequency of extreme high and low flow events in the 20th century. The most extreme dry and wet years in the instrumental record (1943-2000) were not the most extreme of the past 400-years reconstructed for the three rivers (1600-2000), yet both instrumental record years did rank in the five most extreme of the streamflow reconstructions as a whole. These findings suggest a high level of natural variability in the hydro-climatic conditions of the region, where extremes characterized the 20th century. This information is particularly useful when evaluating and improving a wide variety of water management models that apply to water resources that are sensitive to agricultural and hydropower industries. is.9Thomson Reuters ISImagnesium, carbon, article, biomass allocation, biomass production, canopy, carbon allocation, carbon dynamics, chile, controlled study, fitzroya cupressoides, forest structure, net primary productivity, nonhuman, rain forest, seasonal variation, soil analysis, species composition, temperate deciduous forest, tree growth, biomass, ecosystem, metabolism, tree, tropic climate, rainforest, trees, tropical climate
Servicios Ecosistémicos2015Urrutia-Jalabert, R., Malhi, Y., Barichivich, J., Lara, A., Delgado-Huertas, A., Rodríguez, C. G., & Cuq, E.Increased water use efficiency but contrasting tree growth patterns in Fitzroya cupressoides forests of southern Chile during recent decadesJournal of Geophysical Research: Biogeosciences10.1002/2015JG003098Araucaria araucana (Araucaria) is a long-lived conifer growing along a sharp west-east biophysical gradient in the Patagonian Andes. The patterns and climate drivers of Araucaria growth have typically been documented on the driest part of the gradient relying on correlations with meteorological records, but the lack of in situ soil moisture observations has precluded an assessment of the growth responses to soil moisture variability. Here, we use a network of 21 tree-ring width chronologies to investigate the spatiotemporal patterns of tree growth through the entire gradient and evaluate their linkages with regional climate and satellite-observed surface soil moisture variability. We found that temporal variations in tree growth are remarkably similar throughout the gradient and largely driven by soil moisture variability. The regional spatiotemporal pattern of tree growth was positively correlated with precipitation (r = 0.35 for January 1920-1974; P < 0.01) and predominantly negatively correlated with temperature (r = −0.38 for January-March 1920-1974; P < 0.01) during the previous growing season. These correlations suggest a temporally lagged growth response to summer moisture that could be associated with known physiological carry-over processes in conifers and to a response to moisture variability at deeper layers of the rooting zone. Notably, satellite observations revealed a previously unobserved response of Araucaria growth to summer surface soil moisture during the current rather than the previous growing season (r = 0.65 for 1979-2000; P < 0.05). This new response has a large spatial footprint across the mid-latitudes of the South American continent (35°-45°S) and highlights the potential of Araucaria tree rings for palaeoclimatic applications. The strong moisture constraint on tree growth revealed by satellite observations suggests that projected summer drying during the coming decades may result in regional growth declines in Araucaria forests and other water-limited ecosystems in the Patagonian Andes. is.12Thomson Reuters ISIcarbon isotopes, carbon sequestration, climate change, co2 fertilization, old-growth forests, tree ring width chronologies, carbon isotope, chronology, coniferous tree, growth rate, old-growth forest, tree ring, water use efficiency, andes, chile, coastal cordillera, fitzroya, fitzroya cupressoides
Biogeoquímica2015Valenzuela, D., Santoro, C. M., Capriles, J. M., Quinteros, M. J., Peredo, R., Gayo, E. M., … Sepúlveda, M.Consumption of animals beyond diet in the Atacama Desert, northern Chile (13,000-410BP): Comparing rock art motifs and archaeofaunal recordsJournal of Anthropological Archaeology10.1016/j.jaa.2015.09.004The climatology and recent trends of low-level coastal clouds at three sites along the northern Chilean coast (18.3°–23.4°S) are documented based upon up to 45 years of hourly observations of cloud type, coverage, and heights. Consistent with the subtropical location, cloud types are dominated by stratocumuli having greatest coverage (>7 oktas) and smaller heights (600–750 m) during the nighttime of austral winter and spring. Meridionally, nighttime cloud fraction and cloud-base heights increase from south to north. Long-term trends in mean cloud cover are observed at all sites albeit with a seasonal modulation, with increasing (decreasing) coverage in the spring (fall). Consistent trend patterns are also observed in independent sunshine hour measurements at the same sites. Cloud heights show negative trends of about 100 m decade−1 (1995–2010), although the onset time of this tendency differs between sites. The positive cloud fraction trends during the cloudy season reported here disagree with previous studies, with discrepancies attributed to differences in datasets used or to methodological differences in data analysis. The cloud-base height tendency, together with a less rapid lowering of the subsidence inversion base height, suggests a deepening of the coastal cloud layer. While consistent with the tendency toward greater low-level cloud cover and the known cooling of the marine boundary layer in this region, these tendencies are at odds with a drying trend of the near-surface air documented here as well. Assessing whether this intriguing result is caused by physical factors or by limitations of the data demands more detailed observations, some of which are currently under way. Reuters ISIarchaeofauna, atacama desert, consumption, rock art, zoomorphic motifs
Servicios Ecosistémicos2016Veblen, T., González, M. E., Stewart, G., Kitzberger, T., & Brunet, J.Tectonic ecology of the temperate forests of South America and New ZealandNew Zealand Journal of Botany10.1080/0028825X.2015.1130726A growing interest in mapping the social value of ecosystem services (ES) is not yet methodologically aligned with what is actually being mapped. We critically examine aspects of the social value mapping process that might influence map outcomes and limit their practical use in decision making. We rely on an empirical case of participatory mapping, for a single ES (recreation opportunities), which involves diverse stakeholders such as planners, researchers, and community representatives. Value elicitation relied on an individual open-ended interview and a mapping exercise. Interpretation of the narratives and GIS calculations of proximity, centrality, and dispersion helped in exploring the factors driving participants’ answers. Narratives reveal diverse value types. Whereas planners highlighted utilitarian and aesthetic values, the answers from researchers revealed naturalistic values as well. In turn community representatives acknowledged symbolic values. When remitted to the map, these values were constrained to statements toward a much narrower set of features of the physical (e.g., volcanoes) and built landscape (e.g., roads). The results suggest that mapping, as an instrumental approach toward social valuation, may capture only a subset of relevant assigned values. This outcome is the interplay between participants’ characteristics, including their acquaintance with the territory and their ability with maps, and the mapping procedure itself, including the proxies used to represent the ES and the value typology chosen, the elicitation question, the cartographic features displayed on the base map, and the spatial scale. is.2Thomson Reuters ISIargentina, chile, disturbance, earthquakes, forest dynamics, landslides, new zealand, volcanism, earthquake event, environmental disturbance, landslide, rainforest, storm surge, succession, tectonic structure, temperate forest, animalia
Dinámica del Clima2015Viale, M., & Garreaud, R.Orographic effects of the subtropical and extratropical Andes on upwind precipitating cloudsJournal of Geophysical Research: Atmospheres10.1002/2014JD023014Land use and cover change (LUCC) is among the most important factors affecting ecosystem services. This study examines the influence of LUCC on recreation and ecotourism opportunities over three decades in southern Chile. An in-depth analysis of the transition matrix was conducted based on Landsat images from 1976, 1985, 1999 and 2007. Main LUCC trajectories were linked to two ecosystem service indicators: (i) Recreation and ecotourism potential, measured in a 0-100 point scale; and (ii) Recreation and ecotourism opportunities, measured in visitors/ha. A total of 900 trajectories occurred in the landscape between 1976 and 2007. The most important trajectories in terms of area, were the recent degradation of old-growth to secondary forest between 1999 and 2007 (23,290 ha; 13.5 % of landscape), and the early clearing of shrublands for agriculture and pasture land between 1976 and 1985 (7,187 ha, 4.2 % of landscape). In turn, the single most influential trajectory on the magnitude of the indicators was early and permanent degradation of old-growth forest to secondary forest. As a result of these landscape changes, recreation and ecotourism opportunities for the entire landscape were reduced from 65,050 persons in 1976 to 25,038 persons in 1985, further declining to 22,346 and 21,608 persons in 1999 and 2007, respectively. This decrease resulted from changes in specific attributes (i.e. emblematic flora and fauna and forest structure) that were affected by forest degradation and fragmentation. These results highlight the substantial impact of LUCC on recreation opportunity decline, which mirrors biodiversity losses in the study area. is.10Thomson Reuters ISIcloud, cloudsat, coastal zone, extratropical environment, front, midlatitude environment, open ocean, orographic effect, orography, precipitation (climatology), satellite data, synoptic meteorology, andes
Dinámica del Clima2015Vuille, M., Franquist, E., Garreaud, R., Sven, W., Casimiro, L., Cáceres, B.Impact of the global warming hiatus on Andean temperatureJournal of Geophysical Research: Atmospheres10.1002/2015JD023126Modeling and mapping of cultural ecosystem services (CES) represents a significant gap in ecosystem service research. A GIS-based methodological framework was developed and applied to map agricultural heritage (AH), understood as a non-divisible combination of three cultural services (dimensions, D): the heritage value associated to a culturally significant species (i.e. Chiloé native potato) (D1); the traditional systems of knowledge of AH keepers (D2); and the social relations among them (D3). The final aim of the study was to provide indicators of the "final" service (AHi, measured in a 0-100 point scale) and its benefits (AHB, measured in US$/ha), capable to display areas where high value farmland was located. In essence, AHi comprised a set of biocultural variables validated and weighted by expert opinion. The experts gave the maximum importance to 5 variables: number of native potato varieties cultivated (D1), use of own seed (D1), form in which cultivation knowledge was acquired by the keeper (D2), exchange of own seed (D3), and number of other potato keepers known (D3). In turn, AHB reflected society's willingness to pay for the nonmaterial benefits of AH conservation. Since these benefits "propagate" across space extending from local to unknown and distant beneficiaries, and the aim was to identify the most valuable areas for their capacity to satisfy a potential demand, AHB was spatialized following the approach of "ascribing" the potential benefits to their "point of provision". Thus the highest values of AHi coincided with the highest values of AHB (US$10.64-8.64 ha-1) a comprised 5608 ha of the landscape, and similarly the lowest values of AHi matched the lowest values of AHB (US$1.69-0.18 ha-1) comprising 13,070 ha of the landscape. © 2014 Elsevier Ltd. is.9Thomson Reuters ISIanticyclone, atmospheric modeling, climate change, coastal zone, cooling, global warming, pacific decadal oscillation, sea surface temperature, spatiotemporal analysis, temperature effect, temperature inversion, andes, pacific ocean, pacific ocean (tropical)
Dinámica del Clima2015LeQuesne, C., Rojas, M., & Christie, D. A.Anillos de crecimiento de Austrocedrus chilensis: un archivo natural del cambio climáticoRevista del Jardin Botánico ChagualAnillos de crecimiento y registro del clima del pasadohttp://www.jardinbotanicochagual.cl31-35vol.12Not indexed
Servicios Ecosistémicos2015Smith-Ramírez, C., González, M. E., Echeverría, C., & Lara, A.Estado actual de la Restauración ecológica en Chile, perspectivas y desafíosAnales del Instituto de la Patagonia10.4067/S0718-686X2015000100002La restauración ecológica es una disciplina que nació hace poco menos de 30 años. En América Latina se encuentra en proceso de formación, siendo Chile uno de los países que ha liderado en algunos aspectos dicho proceso. El objetivo de este documento es hacer una revisión del estado del arte de la Restauración Ecológica (RE) en Chile. Específicamente apuntamos a: i) hacer una breve recopilación de las primeras acciones de restauración ecológica desarrolladas en el país; ii) identificar las acciones de restauración ecológica de ecosistemas forestales que se han realizado o se encuentran en ejecución; iii) identificar las organizaciones que las han llevado a cabo, y sus principales ámbitos de acción; y iv) delinear cuales serían los desafíos y oportunidades de la RE en el país. Encontramos cerca de 60 iniciativas de RE en el país, llevándose a cabo por ONG, gobierno, empresas y universidades. A pesar de ser muchas iniciativas la superficie que abarca cada una de ellas es relativamente pequeña, sin embargo, hay compromisos de ampliarla considerablemente. La RE está siendo enseñada cada vez más en centros de educación superior. Los desafíos apuntan principalmente a generar Planes Nacionales y Regionales de RE que incluyan formas de financiamiento, soluciones pragmáticas e involucramiento social. is.1SciELO
Dimensión Humana2015Urquiza, A., & Morales, B.La observación del problema ambiental en un contexto de diferenciación funcionalRevista Mad10.5354/0718-0527.2015.37324El presente trabajo es fruto de una investigación social cualitativa realizada el año 2014 en el marco del Núcleo Interdisciplinario de Estudios Socioambientales de la Universidad de Chile (NIES) y con el apoyo del Centro de Ciencia del Clima y Resiliencia (CR2). La investigación se centra en el problema ambiental desde tres ámbitos sociales: público, privado y conocimiento experto. El estudio identificó la existencia de tres tipos de obstáculos que dificultarían el diálogo entre los actores que son parte de la discusión, así como el tratamiento del problema socioambiental, estos son: obstáculos a nivel de institucionalidad y normativa vigente; obstáculos a nivel del actuar y de las relaciones entre los actores; y obstáculos que se presentan a nivel de los significados asignados al problema. En el presente artículo se abordan los últimos dos tipos de obstáculos desde una perspectiva sistémico constructivista. Reuters ESCI y Scopus
Dinámica del Clima, Dimensión Humana2016Aldunce, P., Bórquez, R., Adler, C., Blanco, G., & Garreaud, R.Unpacking Resilience for Adaptation: Incorporating Practitioners’ Experiences through a Transdisciplinary Approach to the Case of Drought in ChileSustainability10.3390/su8090905The literature on ecosystem services mapping presents a diversity of procedures whose consistency might question the reliability of maps for decision-making. This study aims at analyzing the correspondence between the purpose of maps (e.g. land use planning) and the procedures used for mapping (e.g. benefit transfer, ecological transfer). Fifty scientific studies published between 2005 and 2012 were selected and analyzed according to 19 variables, applying independence tests over contingency tables, ANOVA and regression analysis. The results show that most studies declared a decision-making purpose (82%), which in 50% of the cases, was land use planning. Only few relationships were found between variables selected to describe the purpose of the maps and those selected to describe the mapping procedures. Thus for example, maps aimed at supporting land use planning did not include any level of stakeholder participation or scenario analysis, as it would have been expected given this purpose. Likewise, maps were based on either economic value or biophysical transfers, regardless of the spatial and temporal scales of mapping. This generally weak relation between map׳s purposes with the used procedures could explain the still restricted incidence of ES on decision-making by limiting the transmission, comparison and synthesis of results. is.9Thomson Reuters ISIadaptation, chile, climate change, drought, knowledge co-production, resilience, transdisciplinarity, urban and regional resilience, adaptive management, analytical framework, bottom-up approach, complexity, ecosystem resilience, education, indigenous knowledge, interdisciplinary approach, participatory approach, urban development, bio bio, concepcion bio bio, los rios chile, metropolitana, valdivia
Servicios Ecosistémicos2016Alvarez-Garreton, C., Ryu, D., Western, A. W., Crow, W. T., Su, C.-H., & Robertson, D. R.Dual assimilation of satellite soil moisture to improve streamflow prediction in data-scarce catchmentsWater Resources Research10.1002/2015WR018429Projected future trends in water availability are associated with large uncertainties in many regions of the globe. In mountain areas with complex topography, climate models have often limited capabilities to adequately simulate the precipitation variability on small spatial scales. Also, their validation is hampered by typically very low station density. In the Central Andes of South America, a semi-arid high-mountain region with strong seasonality, zonal wind in the upper troposphere is a good proxy for interannual precipitation variability. Here, we combine instrumental measurements, reanalysis and paleoclimate data, and a 57-member ensemble of CMIP5 model simulations to assess changes in Central Andes precipitation over the period AD 1000-2100. This new database allows us to put future projections of precipitation into a previously missing multi-centennial and pre-industrial context. Our results confirm the relationship between regional summer precipitation and 200 hPa zonal wind in the Central Andes, with stronger Westerly winds leading to decreased precipitation. The period of instrumental coverage (1965-2010) is slightly dryer compared to pre-industrial times as represented by control simulations, simulations from the past Millennium, ice core data from Quelccaya ice cap and a tree-ring based precipitation reconstruction. The model ensemble identifies a clear reduction in precipitation already in the early 21st century: the 10 year running mean model uncertainty range (ensemble 16-84% spread) is continuously above the pre-industrial mean after AD 2023 (AD 2028) until the end of the 21st century in the RCP2.6 (RCP8.5) emission scenario. Average precipitation over AD 2071-2100 is outside the range of natural pre-industrial variability in 47 of the 57 model simulations for both emission scenarios. The ensemble median fraction of dry years (defined by the 5th percentile in pre-industrial conditions) is projected to increase by a factor of 4 until 2071-2100 in the RCP8.5 scenario. Even under the strong reduction of greenhouse gas emissions projected by the RCP2.6 scenario, the Central Andes will experience a reduction in precipitation outside pre-industrial natural variability. This is of concern for the Central Andes, because society and economy are highly vulnerable to changes in the hydrological cycle and already have to face decreases in fresh water availability caused by glacier retreat. is.7Thomson Reuters ISIdata assimilation, data scarce, satellite rainfall, satellite soil moisture, streamflow prediction, catchments, forecasting, mean square error, moisture, rain, runoff, satellites, soil surveys, soils, stream flow, satellite rainfalls, soil moisture, catchment, correction, correlation, kalman filter, prediction, rainfall, satellite data, semiarid region, streamflow, water flow, australia
Modelación y Sistemas de Observación2016Andrade-Flores, M., Rojas, N., Melamed, M. L., Mayol-Bracero, O. L., Dawidowski, L., Gallardo, L., … Huneeus, N.Fostering a Collaborative Atmospheric Chemistry Research Community in the Latin America and Caribbean RegionBulletin of the American Meteorological Society10.1175/BAMS-D-14-00267.1In this work, we present combined statistical indexes for evaluating air quality monitoring networks based on concepts derived from the information theory and Kullback-Liebler divergence. More precisely, we introduce: (1) the standard measure of complementary mutual information or ‘specificity’ index; (2) a new measure of information gain or ‘representativity’ index; (3) the information gaps associated with the evolution of a network and (4) the normalised information distance used in clustering analysis. All these information concepts are illustrated by applying them to 14 yr of data collected by the air quality monitoring network in Santiago de Chile (33.5 S, 70.5 W, 500 m a.s.l.). We find that downtown stations, located in a relatively flat area of the Santiago basin, generally show high ‘representativity’ and low ‘specificity’, whereas the contrary is found for a station located in a canyon to the east of the basin, consistently with known emission and circulation patterns of Santiago. We also show interesting applications of information gain to the analysis of the evolution of a network, where the choice of background information is also discussed, and of mutual information distance to the classifications of stations. Our analyses show that information as those presented here should of course be used in a complementary way when addressing the analysis of an air quality network for planning and evaluation purposes. is.10Thomson Reuters ISIair quality, climate change, chemistry research, latin america, atmospheric chemistry
Biogeoquímica2016Barrett, B. S., Campos, D. A., Veloso, J. V., & Rondanelli, R.Extreme temperature and precipitation events in March 2015 in central and northern ChileJournal of Geophysical Research: Atmospheres10.1002/2016JD024835The South Pacific region represents the world's largest oceanic water mass and plays a significant role in the earth's climate systems. This region also contains the largest group of island nations, most of whom are dependent on marine resources for their livelihoods. Several of the largest coastal and oceanic gisheries also occur in this region (FAO, 2014). In addition, for the countries associated with the southern Pacific Ocean region, the sea provides significant social, cultural and economic benefits, with many countries being heavily reliant on both coastal and oceanic marine resources (Bell et al., 2013). Increasing coastal populations and climate change are expected to augment human demands on already fully exploited or over-exploited marine resources, threatening both food security and sustainable livelihoods (Bell et al. 2011). Therefore, its imperative that the science that describes and predicts linked biophysical and human systems is understood and developed to meet these needs. Climate change will have many impacts on marine ecosystems, with implications for end users including individuals, local communities, industries and governments. Improved scientific support for policy and management decision-making in the face of these potential impacts is essential. is.9Thomson Reuters ISIair temperature, extreme event, hydrometeorology, precipitable water, precipitation (climatology), streamflow, surface temperature, temperature anomaly, temperature effect, troposphere, water content, atacama, chile, metropolitana, peru
Dinámica del Clima2016Blunden, J., & Arndt, D. S. (Barichivich, J. co-author of Chapter 2 Section 9)State of the Climate in 2015Bulletin of the American Meteorological Society10.1175/2016BAMSStateoftheClimate.1Making accurate estimations of daily and annual Rs fluxes is key for understanding the carbon cycle process and projecting effects of climate change. In this study we used high-frequency sampling (24 measurements per day) of Rs in a temperate rainforest during 1 year, with the objective of answering the questions of when and how often measurements should be made to obtain accurate estimations of daily and annual Rs. We randomly selected data to simulate samplings of 1, 2, 4 or 6 measurements per day (distributed either during the whole day or only during daytime), combined with 4, 6, 12, 26 or 52 measurements per year. Based on the comparison of partial-data series with the full-data series, we estimated the performance of different partial sampling strategies based on bias, precision and accuracy. In the case of annual Rs estimation, we compared the performance of interpolation vs. using non-linear modelling based on soil temperature. The results show that, under our study conditions, sampling twice a day was enough to accurately estimate daily Rs (RMSE  <  10 % of average daily flux), even if both measurements were done during daytime. The highest reduction in RMSE for the estimation of annual Rs was achieved when increasing from four to six measurements per year, but reductions were still relevant when further increasing the frequency of sampling. We found that increasing the number of field campaigns was more effective than increasing the number of measurements per day, provided a minimum of two measurements per day was used. Including night-time measurements significantly reduced the bias and was relevant in reducing the number of field campaigns when a lower level of acceptable error (RMSE  <  5 %) was established. Using non-linear modelling instead of linear interpolation did improve the estimation of annual Rs, but not as expected. In conclusion, given that most of the studies of Rs use manual sampling techniques and apply only one measurement per day, we suggest performing an intensive sampling at the beginning of the study to determine minimum daily and annual frequencies of sampling. is.8Thomson Reuters ISIagriculture, carbon dioxide, carbon monoxide, digital storage, drought, fisheries, greenhouse gases, groundwater, hurricanes, nitrogen oxides, ozone, ozone layer, rain, sea ice, sea level, snow, soil moisture, storms, submarine geophysics, surface measurement, surface properties, surface waters, tropics, water conservation, agricultural productions, global surface temperature, indian summer monsoon rainfall, intra-annual variability, land surface temperature, pre-industrial conditions, precipitation variability, sea surface temperature (sst), atmospheric temperature
Biogeoquímica; Dinámica del Clima; Modelación y Sistemas de Observación2016Bozkurt, D., Rondanelli, R., Garreaud, R., & Arriagada, A.Impact of warmer eastern tropical Pacific SST on the March 2015 Atacama floodsMonthly Weather Review10.1175/MWR-D-16-0041.1We present a detailed record from Lago Lepué to examine vegetation, climate and fire-regime changes since the Last Glacial Maximum (LGM) in central-east Isla Grande de Chiloé (43°S), northwestern Patagonia. Precipitation in this region correlates with the intensity of the southern westerly winds (SWW), allowing reconstruction of past SWW behavior through precipitation-sensitive sensors. Recession from the LGM glacier margins exposed the central-east sector of Isla Grande de Chiloé by 17,800calyrBP, followed by the immediate colonization of pioneer cold-resistant herbs/shrubs and rapid establishment of closed-canopy Nothofagus forests by 17,000calyrBP. Broad-leaved temperate rainforests have persisted since then with compositional changes driven by changes in temperature, hydrologic balance and disturbance regimes. We detect low lake levels and enhanced fire activity between 800-2000, 4000-4300, ∼8000-11,000 and 16,100-17,800calyrBP, implying southward shifts and/or weaker SWW flow that alternated with cold, humid phases with muted fire activity. Covariation in paleoclimate trends revealed by the Lago Lepué record with tropical and Antarctic records since the LGM, suggests that the SWW have been a highly dynamic component of the climate system capable of linking climate changes from low- and high-southern latitudes during the Last Glacial termination and the current interglacial. © 2014 Elsevier Ltd. is.11Thomson Reuters ISIatmosphere-ocean interaction, cutoff lows, el nino, numerical analysis/modeling, precipitation, sea surface temperature, atmospheric temperature, atmospheric thermodynamics, climate change, climate models, floods, precipitation (chemical), precipitation (meteorology), submarine geophysics, surface properties, surface waters, tropics, atmosphere-ocean interactions, cut-off low, sea surface temperature (sst), oceanography, air-sea interaction, extreme event, flood, numerical model, precipitation (climatology), rainfall, atacama desert, chile, pacific ocean, pacific ocean (tropical)
Modelación y Sistemas de Observación2016Brasseur, G. P., & Gallardo, L.Climate Services: Lessons Learned and Future ProspectsEarth's Future10.1002/2015EF000338Paleontological and archaeological sites have frequently been found in open locations of the Intermediate Depression of south-central Chile. This paper presents the results of two field sampling seasons carried out at the Pilauco Site (ca. 39°S) and compares them with those of three well known sites in Chile: Quereo, Tagua-Tagua and Monte Verde, ca. 32°, 34° and 41°S, respectively. Stratigraphic data collected at Pilauco and the resulting radiocarbon age model suggest that before 12,540 ± 90 BP the old Damas River eroded an older volcaniclastic hill, which was followed by a bog formation in an ox-bow lake. The site was developing up to 11,004 ± 186 BP, the date of the youngest vertebrate fossil. Two younger peat beds seal the site. As in Tagua-Tagua and Monte Verde, Gomphotheres are the most represented megafauna. Fossils of Equidae, Camelidae, Cervidae, Mephitidae, Muridae, Myocastoridae and Xenarthra are also found in Pilauco. As a whole, 718 bones, 30 teeth and 11 coprolites represent the extinct and extant vertebrates. Preliminary taphonomic results suggest action of various agents in the bones, i.e. trampling, root etching, abrasion, and carnivore gnawing. The spatial analysis suggests the transfer of smaller anatomical units (e.g. bones of camelids and horses) and the rearrangement of some pieces comparatively large (e.g. gomphothere bones). Similar to the present day north Patagonian landscape, the area where Pilauco site is located had a variety of animal resources, plants and stones in an ecotone between hills, floodplains and wetlands. A total of 101 lithics were recorded: basalt and quartzite were collected from nearby fluvial deposits and dacitic obsidian from the local volcaniclastic deposits. Debitage is the most represented lithic item (75%); cores and marginal edge-trimmed artifacts represented 12 and 13%, respectively. Artifacts and flakes are spatially and temporality associated in the same PB-7 bed with high bone concentrations in some specific areas, between 361 and 424 cm of local altitude. This industry is characterized by a recurrent lithic expedite technology with production of flakes and chips which mastered marginal retouches over the bifacial trimming. This seems to be connected to strategic conditions of high resource diversity, especially of human groups with a high or medium mobility across land. Pilauco represents a site contemporaneous to Monte Verde related as well to the first human occupation in the southern cone of South America, but with higher mammal diversity. is.3Thomson Reuters ISIclimate services, evaluation, international collaboration, climate change, communication network, decision analysis, economic analysis, globalization, planning process, political change, public service, vulnerability
Servicios Ecosistémicos2016Cabezas, J., Galleguillos, M., & Perez-Quezada, J. F.Predicting Vascular Plant Richness in a Heterogeneous Wetland Using Spectral and Textural Features and a Random Forest AlgorithmIEEE Geoscience and Remote Sensing Letters10.1109/LGRS.2016.2532743BACKGROUND: Chile has recently been reclassified by the World Bank from an upper-middle-income country to a high-income country. There has been great progress in the last 20 to 30 years in relation to air and water pollution in Chile. Yet after 25 years of unrestrained growth, there remain clear challenges posed by air and water pollution, as well as climate change. OBJECTIVE: The aim of this study was to review environmental health in Chile. METHODS: In late 2013, a 3-day workshop on environmental health was held in Santiago, Chile, bringing together researchers and government policymakers. As a follow-up to that workshop, here we review the progress made in environmental health in the past 20 to 30 years and discuss the challenges of the future. We focus on air and water pollution and climate change, which we believe are among the most important areas of environmental health in Chile. RESULTS: Air pollution in some cities remains among the highest in the continent. Potable water is generally available, but weak state supervision has led to serious outbreaks of infectious disease and ongoing issues with arsenic exposure in some regions. Climate change modeling in Chile is quite sophisticated, and a number of the impacts of climate change can be reasonably predicted in terms of which areas of the country are most likely to be affected by increased temperature and decreased availability of water, as well as expansion of vector territory. Some health effects, including changes in vector-borne diseases and excess heat mortality, can be predicted. However, there has yet to be an integration of such research with government planning. CONCLUSIONS: Although great progress has been made, currently there are a number of problems. We suspect that the Chilean experience in environmental health may be of some use for other Latin American countries with rapid economic development. is.5Thomson Reuters ISIgray-level co-occurrence matrix (glcm), landsat, peatland, pleiades, remote sensing, textural variables, decision trees, forecasting, wetlands, gray level co occurrence matrix(glcm), forestry
Servicios Ecosistémicos2016Carlón Allende, T., Mendoza, M. E., Pérez-Salicrup, D. R., Villanueva-Díaz, J., & Lara, A.Climatic responses of Pinus pseudostrobus and Abies religiosa in the Monarch Butterfly Biosphere Reserve, Central MexicoDendrochronologia10.1016/j.dendro.2016.04.002The significance and cause of the decline in biomass burning across the Americas after ad 1500 is a topic of considerable debate. We synthesized charcoal records (a proxy for biomass burning) from the Americas and from the remainder of the globe over the past 2000 years, and compared these with paleoclimatic records and population reconstructions. A distinct post-ad 1500 decrease in biomass burning is evident, not only in the Americas, but also globally, and both are similar in duration and timing to ‘Little Ice Age’ climate change. There is temporal and spatial variability in the expression of the biomass-burning decline across the Americas but, at a regional-continental scale, ‘Little Ice Age’ climate change was likely more important than indigenous population collapse in driving this decline. Reuters ISIclimatic variability, dendrochronology, mexico, precipitation, radial growth, temperature, tree-ring growth, climate effect, climate variation, coniferous tree, forest ecosystem, global climate, growth response, precipitation intensity, mexico north america, monarch butterfly biosphere reserve, abies religiosa, danaus plexippus, pinus pseudostrobus
Biogeoquímica2016Cordero, R. R., Damiani, A., Seckmeyer, G., Jorquera, J., Caballero, M., Rondanelli, R., … Laroze, D.The Solar Spectrum in the Atacama DesertScientific Reports10.1038/srep22457Prevailing wind along the west coast of South America is equatorward, driven by the southeast Pacific anticyclone. The wind induces strong coastal upwelling that supports one of the most important fisheries in the world. This region lacks a dense network of in situ observations, so the high resolution (0.313°) NCEP Climate Forecast System Reanalysis is used here to present a synoptic climatology of the coastal wind along the Chile/Peru coast. Covariability between the alongshore pressure gradient and alongshore wind, which was previously identified for synoptic time scales near central Chile, is generalized for the whole coast and over annual time scales. Particular attention is paid to three prominent upwelling regions: Pisco (14.8°S), Punta Lengua de Vaca (30.0°S), and Punta Lavapie (36.4°S). Previous work has identified local maxima at these points but these are embedded in a broader low-level jet that exhibits a marked seasonal cycle of strong wind days due to the migration of the anticyclone and is associated with a shift of both the mean wind and a more frequent recurrence of strong wind events. Alongshore wind near Pisco is normally distributed year-round with a seasonal shift in the mean. Larger variability in the mean and distribution is found at Lavapie, associated with the seasonal change in storm tracks. The synoptic evolution that drives high-wind events at each location is characterized. A midlevel trough and surface cyclone precede wind maxima at each location and are followed by strong midlevel ridging and a strengthened surface anticyclone. Reuters ISI-
Biogeoquímica2016Cornejo D’Ottone, M., Bravo, L., Ramos, M., Pizarro, O., Karstensen, J., Farías, L., … Karp-Boss, L.Biogeochemical characteristics of a long-lived anticyclonic eddy in the eastern South Pacific OceanBiogeosciences10.5194/bg-13-2971-2016This paper investigates the effect of Last Glacial Maximum (LGM) versus high CO2 world boundary condition on the Southern Hemisphere atmospheric circulation, in particular on the strength and latitudinal position of the near surface Southern Westerly Winds (SWW). PMIP2 and PMIP3 experiments, as well as the “abrupt 4 × CO2” simulations from CMIP5, were analyzed. Robust findings include poleward expansion of the Mean Meridional Circulation (MMC) and intensified and poleward-shifted SWW in the 4 × CO2 simulations (consistent with recent observations and 21st century climate change projections); and for the LGM, stronger and southward shifted northern hemisphere MMC, and weakened southern Hadley cell. However, six of the eight LGM simulations show a decrease in the SWW, the other two models simulate the opposite. A critical difference between the models is strong coupling between sea-ice extent, surface temperature gradients, SWW, and Ferrel cell in the two models with stronger and poleward-shifted SWW. is.10Thomson Reuters ISIanticyclone, biogeochemistry, denitrification, mesoscale eddy, nitrous oxide, oceanic circulation, oxygen consumption, oxygen minimum layer, physicochemical property, satellite altimetry, suboxic conditions, water mass, chile, pacific ocean, pacific ocean (south)
Biogeoquímica2016Díez, B., Nylander, J. A. A., Ininbergs, K., Dupont, C. L., Allen, A. E., Yooseph, S., … Bergman, B.Metagenomic Analysis of the Indian Ocean Picocyanobacterial Community: Structure, Potential Function and EvolutionPloS one10.1371/journal.pone.0155757In this paper we assess South American monsoon system (SAMS) variability in the last millennium as depicted by global coupled climate model simulations. High-resolution proxy records for the South American monsoon over this period show a coherent regional picture of a weak monsoon during the Medieval Climate Anomaly and a stronger monsoon during the Little Ice Age (LIA). Due to the small external forcing during the past 1000 years, model simulations do not show very strong temperature anomalies over these two specific periods, which in turn do not translate into clear precipitation anomalies, in contrast with the rainfall reconstructions in South America. Therefore, we used an ad hoc definition of these two periods for each model simulation in order to account for model-specific signals. Thereby, several coherent large-scale atmospheric circulation anomalies are identified. The models feature a stronger monsoon during the LIA associated with (i) an enhancement of the rising motion in the SAMS domain in austral summer; (ii) a stronger monsoon-related upper-tropospheric anticyclone; (iii) activation of the South American dipole, which results in a poleward shift of the South Atlantic Convergence Zone; and (iv) a weaker upper-level subtropical jet over South America. The diagnosed changes provide important insights into the mechanisms of these climate anomalies over South America during the past millennium. is.5Thomson Reuters ISIallophycocyanin, phycocyanin, surface water, chlorophyll, chlorophyll a, chlorophyll b, phycobilisome, sea water, apcab gene, article, bacterial gene, bacterial genome, coastal waters, community structure, cpcab gene, cpeab gene, cyanobacterium, ecological niche, indian ocean, isia gene, metagenomics, microbial community, nonhuman, pcb gene, phylogeny, picocyanobacterium, prochlorococcus, sequence analysis, species diversity, species habitat, synechococcus, chemistry, ecosystem, evolution, genetics, metagenome, microbiology, statistical model, temperature, biological evolution, cyanobacteria, genome, bacterial, likelihood functions, phycobilisomes, seawater
Modelación y Sistemas de Observación2016Escribano, J., Boucher, O., Chevallier, F., & Huneeus, N.Subregional inversion of North African dust sourcesJournal of Geophysical Research: Atmospheres10.1002/2016JD025020The winter time weather variability over the Mediterranean is studied in relation to the prevailing weather regimes (WRs) over the region. Using daily geopotential heights at 700 hPa from the ECMWF ERA40 Reanalysis Project and Cluster Analysis, four WRs are identified, in increasing order of frequency of occurrence, as cyclonic (22.0 %), zonal (24.8 %), meridional (25.2 %) and anticyclonic (28.0 %). The surface climate, cloud distribution and radiation patterns associated with these winter WRs are deduced from satellite (ISCCP) and other observational (E-OBS, ERA40) datasets. The LMDz atmosphere-ocean regional climate model is able to simulate successfully the same four Mediterranean weather regimes and reproduce the associated surface and atmospheric conditions for the present climate (1961-1990). Both observational- and LMDz-based computations show that the four Mediterranean weather regimes control the region’s weather and climate conditions during winter, exhibiting significant differences between them as for temperature, precipitation, cloudiness and radiation distributions within the region. Projections (2021-2050) of the winter Mediterranean weather and climate are obtained using the LMDz model and analysed in relation to the simulated changes in the four WRs. According to the SRES A1B emission scenario, a significant warming (between 2 and 4 °C) is projected to occur in the region, along with a precipitation decrease by 10-20 % in southern Europe, Mediterranean Sea and North Africa, against a 10 % precipitation increase in northern European areas. The projected changes in temperature and precipitation in the Mediterranean are explained by the model-predicted changes in the frequency of occurrence as well as in the intra-seasonal variability of the regional weather regimes. The anticyclonic configuration is projected to become more recurrent, contributing to the decreased precipitation over most of the basin, while the cyclonic and zonal ones become more sporadic, resulting in more days with below normal precipitation over most of the basin, and on the eastern part of the region, respectively. The changes in frequency and intra-seasonal variability highlights the usefulness of dynamics versus statistical downscaling techniques for climate change studies. is.14Thomson Reuters ISIaeronet, aerosol property, atmospheric general circulation model, data assimilation, dust, emission, land use change, modis, optical depth, wind field, arabian peninsula, sahara
Biogeoquímica, Modelación y Sistemas de Observación2016Gallardo, L., Henríquez, A., Thompson, A. M., Rondanelli, R., Carrasco, J., Orfanoz-Cheuquelaf, A., & Velásquez, P.The first twenty years (1994–2014) of ozone soundings from Rapa Nui (27°S, 109°W, 51 m a.s.l.)Tellus B: Chemical and Physical Meteorology10.3402/tellusb.v68.29484Considering the role that higher education institutions (HEIs) play in terms of catalysing change within societies, over the past years, sustainability initiatives within HEIs have flourished worldwide. Likewise, the scientific evidence of anthropogenic climate change has been on the political and academic agenda for decades, thus, the importance of ameliorating climate change education and literacy both at the society and university training levels. Accordingly, certain questions arise: What are the most effective current climate change educational methodologies? Which road map would be the most appropriate to be suggested to HEIs to promote climate change literacy for future professionals? In order to begin addressing these questions, the Faculty of Mathematical and Physical Sciences of the University of Chile (FCFM) approach to climate change teaching and literacy is here described. The later contemplates the history of the institutionalisation of sustainability at the FCFM, collection of courses and minors for students which incorporate climate change related-topics, as well as climate change related research centres. Keywords: is.1Thomson Reuters ISIclimatology, global atmospheric watch, ozone sondes, rapa nui, self-organizing maps, air mass, atmospheric convection, jet stream, ozone, ozonesonde, statistical analysis, stratosphere, troposphere, easter island
Dinámica del Clima2016Garreaud, R., Falvey, M., & Montecinos, A.Orographic Precipitation in Coastal Southern Chile: Mean Distribution, Temporal Variability, and Linear ContributionJournal of Hydrometeorology10.1175/JHM-D-15-0170.1While urbanites are vulnerable to a suite of risks that climate change might aggravate (e.g., mortality from extreme temperatures and property damages from floods), urban populations and decision makers may also be positioned to most effectively respond to such risks. Research is needed however, exploring both the multilevel factors and processes that determine urban risk and the complex pathways from hazards to impacts, and from perceptions and coping responses to adaptation. This paper analyzes whether and under what circumstances urban populations experience risk in selected Latin American neighborhoods of Bogotá, Buenos Aires, Mexico and Santiago; it assesses their adaptation capacity, i.e., ability to perceive and respond to hazards. It finds that urban risk depends on scale: hazards, adaptation capacities, responses and their underlying societal and physical drivers vary across urban households, neighborhoods and cities. Informality is a state of regulatory flux, where access to land and livelihood options cannot be fixed and mapped according to any prearranged sets of laws and planning mechanisms, that has a profound influence on risk and adaptation capacities across scales. For instance, informality becomes the site of considerable state power where some forms of growth in risk-prone areas enjoy state sanction while others are criminalized. The informal status becomes both a source of stigmatization that disempowers informal neighborhoods and a systemic determinant of lack of access to assets and options for adaptation capacity. is.4Thomson Reuters ISIcirculation/dynamics, fronts, geographic location/entity, model comparison, models and modeling, orographic effects, south america, atmospheric circulation, coastal zone, modeling, orographic effect, precipitation (climatology), rainband, river flow, temporal variation, chile, coastal cordillera, cordillera de nahuelbuta
Servicios Ecosistémicos2016Gómez-González, S., Ojeda, F., Torres-Morales, P., & Palma, J. E.Seed Pubescence and Shape Modulate Adaptive Responses to Fire CuesPloS one10.1371/journal.pone.0159655Scholars have focused on understanding the motivations behind urban authorities' efforts to respond to climate change, yet the determinants of institutional response capacity are less well known, particularly in Latin America. This paper develops a framework to understand the political-economic determinants of institutional response capacity through an examination of climate change governance in Mexico City and Santiago, Chile. We ask whether being a frontrunner (Mexico City) is an indicator of greater institutional response capacity. Although Mexico City has slightly higher levels of institutional capacity than Santiago, both are faced with similar challenges, such as fragmented governance arrangements, asymmetries in access to information, and top-down decision making. However, both also have similar opportunities, such as leadership, participation in transnational networks, and potential to integrate climate change goals into existing policy agendas. Examining urban climate change planning in isolation from other institutions is therefore likely to provide a false sense of a city's response capacity. is.7Thomson Reuters ISIasteraceae, dormancy, evolutionary adaptation, experimental therapy, exposure, fire, germination, habitat, heat shock, human, model, probability, puberty, smoke, adaptation, chile, disaster, ecosystem, genetics, growth, development and aging, heat, heat shock response, phenotype, plant seed, adaptation, physiological, disasters, fires, heat-shock response, hot temperature, humans, seeds
Modelación y Sistemas de Observación2016Huneeus, N., Basart, S., Fiedler, S., Morcrette, J.-J., Benedetti, A., Mulcahy, J., … Cvetkovic, B.Forecasting the northern African dust outbreak towards Europe in April 2011: a model intercomparisonAtmospheric Chemistry and Physics10.5194/acp-16-4967-2016This study aimed at understanding the natural recovery of the evergreen forest a decade after being affected by clearcutting and burning, in a site located in the Valdivian Coastal Reserve (39°56’ S-73°40’ W). A total of 27 circular (50.2 m2) plots with eight subplots each were established. Floristic composition was recorded and quantitative, diametric and age structures were determined. The results show a richness of 77 vascular species (84.4% natives), with Lophosoria quadripinnata presenting the highest relative cover (20.7%). The presence of hemicryptophytes (35%) indicates human intervention in the place. Trees were the main form of growth, being Drimys winteri, Saxegothaea conspicua and Amomyrtus luma the species with higher plant density. The latter two species growing under Chusquea macrostachya and Lophosoria quadripinnata cover. Drimys winteri and Embothrium coccineum were established immediately after the anthropogenic disturbance of clearcutting and burning, confirming the pioneering character of these two species after highly severe disturbances. Regeneration of Nothofagus nitida was scarce in the area, probably associated with low availability and seed dispersal capacity from surrounding forests. Understanding the early response of evergreen forests affected by anthropogenic disturbance is very important for assisting and guiding the ecological restoration of these forest ecosystems. is.8Thomson Reuters ISIaerosol, caliop, dust storm, long range transport, model test, modis, optical depth, point source, weather forecasting, northern europe, western europe
Servicios Ecosistémicos2016J. Alaniz, A., Galleguillos, M., & Perez-Quezada, J. F.Assessment of quality of input data used to classify ecosystems according to the IUCN Red List methodology: The case of the central Chile hotspotBiological Conservation10.1016/j.biocon.2016.10.038We have presented a descriptive analysis showing a suite of different global products that combine information from models and satellites to provide the global distribution of surface total solar radiation as well as the distribution of the main substances that explain the atmospheric extinction of solar radiation reaching the surface. Latitude, elevation, cloud fraction, water vapor, and aerosols have a first-order influence on the distribution of surface solar radiation over the planet, and no single factor explains the combined distribution. The most likely location of the total solar radiation over the surface of the planet is on the pre-Andean Domeyko Cordillera, a mountain range with elevations between 3,500 and 5,000 m. The regional climate of the Atacama is such that extremely low values of water vapor, cloud cover, ozone, and aerosols concur in this region. The atmospheric transparency in the visible and infrared provided by these conditions, together with a relatively high elevation and low latitude, conspire to produce a region where mean total radiation values exceed 300 W m-2. According to a semiempirical model for surface solar radiation that takes into account extinction by gases, clouds, aerosols, and the effect of topography, the maximum is about 310 ± 15 W m-2, although for individual years, especially those with dry summertime Altiplano conditions, the solar maximum should be located in the Altiplano region near to the Chajnantor Plateau. The delicate combination of elements that concurs in the Atacama region still justifies the increase in observational capabilities of solar radiation and atmospheric composition as it was first devised and executed by the pioneers of solar research in Mount Montezuma in the early twentieth century. Reuters ISIecosystem collapse, spatial quality, temporal quality, threat level, classification, data quality, ecosystem approach, endangered species, environmental assessment, environmental disturbance, qualitative analysis, red list, risk assessment, spatiotemporal analysis, vegetation structure, chile
Dinámica del Clima2016Jiménez-Muñoz, J. C., Mattar, C., Barichivich, J., Santamaría-Artigas, A., Takahashi, K., Malhi, Y., … Schrier, G. van der.Record-breaking warming and extreme drought in the Amazon rainforest during the course of El Niño 2015–2016Scientific Reports10.1038/srep33130During the last deglaciation, the opposing patterns of atmospheric CO2 and radiocarbon activities (Δ14C) suggest the release of 14C-depleted CO2 from old carbon reservoirs. Although evidences point to the deep Pacific as a major reservoir of this 14C-depleted carbon, its extent and evolution still need to be constrained. Here we use sediment cores retrieved along a South Pacific transect to reconstruct the spatio-temporal evolution of Δ14C over the last 30,000 years. In ~2,500–3,600 m water depth, we find 14C-depleted deep waters with a maximum glacial offset to atmospheric 14C (ΔΔ14C=−1,000‰). Using a box model, we test the hypothesis that these low values might have been caused by an interaction of aging and hydrothermal CO2 influx. We observe a rejuvenation of circumpolar deep waters synchronous and potentially contributing to the initial deglacial rise in atmospheric CO2. These findings constrain parts of the glacial carbon pool to the deep South Pacific. Reuters ISIclimate, dipole, drought, rain forest, warming
Dimensión Humana2016Laterra, P., Barral, P., Carmona, A., & Nahuelhual, L.Focusing Conservation Efforts on Ecosystem Service Supply May Increase Vulnerability of Socio-Ecological SystemsPloS one10.1371/journal.pone.0155019On 4 and 8 January 2014, at the height of the austral summer, intense wildfires in forests and dry pastures occurred in the Melipilla sector, located about 70 km to the southwest of Santiago, the Chilean capital, affecting more than 6 million inhabitants. Low level winds transported the forest fire plume towards Santiago causing a striking decrease in visibility and a marked increase in the concentration of both primary (PM10 and CO) and secondary (Ozone) pollutants in the urban atmosphere. In particular, ozone maximum concentrations in the Santiago basin reached hourly averages well above 80 ppb, the national air quality standard. This ozone increase took place at the three sampling sites considered in the present study. These large values can be explained in terms of high NOx concentrations and NO2/NO ratios in biomass burning emissions. is.5Thomson Reuters ISIecosystem, human, land use, policy, wellbeing, adaptation, argentina, environmental protection, geography, principal component analysis, adaptation, physiological, conservation of natural resources, humans
Dinámica del Clima2016Lima, M., Christie, D. A., Santoro, M. C., & Latorre, C.Coupled Socio-Environmental Changes Triggered Indigenous Aymara Depopulation of the Semiarid Andes of Tarapacá-Chile during the Late 19th-20th CenturiesPloS one10.1371/journal.pone.0160580Surface coastal observations from two automatic weather stations at Paposo (~25° S) and radiosonde observations at Paposo and Iquique (~20° S) were carried out during VOCALS-REx (VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment). Within the coastal marine boundary layer (MBL), sea-land breezes are superimposed on the prevailing southerlies, resulting in light northeasterly winds from midnight to early morning and strong southwesterlies in the afternoon. The prevailing northerlies above the MBL and below the top of the Andes are modulated by the onshore-offshore (zonal) flow forced by the diurnal cycle of surface heating/cooling along the western slope of the Andes. The daytime phase of this diurnal cycle is consistent with an enhanced afternoon coastal subsidence manifested in afternoon warming near the top of the subsidence inversion (~1.8 K at 800 hPa), lowering (~130 m) of its base (top of the MBL), and clearing of coastal Sc (stratocumulus) clouds. Results from a numerical simulation of the atmospheric circulation in a mean zonal cross section over the study area capture the afternoon zonal wind divergence and resulting subsidence of about 2 cm s−1 along a narrow (~10 km) coastal strip maximizing at around 800 hPa. Day-to-day variability in the MBL depth during VOCALS-REx shows sub-synoptic oscillations, aside from two major disruptions in connection with a deep trough and a cutoff low, as described elsewhere. These oscillations are phase-locked to those in sea-level pressure and afternoon alongshore southerlies, as found in connection with coastal lows farther south. From 24-h forward trajectories issued from significant points at the coast and inland at the extremes of the diurnal cycle, it can be concluded that the strong mean daytime Andean pumping prevents any possibility of continental sulfur sources from reaching the free troposphere above the Sc cloud deck in at least a one-day timescale, under mean conditions. Conversely, coastal sources could contribute with sulfur aerosols preferentially in the morning, provided that the weak daytime inland flow becomes partially blocked by the coastal terrain. is.8Thomson Reuters ISIrain, article, aymara (people), chile, economic development, environmental change, gross national product, human, indigenous people, nonhuman, population density, population dynamics, semiarid climate, socioeconomics, statistical model, tree, agriculture, american indian, environment, history, procedures, rural population, social change, statistics and numerical data, trends, history, 19th century, history, 20th century, humans, indians, south american, socioeconomic factors
Dinámica del Clima2016Masiokas, M. H., Christie, D. A., Le Quesne, C., Pitte, P., Ruiz, L., McPhee, J., … Barcaza, G.Reconstructing the annual mass balance of the Echaurren Norte glacier (Central Andes, 33.5° S) using local and regional hydroclimatic dataThe Cryosphere10.5194/tc-10-927-2016Episodic air quality degradation due to particles occurs in multiple cities in central and southern Chile during the austral winter reaching levels up to 300-800 µg/m3 hourly PM2.5, which can be associated with severe effects on human health. An air quality prediction system is developed to predict such events in near real time up to 3 days in advance for nine cities with regular air quality monitoring: Santiago, Rancagua, Curicó, Talca, Chillan, Los Ángeles, Temuco, Valdivia, and Osorno. The system uses the Weather Research and Forecasting with Chemistry model configured with a nested 2 km grid-spacing domain to predict weather and inert tracers. The tracers are converted to hourly PM2.5 concentrations using an observationally based calibration which is substantially less computationally intensive than a full chemistry model. The conversion takes into account processes occurring in these cities, including higher likelihood of episode occurrence during weekends and during colder days, the latter related to increased wood-burning-stove activity for heating. The system is calibrated and evaluated for April-August 2014 where it has an overall skill of 53-72% of episodes accurately forecasted (61-76% for the best initialization) which is better than persistence for most stations. Forecasts one, two, and three days in advance all have skill in forecasting events but often present large variability within them due to different meteorological initializations. The system is being implemented in Chile to assist authority decisions not only to warn the population but also to take contingency-based emission restrictions to try to avoid severe pollution events. is.2Thomson Reuters ISIair temperature, annual variation, calibration, climate cycle, climate forcing, glacier mass balance, in situ measurement, reconstruction, streamflow, andes, south america
Modelación y Sistemas de Observación2016Moisset de Espanés, P., Osses, A., & Rapaport, I.Fixed-points in random Boolean networks: The impact of parallelism in the Barabási–Albert scale-free topology caseBiosystems10.1016/j.biosystems.2016.10.003Understanding how human societies interacted with environmental changes is a major goal of archaeology and other socio-natural sciences. In this paper, we assess the human-environment interactions in the Pampa del Tamarugal (PDT) basin of the Atacama Desert over the last 13,000 years. By relying on a socio-environmental model that integrates ecosystem services with adaptive strategies, we review past climate changes, shifting environmental conditions, and the continuities and discontinuities in the nature and intensity of the human occupation of the PDT. As a result we highlight the importance of certain key resources such as water, an essential factor in the long-term trajectory of eco-historical change. Without water the outcome of human societies becomes hazardous. Reuters ISIattractors, fixed points, random boolean networks, bioinformatics, cells and cell components, gene, network analysis, numerical model, probability, topology, gene regulatory network, model, animal, biological model, computer simulation, genetics, human, randomization, animals, gene regulatory networks, humans, models, genetic, random allocation
Biogeoquímica2016Moreno-Pino, M., Iglesia, R. D. la, Valdivia, N., Henríquez-Castilo, C., Galán, A., Díez, B., & Trefault, N.Variation in coastal Antarctic microbial community composition at sub-mesoscale: spatial distance or environmental filtering?FEMS Microbiology Ecology10.1093/femsec/fiw088To better forecast streamflow and water resource availability, it is important to have an understanding of the meteorological drivers of the orographic precipitation gradient (OPG), especially critical in semiarid mountainous areas. Although forced ascent over topography typically results in precipitation increasing with altitude (positive OPGs), mean annual OPGs and especially OPGs associated with individual storms can change widely in magnitude and even sign. Precipitation measurements from the Elqui Valley in the semiarid Andes of Chile (30°S) reveal a mean annual OPG of 6.3 mm km−1 (millimeters of precipitation over kilometers in elevation) ranging from −42 to 52 mm km−1 for individual storms over the last 35 years (1979–2013). Reanalysis data and precipitation measurements are used to characterize the observed OPG in this region in relation with their synoptic-scale flow. It is found that the Froude number correlates positively with the OPG, reflecting stronger zonal winds and less static stability during storms that have positive OPGs. Altitude of the Andes barrier jet shows only a weak relationship with the OPG. Significant storms with positive OPGs are typically linked with an austral blocking of the westerlies and an equatorward migration of the midlatitude storm track. For negative OPGs, either a cutoff low or the northern edge of a surface migratory cyclone reaches the Elqui Valley in such a way that significant rainfall only occurs in the near-coastal region without major snowfall accumulation over the Andes. is.7Thomson Reuters ISIantarctica, community composition, environmental filtering, microbial community, spatial variation, submesoscale, abundance, bacterium, coastal zone, environmental gradient, eukaryote, niche, photosynthetically active radiation, salinity, sea surface temperature, fildes peninsula, king george island, south shetland islands, bacteria (microorganisms), eukaryota, sea water, biodiversity, chemistry, classification, ecosystem, genetics, high throughput sequencing, island (geological), isolation and purification, microbiology, antarctic regions, bacteria, high-throughput nucleotide sequencing, islands, seawater
Dinámica del Clima; Servicios Ecosistémicos2016Munoz, A., Gonzalez-Reyes, A., Lara, A., Sauchyn, D., Christie, D. A., Urrutia-Jalabert, R., … Sheppard, P. R.Streamflow variability in the Chilean Temperate-Mediterranean climate transition (35°S–42°S) during the last 400 years inferred from tree-ring recordsClimate Dynamics10.1007/s00382-016-3068-9The age of organic material discharged by rivers provides information about its sources and carbon cycling processes within watersheds. Although elevated ages in fluvially transported organic matter are usually explained by erosion of soils and sedimentary deposits, it is commonly assumed that mainly young organic material is discharged from flat tropical watersheds due to their extensive plant cover and rapid carbon turnover. Here we present compound-specific radiocarbon data of terrigenous organic fractions from a sedimentary archive offshore the Congo River, in conjunction with molecular markers for methane-producing land cover reflecting wetland extent. We find that the Congo River has been discharging aged organic matter for several thousand years, with apparently increasing ages from the mid- to the Late Holocene. This suggests that aged organic matter in modern samples is concealed by radiocarbon from atmospheric nuclear weapons testing. By comparison to indicators for past rainfall changes we detect a systematic control of organic matter sequestration and release by continental hydrology, mediating temporary carbon storage in wetlands. As aridification also leads to exposure and rapid remineralization of large amounts of previously stored labile organic matter, we infer that this process may cause a profound direct climate feedback that is at present underestimated in carbon cycle assessments. is.12Thomson Reuters ISIbiobío river, hydroclimate variability, southern annular mode, streamflow reconstructions, climate forcing, climate variation, hydrometeorology, paleoclimate, streamflow, tree ring, twentieth century, biobio river, chile, maule, maule river, puelo river
Dinámica del Clima2016Muñoz, R. C., Quintana, J., Falvey, M. J., Rutllant, J. A., & Garreaud, R.Coastal Clouds at the Eastern Margin of the Southeast Pacific: Climatology and TrendsJournal of Climate10.1175/JCLI-D-15-0757.1[1] Observations were performed in 12 communities of Central Chile in order to determine the horizontal gradients of ozone in the Santiago Basin and surrounding valleys. Higher ozone mixing ratios were found northeast of the Santiago Basin and included east of the Aconcagua Valley (~70 km from Santiago) suggesting that photochemical pollution produced in Santiago is capable of passing through the Chacabuco mountain chain (~1.3 km) and have impact downwind from the regions with the largest NOx and VOC emissions. To complement existing surface observations, ozonesonde and tethersonde campaigns were performed in the Santiago Basin and the Aconcagua Valley. The results suggest ozone can accumulate in layers aloft (e.g., >102 ppb at 2 km) similarly to layers observed in complex topography coastal regions like Southern California. Layers of significant ozone concentrations having a near surface origin were observed above the mixed layer and below the subsidence inversion base. We propose that the ozone in this residual layer can be transported large distances (at least to 70 km) to further penetrate into the local environment under conditions of a well-mixed boundary layer. is.12Thomson Reuters ISIatm/ocean structure/phenomena, boundary layer, circulation/dynamics, cloud cover, coastal meteorology, coastlines, geographic location/entity, physical meteorology and climatology, south america, trends, variability, climatology, coastal meteorologies, geographic location, boundary layers, atmospheric circulation, atmospheric dynamics, atmospheric structure, coastal zone, trend analysis, pacific ocean, pacific ocean (southeast)
Dimensión Humana2016Nahuelhual, L., Benra Ochoa, F., Rojas, F., Díaz, G. I., & Carmona, A.Mapping social values of ecosystem services: What is behind the map?Ecology and Society10.5751/ES-08676-210324The DCESS (Danish Center for Earth System Science) Antarctic Ice Sheet (DAIS) model is presented. Model hindcasts of Antarctic ice sheet (AIS) sea level equivalent are forced by reconstructed Antarctic temperatures, global mean sea level and high-latitude, ocean subsurface temperatures, the latter calculated using the DCESS model forced by reconstructed global mean atmospheric temperatures. The model is calibrated by comparing such hindcasts for different model configurations with paleoreconstructions of AIS sea level equivalent from the last interglacial, the last glacial maximum and the mid-Holocene. The calibrated model is then validated against present estimates of the rate of AIS ice loss. It is found that a high-order dependency of ice flow at the grounding line on water depth there is needed to capture the observed response of the AIS at ice age terminations. Furthermore, it is found that a dependency of this ice flow on ocean subsurface temperature by way of ice shelf demise and a resulting buttressing decrease is needed to explain the contribution of the AIS to global mean sea level rise at the last interglacial. When forced and calibrated in this way, model hindcasts of the rate of present-day AIS ice loss agree with recent, data-based estimates of this ice loss rate. © Author(s) 2014. is.3Thomson Reuters ISIcultural ecosystem services, recreation opportunities, social value mapping, southern chile, cartography, decision making, ecosystem service, gis, mapping, stakeholder, chile
Dinámica del Clima2016Parada, C., Frusher, S., Bustamante, R. H., Di Lorenzo, E., Bernal, P., Garreaud, R., … Yannicelli, B.South Pacific Integrated Ecosystem Studies meeting: toward conservation and sustainable use of marine resources in the South PacificFisheries Oceanography10.1111/fog.12148Future global warming from anthropogenic greenhouse gas emissions will depend on climate feedbacks, the effect of which is expressed by climate sensitivity, the warming for a doubling of atmospheric CO2 content. It is not clear how feedbacks, sensitivity, and temperature will evolve in our warming world, but past warming events may provide insight. Here we employ paleoreconstructions and new climate-carbon model simulations in a novel framework to explore a wide scenario range for the Paleocene-Eocene Thermal Maximum (PETM) carbon release and global warming event 55.8 Ma ago, a possible future warming analogue. We obtain constrained estimates of CO2 and climate sensitivity before and during the PETM and of the PETM carbon input amount and nature. Sensitivity increased from 3.3–5.6 to 3.7–6.5 K (Kelvin) into the PETM. When taken together with Last Glacial Maximum and modern estimates, this result indicates climate sensitivity increase with global warming. Reuters ISIclimate change, climate effect, coastal zone, decision making, ecosystem management, environmental management, environmental monitoring, marine ecosystem, marine resource, risk assessment, stakeholder, sustainable development, pacific ocean, pacific ocean (south)
Servicios Ecosistémicos2016Perez-Quezada, J. F., Brito, C. E., Cabezas, J., Galleguillos, M., Fuentes, J. P., Bown, H. E., & Franck, N.How many measurements are needed to estimate accurate daily and annual soil respiration fluxes? Analysis using data from a temperate rainforestBiogeosciences10.5194/bg-13-6599-2016Upwelling of CO2 from the Southern Ocean may have played a key role in deglacial warming, but marine sediment studies are hindered by inaccurate chronologies. is.24Thomson Reuters ISIcarbon flux, climate change, estimation method, measurement method, rainforest, sampling, soil respiration, soil temperature, soil texture, temperate forest
Modelación y Sistemas de Observación2016Rojas, M., Arias, P. A., Flores-Aqueveque, V., Seth, A., & Vuille, M.The South American monsoon variability over the last millennium in climate modelsClimate of the Past10.5194/cp-12-1681-2016Two Holocene tephras encountered in outcrops, cores and trenches in bogs, and lake cores in the area around Cochrane, southern Chile, are identified (based on their age, tephra glass color and morphology, mineralogy, and both bulk and glass chemistry) as H1 derived from Hudson volcano, and MEN1 derived from Mentolat volcano. New AMS radiocarbon ages indicate systematic differences between those determined in lake cores (MEN1=7,689 and H1=8,440 cal yrs BP) and surface deposits (MEN1=7,471 and H1=7,891 cal yrs BP), with the lake cores being somewhat older. H1 tephra layers range from 8 to 18 cm thick, suggesting that both the area of the 10 cm isopach and the volume of this eruption were larger than previously suggested, but not greatly, and that the direction of maximum dispersion was more to the south. MEN1 tephra layers range from 1-4 cm in thickness, indicating that this was probably a reasonably large (>5 km 3 ) eruption. Some of the lake cores also contain thin layers (<2 cm) of late Holocene H2 tephra and the recent H3 (1991 AD) tephra, both derived from the Hudson volcano. No tephra evidence has been observed for any late Pleistocene tephra, nor for the existence of the supposed Arenales volcano, proposed to be located west of Cochrane. is.8Thomson Reuters ISIanticyclone, atmospheric circulation, climate modeling, little ice age, medieval warm period, monsoon, paleoclimate, precipitation (climatology), proxy climate record, rainfall, reconstruction, subtropical region, temperature anomaly, troposphere, atlantic ocean, atlantic ocean (south), south america
Biogeoquímica2016Ronge, T. A., Tiedemann, R., Lamy, F., Köhler, P., Alloway, B. V., de Pol-Holz, R., … Wacker, L.Radiocarbon constraints on the extent and evolution of the South Pacific glacial carbon poolNature Communications10.1038/ncomms11487The 2011 eruption in the Puyehue-Cordón Caulle volcanic complex deposited up to 50 cm of tephra in a plume that intersected the crest of the Andes along Route 215, offering an excellent opportunity to study disturbance effects on native forests along a gradient of tephra depth. Our observations focused on short-term, species-level, tree mortality and sprouting and tephra fall effects on foliage and limb fall. More than 80 % of the thickest deposits were composed of a basal, pumice, gravel layer containing individual clasts up to 6 cm in length overlain by finer gravel and capped by several cm of sandy tephra. In a sample of four plots with tephra thickness ranging from 10 to 50 cm, we observed a wide range of tree mortality: about 8 % of stems living at the time of the eruption were killed by 10 cm of tephra fall and 54 % were killed by 50 cm. However, properties of the affected forest, such as species composition, foliage sprouting and retention (deciduous versus evergreen) characteristics, and tree size/age, strongly influenced survival. The sites with 35 and 50 cm thick deposits were dominated by the deciduous tree Nothofagus pumilio, which was leafless in the austral winter, season of the initial phase of the eruption. The evergreen tree N. dombeyi experienced much higher mortality. The low density of the falling pumice particles appeared to cause minimal abrasion of the canopy. Reuters ISIcarbon 14, carbon dioxide, carbon isotope, deep water, hydrothermal activity, hypothesis testing, last deglaciation, paleoceanography, radionuclide, reconstruction, sediment core, aging, article, controlled study, glacial period, hypothesis, last glacial maximum, north atlantic deep water, rejuvenation, sediment, spatiotemporal analysis, pacific ocean, pacific ocean (south)
Biogeoquímica2016Santoro, C. M., Capriles, J. M., Gayo, E. M., de Porras, M. E., Maldonado, A., Standen, V. G., … Marquet, P. A.Continuities and discontinuities in the socio-environmental systems of the Atacama Desert during the last 13,000 yearsJournal of Anthropological Archaeology10.1016/j.jaa.2016.08.006The 2008-2009 eruption of Chaitén Volcano (Chile) involved a variety of volcanic and associated hydrologic processes that damaged nearby forests. These processes included coarse (gravel) and fine (silt to sand) tephra fall, a laterally directed blast, fluvial deposition of remobilized tephra, a variety of low-temperature mass-movement processes, and a pyroclastic flow. Each of these geophysical processes constitutes a type of ecosystem disturbance which involves a distinctive suite of disturbance mechanisms, namely burial by tephra and sediment, heating, abrasion, impact force, and canopy loading (accumulation of tephra in tree crowns). Each process affected specific areas, and created patches and disturbance gradients in the forest landscape. Coarse tephra (‘gravel rain’, >5 cm depth) abraded foliage from tree canopies over an area of approximately 50 km2 north-northeast of the vent. Fine tephra (>10 cm depth) accumulated in tree crowns and led to breakage of branches in old forest and bowing of flexible, young trees over an area of about 480 km2. A directed blast down the north flank of the volcano damaged forest over an area of 4 km2. This blast zone included an area of tree removal near the crater rim, toppled forest farther down the slope, and standing, scorched forest around the blast perimeter. Fluvial deposition of >100 cm of remobilized tephra, beginning about 10 days after initiation of the eruption, buried floodplain forest in distinct, elongate streamside patches covering 5 km2 of the lower 19 km of the Rayas River and several km2 of the lower Chaitén River. Across this array of disturbance processes the fate of affected trees varied from complete mortality in the tree removal and pyroclastic flow areas, to no mortality in areas of thin tephra fall deposits. Tree damage included defoliation, loss of branches, snapping of tree trunks, abrasion of bark and ephiphytes, and uprooting. Damaged trees sprouted from epicormic buds located in trunks and branches, but sprouting varied over time among disturbance mechanisms and species. Although some effects of the Chaitén eruption are very similar to those from the 1980 eruption of Mount St. Helens (USA), interactions between biota and geophysical processes at Chaitén produced some unique effects. Examination of vegetation response helps interpret geophysical processes, and disturbance mechanisms influence early stages of biotic response to an eruption. onlineThomson Reuters ISIatacama desert, climate change, continuities and discontinuities, human-environment interaction, hyperarid environments, pampa del tamarugal, water
Biogeoquímica2016Schefuß, E., Eglinton, T. I., Spencer-Jones, C. L., Rullkötter, J., de Pol-Holz, R., Talbot, H. M., … Schneider, R. R.Hydrologic control of carbon cycling and aged carbon discharge in the Congo River basinNature Geoscience10.1038/ngeo2778Cold-water coral ecosystems present common carbonate factories along the Atlantic continental margins, where they can form large reef structures. There is increasing knowledge on their ecology, molecular genetics, environmental controls and threats available. However, information on their carbo-nate production and accumulation is still very limited, even though this information is essential for their evaluation as carbonate sinks. The aim of this study is to provide high-resolution reef aggradation and carbonate accumulation rates for Norwegian cold-water coral reefs from various settings (sunds, inner shelf and shelf margin). Furthermore, it introduces a new approach for the evaluation of the cold-water coral preservation within cold-water coral deposits by computed tomography analysis. This approach allows the differentiation of various kinds of cold-water coral deposits by their macrofossil clast size and orientation signature. The obtained results suggest that preservation of cold-water coral frameworks in living position is favoured by high reef aggradation rates, while preservation of coral rubble prevails by moderate aggradation rates. A high degree of macrofossil fragmentation indicates condensed intervals or unconformities. The observed aggradation rates with up to 1500 cm kyr−1 exhibit the highest rates from cold-water coral reefs so far. Reef aggradation within the studied cores was restricted to the Early and Late Holocene. Available datings of Norwegian cold-water corals support this age pattern for other fjords while, on the shelf, cold-water coral ages are reported additionally from the early Middle Holocene. The obtained mean carbonate accumulation rates of up to 103 g cm−2 kyr−1 exceed previous estimates of cold-water coral reefs by a factor of two to three and by almost one order of magnitude to adjacent sedimentary environments (shelf, slope and deep sea). Only fjord basins locally exhibit carbonate accumulation rates in the range of the cold-water coral reefs. Furthermore, cold-water coral reef carbonate accumulation rates are in the range of tropical reef carbonate accumulation rates. These results clearly suggest the importance of cold-water coral reefs as local, maybe regional to global, carbonate sinks. is.9Thomson Reuters ISIaridification, carbon cycle, carbon sequestration, holocene, hydrological regime, nuclear weapons testing, organic matter, precipitation assessment, radiocarbon dating, remineralization, river discharge, sediment transport, soil erosion, congo basin
Biogeoquímica2016Shaffer, G., Huber, M., Rondanelli, R., & Pepke Pedersen, J. O.Deep time evidence for climate sensitivity increase with warmingGeophysical Research Letters10.1002/2016GL069243Archaeological sites composed only of surficial lithics are widespread in arid environments. Numerical dating of such sites is challenging, however, and even establishing a relative chronology can be daunting. One potentially helpful method for assigning relative chronologies is to use lithic weathering, on the assumption that the most weathered artifacts are also the oldest. Yet, few studies have systematically assessed how local environmental processes affect weathering of surficial lithics. Using macroscopic analyses, we compared the weathering of surficial lithic assemblages from seven mid-to-late Holocene archaeological sites sampled from four different microenvironments in the Atacama Desert of northern Chile. Changes in polish, texture, shine, and color were used to establish significant differences in weathering between two kinds of locations: interfluves and canyon sites. Lithics from interfluve sites were moderately to highly weathered by wind and possessed a dark coating, whereas canyon lithics were mildly weathered despite greater exposure to moisture, often lacked indications of eolian abrasion, and lacked dark coatings. Our results show that lithic weathering can be used as a proxy for relative age, but only after considering local environmental factors. The power of such chronologies can be improved by combining archaeological, paleoenvironmental, geomorphological, and taphonomic data. is.12Thomson Reuters ISIcarbon cycle, climate sensitivity, paleoclimate, carbon dioxide, gas emissions, global warming, greenhouse effect, greenhouse gases, anthropogenic greenhouse gas emissions, carbon cycles, climate feedbacks, last glacial maximum, paleocene-eocene thermal maximums, paleoclimates, possible futures, climate models, anthropogenic effect, climate modeling, eocene, estimation method, future prospect, paleocene, sensitivity analysis
Biogeoquímica; Dinámica del Clima2016Stern, C. R., Moreno, P. I., Henríquez, W. I., Villa-Martínez, R., Sagredo, E., Aravena, J. C., & de Pol-Holz, R.Holocene tephrochronology around Cochrane (∼ 47 S), southern ChileAndean Geology10.5027/andgeoV43n1-a01AIM: Geographic, climatic, and soil factors are major drivers of plant beta diversity, but their importance for dryland plant communities is poorly known. This study aims to: i) characterize patterns of beta diversity in global drylands, ii) detect common environmental drivers of beta diversity, and iii) test for thresholds in environmental conditions driving potential shifts in plant species composition. LOCATION: 224 sites in diverse dryland plant communities from 22 geographical regions in six continents. METHODS: Beta diversity was quantified with four complementary measures: the percentage of singletons (species occurring at only one site), Whittake's beta diversity (β(W)), a directional beta diversity metric based on the correlation in species occurrences among spatially contiguous sites (β(R(2))), and a multivariate abundance-based metric (β(MV)). We used linear modelling to quantify the relationships between these metrics of beta diversity and geographic, climatic, and soil variables. RESULTS: Soil fertility and variability in temperature and rainfall, and to a lesser extent latitude, were the most important environmental predictors of beta diversity. Metrics related to species identity (percentage of singletons and β(W)) were most sensitive to soil fertility, whereas those metrics related to environmental gradients and abundance ((β(R(2))) and β(MV)) were more associated with climate variability. Interactions among soil variables, climatic factors, and plant cover were not important determinants of beta diversity. Sites receiving less than 178 mm of annual rainfall differed sharply in species composition from more mesic sites (> 200 mm). MAIN CONCLUSIONS: Soil fertility and variability in temperature and rainfall are the most important environmental predictors of variation in plant beta diversity in global drylands. Our results suggest that those sites annually receiving ∼ 178 mm of rainfall will be especially sensitive to future climate changes. These findings may help to define appropriate conservation strategies for mitigating effects of climate change on dryland vegetation. is.1Thomson Reuters ISIandes, chile, hudson, mentolat, tephra, tephrochronology, volcanism, core analysis, holocene, pleistocene, spatial distribution, volcanic eruption, cochrane, nica
Modelación y Sistemas de Observación2016Van den Hoof, C., & Lambert, F.Mitigation of Drought Negative Effect on Ecosystem Productivity by Vegetation MixingJournal of Geophysical Research: Biogeosciences10.1002/2016JG003625Old-growth temperate rainforests are, per unit area, the largest and most long-lived stores of carbon in the terrestrial biosphere, but their carbon dynamics have rarely been described. The endangered Fitzroya cupressoides forests of southern South America include stands that are probably the oldest dense forest stands in the world, with long-lived trees and high standing biomass. We assess and compare aboveground biomass, and provide the first estimates of net primary productivity (NPP), carbon allocation and mean wood residence time in medium-age stands in the Alerce Costero National Park (AC) in the Coastal Range and in old-growth forests in the Alerce Andino National Park (AA) in the Andean Cordillera. Aboveground live biomass was 113-114 Mg C ha(-1) and 448-517 Mg C ha(-1) in AC and AA, respectively. Aboveground productivity was 3.35-3.36 Mg C ha(-1) year(-1) in AC and 2.22-2.54 Mg C ha(-1) year(-1) in AA, values generally lower than others reported for temperate wet forests worldwide, mainly due to the low woody growth of Fitzroya. NPP was 4.21-4.24 and 3.78-4.10 Mg C ha(-1) year(-1) in AC and AA, respectively. Estimated mean wood residence time was a minimum of 539-640 years for the whole forest in the Andes and 1368-1393 years for only Fitzroya in this site. Our biomass estimates for the Andes place these ecosystems among the most massive forests in the world. Differences in biomass production between sites seem mostly apparent as differences in allocation rather than productivity. Residence time estimates for Fitzroya are the highest reported for any species and carbon dynamics in these forests are the slowest reported for wet forests worldwide. Although primary productivity is low in Fitzroya forests, they probably act as ongoing biomass carbon sinks on long-term timescales due to their low mortality rates and exceptionally long residence times that allow biomass to be accumulated for millennia. is.10Thomson Reuters ISIatmospheric feedback, carbon sink, extreme events, land surface modeling, vegetation mixing, carbon flux, climate effect, climate feedback, drought, ecosystem dynamics, ecosystem function, ecosystem modeling, extreme event, land surface, net ecosystem production, species diversity, vegetation dynamics, vegetation type
Biogeoquímica2016Verdugo, J., Damm, E., Snoeijs, P., Díez, B., & Farías, L.Climate relevant trace gases (N2O and CH4) in the Eurasian Basin (Arctic Ocean)Deep Sea Research Part I: Oceanographic Research Papers10.1016/j.dsr.2016.08.016Little is known about how old-growth and massive forests are responding to environmental change. We investigated tree-ring growth and carbon isotopes of the long-lived and high biomass Fitzroya cupressoides in two stands growing in contrasting environmental conditions in the Coastal Range (∼300 years old) and Andean Cordilleras (>1500 years old) of southern Chile. The interannual variability in δ13C was assessed for the period 1800-2010, and changes in discrimination and intrinsic water use efficiency (iWUE) were evaluated in relation to changes in climate and tree-ring growth during the last century. 13C discrimination has significantly decreased, and iWUE has increased since the 1900s in both sites. However, these trends in isotopic composition have been accompanied by different growth patterns: decreasing growth rates in the Coastal Range since the 1970s and increasing growth rates in the Andes since the 1900s. Trees growing in the Coastal Range have become more efficient in their use of water, probably due to reduced stomatal conductance caused by increases in CO2 and warming. Trees growing in the Andes have also become more water use efficient, but this has been likely due to increased photosynthetic rates. Fitzroya forests, including particularly old-growth stands, are responding to recent environmental changes, and their response has been site dependent. The growth of forests under a more Mediterranean climate influence and restrictive soil conditions in the Coastal Range has been more negatively affected by current warming and drying; while the growth of old stands in thewet Andes has been positively affected by changes in climate (decreasing cloudiness) and increasing CO2. Permanent monitoring of these endangered forests under ongoing environmental changes is needed in order to reassure the long-term preservation of this millennial-aged species. Reuters ISIarctic ocean, methane and dmspt, spatial distribution of nitrous oxide, environmental regulations, gases, greenhouse gases, methane, nitrogen oxides, dimethylsulfoniopropionate, environmental change, global ocean circulation, heterogeneous distributions, intermediate waters, nitrous oxide, spatial patterns, oceanography, algal bloom, antarctic intermediate water, chemical oceanography, climate conditions, concentration (composition), microalga, oceanic circulation, spatial distribution, trace gas, water chemistry, amundsen basin, eurasian basin, nansen basin
Biogeoquímica2016Yevenes, M. A., Arumí, J. L., & Farías, L.Unravel biophysical factors on river water quality response in Chilean Central-Southern watershedsEnvironmental Monitoring and Assessment10.1007/s10661-016-5235-1Relationships between environmental factors and stem radius variation at short temporal scales can provide useful information regarding the sensitivity of tree species' productivity to climate change. This study used automatic point dendrometers to assess the relationship between environmental variables and stem radius contraction and increment in ten Fitzroya cupressoides trees growing in two sites, the Coastal Range (Alerce Costero National Park) and the Andean Cordillera (Alerce Andino National Park) of southern Chile. The growing season in each site, determined using stem daily cycle patterns for each month, was longer in the Coastal Range site than in the Andes. Warmer and sunnier conditions were positively related with daytime tree radius contraction in both areas, and relationships were stronger in the Coastal Range site where more pronounced shrinking events were associated with prolonged warm and dry conditions compared to the Andes. Stem increment was positively related with precipitation and humidity in both sites, reflecting the positive effect of water on cell turgidity and consequent enlargement. Relationships between stem radius change and environmental variables considering longer temporal scales (7 to 31 days), confirmed a stronger association with humidity/vapor pressure deficit and precipitation, rather than with temperature. Although Fitzroya grows in particularly wet and cool areas, current and projected drier and warmer summer conditions in southern Chile may have a negative effect on Fitzroya stem increment and carbon accumulation in both sites. This effect would be more critical in the Coastal Range compared with the Andes though, due in part to more limiting soil conditions and less summer precipitation in this area. Long-term research is needed to monitor different aspects of the response of these endangered ecosystems to this additional threat imposed by climate change. is.5Thomson Reuters ISIbiophysical drivers, land use, leaching, runoff, water quality, agricultural runoff, agriculture, biochemical oxygen demand, biophysics, dissolved oxygen, geographic information systems, moisture, multivariant analysis, rivers, silicates, silicon, soil moisture, soils, topography, water management, watersheds, biological oxygen demand, biophysical factors, efficient managements, human-induced degradations, multivariate statistics, redundancy analysis (rda), river water quality, spatial variations, water resources, nitrate, phosphate, river water, silicate, fresh water, nitric acid derivative, rain, soil, anthropogenic effect, climate effect, gis, topographic effect, watershed, article, chile, controlled study, electric conductivity, environmental factor, ph, physical chemistry, precipitation, seasonal variation, water temperature, chemistry, environmental monitoring, hydrology, river, season, standards, itata, biological oxygen demand analysis, nitrates, seasons
Biogeoquímica2016Yevenes, M. A., Bello, E., Sanhueza-Guevara, S., & Farías, L.Spatial Distribution of Nitrous Oxide (N2O) in the Reloncaví Estuary–Sound and Adjacent Sea (41°–43° S), Chilean PatagoniaEstuaries and Coasts10.1007/s12237-016-0184-zThe relations between humans and animals extend into socio-cultural aspects that go beyond the mere acquisition of food, meaning that animals constitute cultural resources that fulfill diverse roles in social and cultural systems. Visual images in different media, including rock art, represent one of the ways in which these complex relationships take place. While in the New World few comparative analyses of archaeofaunal and visual data have been addressed, in the Old World these studies have been framed by a dichotomist view between drawn (thought) and consumed (eaten) understanding, both terms as separate and disconnected social realms. This view also structures an abstract, non-pragmatic, rather passive, world drawn in art, against a concrete, practical, active world of consumption. The analysis we present here, based on principles of substantive economy theory, explores the relation between humans and animals in the prehistory of the Atacama Desert (ca. 13,000-410. BP), by comparing visual images of fauna depicted in rock art (engravings and paintings) with archaeofaunal remains from domestic and funerary contexts. The dataset (comprised of 1534 archaeofaunal items and 729 rock art animal motifs from 117 sites) was standardized by calculating the percentage of ubiquity of each animal item per period of time, using Spearman's rank correlation coefficients to identify synchronic and diachronic changes in the relative importance of certain animals consumed. We observed important temporal and contextual variations in the consumption of animals drawn in rock art in the Atacama Desert, and we conclude that they reflect a selection of a wide range of ritual and utilitarian, but not mutually exclusive, functions. In particular, images of camelids emphasized the importance of providing fiber for the creation of textile artifacts and camelid use as pack animals in the caravan trade, both activities that were fundamental in the economy of local societies. onlineThomson Reuters ISIchilean fjord, interior sea of chiloé, nitrous oxide, nutrients, reloncaví estuary, coastal zone, estuarine environment, fjord, inland sea, nutrient budget, shelf sea, spatial distribution, chilean margin, pacific ocean, patagonia, chilo
Biogeoquímica2016Yevenes, M. A., Soetaert, K., & Mannaerts, C. M.Tracing Nitrate-Nitrogen Sources and Modifications in a Stream Impacted by Various Land Uses, South PortugalWater10.3390/w8090385Vegetation diversity and interaction is thought to have a beneficial effect on ecosystem functioning, particularly improving ecosystem resistance to drought. This is of significant importance in the context of a warmer world, as extreme events such as droughts become more likely. Most of the studies performed so far on vegetation interaction are based on observations. Here we use the land surface model JULES to study the potential of vegetation mixing to mitigate the negative effect of drought events on the land surface through interaction, a mechanism which is difficult to study in situ at large scales. Using a set of simulations with mixed and unmixed vegetation, we show that the carbon, water, and energy fluxes are significantly affected by vegetation competition for water resources. The interaction is in general beneficial for the ecosystem carbon assimilation due to a better use of water resources. This benefit is highest when traits between vegetation types concerning resource competition overlap least. For a tree-grass combination, mixing improves carbon assimilation by 5% to 8% during summer. The NPP benefit of mixing increases further under progressively more resource-limited conditions up to an inflection point with a benefit of 14%, after which it falls back to zero under extremely dry conditions. Mixing also tends to reduce the inter-annual variability of the ecosystem carbon sink and therefore improves the resistance of the ecosystem. Our results highlight the importance of vegetation interaction in climate simulations and impact studies, and the potential of vegetation mixing as a mitigation tool. is.9Thomson Reuters ISInitrate-nitrogen, reactive transport model, stable isotopes, streams, catchments, denitrification, drought, groundwater, isotopes, land use, nitrates, potable water, reservoirs (water), sediments, water quality, isotopic composition, nitrate nitrogen, nitrogen transformations, reactive transport modeling, sediment water interface, surface and ground waters, rivers, catchment, drinking water, land use change, nitrate, nitrogen, porewater, reactive transport, reservoir, sediment-water interface, stable isotope, streamflow, transformation, alentejo, portugal
Servicios Ecosistémicos2016Zhao, Y., Feng, D., Yu, L., Wang, X., Chen, Y., Galleguillos, M., … Gong, P.Detailed dynamic land cover mapping of Chile: Accuracy improvement by integrating multi-temporal dataRemote Sensing of Environment10.1016/j.rse.2016.05.016Ecological disturbances triggered by earthquakes and volcanic eruptions are of fundamental importance in structuring the temperate forests of southwestern South America and New Zealand. We review studies of the ecological effects of these tectonic phenomena and how they have been central to progress in the modern development of forest ecology in both regions. Studies of tectonic influences on the dynamics of southern temperate rainforests of Chile and New Zealand published in the 1970s and early 1980s contributed prominently to the shift away from the equilibrium paradigms dominant globally in the 1960s and towards modern non- equilibrium frameworks of forest dynamics. Empirical studies of tectonic ecology in these temperate forests in combination with critical evaluations of earlier successional theory have significantly advanced understanding of the roles of coarse scale disturbance in the dynamics of forests in southwestern South America and New Zealand. Recognition that cohort forest For Peer Review Only structures triggered by exogenous disturbances such as wind storms and tectonic events are the norm rather than all-aged structures has been of fundamental importance to understanding the dynamics of these forests. The non-equilibrium patch dynamics framework for interpreting forest structure and dynamics bolstered by tectonic ecology studies in southern South America and New Zealand was of key importance in refining older views of these forests as being out of equilibrium with contemporary climate, revising understanding of the effects of introduced browsing animals on forest structure, and guiding the development of appropriate forest management practices. Reuters ISI30 m, biodiversity, land cover mapping, landsat, seasonal dynamics, mapping, enhanced vegetation index, high resolution imagery, shuttle radar topography mission, spatial variation of accuracies, image enhancement, accuracy assessment, digital elevation model, ecosystem dynamics, land cover, satellite imagery, seasonality, spatial variation, vegetation index, vegetation mapping, chile
Dimensión Humana2016Ahumada, G. A.Derecho internacional y política de adaptación al cambio climático en Reino UnidoOPERA Colombia10.18601/16578651.n19.03Este artículo describe la influencia que ha ejercido el derecho internacional desde las orientaciones provenientes del régimen internacional del cambio climático y la Unión Europea, en la gobernanza actual de la adaptación al cambio climático en el Reino Unido, especialmente en relación con la política del desarrollo sustentable. Reuters ESCI y Latindex
Dimensión Humana2016Kugler, N. R., & Moraga Sariego, P.“Climate change damages”, conceptualization of a legal notion with regard to reparation under international lawClimate Risk Management10.1016/j.crm.2016.06.004The damages related to climate change are a concerning issue for the international community, as no country will escape the impacts of climate change. Indeed, it is a preoccupation for the countries (mostly vulnerable) that will suffer those damages, but also for the States that emitted greenhouse gases which fear to have to repair them. That’s why the international negotiation related to the climate regime use the ambiguous term “loss and damage” to design the impacts related to climate change. The purpose of this article is to know if the term “loss and damage” is a useful one in view of reparation under international law or if it is necessary to conceptualize the “climate change damage” notion employed by the doctrine. More precisely, the central question is the following: why is it necessary to conceptualize the “climate change damage” notion? Even though “loss and damage” could formally be a legal concept, it is substantially useless with regard to reparation under international law because it is too ambiguous. Therefore, we judged necessary to clarify the concept of “climate change damage” used by the doctrine but that unfortunately defines it insufficiently. Indeed, it could be useful for the doctrine but also for the lawyers of vulnerable countries and the judges to dispose of a legal notion in order to consider the reparation of the damages related to climate change under international law. Consequently, we propose in this article a definition of climate change damage that could be useful with regard to reparation under international law.
Modelación y Sistemas de Observación2016Muñoz, F.Conocimiento Climático y Redes de Datos Meteorológicos ¿Por qué necesitamos monitorear el clima?Bits de CienciaEl tiempo y el clima afectan la forma en que vivimos y las decisiones que tomamos. La disponibilidad hídrica, actividades económicas, interacciones sociales, migraciones, planificación e implementación de políticas públicas a diferentes escalas, e incluso la biodiversidad del planeta se relacionan con las tendencias climáticas o con la recurrencia de eventos extremos y los escenarios futuros. A nivel global, eventos meteorológicos extremos tales como sequías, tormentas de viento, olas de calor, inundaciones fluviales y costeras han aumentado considerablemente en las últimas décadas (ver Jennings 2011), y las proyecciones climáticas (IPCC, 2014) muestran que estos serán más frecuentes y severos. En nuestro país, por ejemplo, la sequía extrema y los aumentos de temperatura que hemos experimentado en los últimos seis años no tienen precedentes en el registro histórico. Esta condición se presenta en siete regiones con un déficit de precipitaciones cercano al 30% y en el contexto de la década más seca y cálida de los últimos 100 años. Pero, ¿cómo podemos realizar predicciones a largo plazo y así determinar la eventual recurrencia de algún evento, diferenciando la contribución antropogénica de la variabilidad natural? Sólo es posible si contamos con datos observados de larga data, robustos y confiables que sirvan de entrada a los modelos climáticos. En tanto, para predecir y generar alertas tempranas de eventos extremos –como aluviones, in-cendios forestales derivados de olas de calor, o tormentas inusuales– es también necesario contar con redes automáticas de monitoreo que recolecten, procesen y modelen estas observaciones en tiempo real. indexed
Biogeoquímica2016Salazar, D., Corral, I., Corrales, P., Avilés, S., Escudero, A., Flores, C., … Palma, C.¿Ocupaciones tardías del Complejo Cultural Bato en Maitencillo? Implicancias para la trayectoria histórica de las poblaciones del litoral de Chile CentralBoletín de la Sociedad Chilena de ArqueologíaSe discute la existencia y características de ocupaciones posiblemente correspondientes al Complejo Cultural Bato en la costa de Maitencillo, a inicios del segundo milenio de nuestra era. Los datos provienen de excavaciones de rescate en los sitios Abanico 1 y Abanico 3, así como del análisis de sus materiales y contextos. Ambos sitios serían conchales efímeros con ocupaciones del Período Alfarero Temprano datadas entre los siglos XII y XIV, además de una ocupación histórica temprana en Abanico 3. Los resultados sugieren la posibilidad de que formas de vida tradicionales, originadas en el PAT de Chile Central, se mantengan en ciertos sectores hasta tiempos prehispánicos tardíos e incluso históricos tempranos, abriendo interesantes interrogantes acerca de las condiciones de coexistencia de estas poblaciones con otras sociedades más complejas tales como la Cultura Aconcagua, el Tawantinsuyu y el imperio hispano colonial.
Dinámica del Clima; Servicios Ecosistémicos2017Aguilera-Betti, I., Muñoz, A. A., Stahle, D., Figueroa, G., Christie, D.A., González, M., … Fernandez, A.The First Millennium-Age Araucaria Araucana in PatagoniaTree-Ring Research10.3959/1536-1098-73.1.53The concentration of greenhouse gases, including nitrous oxide (N2O), methane (CH4), and compounds such as total dimethylsulfoniopropionate (DMSPt), along with other oceanographic variables were measured in the ice-covered Arctic Ocean within the Eurasian Basin (EAB). The EAB is affected by the perennial ice-pack and has seasonal microalgal blooms, which in turn may stimulate microbes involved in trace gas cycling. Data collection was carried out on board the LOMROG III cruise during the boreal summer of 2012. Water samples were collected from the surface to the bottom layer (reaching 4300 m depth) along a South-North transect (SNT), from 82.19°N, 8.75°E to 89.26°N, 58.84°W, crossing the EAB through the Nansen and Amundsen Basins. The Polar Mixed Layer and halocline waters along the SNT showed a heterogeneous distribution of N2O, CH4 and DMSPt, fluctuating between 42-111 and 27–649% saturation for N2O and CH4, respectively; and from 3.5 to 58.9 nmol L−1 for DMSPt. Spatial patterns revealed that while CH4 and DMSPt peaked in the Nansen Basin, N2O was higher in the Amundsen Basin. In the Atlantic Intermediate Water and Arctic Deep Water N2O and CH4 distributions were also heterogeneous with saturations between 52% and 106% and 28% and 340%, respectively. Remarkably, the Amundsen Basin contained less CH4 than the Nansen Basin and while both basins were mostly under-saturated in N2O. We propose that part of the CH4 and N2O may be microbiologically consumed via methanotrophy, denitrification, or even diazotrophy, as intermediate and deep waters move throughout EAB associated with the overturning water mass circulation. This study contributes to baseline information on gas distribution in a region that is increasingly subject to rapid environmental changes, and that has an important role on global ocean circulation and climate regulation. is.1Thomson Reuters ISIaraucaria araucana, endangered species, llaimavolcano, millennium-old araucaria, parque nacionalconguillio, pehuén
Biogeoquímica2017Alcamán, M. E., Alcorta, J., Bergman, B., Vásquez, M., Polz, M., & Díez, B.Physiological and gene expression responses to nitrogen regimes and temperatures in Mastigocladus sp. strain CHP1, a predominant thermotolerant cyanobacterium of hot springsSystematic and Applied Microbiology10.1016/j.syapm.2016.11.007Summertime [December-February (DJF)] precipitation over the western slopes of the subtropical Andes (32°-368°) accounts for less than 10% of the annual accumulation, but it mostly occurs as rain and may trigger landslides leading to serious damages. Based on 13 year of reanalysis, in situ observations, and satellite imagery, a synoptic climatology and physical diagnosis reveal two main weather types lead to distinct precipitation systems. The most frequent type (̃80% of the cases) occurs when a short-wave midlevel trough with weak winds and thermally driven mountain winds favor the development of convective precipitation during the daytime. The trough progresses northwest of a long-lasting warm ridge, which produces low-level easterly airflow that enhances its buoyancy as it moves over the arid land of western Argentina toward the Andes. The weak winds aloft facilitate the penetration of the moist easterly flow into the Andes. Midlevel flow coming from the west side of the Andes is decoupled from the low-level maritime air by a temperature inversion, and thus provides little moisture to support precipitation. The less frequent type (̃20% of the cases) occurs when a deep midlevel trough and strong westerly flow produces stratiform precipitation. This type has a baroclinic nature akin to winter storms, except that they are rare in summer and there is no evidence of a frontal passage at low levels. The lifting and cooling ahead of the trough erode the typical temperature inversion over the Pacific coast, and thus allows upslope transport of low-level marine air by the strong westerlies forming a precipitating cloud cap on the western slope of the Andes. © 2014 American Meteorological Society. is.2Thomson Reuters ISIgene expression, mastigocladus sp., nitrate/ammonium preference, thermotolerance, ammonia, bacterial dna, bacterial protein, bacterial rna, contig, genomic dna, glutamate ammonia ligase, integrase, methyltransferase, nitrate, nitrate reductase, nitrite, nitrogen, rna 16s, transfer rna, ammonium derivative, glutamine synthetase i, nitric acid derivative, nitrogenase reductase, oxidoreductase, ribosome dna, article, bacterial gene, bacterial genetics, bacterial genome, bacterial phenomena and functions, bacterial strain, bacterial structures, binding affinity, chile, cladistics, concentration (parameters), controlled study, darkness, evolutionary adaptation, fischerella, gene cluster, genetic transcription, glna gene, heat tolerance, high temperature, light adaptation, mastigocladus, microbial mat, microscopy, narb gene, nifh gene, nira gene, nitrogen fixation, nonhuman, nucleotide sequence, photoautotroph, priority journal, stigonematales, thermal spring, thermophilic bacterium, transmission electron microscopy, biosynthesis, chemistry, cluster analysis, cyanobacterium, dna sequence, drug effects, gene expression profiling, genetics, light, metabolism, microbiology, phylogeny, radiation response, temperature, ammonium compounds, cyanobacteria, dna, bacterial, dna, ribosomal, glutamate-ammonia ligase, hot springs, nitrates, oxidoreductases, rna, ribosomal, 16s, sequence analysis, dna
Modelación y Sistemas de Observación2017Berman, A. L., Silvestri, G. E., Rojas, M., & Tonello, M. S.Accelerated greenhouse gases versus slow insolation forcing induced climate changes in southern South America since the Mid-HoloceneClimate Dynamics10.1007/s00382-016-3081-zThe orographic effect of the Andes (30°S-55°S) on upwind precipitating clouds from midlatitude frontal systems is investigated using surface and satellite data. Rain gauges between 33°S and 44°S indicate that annual precipitation increases from the Pacific coast to the windward slopes by a factor of 1.8 ± 0.3. Hourly gauges and instantaneous satellite estimates reveal that the cross-barrier increase in annual precipitation responds to an increase in both the intensity and frequency of precipitation. CloudSat satellite data indicate that orographic effects of the Andes on precipitating ice clouds increase gradually from midlatitudes to subtropics, likely as a result of a reduction of synoptic forcing and an increase of the height of the Andes equatorward. To the south of 40°S, the thickness of clouds slightly decreases from offshore to the Andes. The total ice content increases substantially from the open ocean to the coastal zone (except to the south of 50°S, where there is no much variation over the ocean), and then experience little changes in the cross-mountain direction over the upstream and upslope sectors. Nevertheless, the maximum ice content over the upslope sector is larger and occurs at a lower level than their upwind counterparts. In the subtropics, the offshore clouds contain almost no ice, but the total and maximum ice content significantly increases toward the Andes, with values being much larger than their counterparts over the extratropical Andes. Further, the largest amounts of cloud ice are observed upstream of the tallest Andes, suggesting that upstream blocking dominates there. is.1-2Thomson Reuters ISIanthropogenic forcing, mid-holocene, natural forcing, patagonia, pmip3 models, south america, climate forcing, climate modeling, climate variation, greenhouse gas, holocene, human activity, insolation, paleoclimate
Biogeoquímica2017Blanco, J. F., Correa G, I., Flores, C., & Pimentel G, G.La Extracción Prehispánica de recursos minerales en el internodo Quillagua-Costa, desierto de AtacamaEstudios atacameños10.4067/S0718-10432017005000003Internodal archaeological evidence ofextractive occupations is presented in this study. Evidence comes from the survey and analyses ofsites on the prehistoric route between Quillagua (inferior Loa River) and the north Coast of Tocopilla, across the Coastal mountain range of the Atacama Desert. This archaeological record is discussed in relation to previously-known prehistoric data about settlements and internodal trails ofthe Coast, and Inferior and middle Loa sections. We characterize two extractive sites of mineral resources detected in association to pathways, a mine and a lithic workshop. Data from excavations, analyses ofarchaeological materials and absolute dates are used to discuss mobility of coastalgroups to the interior of the desert and of Oasiss societies to the coast in different periods oftime. Previously formulated models of mobility and provisioning as well as regional archaeological and ethnographic data, are used to discuss the presented results, and are applied to examine more general aspects of "Internodal Studies" in pressThomson Reuters ISI (AHCI)atacama desert, lithic and mineral provisioning, mobility, prehistoric trails
Dimensión Humana2017Borquez, R., Aldunce, P., & Adler, C.Resilience to climate change: from theory to practice through co-production of knowledge in ChileSustainability Science10.1007/s11625-016-0400-6The recent hiatus in global warming is likely to be reflected in Andean temperature, given its close dependence on tropical Pacific sea surface temperature (SST). While recent work in the subtropical Andes has indeed documented a cooling along coastal areas, trends in the tropical Andes show continued warming. Here we analyze spatiotemporal temperature variability along the western side of the Andes with a dense station network updated to 2010 and investigate its linkages to tropical Pacific modes of variability. Results indicate that the warming in tropical latitudes has come to a halt and that the subtropical regions continue to experience cooling. Trends, however, are highly dependent on elevation. While coastal regions experience cooling, higher elevations continue to warm. The coastal cooling is consistent with the observed Pacific Decadal Oscillation (PDO) fingerprint and can be accurately simulated using a simple PDO-analog model. Much of the PDO imprint is modulated and transmitted through adjustments in coastal SST off western South America. At inland and higher-elevation locations, however, temperature trends start to diverge from this PDO-analog model in the late 1980s and have by now emerged above the 1σ model spread. Future warming at higher elevation is likely and will contribute to further vertical stratification of atmospheric temperature trends. In coastal locations, future warming or cooling will depend on the potential future intensification of the South Pacific anticyclone but also on continued temperature dependence on the state of the PDO. ©2015. is.1Thomson Reuters ISIchile, climate change, co-production, drought, resilience, transdisciplinarity
Biogeoquímica2017Farias, L., Sanzana, K., Sanhueza-Guevara, S., & Yevenes, M. A.Dissolved methane distribution in the Reloncavi fjord and adjacent marine system during austral winter (41º-43ºS)Estuaries and Coasts10.1007/s12237-017-0241-2Identifying the key anthropogenic (land uses) and natural (topography and climate) biophysical drivers affecting river water quality is essential for efficient management of water resources. We tested the hypothesis that water quality can be predicted by different biophysical factors. Multivariate statistics based on a geographical information system (GIS) were used to explore the influence of factors (i.e., precipitation, topography, and land uses) on water quality (i.e., nitrate (NO 3 − ), phosphate (PO 4 3 − ), silicate (Si(OH)4), dissolved oxygen (DO), suspended solids (TSS), biological oxygen demand (DO), temperature (T), conductivity (EC), and pH) for two consecutive years in the Itata and Biobío river watersheds, Central Chile (36° 00′ and 38° 30′). The results showed that (NO 3 − ), (PO 4 3 − ), Si(OH)4, TSS, EC, and DO were higher during rainy season (austral fall, winter, and spring), whereas BOD and temperature were higher during dry season. The spatial variation of these parameters in both watersheds was related to land use, topography (e.g., soil moisture, soil hydrological group, and erodability), and precipitation. Soil hydrological group and soil moisture were the strongest explanatory predictors for PO 4 3 − , Si(OH)4 and EC in the river, followed by land use such as agriculture for NO 3 − and DO and silviculture for TSS and Si(OH)4. High-resolution water leaching and runoff maps allowed us to identify agriculture areas with major probability of water leaching and higher probability of runoff in silviculture areas. Moreover, redundancy analysis (RDA) revealed that land uses (agriculture and silviculture) explained in 60 % the river water quality variation. Our finding highlights the vulnerability of Chilean river waters to different biophysical drivers, rather than climate conditions alone, which is amplified by human-induced degradation.vol. in pressThomson Reuters ISIfjords, methane, north chilean patagonia, biogeochemical cycle, coastal zone, discharge, estuarine environment, greenhouse gas, marine environment, microbial activity, plankton, pycnocline, runoff, seston, surface water, winter, chile, los lagos, pacific ocean, patagonia, reloncavi fjord, sea of chiloe, chilo
Servicios Ecosistémicos2017Galleguillos, M., Jacob, F., Prévot, L., Faúndez, C., & Bsaibes, A.Estimation of actual evapotranspiration over a rainfed vineyard using a 1-D water transfer model: A case study within a Mediterranean watershedAgricultural Water Management10.1016/j.agwat.2017.01.006Fjords and estuaries exchange large amounts of solutes, gases, and particulates between fluvial and marine systems. These exchanges and their relative distributions of compounds/particles are partially controlled by stratification and water circulation. The spatial and vertical distributions of N2O, an important greenhouse gas, along with other oceanographic variables, are analyzed from the Reloncaví estuary (RE) (~41° 30′ S) to the gulf of Corcovado in the interior sea of Chiloé (43° 45′ S) during the austral winter. Freshwater runoff into the estuary regulated salinity and stratification of the water column, clearly demarking the surface (<5 m depth) and subsurface layer (>5 m depth) and also separating estuarine and marine influenced areas. N2O levels varied between 8.3 and 21 nM (corresponding to 80 and 170 % saturation, respectively), being significantly lower (11.8 ± 1.70) at the surface than in subsurface waters in the Reloncaví estuary (14.5 ± 1.73). Low salinity and NO3 −, NO2 −, and PO4 3− levels, as well as high Si(OH)4 values were associated with low surface N2O levels. Remarkably, an accumulation of N2O was observed in the subsurface waters of the Reloncaví sound, associated with a relatively high consumption of O2. The sound is exposed to increasing anthropogenic impacts from aquaculture and urban discharge, occurring simultaneously with an internal recirculation, which leads to potential signals of early eutrophication. In contrast, within the interior sea of Chiloé (ISC), most of water column was quasi homohaline and occupied by modified subantarctic water (MSAAW), which was relatively rich in N2O (12.6 ± 2.36 nM) and NO3 − (18.3 ± 1.63 μM). The relationship between salinity, nutrients, and N2O revealed that water from the open ocean, entering into ISC (the Gulf of Corcovado) through the Guafo mouth, was the main source of N2O (up to 21 nM), as it gradually mixed with estuarine water. In addition, significant relationships between N2O excess vs. AOU and N2O excess vs. NO3 − suggest that part of N2O is also produced by nitrification. Our results show that the estuarine and marine waters can act as light source or sink of N2O to the atmosphere (air–sea N2O fluxes ranged from −1.57 to 5.75 μmol m−2 day−1), respectively; influxes seem to be associated to brackish water depleted in N2O that also caused a strong stratification, creating a barrier to gas exchange. Reuters ISIheterogeneous landscape, hydrus-1d, vadose zone, water table, calibration, electric conductivity measurement, groundwater, land use, remote sensing, soil moisture, soils, actual evapotranspiration, heterogeneous landscapes, mediterranean watersheds, soil moisture profiles, soil water balance model, water tables, soil surveys, eddy covariance, estimation method, evapotranspiration, heterogeneity, hydrological modeling, mediterranean environment, model validation, one-dimensional modeling, rainfed agriculture, soil water, spatiotemporal analysis, vineyard, watershed, mediterranean region, vitis
Servicios Ecosistémicos2017Jones, J., Almeida, A., Cisneros, F., Iroumé, A., Jobbágy, E., Lara, A., Little, C.,… Villegas, J. C.Forests and water in South AmericaHydrological Processes10.1002/hyp.11035The identification of nitrate-nitrogen (NO3–N) origin is important in the control of surface and ground water quality. These are the main sources of available drinking water. Stable isotopes (15N and 18O) for NO3–N and along with a 1-D reactive transport model were used to study the origin and processes that lead to nitrogen transformation and loss in a major stream that flows into a reservoir within an intensively cultivated catchment area (352 km2) in Alentejo-Portugal. Seasonal water samples (October–November 2008, March 2009 and September 2009) of stream surface water, wells and sediment pore water were collected. The results showed consistently increasing isotope values and decreasing NO3–N concentrations downstream. During winter (wet period, November 2008 and March 2009) slightly higher NO3–N concentrations were found in comparison to early fall (dry period: October 2008) and summer (dry period: September 2009). Isotopic composition of 15N and 18O values in surface water samples from the stream and wells indicated that the dominant NO3–N sources were derived mainly from the soil and fertilizers. There was also significant nitrification in surface water at the head of the stream. Sediment pore waters showed high NO3–N values near the sediment-water interface (reaching 25 mg·N·L−1) and NO3–N concentrations sharply decreasing with sediment depth, suggesting significant NO3–N consumption. Denitrification was also detected using the 15N signature in upstream waters, but not downstream where very low NO3–N levels were measured. In the stream, the calculated isotopic enrichment factor for NO3–N was −2.9‰ for 15N and −1.78 for 18O, this indicates that denitrification accounts for 7.8% to 48% of nitrate removal. is.5Thomson Reuters ISIdeforestation, ecosystem service trade-offs, forest plantations, paired watersheds, water yield, commerce, economic and social effects, hydrogeology, wood products, collaborative research, ecosystem services, forest plantation, management objectives, sustainable forest management, trade off, ecosystems, ecosystem service, forest cover, forest management, land use change, sustainable forestry, trade-off, watershed, south america
Servicios Ecosistémicos2017Lucas, C., Ceroni, M., Baeza, S., Muñoz, A. A., & Brazeiro, A.Sensitivity of subtropical forest and savanna productivity to climate variability in South America, UruguayJournal of Vegetation Science10.1111/jvs.12475Increasing climate variability has major effects on forest productivity, as well as transitions between forest and savanna ecosystems. While drought-induced declines in tropical forest productivity and forest loss is a global concern, forest expansion in subtropical South America predicted by climate models has received little attention. In the forest–grassland transition zone encompassing Uruguay, we ask: (1) how does climate variability affect woodland productivity and at what time scales; and (2) how do different woodland types (riparian, hillside and wooded savanna) differ in their sensitivity to climate variability? is.1Thomson Reuters ISIclimate variability, fraction of photosynthetically active radiation, normalized difference vegetation index, primary productivity, rio de la plata basin, riparian forests, savanna, spot, subtropical forests, climate modeling, climate variation, drought stress, forestry production, intergovernmental panel on climate change, ndvi, photosynthetically active radiation, phytogeography, precipitation intensity, primary production, riparian forest, satellite imagery, sensitivity analysis, transition zone, tropical forest, woodland, rio de la plata, uruguay
Servicios Ecosistémicos2017Miranda, A., Altamirano, A., Cayuela, L., Lara, A., & González, M. E.Native forest loss in the Chilean biodiversity hotspot: revealing the evidenceRegional Environmental Change10.1007/s10113-016-1010-7Stretching over 4300 km north to south, Chile is a special country with complicated landscapes and rich biodiversity. Accurate and timely updated land cover map of Chile in detailed classification categories is highly demanded for many applications. A conclusive land cover map integrated from multi-seasonal mapping results and a seasonal dynamic map series were produced using Landsat 8 imagery mainly acquired in 2013 and 2014, supplemented by MODIS Enhanced Vegetation Index data, high resolution imagery on Google Earth, and Shuttle Radar Topography Mission DEM data. The overall accuracy is 80% for the integrated map at level 1 and 73% for level 2 based on independent validation data. Accuracies for seasonal map series were also assessed, which is around 70% for each season, greatly improved by integrated use of seasonal information. The importance of growing season imagery was proved in our analysis. The analysis of the spatial variation of accuracies among various ecoregions indicates that the accuracy for land cover mapping decreases gradually from central Chile to both north and south. More mapping efforts for those ecoregions are needed. In addition, the training dataset includes sample points spatially distributed in the whole country, temporally distributed throughout the year, and categorically encompassing all land cover types. This training dataset constitutes a universal sample set allowing us to map land cover from any Landsat 8 image acquired in Chile without additional ad hoc training sample collection. is.1Thomson Reuters ISIdeforestation, exotic tree plantation, land use and land cover change, remote sensing, temperate forest
Biogeoquímica2017Scaff, L., Rutllant, J. A., Rahn, D., Gascoin, S., & Rondanelli, R.Meteorological Interpretation of Orographic Precipitation Gradients along an Andes West Slope Basin at 30°S (Elqui Valley, Chile)Journal of Hydrometeorology10.1175/JHM-D-16-0073.1This paper summarizes the results of an intercomparison project with Earth System Models of Intermediate Complexity (EMICs) undertaken in support of the Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report (AR5). The focus is on long-term climate projections designed to 1) quantify the climate change commitment of different radiative forcing trajectories and 2) explore the extent to which climate change is reversible on human time scales. All commitment simulations follow the four representative concentration pathways (RCPs) and their extensions to year 2300. Most EMICs simulate substantial surface air temperature and thermosteric sea level rise commitment following stabilization of the atmospheric composition at year-2300 levels. The meridional overturning circulation (MOC) is weakened temporarily and recovers to near-preindustrial values in most models for RCPs 2.6-6.0. The MOC weakening is more persistent for RCP8.5. Elimination of anthropogenic CO2 emissions after 2300 results in slowly decreasing atmospheric CO2 concentrations. At year 3000 atmospheric CO2 is still at more than half its year-2300 level in all EMICs for RCPs 4.5-8.5. Surface air temperature remains constant or decreases slightly and thermosteric sea level rise continues for centuries after elimination of CO2 emissions in all EMICs. Restoration of atmospheric CO2 from RCP to preindustrial levels over 100-1000 years requires large artificial removal of CO2 from the atmosphere and does not result in the simultaneous return to preindustrial climate conditions, as surface air temperature and sea level response exhibit a substantial time lag relative to atmospheric CO2. is.3Thomson Reuters ISIcold fronts, cutoff lows, orographic effects, precipitation, synoptic climatology, valley/mountain flows, cold front, meteorology, orographic effect, precipitation (climatology), slope, streamflow, synoptic meteorology, andes, chile, coquimbo, elqui valley
Servicios Ecosistémicos2017Urrutia-Jalabert, R., Malhi, Y., & Lara, A.Soil respiration and mass balance estimation of fine root production in Fitzroya cupressoides forests of southern ChileEcosphere10.1002/ecs2.1640The soil carbon dynamics of southern hemisphere temperate rainforests have rarely been studied. Here, we report for the first time soil CO2 effluxes and their partitioning for medium-age and old-growth Fitzroya cupressoides forests growing under contrasting environmental conditions in the Coastal Range and Andean Cordillera of southern Chile. Fitzroya is a high biomass and one of the longest lived species in the world. We characterized soil respiration patterns over almost 2 yr. Annual soil respiration was slightly higher in younger forests from the Coastal Range compared with Andean forests during the first studied year (6.37–6.66 vs. 5.06–6.14 Mg C·ha−1·yr−1), and significantly higher during the second year mainly due to a warmer and drier summer (8.08–8.64 vs. 4.98–5.35 Mg C·ha−1·yr−1). Therefore, warmer and drier conditions, likely to become more common in this region under future climate change, were associated with significantly higher respiration in the shallow soils of the coast, but not in the Andes. A higher proportion of autotrophic respiration was found in the Coastal Range forest probably due to a much higher fine root biomass in this site. However, fine root productivity, an important contributor of belowground carbon fluxes, was a little lower (not significantly) in the coastal site (0.81 ± 0.60 vs. 1.50 ± 0.42 Mg C·ha−1·yr−1), indicating a longer root residence time in forests from this area. Soil CO2 effluxes from these forests and their root productivity are at the lower end of values recorded for other mature and old-growth temperate wet forests worldwide. The intrinsic longevity and the particularly poor soils and rainy conditions where these forests grow may influence these facts. Interannual climate variability appears to be especially important for soil respiration in the Coastal Range due to the more Mediterranean climate influence and shallow, poor water retention soils in this area. is.8Thomson Reuters ISIautotrophic and heterotrophic respiration, climate change, co2 efflux, fine root productivity, old-growth forests, southern south america, temperate rainforests, temperature sensitivity
Modelación y Sistemas de Observación2017Villalobos, A. M., Barraza, F., Jorquera, H., & Schauer, J. J.Wood burning pollution in southern Chile: PM2.5 source apportionment using CMB and molecular markersEnvironmental PollutionVer ficha10.1016/j.envpol.2017.02.069Temuco is a mid-size city representative of severe wood smoke pollution in southern Chile; i.e., ambient 24-h PM2.5 concentrations have exceeded 150 μg/m3 in the winter season and the top concentration reached 372 μg/m3 in 2010. Annual mean concentrations have decreased but are still above 30 μg/m3. For the very first time, a molecular marker source apportionment of ambient organic carbon (OC) and PM2.5 was conducted in Temuco. Primary resolved sources for PM2.5 were wood smoke (37.5%), coal combustion (4.4%), diesel vehicles (3.3%), dust (2.2%) and vegetative detritus (0.7%). Secondary inorganic PM2.5 (sulfates, nitrates and ammonium) contributed 4.8% and unresolved organic aerosols (generated from volatile emissions from incomplete wood combustion), including secondary organic aerosols, contributed 47.1%. Adding the contributions of unresolved organic aerosols to those from primary wood smoke implies that wood burning is responsible for 84.6% of the ambient PM2.5 in Temuco. This predominance of wood smoke is ultimately due to widespread poverty and a lack of efficient household heating methods. The government has been implementing emission abatement policies but achieving compliance with ambient air quality standards for PM2.5 in southern Chile remains a challenge. in pressThomson Reuters ISIcmb-mm, fuel poverty, source apportionment, southern chile, sustainable urban development, wood burning, aerosols, air quality, air quality standards, coal dust, heating, organic carbon, regulatory compliance, smoke, sulfur compounds, urban growth, wood, coal combustion, ammonia, nitrate, sulfate, aerosol, air pollutant, coal, dust, nitric acid derivative, particulate matter, atmospheric pollution, burning, sustainable development, urban development, air pollution, air quality standard, ambient air, article, combustion, exhaust gas, poverty, secondary organic aerosol, urban area, vegetation debris, analysis, chemistry, chile, city, environmental monitoring, fire, season, araucania, temuco, air pollutants, cities, fires, nitrates, seasons, sulfates
Dinámica del Clima2017Zambrano-Bigiarini, M., Nauditt, A., Birkel, C., Verbist, K., & Ribbe, L.Temporal and spatial evaluation of satellite-based rainfall estimates across the complex topographical and climatic gradients of ChileHydrol. Earth Syst. Sci.10.5194/hess-21-1295-2017Accurate representation of the real spatio-temporal variability of catchment rainfall inputs is currently severely limited. Moreover, spatially interpolated catchment precipitation is subject to large uncertainties, particularly in developing countries and regions which are difficult to access. Recently, satellite-based rainfall estimates (SREs) provide an unprecedented opportunity for a wide range of hydrological applications, from water resources modelling to monitoring of extreme events such as droughts and floods.This study attempts to exhaustively evaluate – for the first time – the suitability of seven state-of-the-art SRE products (TMPA 3B42v7, CHIRPSv2, CMORPH, PERSIANN-CDR, PERSIAN-CCS-Adj, MSWEPv1.1, and PGFv3) over the complex topography and diverse climatic gradients of Chile. Different temporal scales (daily, monthly, seasonal, annual) are used in a point-to-pixel comparison between precipitation time series measured at 366 stations (from sea level to 4600 m a.s.l. in the Andean Plateau) and the corresponding grid cell of each SRE (rescaled to a 0.25° grid if necessary). The modified Kling–Gupta efficiency was used to identify possible sources of systematic errors in each SRE. In addition, five categorical indices (PC, POD, FAR, ETS, fBIAS) were used to assess the ability of each SRE to correctly identify different precipitation intensities.Results revealed that most SRE products performed better for the humid South (36.4–43.7° S) and Central Chile (32.18–36.4° S), in particular at low- and mid-elevation zones (0–1000 m a.s.l.) compared to the arid northern regions and the Far South. Seasonally, all products performed best during the wet seasons (autumn and winter; MAM–JJA) compared to summer (DJF) and spring (SON). In addition, all SREs were able to correctly identify the occurrence of no-rain events, but they presented a low skill in classifying precipitation intensities during rainy days. Overall, PGFv3 exhibited the best performance everywhere and for all timescales, which can be clearly attributed to its bias-correction procedure using 217 stations from Chile. Good results were also obtained by the research products CHIRPSv2, TMPA 3B42v7 and MSWEPv1.1, while CMORPH, PERSIANN-CDR, and the real-time PERSIANN-CCS-Adj were less skillful in representing observed rainfall. While PGFv3 (currently available up to 2010) might be used in Chile for historical analyses and calibration of hydrological models, the high spatial resolution, low latency and long data records of CHIRPS and TMPA 3B42v7 (in transition to IMERG) show promising potential to be used in meteorological studies and water resource assessments. We finally conclude that despite improvements of most SRE products, a site-specific assessment is still needed before any use in catchment-scale hydrological studies. is.2Thomson Reuters ISIcatchments, clock and data recovery circuits (cdr circuits), developing countries, runoff, sea level, systematic errors, complex topographies, high spatial resolution, meteorological studies, precipitation intensity, precipitation time series, resource assessments, spatiotemporal variability, water resources modelling, rain, catchment, climate conditions, drought, environmental monitoring, extreme event, flood, hydrological modeling, hydrometeorology, precipitation (climatology), precipitation assessment, rainfall, satellite data, software, spatiotemporal analysis, time series, topography, water resource, chile
Biogeoquímica2017Carrasco, C., Karstensen, J., & Farias, L.On the Nitrous Oxide Accumulation in Intermediate Waters of the Eastern South Pacific OceanFrontiers in Marine Science10.3389/fmars.2017.00024Nitrous oxide (N2O) is a powerful greenhouse gas principally produced by nitrification and denitrification in the marine environment. Observations were made in the eastern South Pacific (ESP), between 10° and 60°S, and ~75°–88°W, from intermediate waters targeting Antarctic Intermediate Water (AAIW) at potential density of 27.0–27.1 kg m−3. Between 60° and 20°S, a gradual equatorward increase of N2O from 8 to 26 nmol L−1 was observed at density 27.0–27.1 kg m−3 where AAIW penetrates. Positive correlations were found between apparent N2O production (ΔN2O) and O2 utilization (AOU), and between ΔN2O and NO−3NO3−, which suggested that local N2O production is predominantly produced by nitrification. Closer to the equator, between 20° and 10°S at AAIW core, a strong N2O increase up to 75 nmol L−1 was observed. Because negative correlations were found between ΔN2O vs. NO−3NO3− and ΔN2O vs. N* (a Nitrogen deficit index) and because ΔN2O and AOU do not follow a linear trend, we suspect that, in addition to nitrification, denitrification also takes place in N2O cycling. By making use of water mass mixing analyses, we show that an increase in N2O occurs in the region where high oxygen from AAIW merges with low oxygen from Equatorial Subsurface Water (ESSW), creating favorable conditions for local N2O production. We conclude that the non-linearity in the relationship between N2O and O2 is a result of mixing between two water masses with very different source characteristics, paired with the different time frames of nitrification and denitrification processes that impact water masses en route before they finally meet and mix in the ESP region.
Dimensión Humana2017Moraga Sariego, P.La Definición de Nuevos Estándares en Materia de Participación Ciudadana en el Sistema de Evaluación de Impacto AmbientalRevista Derecho del Estado10.18601/01229893.n38.07La Ley 19.300 sobre Bases Generales del Medio Ambiente del año 1994, brindó el primer marco legal para la protección ambiental en el país, en el contexto de la Cumbre de Río realizada dos años antes. Luego de las recomendaciones efectuadas por la OCDE en el sentido de fortalecer la institucionalidad ambiental (2005), el legislador dicta la Ley N°20.417 que introduce la reforma ambiental (2010) y la Ley N°20.600 que crea los Tribunales Ambientales (2012). La primera amplía el ámbito de aplicación de la participación ciudadana del sistema de evaluación de impacto ambiental, sin embargo es el trabajo jurisprudencial del Segundo Tribunal Ambiental el que permitirá comprender el real alcance de la modificación legislativa. Esta judicatura especializada desarrolla nuevos estándares de participación ciudadana en el marco del proyecto de la Empresa de Ferrocarriles del Estado. Se trata de una interpretación amplia del principio en miras a una aplicación real y no únicamente formal del mismo, lo que contribuye al fortalecimiento de esta institución en relación al principio de acceso a la información y a la justicia en materia ambiental., ScieLO y Latindex
Modelación y Sistemas de Observación2017de la Fuente, A., Rojas, M., Mac-Lean, C.A human-scale perspective on global warming: Zero emission year and personal quotesPloS one10.1371/journal.pone.0179705This article builds on the premise that human consumption of goods, food and transport are the ultimate drivers of climate change. However, the nature of the climate change problem (well described as a tragedy of the commons) makes it difficult for individuals to recognise their personal duty to implement behavioural changes to reduce greenhouse gas emissions. Consequently, this article aims to analyse the climate change issue from a human-scale perspective, in which each of us has a clearly defined personal quota of CO2 emissions that limits our activity and there is a finite time during which CO2 emissions must be eliminated to achieve the “well below 2 °C” warming limit set by the Paris Agreement of 2015 (COP21). Thus, this work’s primary contribution is to connect an equal per capita fairness approach to a global carbon budget, linking personal levels with planetary levels. Here, we show that a personal quota of 5.0 tons of CO 2 yr -1 p -1 is a representative value for both past and future emissions; for this level of a constant per capita emissions and without considering any mitigation, the global accumulated emissions compatible with the “well below 2 °C” and 2 °C targets will be exhausted by 2030 and 2050, respectively. These are references years that provide an order of magnitude of the time that is left to reverse the global warming trend. More realistic scenarios that consider a smooth transition toward a zero-emission world show that the global accumulated emissions compatible with the “well below 2 °C” and 2 °C targets will be exhausted by 2040 and 2080, respectively. Implications of this paper include a return to personal responsibility following equity principles among individuals, and a definition of boundaries to the personal emissions of CO2 . Reuters ISIcarbon dioxide, article, carbon cycle, carbon dioxide equivalent, carbon footprint, climate change, environmental parameters, global carbon budget, greenhouse effect, greenhouse gas, human, mathematical model, model for the assessment of greenhouse gas induced climate change, zero emission year, temperature, global warming, humans
Modelación y Sistemas de Observación2017Escribano, J., Boucher, O., Chevallier, F., Huneeus, N.Impact of the choice of the satellite aerosol optical depth product in a sub-regional dust emission inversionAtmospheric Chemistry and Physics10.5194/acp-17-7111-2017Mineral dust is the major continental contributor to the global atmospheric aerosol burden with important effects on the climate system. Regionally, a large fraction of the emitted dust is produced in North Africa, however the total emission flux from this region is still highly uncertain. In order to reduce these uncertainties, emission estimates through top-down approaches (i.e., usually models constrained by observations) had been successfully developed and implemented. Such studies usually rely on a single observational dataset and propagate the possible observational errors of this dataset onto the emission estimates. In this study, aerosol optical depth (AOD) products from five different satellites are assimilated one by one in a source inversion system to estimate dust emission fluxes over northern Africa and the Arabian Peninsula. We estimate mineral dust emissions for the year 2006 and discuss the impact of the assimilated dataset on the analysis. We find a relatively large dispersion in flux estimates among the five experiments, which can likely be attributed to differences in the assimilated observation datasets and their associated error statistics. We also show how the assimilation of a variety of AOD products can help to identify systematic errors in models. Reuters ISIaerosol, data assimilation, data set, dust, emission, optical depth, africa, arabian peninsula
Servicios Ecosistémicos2017Ortega-Solís, G., Díaz, I., Mellado-Mansilla, D., Tello, F., Moreno, R., Tejo, C.Ecosystem engineering by Fascicularia bicolor in the canopy of the South-American temperate rainforestForest Ecology and Management10.1016/j.foreco.2017.06.020Ecosystem engineers are organisms that modify habitats and resource flows, they therefore could have a disproportionate impact on the diversity of ecological communities. Evidence suggests that trash basket epiphytes (TBE) can be considered ecosystem engineers of forest canopies, due to their relationship with arboreal soil availability and treetop communities. Here we evaluated whether the TBE Fascicularia bicolor (Bromeliaceae), modulates temperature and humidity in the forest canopy. We also investigated if this bromeliad is related with greater arboreal soil accumulation and is associated to higher diversity of other epiphytic plants and invertebrates in the canopy of the South-American temperate rainforest (SATR), in Chile. We measured temperature and humidity in ten trees within the forest before and after the experimental addition of F. bicolor. We also related the presence of F. bicolor with occurrence of soil macrofauna and other canopy dwelling plants in a comparative field survey.
Temperature variability in the canopy was reduced by F. bicolor. Soil availability was higher in siteswith mats of F. bicolor. The richness of vascular epiphytes was unaltered by the presence of F. bicolor,but species composition differed between sites with and without mats on each tree. At the group level,the cover of lichens and bryophytes was greater in sites without F. bicolor, while vascular epiphytes showa larger cover in sites with F. bicolor. The species richness of invertebrates increased in treetop sites colonized by F. bicolor but species composition was not different from soil in branch bifurcations. Our resultsshow that F. bicolor must be considered in forest management practices to determine which trees must belogged, in order to preserve the viability of populations of these key organisms in the treetops of South-American temperate rainforests. Reuters ISIanimals, ecology, ecosystems, professional aspects, soils, ecosystem engineering, forest management practices, measured temperatures, soil accumulations, species composition, temperate rainforest, temperature and humidities, temperature variability, forestry, bryophyte, colonization, epiphyte, forest canopy, invertebrate, lichen, monocotyledon, rainforest, species richness, temperate environment, humidity, south america, bromeliaceae, bryophytes, fascicularia bicolor, invertebrata
Modelación y Sistemas de Observación2017Barraza, F., Lambert, F., Jorquera, H., Villalobos, A. M., Gallardo, L.Temporal evolution of main ambient PM 2.5 sources in Santiago, Chile, from 1998 to 2012Atmospheric Chemistry and Physics DiscussionsVer ficha10.5194/acp-2017-18The inhabitants of Santiago in Chile have been exposed to harmful levels of air pollutants for decades. The city’s poor air quality is a result of sustained emissions and stable atmospheric conditions, averse to mixing and ventilation and favorable for the formation of oxidants and secondary aerosols. Identifying and quantifying the sources that contribute to the ambient levels of pollutants is key for designing adequate mitigation measures. Knowledge about the temporal evolution of the contribution of each source to ambient pollution levels is also paramount to evaluate the effectiveness of pollution reduction measures that have been implemented in the past decades. Here, we quantify the main sources that have contributed to fine
particulate matter (PM 2.5 ) between 1998 and 2012 in Santiago’s center by using two different source-receptor models (PMF 5.0 and Unmix 6.0), that re applied to elemental measurements on 1243 24-hour filter samples of ambient PM 2.5 collected between April-1998 to August-2012. Both models resolve six sources that contribute to ambient PM 2.5 : motor vehicles (37%), industrial sources (19%), copper smelters (14%), wood burning (12%), coastal sources (10%), and urban dust (3%).
Our results show that over the 15 years analyzed here, the emissions from motor vehicles, industrial sources, copper
smelters, and coastal sources declined by about 21, 39, 81, 59, and 59% respectively, while wood burning didn’t change and urban dust increase by 72%. These changes are consistent with emission reduction measures, such as improved vehicle and smelting technology, introduction of low sulfur fuel for vehicles and natural gas for industrial processes, emission controls for vehicles, public transport improvements etc.. However, it is also apparent that the mitigation expected from improved public transport, vehicle technology, and fuel has been largely nullified by the ever-rising number of private vehicle journeys in the past decade. As a consequence, Santiago still experiences PM 2.5 levels above the annual and 24-hours Chilean and World Health Organization standards in pressThomson Reuters ISI
Dinámica del clima, MOS2017González-Reyes, A., McPhee, J., Christie, D. A., Le Quesne, C., Szejner, P., Masiokas, M. H., Villalba, R., Muñoz, A. A., Crespo, S.Spatio-temporal variations in hydroclimate across the Mediterranean Andes (30°-37°S) since the early 20th centuryJournal of Hydrometeorology10.1175/JHM-D-16-0004.1In the Mediterranean Andes (MA; 30°S–37°S), the main rivers are largely fed by melting snowpack and provide fresh water to around 10 million people on both sides of the Cordillera. Water resources in the MA are under pressure due to the extensive development of industrial agriculture and mining activities. This pressure is increasing as the region faces one of its worst recorded droughts. Previous studies have pointed to the El Niño Southern Oscillation (ENSO) as the main climatic force impacting the MA. However, the role of decadal and multidecadal climate variability, their spatial patterns and the recurrence of long-term droughts, remains poorly studied. In this contribution to a better understanding of these factors, spatial and temporal patterns of hydroclimatic variability are analyzed using an extensive database of streamflow, precipitation, and snowpack covering the period between 1910 – 2011. These analyses are based on the combination of correlation, principal components and kernel-estimation techniques. Despite a general common pattern across the MA region, our results identify two hydroclimatic sub-regions, located north and south of 34°S. While the interannual variability associated with ENSO is slightly stronger north of 34°S, the variability associated with the Pacific Decadal Oscillation (PDO) and/or the Inter-decadal Pacific Oscillation index (IPO) shows similar patterns in both regions. However, variations produced by the IPO forcing seem to be greater in the southern sub-region since 1975. Our estimations on drought recurrence reveal a generalized increase in dry extremes since the 1950’s. These findings suggest that the northern MA are more vulnerable to changes in hydrology and climate than the southern MA. in pressThomson Reuters ISIclimate variability, decadal variability, south america, streamflow, climate change, climate forcing, decadal variation, drought, el nino-southern oscillation, pacific decadal oscillation, spatiotemporal analysis, twentieth century, andes, mediterranean region
Dinámica del clima2017Guimberteau, M., Ciais, M., Ducharne, A., Boisier, J. P., Dutra Aguiar A. P., Biemans, H., De Deurwaerder, H., Galbraith, D., Kruijt, B., Langerwisch, F., Poveda, G., Rammig, A., Rodriguez, D. A., Tejada, G., Thonicke, K., Von Randow, C., Von Randow, R. C. S., Zhang, K., Verbeeck, H.Impacts of future deforestation and climate change on the hydrology of the Amazon Basin: a multi-model analysis with a new set of land-cover change scenariosHydrology and Earth System Sciences10.5194/hess-21-1455-2017Deforestation in Amazon is expected to decrease evapotranspiration (ET) and to increase soil moisture and river discharge under prevailing energy-limited conditions. The magnitude and sign of the response of ET to deforestation depend both on the magnitude and regional patterns of land-cover change (LCC), as well as on climate change and CO2 levels. On the one hand, elevated CO2 decreases leaf-scale transpiration, but this effect could be offset by increased foliar area density. Using three regional LCC scenarios specifically established for the Brazilian and Bolivian Amazon, we investigate the impacts of climate change and deforestation on the surface hydrology of the Amazon Basin for this century, taking 2009 as a reference. For each LCC scenario, three land surface models (LSMs), LPJmL-DGVM, INLAND-DGVM and ORCHIDEE, are forced by bias-corrected climate simulated by three general circulation models (GCMs) of the IPCC 4th Assessment Report (AR4). On average, over the Amazon Basin with no deforestation, the GCM results indicate a temperature increase of 3.3 °C by 2100 which drives up the evaporative demand, whereby precipitation increases by 8.5 %, with a large uncertainty across GCMs. In the case of no deforestation, we found that ET and runoff increase by 5.0 and 14 %, respectively. However, in south-east Amazonia, precipitation decreases by 10 % at the end of the dry season and the three LSMs produce a 6 % decrease of ET, which is less than precipitation, so that runoff decreases by 22 %. For instance, the minimum river discharge of the Rio Tapajós is reduced by 31 % in 2100. To study the additional effect of deforestation, we prescribed to the LSMs three contrasted LCC scenarios, with a forest decline going from 7 to 34 % over this century. All three scenarios partly offset the climate-induced increase of ET, and runoff increases over the entire Amazon. In the south-east, however, deforestation amplifies the decrease of ET at the end of dry season, leading to a large increase of runoff (up to +27 % in the extreme deforestation case), offsetting the negative effect of climate change, thus balancing the decrease of low flows in the Rio Tapajós. These projections are associated with large uncertainties, which we attribute separately to the differences in LSMs, GCMs and to the uncertain range of deforestation. At the subcatchment scale, the uncertainty range on ET changes is shown to first depend on GCMs, while the uncertainty of runoff projections is predominantly induced by LSM structural differences. By contrast, we found that the uncertainty in both ET and runoff changes attributable to uncertain future deforestation is low. Reuters ISIcarbon dioxide, climate models, deforestation, drought, evapotranspiration, hydrology, runoff, soil moisture, evaporative demands, general circulation model, land surface models, land-cover change, runoff projections, structural differences, surface hydrology, temperature increase, climate change, climate effect, future prospect, land cover, land surface, precipitation (climatology), regional pattern, river discharge, scenario analysis, amazon basin, amazonia, bolivia, brazil, tapajos river
Biogeoquímica2017Joly, D., Santoro, C. M., Gayo, E. M., Ugalde, P.C., March, R. J., Carmona, R., Marguerie, D., Latorre, C.Late Pleistocene Fuel Management and Human Colonization of the Atacama Desert, Northern ChileLatin American Antiquity10.1017/laq.2016.8Hunter-gatherers collected and used various woody species depending on the landscape, availability of plant communities, and sociocultural considerations. With extensive paleo-wetlands and groundwater-fed oases, the Atacama Desert was interspersed with riparian woodlands that provided vital resources (fuel, water, and game) at the end of the Pleistocene in areas such as the Pampa del Tamarugal (PdT) basin. We use anthracological analyses to determine the fuel management strategies of hunter-gatherer societies in this hyperarid environment and explore whether the “Principle of Least Effort” applies. First, we present the combustion qualities and characteristics of woody taxa from the Atacama and analyze possible exploitation strategies. Second, we use anthracological analyses from Quebrada Maní 12 (QM12), a late Pleistocene archaeological site (dated from 12,750 to 11,530 cal B.P.) located in the PdT basin, to show the prevalence of two woody species that were either freshly collected or gathered (very likely on purpose) from subfossil wood. Our results suggest that fuel selection strategies were based on prior knowledge of the qualities of these woody taxa and how they burned. Thus we conclude that fuel management was part of a number of social and economic decisions that allowed for effective colonization of this region. Furthermore, we stress the need for caution when using charcoal to exclusively date archaeological sites located in desert environments.
Hunter-gatherers collected and used various woody species depending on the landscape, availability of plant communities, and sociocultural considerations. With extensive paleo-wetlands and groundwater-fed oases, the Atacama Desert was interspersed with riparian woodlands that provided vital resources (fuel, water, and game) at the end of the Pleistocene in areas such as the Pampa del Tamarugal (PdT) basin. We use anthracological analyses to determine the fuel management strategies of hunter-gatherer societies in this hyperarid environment and explore whether the “Principle of Least Effort” applies. First, we present the combustion qualities and characteristics of woody taxa from the Atacama and analyze possible exploitation strategies. Second, we use anthracological analyses from Quebrada Maní 12 (QM12), a late Pleistocene archaeological site (dated from 12,750 to 11,530 cal B.P.) located in the PdT basin, to show the prevalence of two woody species that were either freshly collected or gathered (very likely on purpose) from subfossil wood. Our results suggest that fuel selection strategies were based on prior knowledge of the qualities of these woody taxa and how they burned. Thus we conclude that fuel management was part of a number of social and economic decisions that allowed for effective colonization of this region. Furthermore, we stress the need for caution when using charcoal to exclusively date archaeological sites located in desert environments.
Las sociedades de cazadores-recolectores del Cono Sur recolectaron y utilizaron diversas especies leñosas dependiendo de las condiciones del paisaje, las comunidades de plantas disponibles y consideraciones socio-culturales. Las cuencas hidrográficas, como Pampa del Tamarugal (PdT) en el Desierto de Atacama, contaban con extensos paleo-humedales y oasis sustentados con aguas subterráneas, intercalados con bosques ribereños que proporcionaron recursos vitales (combustible, agua y caza) hacia finales del Pleistoceno. Este estudio utiliza análisis antracológicos para definir las estrategias empleadas por los grupos de cazadores-recolectores para la gestión del combustible en este ambiente híper árido y explorar si dicho comportamiento social puede ser explicado por el “principio del menor esfuerzo”. En primer lugar, se presentan las cualidades y características de quema de los taxones leñosos del Desierto de Atacama y un análisis de sus estrategias de explotación. En segundo lugar, se utilizan los resultados de análisis antracológicos de muestras de carbones y maderas del sitio arqueológico Quebrada Maní 12 (QM12), ubicado en la PdT y asignado al Pleistoceno tardío (datado entre 12.750 y 11.530 cal a.P.). Estos muestran un predominio de dos especies leñosas recogidas como madera fresca ocolectadas, posiblemente en forma intencional, como “madera vieja”. Los resultados revelan que las estrategias de selección del material para la combustión requirieron de un conocimiento previo acerca de cómo se quemaban los taxones leñosos. Consecuentemente, se concluye que la gestión del combustible formó parte de las decisiones sociales y económicas que permitieron una colonización efectiva de esta región. Finalmente, se señala la necesidad de cautela a la hora de interpretar las cronologías arqueológicas basadas exclusivamente en dataciones sobre carbón en sitios ubicados en desiertos. Reuters AHCI-
Modelación y Sistemas de Observación2017Anet, J. G., Steinbacher, M., Gallardo, L., Velásquez Álvarez, P. A., Emmenegger, L., Buchmann, B.Surface ozone in the Southern Hemisphere: 20 years of data from a site with a unique setting in El Tololo, ChileAtmospheric Chemistry and Physics10.5194/acp-17-6477-2017The knowledge of surface ozone mole fractions and their global distribution is of utmost importance due to the impact of ozone on human health and ecosystems and the central role of ozone in controlling the oxidation capacity of the troposphere. The availability of long-term ozone records is far better in the Northern than in the Southern Hemisphere, and recent analyses of the seven accessible records in the Southern Hemisphere have shown inconclusive trends. Since late 1995, surface ozone is measured in situ at "El Tololo", a high-altitude (2200 m a.s.l.) and pristine station in Chile (30° S, 71° W). The dataset has been recently fully quality controlled and reprocessed. This study presents the observed ozone trends and annual cycles and identifies key processes driving these patterns. From 1995 to 2010, an overall positive trend of  ∼  0.7 ppb decade−1 is found. Strongest trends per season are observed in March and April. Highest mole fractions are observed in late spring (October) and show a strong correlation with ozone transported from the stratosphere down into the troposphere, as simulated with a model. Over the 20 years of observations, the springtime ozone maximum has shifted to earlier times in the year, which, again, is strongly correlated with a temporal shift in the occurrence of the maximum of simulated stratospheric ozone transport at the site. We conclude that background ozone at El Tololo is mainly driven by stratospheric intrusions rather than photochemical production from anthropogenic and biogenic precursors. The major footprint of the sampled air masses is located over the Pacific Ocean. Therefore, due to the negligible influence of local processes, the ozone record also allows studying the influence of El Niño and La Niña episodes on background ozone levels in South America. In agreement with previous studies, we find that, during La Niña conditions, ozone mole fractions reach higher levels than during El Niño conditions. Reuters ISIair mass, atmospheric transport, correlation, el nino, la nina, observational method, ozone, photochemistry, southern hemisphere, stratosphere, trend analysis, troposphere, chile, pacific ocean
Modelación y Sistemas de Observación2017Aguirre, C., Rutllant, J., Falvey, M.Wind waves climatology of the Southeast Pacific OceanInternational Journal of Climatology10.1002/joc.5084The climatology of wind waves over the Southeast Pacific is analysed using a 32-year hindcast from the WaveWatch III model, complemented by satellite-derived significant wave height (SWH) and buoy measurements for validation. Using partitioned spectral data, a regional climatology of wind sea and swell parameters was constructed. In general, the simulated SWH shows a good agreement with satellite and in situ SWH measurements, although the model appears to have a spatially uniform bias of approximately 0.3 m. The spatial pattern of SWH is clearly influenced by the meridional variation of mean surface wind speed, where the stronger winds over the Southern Ocean play a significant role generating higher waves at higher latitudes. Nevertheless, regional features are observed in the annual variability of SWH, which are associated with the existence of atmospheric coastal low-level jets off the coast of Peru and central Chile. In particular, the seasonal variation of these synoptic scale jets shows a direct relationship with the annual variability of SWH and with the probability of occurrence of wind sea conditions. Off the coast of Peru at approximately 15 ∘ S the coastal low-level jet is strongest during austral winter, increasing the wind sea SWH. In contrast, off central Chile, there is an important increase of wind sea SWH during summer. The seasonal variation of the wind sea component leads to a contrasting seasonal variation of the total SWH at these locations: off Peru the coastal jet amplifies the annual variability of SWH, while off Central Chile the annual variability of SWH is suppressed by the presence of the coastal jet. Although the general conclusions of this research are considered to be robust, we discuss the limitations of the spectral partitioning method used to distinguish wind sea and swell-sea states. Reuters ISIatmospheric low-level coastal jets, southeast pacific, swell, wave climatology, wind sea, climatology, coastal zones, ocean currents, swelling, wind, coastal jets, probability of occurrence, seasonal variation, significant wave height, spectral partitioning, wave climatologies, fighter aircraft, jet flow, wave climate, wind velocity, wind wave, chile, pacific ocean, pacific ocean (south)
Dimensión Humana2017Montané, M., Cáceres, G., Villena, M., O’Ryan, R.Techno-Economic Forecasts of Lithium Nitrates for Thermal Storage SystemsSustainability10.3390/su9050810Thermal energy storage systems (TES) are a key component of concentrated solar power (CSP) plants that generally use a NaNO3/KNO3 mixture also known as solar salt as a thermal storage material. Improvements in TES materials are important to lower CSP costs, increase energy efficiency and competitiveness with other technologies. A novel alternative examined in this paper is the use of salt mixtures with lithium nitrate that help to reduce the salt’s melting point and improve thermal capacity. This in turn allows the volume of materials required to be reduced. Based on data for commercial plants and the expected evolution of the lithium market, the technical and economic prospects for this alternative are evaluated considering recent developments of Lithium Nitrates and the uncertain future prices of lithium. Through a levelized cost of energy (LCOE) analysis it is concluded that some of the mixtures could allow a reduction in the costs of CSP plants, improving their competitiveness. Reuters ISIcsp, lithium based nitrates, lithium market, thermal energy storage, competitiveness, economic analysis, energy conservation, energy efficiency, lithium, melting, nitrate, reduction, solar power, storage, technical efficiency, thermal power
Dimensión Humana2017Hasbún-Mancilla, J. O., Aldunce-Ide, P. P., Blanco-Wells, G., Browne-Sartori, R.Encuadres del cambio climático en Chile: Análisis de discurso en prensa digitalConvergenciaEncuadres del cambio climático en Chile: Análisis de discurso en prensa digital
Biogeoquímica2017Osorio, D., Capriles, J. M., Ugalde, P. C., Herrera, K., Salas, C., Sepulveda, M., Gayo, E. M., Latorre, C., Jackson, D., Santoro, C. M.Hunter-Gatherer Mobility Strategies in the High Andes of northern Chile during the late Pleistocene-early Holocene Transition (ca. 11,500-9,500 CAL B.P.)Journal of Field Archaeology10.1080/00934690.2017.1322874The high Andes of western South America feature extreme ecological conditions that impose important physiological constraints on humans including high-elevation hypoxia and cold stress. This leads to questions regarding how these environments were colonized by the first waves of humans that reached them during the late Pleistocene. Based on previous research, and aided by
human behavioral ecology principles, we assess hunter-gatherer behavioral strategies in the Andean highlands during the late Pleistocene and early Holocene. Specifically, we formulate three mobility strategies and their archaeological expectations and test these using technological and subsistence evidence from the six earliest well-dated highland sites in northern Chile. Our results
suggest that all of the studied sites were temporarily occupied for hunting, processing animals, and toolkit maintenance. The sites also exhibit shared technological features within a curatorial strategy albeit with different occupation intensities. From this evidence, we infer that the initial occupations
of the highlands were logistical and probably facilitated by increased local resource availability during a period of environmental amelioration. Reuters AHCI - ISIandes, foraging, hunter-gatherers, mobility strategies, northern chile
Dimensión Humana2017Moraga Sariego, P., Mieckevi, S.Análisis crítico de la judicialización del cambio climático y la economía baja en carbono frente a las categorías tradicionales del derechoRevista de Derecho, Universidad de ConcepciónEl desarrollo de casos judiciales vinculados a los efectos y problemáticas del cambio climático comienza en los alrededores del año 2004 en Estados Unidos, para propagarse luego a Europa y Asia, desafiando a las categorías tradicionales del derecho frente a la necesidad de bridar una protección efectiva a los bienes jurídicos en juego. La regulación internacional definida recientemente en el marco del Acuerdo de París, agrega nuevos elementos para la profundización de este fenómeno, especialmente para países vulnerables, como lo es
Biogeoquímica2017Rondanelli, R.¿Cómo llueve cuando llueve en Atacama ?PRP “Generación de información y monitoreo del Fenómeno El Niño” - IGPCerca de los 24°S y enfrentando la costa oriental de Sudamérica yace el desierto de Atacama, el más árido del planeta. El pueblo de Quillagua (21.6 6°S, 69 69°W), un oasis del Río Loa que nace en los Andes alimentando por la precipitación Altiplánica del verano, presenta la precipitación anual más pequeña de la que se tiene registro en el planeta (0.05 mm/ año, Middleton, 2001). indexed
Agua y Extremos; Gobernanza e Interfaz entre Ciencia y Política2017Aldunce, P., Araya, D., Sapiain, R., Ramos, I., Lillo, G., Urquiza, A., Garreaud, R.Local Perception of Drought Impacts in a Changing Climate: The Mega-Drought in Central Chile
10.3390/su9112053Droughts are a recurrent and complex natural hazard whose frequency and magnitude are expected to increase with climate change. Despite the advances in responding and adapting to droughts (with the development of new policies, for example), droughts continue to cause serious impacts and suffering. Developing well-targeted public policies requires further research on adaptation. Specifically, understanding the public perception of drought can help to identify drivers of and barriers to adaptation and options. This research seeks to understand the public perception of drought in central Chile in order to inform adaptation-related policies and decision-making processes. This study focused on the Mega-drought, which was a protracted dry spell afflicting central Chile since 2010. Reuters ISIadaptation policy and practice, chile, climate change impacts, drought, perception, climate change, climate effect, decision making, natural hazard, policy development, social policy
Ciudades Resilientes2017Billi, M., Urquiza, A., Feres, C.Comunicación ambiental y proyectos energéticos renovables no convencionales. Análisis de contenido en medios de comunicación de masa chilenos
Revista Latina de Comunicación Social
10.4185/RLCS, 72-2017-1216ES Introducción. Se observa la tematización mediática de proyectos Energéticos Renovables No Convencionales ERNC en términos de la relevancia y tratamiento otorgados a distintas fuentes y estructuras temáticas emergentes. Metodología. Análisis de contenido con enfoque mixto sobre una muestra de 100 artículos de prensa digital chilena relacionados con ERNC, usando el marco analítico de la Teoría de Sistemas Sociales de Niklas Luhmann. Resultados y Discusión. La primacía de fuentes solares y eólicas se acompaña a una reducida claridad terminológica, que sin embargo permite construir estructuras temáticas distintas en relación con sistemas sociales como economía, ciencia, política y derecho. Las referencias medioambientales son más escasas y menos profundas, privilegiando sus aspectos evocativos y con máxima capacidad de enlace. Conclusiones. En lugar que observar a los medios como mera transmisión de racionalidades externas a ellos debería prestarse atención a su capacidad de crear realidad y representar el entorno social y medioambiental.
EN Introduction. We observe how mass media thematise Non-Conventional Renewable Energy projects NCRE in terms of relevance and treatment assigned to distinct sources and emerging thematic structures. Methodology. Mixed-approach content analysis of a sample of 100 Chilean digital press articles relating to NCRE, using the analytical framework of Niklas Luhmann’s Social Systems Theory. Results and Discussion. The predominance of solar and wind sources goes hand in hand with a low terminological clarity, which however allows mass media to build distinct thematic structures around social systems such as economy, science, politics and law. Environmental references are less frequent and shallower, privileging its evocative aspects with maximum linkage capacity. Conclusions. Instead than observing mass media as mere transmitters of rationalities external to them, more attention should be given to their ability to create realities and representing the (human and ecological) environment. Reuters ESCI
Agua y Extremos2017Borquéz González, RInterfaz ciencia-políticas públicas en Chile: una mirada a la investigación en cambio climáticoRevista Colombiana de Sociología10.15446/rcs.v40n2.66402En las últimas décadas, se han observado importantes cambios en torno a la relación entre la ciencia y la sociedad. Se ha transitado de un paradigma basado en que la ciencia está transformando la sociedad a otro que abre a la posibilidad de que la sociedad transforme la ciencia. El aporte de la esfera científica, al igual que el brindado por cada uno de los actores sociales, es fundamental para apoyar la toma de decisiones en política pública. Así lo ha demostrado el Panel Intergubernamental de Expertos sobre Cambio Climático (IPCC), que ha jugado un rol clave en la toma de acciones de la comunidad internacional. Sin embargo, la relación entre ciencia y política no ha sido suficientemente fluida en Chile. El objetivo del estudio fue identificar y analizar, a través de motodología cualitativa de carácter exploratorio, las brechas y los facilitadores de la relación entre investigadores del campo de las ciencias naturales y las políticas públicas en Chile, con énfasis en el área del cambio climático. Esto permitió analizar la estructura y la dinámica de incentivos a la actividad de las esferas científica y pública, y los mecanismos de comunicación y coordinaci;ón existentes entre ellas. Así, se identificaron ocho brechas y dos facilitadores. Resaltan el bajo interés de la esfera científica en realizar "asesorías" solicitadas por servicios públicos que generan poíticas públicas, la falta de incentivos o exigencias académicas para simplificar contenidos, así como la falta de comunicación y de interacción regular que generan una diferencia entre lo que la esfera político-administrativa espera de los científicos y la forma en que estos últimos ven como efectiva y útil su participación. Además, se observaron fallas de coordinación entre quien financia la investigación y quien genera la política pública. Los resultados también muestran que las brechas entre las esferas no se recducen únicamente al campo del cambio climático, sino que se deben también a la manera como están conformadas las estructuras científicas y políticas de Chile. indexed
Cambio de Uso de Suelo2017Castillo-Riffart, Ivan; Galleguillos, Mauricio; Lopatin, Javier; Perez-Quezada, J. F.Predicting Vascular Plant Diversity in Anthropogenic Peatlands: Comparison of Modeling Methods with Free Satellite DataRemote Sensing10.3390/rs9070681Peatlands are ecosystems of great relevance, because they have an important number of ecological functions that provide many services to mankind. However, studies focusing on plant diversity, addressed from the remote sensing perspective, are still scarce in these environments. In the present study, predictions of vascular plant richness and diversity were performed in three anthropogenic peatlands on Chiloé Island, Chile, using free satellite data from the sensors OLI, ASTER, and MSI. Also, we compared the suitability of these sensors using two modeling methods: random forest (RF) and the generalized linear model (GLM). As predictors for the empirical models, we used the spectral bands, vegetation indices and textural metrics. Variable importance was estimated using recursive feature elimination (RFE). Fourteen out of the 17 predictors chosen by RFE were textural metrics, demonstrating the importance of the spatial context to predict species richness and diversity. Non-significant differences were found between the algorithms; however, the GLM models often showed slightly better results than the RF. Predictions obtained by the different satellite sensors did not show significant differences; nevertheless, the best models were obtained with ASTER (richness: R2 = 0.62 and %RMSE = 17.2, diversity: R2 = 0.71 and %RMSE = 20.2, obtained with RF and GLM respectively), followed by OLI and MSI. Diversity obtained higher accuracies than richness; nonetheless, accurate predictions were achieved for both, demonstrating the potential of free satellite data for the prediction of relevant community characteristics in anthropogenic peatland ecosystems. © 2017 by the authors. is.7Thomson Reuters ISIaster, fen, generalized linear models, msi, oli, random forest, richness, shannon index, sphagnum, wetland, decision trees, ecology, ecosystems, forecasting, maximum likelihood, satellites, wetlands, generalized linear model, random forests, forestry
Agua y Extremos2017Cuchiara, G. C., Rappenglück, B., Rubio, M. A., Lissi, E., Gramsch, E., Garreaud, R. D.Modeling study of biomass burning plumes and their impact on urban air quality; a case study of Santiago de ChileAtmospheric EnvironmentVer ficha10.1016/j.atmosenv.2017.07.002On January 4, 2014, during the summer period in South America, an intense forest and dry pasture wildfire occurred nearby the city of Santiago de Chile. On that day the biomass-burning plume was transported by low-intensity winds towards the metropolitan area of Santiago and impacted the concentration of pollutants in this region. In this study, the Weather Research and Forecasting model coupled with Chemistry (WRF/Chem) is implemented to investigate the biomass-burning plume associated with these wildfires nearby Santiago, which impacted the ground-level ozone concentration and exacerbated Santiago's air quality. Meteorological variables simulated by WRF/Chem are compared against surface and radiosonde observations, and the results show that the model reproduces fairly well the observed wind speed, wind direction air temperature and relative humidity for the case studied. Based on an analysis of the transport of an inert tracer released over the locations, and at the time the wildfires were captured by the satellite-borne Moderate Resolution Imaging Spectroradiometer (MODIS), the model reproduced reasonably well the transport of biomass burning plume towards the city of Santiago de Chile within a time delay of two hours as observed in ceilometer data. A six day air quality simulation was performed: the first three days were used to validate the anthropogenic and biogenic emissions, and the last three days (during and after the wildfire event) to analyze the performance of WRF/Chem plume-rise model within FINNv1 fire emission estimations. The model presented a satisfactory performance on the first days of the simulation when contrasted against data from the well-established air quality network over the city of Santiago de Chile. These days represent the urban air quality base case for Santiago de Chile unimpacted by fire emissions. However, for the last three simulation days, which were impacted by the fire emissions, the statistical indices showed a decrease in the model performance. While the model showed a satisfactory evidence that wildfires plumes that originated in the vicinity of Santiago de Chile were transported towards the urban area and impacted the air quality, the model still underpredicted some pollutants substantially, likely due to misrepresentation of fire emission sources during those days. Potential uncertainties may include to the land use/land cover classifications and its characteristics, such as type and density of vegetation assigned to the region, where the fire spots are detected. The variability of the ecosystem type during the fire event might also play a role. Reuters ISIatmospheric modeling, biomass burning, plume rise model, wrf/chem, air quality, atmospheric humidity, atmospheric temperature, biomass, image reconstruction, meteorological instruments, pollution, radiometers, radiosondes, satellite imagery, weather forecasting, anthropogenic and biogenic emissions, atmospheric model, biomass-burning, ground level ozone concentration, moderate resolution imaging spectroradiometer, plume rise, weather research and forecasting models, fires, ozone, anthropogenic effect, atmospheric plume, biogenic emission, forecasting method, metropolitan area, modis, radiosonde, urban pollution, air temperature, article, circadian rhythm, combustion, humidity, land use, pasture, plume, priority journal, sensitivity analysis, simulation, summer, urban area, wind, chile, metropolitana, santiago metropolitana
Zonas Costeras2017Galán, A., Thamdrup, B., Saldías, G. S., Farías, L.Vertical segregation among pathways mediating nitrogen loss (N2 and N2O production) across the oxygen gradient in a coastal upwelling ecosystemBiogeosciences10.5194/bg-14-4795-2017The upwelling system off central Chile (36.5 S) is seasonally subjected to oxygen (O2)-deficient waters, with a strong vertical gradient in O2 (from oxic to anoxic conditions) that spans a few metres (30-50€m interval) over the shelf. This condition inhibits and/or stimulates processes involved in nitrogen (N) removal (e.g. anammox, denitrification, and nitrification). During austral spring (September 2013) and summer (January 2014), the main pathways involved in N loss and its speciation, in the form of N2 and/or N2O, were studied using 15N-tracer incubations, inhibitor assays, and the natural abundance of nitrate isotopes along with hydrographic information. Incubations were developed using water retrieved from the oxycline (25€m depth) and bottom waters (85€m depth) over the continental shelf off Concepción, Chile. Results of 15N-labelled incubations revealed higher N removal activity during the austral summer, with denitrification as the dominant N2-producing pathway, which occurred together with anammox at all times. Interestingly, in both spring and summer maximum potential N removal rates were observed in the oxycline, where a greater availability of oxygen was observed (maximum O2 fluctuation between 270 and 40€μmol€L'1) relative to the hypoxic bottom waters ( < €20€μmol€O2€L'1). Different pathways were responsible for N2O produced in the oxycline and bottom waters, with ammonium oxidation and dissimilatory nitrite reduction, respectively, as the main source processes. Ammonium produced by dissimilatory nitrite reduction to ammonium (DNiRA) could sustain both anammox and nitrification rates, including the ammonium utilized for N2O production. The temporal and vertical variability of /15N-NO3' confirms that multiple N-cycling processes are modulating the isotopic nitrate composition over the shelf off central Chile during spring and summer. N removal processes in this coastal system appear to be related to the availability and distribution of oxygen and particles, which are a source of organic matter and the fuel for the production of other electron donors (i.e. ammonium) and acceptors (i.e. nitrate and nitrite) after its remineralization. These results highlight the links between several pathways involved in N loss. They also establish that different mechanisms supported by alternative N substrates are responsible for substantial accumulation of N2O, which are frequently observed as hotspots in the oxycline and bottom waters. Considering the extreme variation in oxygen observed in several coastal upwelling systems, these findings could help to understand the ecological and biogeochemical implications due to global warming where intensification and/or expansion of the oceanic OMZs is projected. Reuters ISIbioassay, biogeochemical cycle, bottom water, continental shelf, denitrification, ecosystem dynamics, environmental gradient, global warming, nitrogen, nitrogen cycle, organic matter, oxygen, oxygen minimum layer, tracer, upwelling, vertical profile, chile
Agua y Extremos; Cambio de Uso de Suelo2017Garreaud, R., Alvarez-Garreton, C., Barichivich, J., Boisier, J. P., Christie, D., Galleguillos, M., LeQuesne, C., McPhee, J., Zambrano-Bigiarini, M.The 2010-2015 mega drought in Central Chile: Impacts on regional hydroclimate and vegetationHydrology and Earth System Sciences Discussions10.5194/hess-2017-191Since 2010 an uninterrupted sequence of dry years, with annual rainfall deficits ranging from 25 to 45 %, has prevailed in Central Chile (western South America, 30–38° S). Although intense 1- or 2-year droughts are recurrent in this Mediterranean-like region, the ongoing event stands out because of its longevity and large spatial extent. The extraordinary character of the so-called Central Chile Mega Drought (MD) was established against century long historical records and a millennial tree-ring reconstruction of regional precipitation. The largest MD-averaged rainfall relative anomalies occurred in the northern, semi-arid sector of central Chile but the event was unprecedented to the south of 35° S. ENSO neutral conditions have prevailed since 2011 (but for the strong El Niño 2015) contrasting with La Niña conditions that often accompanied past droughts. The precipitation deficit diminished the Andean snowpack and resulted in amplified declines (up to 90 %) of river flow, reservoir volumes and groundwater levels along central Chile and westernmost Argentina. In some semiarid basins we also found a conspicuous decrease in the runoff-to-rainfall coefficient. A substantial decrease in vegetation productivity occurred in the shrubland-dominated, northern sector, but a mix of greening and browning patches occurred farther south where irrigated croplands and exotic forest plantations dominate. The ongoing warming in central Chile, making the MD one of the warmest 6-year period on record, may have also contributed to such complex vegetation changes by increasing potential evapotranspiration. The understanding of the nature and biophysical impacts of the MD contributes to preparedness efforts to face a dry, warm future regional climate scenario. Reuters ISI
Cambio de Uso de Suelo2017Gómez-González, S., Paula, S., Cavieres L.A., Pausas, J.Postfire responses of the woody flora of Central Chile: insights from a germination experimentPloS One10.1371/journal.pone.0180661Fire is a selective agent shaping plant traits and community assembly in fire-prone ecosystems. However, in ecosystems with no fire history, it can be a cause of land degradation when it is suddenly introduced by humans, as plant species may not be able to respond to such novel disturbance. Unlike other Mediterranean-type ecosystems (MTE) of the world, natural fires have not been frequent during the Quaternary in the matorral of Central Chile, and thus, plant adaptive responses are expected to be uncommon. We evaluated the effect of heat shock on seed survival and germination of 21 native woody plants of the Chilean matorral and compiled information on smoke-stimulation and resprouting, to evaluate the importance of fire-adaptive responses in the context of the other MTE. We found that in the Chilean woody flora negative seed responses to fire cues were more frequent than positive responses. Although resprouting is a relatively widespread trait, fire-stimulated germination is not as common in the Chilean matorral as in other MTE. The seeds of seven endemic species were strongly damaged by fire cues and this should be considered in post-fire restoration planning. However, our results also showed that many species were resistant to elevated doses of heat shock and in some, germination was even stimulated. Thus, future research should focus on the evolutionary causes of these responses. These findings could help to develop strategies for fire management in the Chilean matorral. In addition, they will improve our understanding of the evolutionary forces that shaped this plant community and to better frame this region among the other MTE worldwide. Reuters ISIchile, endemic species, flora, germination, heat shock, human, nonhuman, plant community, smoke, woody plant, biomass, evolution, fire, forest, genetic selection, genetics, growth, development and aging, plant seed, biological evolution, fires, forests, seeds, selection, genetic
Agua y Extremos2017González, S., Garreaud, R.Spatial variability of near-surface temperature over the coastal mountains in southern Chile (38°S)Meteorology and Atmospheric PhysicsVer ficha10.1007/s00703-017-0555-4The spatial distribution of the near-surface air temperature over a coastal mountain range in southern Chile [Nahuelbuta Mountains (NM), 38°S, maximum height 1300-m ASL] is investigated using in situ measurements, satellite-derived land-surface temperature, and simulations during the austral winter of 2011. Based on a few selected but representative cases, we found that under rainy conditions—either at day or night—temperature decreases with height close to the moist adiabatic lapse rate (~6.5 °C/km). Likewise, the temperature tends to follow the dry adiabat (~9.8 °C/km) during daytime under dry- and clear-skies conditions. During clear-skies nights, the temperature also decreases with height over the southeastern side of NM, but it often increases (at about 8 °C/km) over the northwestern side of the mountains. This temperature inversion extends up to about 700-m ASL leading to an average temperature contrast of about 7 °C between the northwestern and southeastern sides of Nahuelbuta by the end of dry nights. These dawns also feature substantial temperature differences (>10 °C) among closely located stations at a same altitude. High-resolution numerical simulations suggest that upstream blocking of the prevailing SE flow, hydrostatic mountain waves, and strong downslope winds is responsible for such distinctive nocturnal temperature distribution. Reuters ISIair temperature, computer simulation, in situ measurement, mountain, spatial distribution, surface temperature, winter, chile, coastal cordillera, cordillera de nahuelbuta
Zonas Costeras2017Hamisi, Mi., Lugomela, C., Lyimo, Tj., Bergman, B., Díez, B.Plankton composition, biomass, phylogeny and toxin genes in Lake Big Momela, TanzaniaAfrican Journal of Aquatic Science10.2989/16085914.2017.1334621
Lake Big Momela, one of the East African soda lakes in Northern Tanzania characterised by highly saline-alkaline conditions, making them inhospitable to a range of organisms, although supporting massive growths of some adapted planktonic microorganisms that serve as food for birds, such as Lesser Flamingo. The temporal dynamics of plankton, with an emphasis on cyanobacteria, were examined in 2007 using morphological traits and ribosomal genetic markers (16S and 18S rRNA). Cyanobacterial genes encoding for hepatotoxins (mcyE and ndaF) were also screened. Rotifers and copepods dominated the zooplankton, whereas cyanobacteria, such as Anabaenopsis elenkinii and Arthrospira fusiformis dominated the phytoplankton community, and these being related to representatives in other East African soda lakes. The cyanobacteria community also showed distinct seasonal patterns influenced by environmental parameters, mainly salinity, pH and nitrate. Significant positive correlations were found between phytoplankton abundance and nitrate concentrations (r = 0.617, p = 0.033). No signals of the hepatotoxin synthetase genes mcyE and ndaF were retrieved from cyanobacteria during the whole year. In general, our data illustrate the presence of rich planktonic communities, including some unique and potentially endemic cyanobacteria. Reuters ISI
Cambio de Uso de Suelo2017Holz, A., Paritsis, J., Mundo, I. A., Veblen, T. T., Kitzberger, T., Williamson, G. J., Aráoz, E., Bustos-Schindler, C., González, M. E., Grau, H. R., Quezada, J. M.Southern Annular Mode drives multicentury wildfire activity in southern South AmericaProceedings of the National Academy of Sciences10.1073/pnas.1705168114The Southern Annular Mode (SAM) is the main driver of climate variability at mid to high latitudes in the Southern Hemisphere, affecting wildfire activity, which in turn pollutes the air and contributes to human health problems and mortality, and potentially provides strong feedback to the climate system through emissions and land cover changes. Here we report the largest Southern Hemisphere network of annually resolved tree ring fire histories, consisting of 1,767 fire-scarred trees from 97 sites (from 22 °S to 54 °S) in southern South America (SAS), to quantify the coupling of SAM and regional wildfire variability using recently created multicentury proxy indices of SAM for the years 1531–2010 AD. We show that at interannual time scales, as well as at multidecadal time scales across 37–54 °S, latitudinal gradient elevated wildfire activity is synchronous with positive phases of the SAM over the years 1665–1995. Positive phases of the SAM are associated primarily with warm conditions in these biomass-rich forests, in which widespread fire activity depends on fuel desiccation. Climate modeling studies indicate that greenhouse gases will force SAM into its positive phase even if stratospheric ozone returns to normal levels, so that climate conditions conducive to widespread fire activity in SAS will continue throughout the 21st century. © 2017, National Academy of Sciences. All rights reserved., climate modes, fire scars, synchrony, warming, article, biomass, climate change, fire, forest, greenhouse gas, land use, ozone layer, priority journal, south america, southern hemisphere, temperature, tree
Cambio de Uso de Suelo2017Joetzjer, E., Pillet, M., Ciais, P., Barbier, N., Chave, J., Schlund, M., Maignan, F., Barichivich, J., Luyssaert, S., Hérault, B., von Poncet, F., Poulter, B.Assimilating satellite-based canopy height within an ecosystem model to estimate aboveground forest biomassGeophysical Research Letters10.1002/2017GL074150Despite advances in Earth observation and modeling, estimating tropical biomass remains a challenge. Recent work suggests that integrating satellite measurements of canopy height within ecosystem models is a promising approach to infer biomass. We tested the feasibility of this approach to retrieve aboveground biomass (AGB) at three tropical forest sites by assimilating remotely sensed canopy height derived from a texture analysis algorithm applied to the high-resolution Pleiades imager in the Organizing Carbon and Hydrology in Dynamic Ecosystems Canopy (ORCHIDEE-CAN) ecosystem model. While mean AGB could be estimated within 10% of AGB derived from census data in average across sites, canopy height derived from Pleiades product was spatially too smooth, thus unable to accurately resolve large height (and biomass) variations within the site considered. The error budget was evaluated in details, and systematic errors related to the ORCHIDEE-CAN structure contribute as a secondary source of error and could be overcome by using improved allometric equations. Reuters ISIbiomass, large-scale ecosystem model, optical satellite imagery, radar satellite imagery, budget control, ecosystems, forestry, population statistics, systematic errors, aboveground biomass, allometric equations, earth observations, ecosystem model, radar satellites, satellite measurements, secondary sources, satellite imagery, algorithm, canopy, ecosystem modeling, feasibility study, height determination, optical method, pleiades, radar imagery, remote sensing, tropical forest
Ciudades Resilientes2017Kageyama, M., Albani, S., Braconnot, P., Harrison, S. P., Hopcroft, P. O., Ivanovic, R. F., Lambert, F., Marti, O., Peltier, W. R., Peterschmitt, J., Roche, D. M., Tarasov, L., Zhang, X., Brady, E. C., Haywood, A. M., LeGrande, A. N., Lunt, D. J., Mahowald, N. M., Mikolajewicz, U., Nisancioglu, K. H., Otto-Bliesner, B. L., Renssen, H., Tomas, R. A., Zhang, Q., Abe-Ouchi, A., Bartlein, P. J., Cao, J., Li, Q., Lohmann, G., Ohgaito, R., Shi, X., Volodin, E., Yoshida, K., Zhang, X., Zheng, W.The PMIP4 contribution to CMIP6 – Part 4: Scientific objectives and experimental design of the PMIP4-CMIP6 Last Glacial Maximum experiments and PMIP4 sensitivity experimentsGeoscientific Model Development10.5194/gmd-10-4035-2017The Last Glacial Maximum (LGM, 21 000 years ago) is one of the suite of paleoclimate simulations included in the current phase of the Coupled Model Intercomparison Project (CMIP6). It is an interval when insolation was similar to the present, but global ice volume was at a maximum, eustatic sea level was at or close to a minimum, greenhouse gas concentrations were lower, atmospheric aerosol loadings were higher than today, and vegetation and land-surface characteristics were different from today. The LGM has been a focus for the Paleoclimate Modelling Intercomparison Project (PMIP) since its inception, and thus many of the problems that might be associated with simulating such a radically different climate are well documented. The LGM state provides an ideal case study for evaluating climate model performance because the changes in forcing and temperature between the LGM and pre-industrial are of the same order of magnitude as those projected for the end of the 21st century. Thus, the CMIP6 LGM experiment could provide additional information that can be used to constrain estimates of climate sensitivity. The design of the Tier 1 LGM experiment (lgm) includes an assessment of uncertainties in boundary conditions, in particular through the use of different reconstructions of the ice sheets and of the change in dust forcing. Additional (Tier 2) sensitivity experiments have been designed to quantify feedbacks associated with land-surface changes and aerosol loadings, and to isolate the role of individual forcings. Model analysis and evaluation will capitalize on the relative abundance of paleoenvironmental observations and quantitative climate reconstructions already available for the LGM. Reuters ISIaerosol, climate modeling, cmip, experimental design, greenhouse gas, land surface, last glacial maximum, paleoclimate, reconstruction, relative abundance
Agua y Extremos2017Locatelli, B., Aldunce, P., Fallot, A., Le Coq, J. F., Sabourin, E., Tapasco, J.Research on Climate Change Policies and Rural Development in Latin America: Scope and GapsSustainability10.3390/su9101831Research on climate change policies can contribute to policy development by building an understanding of the barriers faced in policy processes, and by providing knowledge needed throughout policy cycles. This paper explores the thematic coverage of research on climate change policies related to rural areas, rural development, and natural resource management in Latin America. A three-tier framework is proposed to analyse the selected literature. The results show that research studies have focussed on the mitigation of greenhouse gas emissions from forests, and adaptations to climate change in agriculture. There is little policy research on other vulnerable sectors (e.g., water and health) and emitting sectors (e.g., energy and industry) in the context of rural development. Our analysis highlights the various research gaps that deserve increased scientific attention, including: cross-sector approaches, multi-level governance, and the stages of policy adoption, implementation and evaluation. In addition, the selected literature has a limited contribution to theoretical discussions in policy sciences. Reuters ISIadaptation, agriculture, forest, mitigation, natural resources, policy research, adaptive management, climate change, environmental policy, forest edge, greenhouse gas, natural resource, policy development, policy implementation, research work, resource management, rural area, rural development, latin america
Agua y Extremos2017Massmann, A. K., Minder, J.R., Garreaud, R. D., Kingsmill, D. E., Valenzuela, R. A., Montecinos, A., Fults, S. L., Snider, J. R.The Chilean Coastal Orographic Precipitation Experiment: Observing the Influence of Microphysical Rain Regimes on Coastal Orographic PrecipitationJournal of HydrometeorologyVer ficha10.1175/JHM-D-17-0005.1The Chilean Coastal Orographic Precipitation Experiment (CCOPE) was conducted during the austral winter of 2015 (May-August) in the Nahuelbuta Mountains (peak elevation 1.3 km MSL) of southern Chile (38°S). CCOPE used soundings, two profiling Micro Rain Radars, a Parsivel disdrometer, and a rain gauge network to characterize warm and ice-initiated rain regimes and explore their consequences for orographic precipitation. Thirty-three percent of foothill rainfall fell during warm rain periods, while 50% of rainfall fell during ice-initiated periods. Warm rain drop size distributions were characterized by many more and relatively smaller drops than ice-initiated drop size distributions. Both the portion and properties of warm and ice-initiated rainfall compare favorably with observations of coastal mountain rainfall at a similar latitude in California. Orographic enhancement is consistently strong for rain of both types, suggesting that seeding from ice aloft is not a requisite for large orographic enhancement. While the data suggest that orographic enhancement may be greater during warm rain regimes, the difference in orographic enhancement between regimes is not significant. Sounding launches indicate that differences in orographic enhancement are not easily explainable by differences in low-level moisture flux or nondimensional mountain height between the regimes. Reuters ISIcloud microphysics, coastal meteorology, drop size distribution, mountain meteorology, orographic effects, stratiform clouds, coastal zone, marine atmosphere, orographic effect, precipitation (climatology), precipitation assessment, size distribution, stratiform cloud, chile
Cambio de Uso de Suelo; Ciudades Resilientes2017McRostie, V. B., Gayo, E. M., Santoro, C. M., De Pol-Holz, R., Latorre, C.The pre-Columbian introduction and dispersal of Algarrobo (Prosopis, Section Algarobia) in the Atacama Desert of northern ChilePloS One10.1371/journal.pone.0181759Archaeological and palaeoecological studies throughout the Americas have documented widespread landscape and environmental transformation during the pre-Columbian era. The highly dynamic Formative (or Neolithic) period in northern Chile (ca. 3700–1550 yr BP) brought about the local establishment of agriculture, introduction of new crops (maize, quinoa, manioc, beans, etc.) along with a major population increase, new emergent villages and technological innovations. Even trees such as the Algarrobos (Prosopis section Algarobia) may have been part of this transformation. Here, we provide evidence that these species were not native to the Atacama Desert of Chile (18–27S), appearing only in the late Holocene and most likely due to human actions. We assembled a database composed of 41 taxon specific AMS radiocarbon dates from archaeobotanical and palaeoecological records (rodent middens, leaf litter deposits), as well an extensive bibliographical review comprising archaeobotanical, paleoecological, phylogenetic and taxonomic data to evaluate the chronology of introduction and dispersal of these trees. Although Algarrobos could have appeared as early as 4200 yr BP in northernmost Chile, they only became common throughout the Atacama over a thousand years later, during and after the Formative period. Cultural and natural factors likely contributed to its spread and consolidation as a major silvicultural resource. Reuters ISIcarbon 14, article, chile, chronology, desert, holocene, leaf litter, nonhuman, paleoecology, phylogeny, plant dispersal, prosopis, species introduction, taxonomy, agriculture, archeology, classification, crop, desert climate, genetics, history, human, physiology, archaeology, crops, agricultural, history, ancient, humans
Zonas Costeras2017Molina, A., Falvey, M., Rondanelli, R.A solar radiation database for ChileScientific Reports10.1038/s41598-017-13761-x
Chile hosts some of the sunniest places on earth, which has led to a growing solar energy industry in recent years. However, the lack of high resolution measurements of solar irradiance becomes a critical obstacle for both financing and design of solar installations. Besides the Atacama Desert, Chile displays a large array of "solar climates" due to large latitude and altitude variations, and so provides a useful testbed for the development of solar irradiance maps. Here a new public database for surface solar irradiance over Chile is presented. This database includes hourly irradiance from 2004 to 2016 at 90 m horizontal resolution over continental Chile. Our results are based on global reanalysis data to force a radiative transfer model for clear sky solar irradiance and an empirical model based on geostationary satellite data for cloudy conditions. The results have been validated using 140 surface solar irradiance stations throughout the country. Model mean percentage error in hourly time series of global horizontal irradiance is only 0.73%, considering both clear and cloudy days. The simplicity and accuracy of the model over a wide range of solar conditions provides confidence that the model can be easily generalized to other regions of the world. Reuters ISI
Cambio de Uso de Suelo2017Osborn, T. J., Barichivich, J., Harris, I., van der Schrier, G., & Jones, P. DMonitoring global drought using the self-calibrating Palmer Drought Severity Index.

State of the Climate 2016, Bulletin of the American Meteorological Society
vol.98Thomson Reuters ISI
Cambio de Uso de Suelo; Ciudades Resilientes2017Osorio, D., Steele, J., Sepúlveda, M., Gayo, E. M., Capriles, J. M., Herrera, K., Ugalde, P., De Pol-Holz, R., Latorre, C., Santoro, C. M.The Dry Puna as an ecological megapatch and the peopling of South America: Technology, mobility, and the development of a late Pleistocene/early Holocene Andean hunter-gatherer tradition in northern ChileQuaternary International10.1016/j.quaint.2017.07.010Current scientific evidence shows that humans colonized South America at least 15,000 years ago, but there are still many unknown aspects of this process, including the major and minor migratory routes involved, and the pattern of successive occupation of a diverse continental mosaic of ecosystems. In this context, the role of the Andean highlands (3400 meters above sea level) has been neglected, because of the supposedly harsh conditions for humans including hypoxia and cold climate. Nevertheless, the environmental and cultural resources available in the high Andes constitutes an important “megapatch” that should be assessed in terms of human settlement patterns. We review the evidence for late Pleistocene/early Holocene hunter-gatherer occupation of one part of this megapatch, the northern Chilean Dry Puna, in its palaeoecological context. We focus on lithic technology, faunal remains, radiocarbon dates, and other archaeological materials related to different social activities, which allow us to suggest that groups of hunter-gatherers organized and adapted their way of life to highland ecosystems through logistical mobility, and curatorial strategies for lithic tool kits that included projectile points and other formalized tools. The morphology and technological processes involved are recognized over vast territories along the high Andes. We identify this material expression as the high south central Andean Archaic hunter-gatherer tradition, which also featured long distance mobile settlement systems and communication processes over this broad and distinct megapatch. More speculatively, we outline the hypothesis that these highland ecosystems constituted a suitable migratory route that may have been key for the early peopling of the continent, and contrast it with the alternative hypothesis of the initially secondary and seasonally intermittent exploitation of this habitat by hunter-gatherers dispersing along the Pacific coastal corridor. in pressThomson Reuters ISIdry puna, early peopling of south america, high andes, late pleistocene, megapatch, south central andean archaic, archaeological evidence, fossil, human settlement, hunter-gatherer, mobility, pleistocene-holocene boundary, radiocarbon dating, technology, andes, chile, puna
Agua y Extremos, Cambio de Uso de Suelo2017Puchi, P., Muñoz, A. A., González, M. E., Abarzúa, A., Araya, K., Towner, R., Fitzek, R., Holz, A., Stahle, D.Potencial de los anillos de crecimiento de Pilgerodendron uviferum para el estudio histórico de las Iglesias de Chiloé, Patrimonio de la HumanidadBosque10.4067/S0717-92002017000100012Las iglesias de Chiloé son antiguas estructuras de madera reconocidas patrimonio de la humanidad por la UNESCO. Gran parte de su historia de construcción y reparaciones aún se desconoce. Considerando que muchas de las iglesias de Chiloé fueron construidas utilizando madera de Pilgerodendron uviferum, el objetivo de este trabajo fue evaluar el potencial de esta especie para datar piezas de madera de dos de estas históricas construcciones: las iglesias de Vilupulli e Ichuac. En Vilupulli se dataron piezas de 311 y 181 años provenientes de los pilares de la torre. Estas piezas fueron fechadas con cronologías de ancho de anillos de P. uviferum cercanas a las dos iglesias. También utilizando estas cronologías se dataron piezas de 79, 89, 97 y 135 años obtenidas a partir de los pilotes que sostienen el piso de la iglesia de Ichuac. Considerando que Vilupulli fue construida a principios del siglo XX, es posible que las muestras de la torre que presentaron fechas cercanas a 1918, sean parte del proceso tardío de construcción de la iglesia o de una restauración posterior. Por su parte, Ichuac fue construida a finales del siglo XIX, por lo que las piezas del piso que dataron entre 19201929, formarían parte de una posible restauración no descrita previamente en archivos históricos, la cual pudo ocurrir incluso varios años posterior a la fecha del anillo más reciente encontrado en las piezas estudiadas. Se concluye que P. uviferum tiene alto potencial para estudios históricos en estructuras patrimoniales en el sur de Chile. Reuters ISIdendroarchaeology, historical structures, pilgerodendron uviferum
Agua y Extremos2017Rojas-Badilla, M., Álvarez, C., Velásquez-Álvarez, G., Hadad, M., Le Quesne, C., Christie, D. A.Anomalías anatómicas en anillos de crecimiento anuales de Austrocedrus chilensis (D. Don) Pic.-Serm. et Bizzarri en el norte de su rango de distribuciónGayana. Botánica10.4067/S0717-66432017000200269Tree-ring anatomical anomalies have received little attention in southern South American trees, however they can contain valuable intra-annual environmental information. This study addressed for the first time the three most frequent tree- ring anomalies recorded in the northern and oldest known Austrocedrus chilensis forest in central Chile (32-35°S). Three anatomic anomalies described were: partially absent rings, intra-annual bands and frost rings. Partially absent rings resulted from cambial inactivity during a complete growing period and require dendrochronological tools to be detected. Intra- annual bands are consequence of the abundance-shortage of environmental resources during the growing season and can be detected by examining the undefined late-wood boundaries. Frost rings, are caused by extreme low temperatures and are characterized by collapsed cells in the tree-ring growth. Results indicate that the northern most population exhibited the highest rate of absent rings, while the occurrence of intra-annual bands seems to be rather minor in the study area. Finally, frost rings are registered mainly in the younger trees in all three studied sites. These results suggest the potential for future spatio-temporal studies that examine the frequency of these anatomical anomalies in A. chilensis chronologies along its wide geographical distribution. This will complement the current environmental information recorded by its growth rates. is.2Thomson Reuters ISI, ScieLO
Ciudades Resilientes2017Rojas, M., Lean, C. M., Morales, J., Monares, A., Fustos, R.Climate change education and literacy at the Faculty of Physical and Mathematical Sciences of the University of ChileInternational Journal of Global Warming10.1504/IJGW.2017.084785The damages related to climate change are a concerning issue for the international community, as no country will escape the impacts of climate change. Indeed, it is a preoccupation for the countries (mostly vulnerable) that will suffer those damages, but also for the States that emitted greenhouse gases which fear to have to repair them. That’s why the international negotiation related to the climate regime use the ambiguous term “loss and damage” to design the impacts related to climate change.
The purpose of this article is to know if the term “loss and damage” is a useful one in view of reparation under international law or if it is necessary to conceptualize the “climate change damage” notion employed by the doctrine. More precisely, the central question is the following: why is it necessary to conceptualize the “climate change damage” notion?
Even though “loss and damage” could formally be a legal concept, it is substantially useless with regard to reparation under international law because it is too ambiguous.
Therefore, we judged necessary to clarify the concept of “climate change damage” used by the doctrine but that unfortunately defines it insufficiently. Indeed, it could be useful for the doctrine but also for the lawyers of vulnerable countries and the judges to dispose of a legal notion in order to consider the reparation of the damages related to climate change under international law. Consequently, we propose in this article a definition of climate change damage that could be useful with regard to reparation under international law. Reuters ISI
Ciudades Resilientes; Cambio de Uso de Suelo2017Santoro, C. M., Gayo, E. M., Carter, C., Standen, V. G., Castro, V., Valenzuela, D., De Pol-Holz, R., Marquet, P. A., Latorre, C.Loco or no Loco? Holocene Climatic Fluctuations, Human Demography, and Community Based Management of Coastal Resources in Northern ChileFrontiers in Earth Science10.3389/feart.2017.00077The abundance of the southern Pacific mollusk loco (Concholepas concholepas), among other conspicuous marine supplies, are often cited as critical resources behind the long-term cultural and demographic fluctuations of prehistoric hunter-gatherers in the coastal Atacama Desert. These societies inhabited one of the world’s most productive marine environments flanked by one the world’s driest deserts. Both of these environments have witnessed significant ecological variation since people first colonized themat the end of the Pleistocene (c. 13,000 cal yr BP). Here, we examine the relationship between the relative abundance of shellfish (a staple resource) along a 9,500-year sequence of archeological shell midden accumulations at Caleta (a small inlet or cove) Vitor, with past demographic trends (established via summed probability distributions of radiocarbon ages) and technological innovations together with paleoceanographic data on past primary productivity. We find that shellfish extraction varied considerably from one cultural period to the next in terms of the number of species and their abundance, with diversity increasing during periods of regionally decreased productivity. Such shifts in consumption patterns are considered community based management decisions, and for the most part they were synchronous with large and unusual regional demographic fluctuations experienced by prehistoric coastal societies in northern Chile. When taken together with their technological innovations, our data illustrates how these human groups tailored their socio-cultural patterns to what were often abrupt and prolonged environmental changes throughout the Holocene. Reuters ISIatacama desert, cultural resources management, enso, holocene climate, marine diet, prehistoric technology
Gobernanza e Interfaz entre Ciencia y Política2017Sapiains, R., Ugarte, A. M.Contribuciones de la Psicología al abordaje de la dimensión humana del cambio climático en Chile (Primera parte)InterdisciplinariaVer fichaMúltiples estudios señalan que para abordar integralmente la problemática del cambio climático es fundamental incorporar factores psicológicos y sociales en el diseño, implementación y evaluación de estrategias de mitigación y adaptación. Estos factores resultan claves para incrementar la importancia del cambio climático en la agenda pública, favorecer un mayor involucramiento ciudadano y fortalecer la resiliencia individual, social e institucional, así como el im pacto de las políticas. No obstante, en Chile el estudio de los aspectos psicológicos del cambio climático es muy limitado.
Por su extensión este trabajo se presenta en dos partes. En esta primera parte se presenta una revisión bibliográfica que explora los principales ámbitos del cambio climático en los que la Psicología puede contribuir para comprender las complejidades del problema. Esto se organiza en cuatro grandes ejes: (1) la comunicación del cambio climático, (2) el estudio de creencias, actitudes, valores y conductas relacionadas con el problema, (3) la identificación de facilitadores y barreras psicológicas para la implementación de prácticas de mitigación y adaptación y (4) los impactos del cambio climático en la salud mental. Estos ejes constituyen un marco de referencia para el posterior desarrollo de ámbitos de acción que se apliquen específicamente al contexto chileno. is.1ScieLO
Zonas Costeras2017Shaffer, G., Fernández Villanueva, E., Rondanelli, R., Pedersen, J. O. P., Olsen, S. M., Huber, M.Implementation of methane cycling for deep time, global warming simulations with the DCESS Earth System Model (Version 1.2)
Geoscientific Model Development
10.5194/gmd-10-4081-2017Geological records reveal a number of ancient, large and rapid negative excursions of the carbon-13 isotope. Such excursions can only be explained by massive injections of depleted carbon to the Earth system over a short duration. These injections may have forced strong global warming events, sometimes accompanied by mass extinctions such as the Triassic-Jurassic and end-Permian extinctions 201 and 252 million years ago, respectively. In many cases, evidence points to methane as the dominant form of injected carbon, whether as thermogenic methane formed by magma intrusions through overlying carbon-rich sediment or from warming-induced dissociation of methane hydrate, a solid compound of methane and water found in ocean sediments. As a consequence of the ubiquity and importance of methane in major Earth events, Earth system models for addressing such events should include a comprehensive treatment of methane cycling but such a treatment has often been lacking. Here we implement methane cycling in the Danish Center for Earth System Science (DCESS) model, a simplified but well-tested Earth system model of intermediate complexity. We use a generic methane input function that allows variation in input type, size, timescale and ocean–atmosphere partition. To be able to treat such massive inputs more correctly, we extend the model to deal with ocean suboxic/anoxic conditions and with radiative forcing and methane lifetimes appropriate for high atmospheric methane concentrations. With this new model version, we carried out an extensive set of simulations for methane inputs of various sizes, timescales and ocean–atmosphere partitions to probe model behavior. We find that larger methane inputs over shorter timescales with more methane dissolving in the ocean lead to ever-increasing ocean anoxia with consequences for ocean life and global carbon cycling. Greater methane input directly to the atmosphere leads to more warming and, for example, greater carbon dioxide release from land soils. Analysis of synthetic sediment cores from the simulations provides guidelines for the interpretation of real sediment cores spanning the warming events. With this improved DCESS model version and paleo-reconstructions, we are now better armed to gauge the amounts, types, timescales and locations of methane injections driving specific, observed deep-time, global warming events. is.11Thomson Reuters ISIair-sea interaction, anoxic conditions, carbon cycle, carbon dioxide, carbon isotope, climate modeling, extinction, global warming, jurassic, marine sediment, methane, permian, radiative forcing, sediment core, simulation, suboxic conditions, terrestrial environment, triassic, denmark
Agua y Extremos; Cambio de Uso de Suelo2017Simi, E., Moreno, P. I., Villa-Martínez, R., Vilanova, I., de Pol-Holz, R.Climate change and resilience of deciduous Nothofagus forests in central-east Chilean Patagonia over the last 3200 years: RESILIENCE OF DECIDUOUS NOTHOFAGUS FORESTS IN PATAGONIAJournal of Quaternary Science10.1002/jqs.2948We examine the response of Nothofagus forests to climate change and disturbance regimes over the last 3200 years near Coyhaique (45°S), central–east Chilean Patagonia, using fine‐resolution pollen and charcoal records from lake sediment cores. Closed‐canopy deciduous Nothofagus forests have dominated the region with little variation until the arrival of Chilean–European settlers, suggesting a predominance of cool‐temperate and wet conditions. Within this state we identify centennial‐scale episodes of forest fragmentation, increase in littoral macrophytes and volcanic/paleofire disturbance between 2700 and 3000 cal a BP, 2200 and 2500 cal a BP and over the last ∼250 years, which we interpret as intervals with negative hydrologic balance. Natural variability caused little impact on the physiognomy and composition of the vegetation in pre‐European time, in contrast to the accelerated shift that started during the late 19th century associated with deforestation, homogenization and synchronization of ecosystem changes at the landscape level, and spread of exotic plant species brought by Chilean and European settlers during a warm/dry interval. The resilience of deciduous Nothofagus forests to natural disturbance regimes and climate change was exceeded by large‐scale human disturbance since the late 19th century by fire, timber exploitation and livestock grazing. These disturbances caused an ecosystem shift towards artificial meadows and scrublands with frequent high‐magnitude fires. is.6Thomson Reuters ISIhuman disturbance, nothofagus forests, paleofires, resilience, tephras, climate variation, deciduous forest, disturbance, fire history, holocene, human activity, paleoclimate, paleoenvironment, tephra, chile, patagonia, nothofagus
Zonas Costeras2017Toledo, F., Rodriguez, R., Rondanelli, R., Aguirre, R., Diaz, M.SDR Cloud Radar development with reused radio telescope componentsIEEE Geoscience and Remote Sensing10.1109/GRSS-CHILE.2017.7996016The ongoing implementation of a fog observatory in a coastal fog forest in northern Chile is expected to provide valuable information to improve our comprehension of these ecosystems alongside retrieving valuable data to fog scientists. Observing this opportunity and the increase on radio astronomy instrumental it is proposed to develop a low-cost Cloud Radar reutilizing obsolete but operative radio telescope components and software defined radios for modulation. Only preliminary tests have been conducted so far to test the viability of this approach. These tests show that it is in fact possible to build an emitter and receiver operating at 35 GHz using radio telescope components as a Radio Frequency front-end, and that the detected echo coming from the signal is affected by the presence of liquid water droplets in the air. Further development is being carried on the prototype to enable the detection of fog droplets in the boundary layer up to 2 km of height. onlineNot indexed
Ciudades Resilientes2017Véliz, K. D., Kaufmann, R. K., Cleveland, C. J., Stoner, A. M. K.The effect of climate change on electricity expenditures in MassachusettsEnergy Policy10.1016/j.enpol.2017.03.016Climate change affects consumer expenditures by altering the consumption of and price for electricity. Previous analyses focus solely on the former, which implicitly assumes that climate-induced changes in consumption do not affect price. But this assumption is untenable because a shift in demand alters quantity and price at equilibrium. Here we present the first empirical estimates for the effect of climate change on electricity prices. Translated through the merit order dispatch of existing capacity for generating electricity, climate-induced changes in daily and monthly patterns of electricity consumption cause non-linear changes in electricity prices. A 2 °C increase in global mean temperature increases the prices for and consumption of electricity in Massachusetts USA, such that the average household’s annual expenditures on electricity increase by about 12%. Commercial customers incur a 9% increase. These increases are caused largely by higher prices for electricity, whose impacts on expenditures are 1.3 and 3.6 fold larger than changes in residential and commercial consumption, respectively. This suggests that previous empirical studies understate the effects of climate change on electricity expenditures and that policy may be needed to ensure that the market generates investments in peaking capacity to satisfy climate-driven changes in summer-time consumption. Reuters ISIadaptation, climate change, electricity consumption, electricity expenditures, electricity price, costs, electric power utilization, annual expenditure, commercial customers, consumer expenditure, electricity prices, electricity-consumption, global-mean temperature, climate effect, electricity generation, electricity supply, energy use, price determination, massachusetts, united states
Ciudades Resilientes2018Urquiza, A., Amigo, C., Billi, M., Bradao, G., Morales, B.Metalogue as a transdisciplinary collaboration toolCinta moebio10.4067/S0717-554X2018000200182Contemporary society shows an increasing demand for participatory instances able to effectively foster the collaboration of diverse organizational, disciplinary and socio-cultural areas. The challenges intrinsic to such participatory instances require the development of methodologies that may allow for the insertion of reflexivity within the dialogical interaction, while also promoting the collective construction of "boundary objects": such objects, in turn, by serving as a common reference for the different perspectives involved in the dialogue, have the potential of facilitating the future collaboration among such perspectives. To respond to these demands -and inspired by the notion of metalogue originally introduced by Gregory Bateson- this paper elaborates a systemic-constructivist proposal of observation and contextual intervention, aimed at fostering reflexivity within dialogical-participatory instances by inducing their participants to perform a second-order observation of the distinctions mobilized within the interaction. Building upon this reflexivity, the metalogue pursues the co-construction of documents able to coordinate the perspectives of the participants and the expectations of the structural and organizational arrangements in which they operate. In addition to justifying and describing the technique of the metalogue, the paper highlights some lessons learned, good practices and proposals derived from its application in various transdisciplinary experiences in Chile is.16Thomson Reuters ESCIconstructivist, contextual intervention, interface, policy, reflexivity, science, transdiscipline
Zonas Costeras2018Alcamán-Arias, M.E., Pedrós-Alió, C., Tamames, J., Fernández, C., Pérez-Pantoja, D., Vásquez, M., Díez, B.Frontiers in Microbiology10.3389/fmicb.2018.02353Composition, carbon and nitrogen uptake, and gene transcription of microbial mat communities in Porcelana neutral hot spring (Northern Chilean Patagonia) were analyzed using metagenomics, metatranscriptomics and isotopically labeled carbon ((HCO3)-C-13) and nitrogen ((NH4Cl)-N-15 and (KNO3)-N-15) assimilation rates. The microbial mat community included 31 phyla, of which only Cyanobacteria and Chloroflexi were dominant. At 58 degrees C both phyla co-occurred, with similar contributions in relative abundances in metagenomes and total transcriptional activity. At 66 degrees C, filamentous anoxygenic phototrophic Chloroflexi were >90% responsible for the total transcriptional activity recovered, while Cyanobacteria contributed most metagenomics and metatranscriptomics reads at 48 degrees C. According to such reads, phototrophy was carried out both through oxygenic photosynthesis by Cyanobacteria (mostly Mastigocladus) and anoxygenic phototrophy due mainly to Chloroflexi. Inorganic carbon assimilation through the Calvin-Benson cycle was almost exclusively due to Mastigocladus, which was the main primary producer at lower temperatures. Two other CO2 fixation pathways were active at certain times and temperatures as indicated by transcripts: 3-hydroxypropionate (3-HP) bi-cycle due to Chloroflexi and 3-hydroxypropionate-4-hydroxybutyrate (HH) cycle carried out by Thaumarchaeota. The active transcription of the genes involved in these C-fixation pathways correlated with high in situ determined carbon fixation rates. In situ measurements of ammonia assimilation and nitrogen fixation (exclusively attributed to Cyanobacteria and mostly to Mastigocladus sp.) showed these were the most important nitrogen acquisition pathways at 58 and 48 degrees C. At 66 degrees C ammonia oxidation genes were actively transcribed (mostly due to Thaumarchaeota). Reads indicated that denitrification was present as a nitrogen sink at all temperatures and that dissimilatory nitrate reduction to ammonia (DNRA) contributed very little. The combination of metagenomic and metatranscriptomic analysis with in situ assimilation rates, allowed the reconstruction of day and night carbon and nitrogen assimilation pathways together with the contribution of keystone microorganisms in this natural hot spring microbial mat. Reuters ISIcarbon and nitrogen assimilation, cyanobacteria, metagenomics, metatranscriptomics, microbial mat, neutral hot spring, photosynthesis
Zonas Costeras2018Aguirre, C, García-Loyola, S, Testa, G, Silva, D, Farías, L.Insight into anthropogenic forcing on coastal upwelling off south-central ChileElem Sci Anth10.1525/elementa.314Coastal upwelling systems off the coasts of Peru and Chile are among the most productive marine ecosystems in the world, sustaining a significant percentage of global primary production and fishery yields. Seasonal and interannual variability in these systems has been relatively well documented; however, an understanding of recent trends and the influence of climate change on marine processes such as surface cooling and primary productivity is limited. This study presents evidence that winds favorable to upwelling have increased within the southern boundary of the Humboldt Current System (35°–42°S) in recent decades. This trend is consistent with a poleward movement of the influence of the Southeast Pacific Anticyclone and resembles the spatial pattern projected by Global Circulation Models for warming scenarios. Chlorophyll a levels (from 2002 to present) determined by satellite and field-based time-series observations show a positive trend, mainly in austral spring–summer (December–January–February), potentially explained by observed increments in nutrient flux towards surface waters and photosynthetically active radiation. Both parameters appear to respond to alongshore wind stress and cloud cover in the latitudinal range of 35°S to 42°S. In addition, net annual deepening of the mixed layer depth is estimated using density and temperature profiles. Changes in this depth are associated with increasing winds and may explain cooler, more saline, and more productive surface waters, with the latter potentially causing fluctuations in dissolved oxygen and other gases, such as nitrous oxide, sensitive to changes in oxygenation. We argue that these recent changes represent, at least in part, a regional manifestation of the Anthropocene along the Chilean coast. is.1Thomson Reuters ISIdecadal environmental observations and estimates, south-central chile, wind-driven coastal upwelling systems, annual variation, anthropocene, anthropogenic effect, anticyclone, climate change, cloud cover, coastal zone, cooling, dissolved oxygen, estimation method, marine ecosystem, mixed layer, oxygenation, primary production, satellite data, seasonal variation, upwelling, wind stress, chile, humboldt current, pacific ocean, pacific ocean (southeast), peru
Zonas Costeras2018Alcamán-Arias, M., Farías, L., Verdugo, J., Alarcón-Schumacher, T., Díez, B.
Microbial activity during a coastal phytoplankton bloom on the Western Antarctic Peninsula in late summerFEMS Microbiology Letters10.1093/femsle/fny090Phytoplankton biomass during the austral summer is influenced by freezing and melting cycles as well as oceanographic processes that enable nutrient redistribution in the West Antarctic Peninsula (WAP). Microbial functional capabilities, metagenomic and metatranscriptomic activities as well as inorganic 13C- and 15N-assimilation rates were studied in the surface waters of Chile Bay during two contrasting summer periods in 2014. Concentrations of Chlorophyll a (Chla) varied from 0.3 mg m−3 in February to a maximum of 2.5 mg m−3 in March, together with a decrease in nutrients; however, nutrients were never depleted. The microbial community composition remained similar throughout both sampling periods; however, microbial abundance and activity changed with Chla levels. An increased biomass of Bacillariophyta, Haptophyceae and Cryptophyceae was observed along with night-grazing activity of Dinophyceae and ciliates (Alveolates). During high Chla conditions, HCO3− uptake rates during daytime incubations increased 5-fold (>2516 nmol C L−1 d−1), and increased photosynthetic transcript numbers that were mainly associated with cryptophytes; meanwhile night time NO3− (>706 nmol N L−1 d−1) and NH4+ (41.7 nmol N L−1 d−1) uptake rates were 2- and 3-fold higher, respectively, due to activity from Alpha-/Gammaproteobacteria and Bacteroidetes (Flavobacteriia). Due to a projected acceleration in climate change in the WAP, this information is valuable for predicting the composition and functional changes in Antarctic microbial communities. is.10Thomson Reuters ISIantarctic microbial communities, bacterioplankton, c and n assimilation pathways, metatranscriptomics, phytoplankton bloom, ammonia, bicarbonate, carbon 13, chlorophyll a, nitrate, nitrogen 15, surface water, bacterial protein, sea water, algal bloom, alphaproteobacteria, antarctica, bacteroidetes, biomass, carbon fixation, coastal waters, concentration (parameters), cryptophyta, diatom, dinoflagellate, gammaproteobacteria, haptophyta, incubation time, metagenomics, microbial activity, microbial community, nitrogen fixation, nonhuman, omics, population abundance, priority journal, salinity, short survey, species composition, summer, water sampling, water temperature, bacterium, chemistry, classification, ecosystem, eukaryote, genetics, growth, development and aging, metabolism, microbiology, microflora, photosynthesis, phytoplankton, season, antarctic regions, bacteria, bacterial proteins, eukaryota, microbiota, seasons, seawater
Zonas Costeras2018Alcorta, J., Espinoza, S., Viver, T., Alcamán-Arias, M., Trefault, N., Rosselló-Móra, R., Díez, B.
Temperature modulates Fischerella thermalis ecotypes in Porcelana Hot Spring
Systematic and Applied Microbiology
In the Porcelana Hot Spring (Northern Patagonia), true-branching cyanobacteria are the dominant primary producers in microbial mats, and they are mainly responsible for carbon and nitrogen fixation. However, little is known about their metabolic and genomic adaptations at high temperatures. Therefore, in this study, a total of 81 Fischerella thermalis strains (also known as Mastigocladus laminosus) were isolated from mat samples in a thermal gradient between 61–46 °C. The complementary use of proteomic comparisons from these strains, and comparative genomics of F. thermalis pangenomes, suggested that at least two different ecotypes were present within these populations. MALDI-TOF MS analysis separated the strains into three clusters; two with strains obtained from mats within the upper temperature range (61 and 54 °C), and a third obtained from mats within the lower temperature range (51 and 46 °C). Both groups possessed different but synonymous nifH alleles. The main proteomic differences were associated with the abundance of photosynthesis-related proteins. Three F. thermalis metagenome assembled genomes (MAGs) were described from 66, 58 and 48 °C metagenomes. These pangenomes indicated a divergence of orthologous genes and a high abundance of exclusive genes at 66 °C. These results improved the current understanding of thermal adaptation of F. thermalis and the evolution of these thermophilic cyanobacterial species. Reuters ISI
Zonas Costeras2018Arriagada, L., Rojas, O., Arumí, J. L., Munizaga, J., Rojas, C., Farias, L., Vega, C.A new method to evaluate the vulnerability of watersheds facing several stressors: A case study in mediterranean ChileScience of The Total Environment10.1016/j.scitotenv.2018.09.237Freshwater systems are subjected to multiple anthropogenic stressors and natural disturbances that act as debilitating agents and modifiers of river systems, causing cumulative and synergistic effects that deteriorate their health and result in watershed vulnerability. This study proposes an easy-to-apply spatial method of watershed vulnerability evaluation using Geographic Information Systems (GIS) in the Andalién River watershed, located in the Chilean mediterranean. A watershed vulnerability index (WVI) based on three sub-indices – anthropogenic stressors, environmental fragility and natural disturbances – was developed. To determine the index grouping weights, expert surveys were carried out using the Delphi method. We subsequently normalized and integrated the factors of each sub-index with relative weights. The ranges of each thematic layer were re-classified to establish vulnerability scores. The watershed was divided into three sections: headwaters zone, transfer zone and depositional zone. The watershed vulnerability index showed that 41% of the watershed had very low vulnerability and 42% had medium vulnerability, while only 1% – in the depositional zone – had high vulnerability. A one-way ANOVA was carried out to analyze the vulnerability differences among the three sections of the watershed; it showed significant differences (F (2, 16) = 8.15: p < 0.05). The a posteriori test showed differences between the headwaters and depositional zones (Tukey test, p = 0.005) and between the transfer and depositional zones (Tukey test, p = 0.014). To validate the WVI, water quality was measured at 16 stations in the watershed; there was a significant correlation between vulnerability level and NO2 − levels (r = 0.8; p = 0.87; α = 0.05) and pH (r = 0.8; p = 0.80; α = 0.05). The WVI showed the cumulative effects of multiple stressors in the depositional zone of the watershed. This is the first study to evaluate and validate non-regulated watershed vulnerability with GIS using multiple anthropogenic and natural stressors. Reuters ISIanthropogenic stressors, environmental fragility, geographic information system, integrated management, natural disturbances, deposition, geographic information systems, information management, information systems, information use, water quality, freshwater systems, multiple stressors, natural disturbance, vulnerability evaluations, vulnerability index, watersheds, anthropogenic effect, disturbance, environmental assessment, gis, headwater, integrated approach, vulnerability, watershed, article, chile, controlled study, environmental erosion, environmental impact, landfill, priority journal, spatial analysis, thematic analysis, water analysis, water management, water pollution, water supply, andalien river, bio bio
Cambio de Uso de Suelo2018Assal,T. J., González, M. E., Sibold, J. S.Burn severity controls on postfire Araucaria-Nothofagus regeneration in the Andean CordilleraJournal of Biogeography10.1111/jbi.13428Aim: The aim of the study was to investigate postfire regeneration patterns of Araucaria-Nothofagus forests on the west slope of the Andes; to evaluate the relationship between remotely sensed burn severity and forest mortality; and to assess controls of burn severity on forest response at local spatio-temporal scales. Location: Araucanía region in the western Andean Range of south-central Chile where fire occurred during the 2001–2002 season. Methods: Sampling of prefire stand structure and postfire vegetation response was performed along a burn severity gradient a decade after the fire. We evaluated the relationship between field-measured tree mortality and satellite-derived burn severity using a generalized linear model. We fit zero-inflated mixture models to regeneration data of each genus to assess the importance of abiotic variables, stand characteristics, and biotic interactions. Results: The relative version of the delta Normalized Burn Ratio explained 85% of the variability in canopy mortality. Nearly 12,000 hectares burned; the majority at high severity (67%). Regeneration densities of both genera were lower at higher levels of burn severity and higher with greater total basal area (live, dead, and down trees). The relative effect size of burn severity on regeneration was nearly twice as large for Nothofagus, which suggests information legacies of Araucaria have cascading effects on postdisturbance material legacies. Main conclusions: Araucaria-Nothofagus mortality from wildfire can be readily mapped using satellite-derived burn severity. Although environmental site characteristics and biotic interactions mediate regeneration, basal area, and burn severity are the main mechanisms controlling regeneration. Forest refugia and postfire regeneration are vulnerable to recurrent fire. Therefore, we expect future fire (either increased severity or frequency), driven by landscape level changes, as a potential mechanism that can reduce local resilience of these forests as initial postfire material legacies (e.g., refugia and regeneration) are removed from the landscape. Our findings highlight an approach to quantify important attributes of forest disturbance and refugia, and identify areas for monitoring postdisturbance regeneration as the forests throughout south-central Chile and Argentina face a multitude of potential change agents. Reuters ISIaraucaria araucana, burn severity model, fire effects, nothofagus, regeneration model, tolhuaca national park, basal area, burning, coniferous forest, deciduous forest, environmental gradient, environmental monitoring, fire behavior, landscape ecology, mortality, regeneration, stand structure, vegetation dynamics, wildfire, andes, araucania, argentina, chile, cordillera, paraguay, araucaria, tolhuaca
Agua y Extremos2018Baez-Villanueva, O. M., Zambrano-Bigiarini, M., Ribbe, L., Nauditt, A., Giraldo-Osorio, J.D., Thinh, N.X.
Temporal and spatial evaluation of satellite rainfall estimates over different regions in Latin-America
Atmospheric Research
In developing countries, an accurate representation of the spatio-temporal variability of rainfall is currently severely limited, therefore, satellite-based rainfall estimates (SREs) are promising alternatives. In this work, six state-of-the-art SREs (TRMM 3B42v7, TRMM 3B42RT, CHIRPSv2, CMORPHv1, PERSIANN-CDR, and MSWEPv2) are evaluated over three different basins in Latin-America, using a point-to-pixel comparison at daily, monthly, and seasonal timescales. Three continuous (root mean squared error, modified Kling-Gupta efficiency, and percent bias) and three categorical (probability of detection, false alarm ratio, and frequency bias) indices are used to evaluate the performance of the different SREs, and to assess if the upscaling procedure used, in CHIRPSv2 and MSWEPv2, to enable a consistent point-to-pixel comparison affects the evaluation of the SREs performance at different time scales.

Our results show that for Paraiba do Sul in Brazil, MSWEPv2 presented the best performance at daily and monthly time scales, while CHIRPSv2 performed the best at these timescales over the Magdalena River Basin in Colombia. In the Imperial River Basin in Chile, MSWEPv2 and CHIRPSv2 performed the best at daily and monthly time scales, respectively. When the basins were evaluated at seasonal scale, CMORPHv1 performed the best for DJF and SON, TRMM 3B42v7 for MAM, and PERSIANN-CDR for JJA over Imperial Basin. MSWEPv2 performed the best over Paraiba do Sul Basin for all seasons and CHIRPSv2 showed the best performance over Magdalena Basin. The Modified Kling-Gupta efficiency (KGE′) proved to be a useful evaluation index because it decomposes the performance of the SREs into linear correlation, bias, and variability parameters, while the Root Mean Squared Error (RMSE) is not recommended for evaluating SREs performance because it gives more weight to high rainfall events and its results are not comparable between areas with different precipitation regimes.

On the other hand, CHIRPSv2 and MSWEPv2 presented different performance, for some study areas and time scales, when evaluated with their original spatial resolution (0.05° and 0.1, respectively) with respect to the evaluation resulting after applying the spatial upscaling (to a unified 0.25), showing that the upscaling procedure might impact the SRE performance. We finally conclude that a site-specific validation is needed before using any SRE, and we recommend to evaluate the SRE performance before and after applying any upscaling procedure in order to select the SRE that best represents the spatio-temporal precipitation patterns of a site. Reuters ISI
Cambio de Uso de Suelo2018Barichivich, J., Gloor, E., Peylin, P., Brienen, R. J. W., Schöngart, J., Espinoza, J. C., Pattnayak, K. C.Recent intensification of Amazon flooding extremes driven by strengthened Walker circulationScience Advances10.1126/sciadv.aat8785The Amazon basin is the largest watershed on Earth. Although the variability of the Amazon hydrological cycle has been increasing since the late 1990s, its underlying causes have remained elusive. We use water levels in the Amazon River to quantify changes in extreme events and then analyze their cause. Despite continuing research emphasis on droughts, the largest change over recent decades is a marked increase in very severe floods. Increased flooding is linked to a strengthening of the Walker circulation, resulting from strong tropical Atlantic warming and tropical Pacific cooling. Atlantic warming due to combined anthropogenic and natural factors has contributed to enhance the change in atmospheric circulation. Whether this anomalous increase in flooding will last depends on the evolution of the tropical inter-ocean temperature difference. is.9Thomson Reuters ISI-
Agua y Extremos2018Barria, P., Peel, M. C., Walsh, K. J. E., Muñoz, A.The first 300-year streamflow reconstruction of a high-elevation river in Chile using tree ringsInternational Journal of Climatology10.1002/joc.5186In central Chile, increasing demand for water and decreasing runoff volumes due to drier conditions have placed catchments in this zone under water stress. However, scarcity of observed data records increases the difficulty of planning future water supply. Instrumental records suggest a reduction in streamflow over the last 56 years. However, this change is not statistically significant and the lack of meteorological stations with long records in this mountainous region hampers a deeper analysis, motivating the use of tree rings to analyse whether these changes are part of a long-term trend. This work represents the first high-elevation runoff reconstruction in Chile using 300 years of tree ring chronologies of Araucaria araucana and Astroceudrus chilensis. The upper part of Biobío river melting season runoff (October–March) and pluvial season runoff (April–September) was reconstructed and analysed to investigate the influence of large-scale climatic drivers on runoff generation, current drought trends and to improve the understanding of climate variability in this region. We obtained positive correlations between the 20-year moving average of reconstructed pluvial season runoff and reconstructed Pacific Decadal Oscillation (PDO), which is indicative of multi-decadal variability. We also found a negative correlation between the 11-year moving average of reconstructed melting season runoff and the PDO and positive correlations with the Southern Annular Mode (SAM). Important differences in the runoff variability of the upper and the lower part of the catchment were identified which are in part led by the influence of the large-scale climatic features that drive runoff generation in both regions. We found that the changes observed in the instrumental records are part of multi-decadal cycles led by the PDO and SAM for pluvial season runoff and melting season runoff, respectively. is.1Thomson Reuters ISIhigh-elevation hydrology, multi-decadal variability, runoff reconstruction, catchments, climate change, digital storage, drought, forestry, melting, stream flow, water supply, decadal variability, high elevation, meteorological station, negative correlation, pacific decadal oscillation, positive correlations, southern annular mode, tree-ring chronologies, runoff, chronology, decadal variation, hydrology, reconstruction, river, streamflow, tree ring, chile, araucaria araucana
Ciudades Resilientes2018Benedetti, A., Reid, J. S., Knippertz, P., Marsham, J. H., Di Giuseppe, F., Rémy, S., Basart, S., Boucher, O., Brooks, I. M., Menut, L., Mona, L., Laj, P., Pappalardo, G., Wiedensohler, A., Baklanov, A., Brooks, M., Colarco, P. R., Cuevas, E., da Silva, A., Escribano, J., Flemming, J., Huneeus, N., Jorba, O., Kazadzis, S., Kinne, S., Popp, T., Quinn, P. K., Sekiyama, T. T., Tanaka, T., Terradellas, E.Status and future of numerical atmospheric aerosol prediction with a focus on data requirementsAtmospheric Chemistry and Physics10.5194/acp-18-10615-2018Numerical prediction of aerosol particle properties has become an important activity at many research and operational weather centers. This development is due to growing interest from a diverse set of stakeholders, such as air quality regulatory bodies, aviation and military authorities, solar energy plant managers, climate services providers, and health professionals. Owing to the complexity of atmospheric aerosol processes and their sensitivity to the underlying meteorological conditions, the prediction of aerosol particle concentrations and properties in the numerical weather prediction (NWP) framework faces a number of challenges. The modeling of numerous aerosol-related parameters increases computational expense. Errors in aerosol prediction concern all processes involved in the aerosol life cycle including (a) errors on the source terms (for both anthropogenic and natural emissions), (b) errors directly dependent on the meteorology (e.g., mixing, transport, scavenging by precipitation), and (c) errors related to aerosol chemistry (e.g., nucleation, gas-aerosol partitioning, chemical transformation and growth, hygroscopicity). Finally, there are fundamental uncertainties and significant processing overhead in the diverse observations used for verification and assimilation within these systems. Indeed, a significant component of aerosol forecast development consists in streamlining aerosol-related observations and reducing the most important errors through model development and data assimilation. Aerosol particle observations from satellite- and ground-based platforms have been crucial to guide model development of the recent years and have been made more readily available for model evaluation and assimilation. However, for the sustainability of the aerosol particle prediction activities around the globe, it is crucial that quality aerosol observations continue to be made available from different platforms (space, near surface, and aircraft) and freely shared. This paper reviews current requirements for aerosol observations in the context of the operational activities carried out at various global and regional centers. While some of the requirements are equally applicable to aerosol-climate, the focus here is on global operational prediction of aerosol properties such as mass concentrations and optical parameters. It is also recognized that the term "requirements" is loosely used here given the diversity in global aerosol observing systems and that utilized data are typically not from operational sources. Most operational models are based on bulk schemes that do not predict the size distribution of the aerosol particles. Others are based on a mix of "bin" and bulk schemes with limited capability of simulating the size information. However the next generation of aerosol operational models will output both mass and number density concentration to provide a more complete description of the aerosol population. A brief overview of the state of the art is provided with an introduction on the importance of aerosol prediction activities. The criteria on which the requirements for aerosol observations are based are also outlined. Assimilation and evaluation aspects are discussed from the perspective of the user requirements. is.14Thomson Reuters ISIaerosol, aerosol formation, concentration (composition), data assimilation, numerical model, particle size, prediction
Agua y Extremos; Zonas Costeras; Transversal
2018Bozkurt, D., Rondanelli, R., Marín, J. C., Garreaud, R.
Foehn Event Triggered by an Atmospheric River Underlies Record-Setting Temperature Along Continental AntarcticaJournal of Geophysical Research: Atmospheres10.1002/2017JD027796A record‐setting temperature of 17.5°C occurred on 24 March 2015 at the Esperanza station located near the northern tip of the Antarctic Peninsula (AP). We studied the event using surface station data, satellite imagery, reanalysis data, and numerical simulations. The Moderate Resolution Imaging Spectroradiometer Antarctic Ice Shelf Image Archive provides clear evidence for disintegration and advection of sea ice, as well as the formation of melt ponds on the ice sheet surface at the base of the AP mountain range. A deep low‐pressure center over the Amundsen‐Bellingshausen Sea and a blocking ridge over the southeast Pacific provided favorable conditions for the development of an atmospheric river with a northwest‐southeast orientation, directing warm and moist air toward the AP, and triggering a widespread foehn episode. A control simulation using a regional climate model shows the existence of local topographically induced warming along the northern tip of the AP (∼60% of the full temperature signal) and the central part of the eastern AP (>90% of the full temperature signal) with respect to a simulation without topography. These modeling results suggest that more than half of the warming experienced at Esperanza can be attributed to the foehn effect (a local process), rather than to the large‐scale advection of warm air from the midlatitudes. Nevertheless, the local foehn effect also has a large‐scale advection component, since the atmospheric river provides water vapor for orographic precipitation enhancement and latent heat release, which makes it difficult to completely disentangle the role of local versus large‐scale processes in explaining the extreme event. is.8Thomson Reuters ISIatmospheric river, climate variability, extreme high temperature, foehn wind, meteorology, regional climate modeling, advection, atmospheric moisture, climate change, climate modeling, extreme event, foehn, high temperature, ice shelf, modis, regional climate, temperature, amundsen sea, antarctic peninsula, antarctica, bellingshausen sea, pacific ocean, pacific ocean (southeast), southern ocean, west antarctica, esperanza
Agua y Extremos2018Büntgen, U., Wacker, L., Galván, J. D., Arnold, S., Arseneault, D., Baillie, M., Beer, J., Bernabei, M., Bleicher, N., Boswijk, G., Bräuning, A., Carrer, M., Ljungqvist, F. C., Cherubini, P., Christl, M., Christie, D. A., et al.Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CENature Communications10.1038/s41467-018-06036-0Though tree-ring chronologies are annually resolved, their dating has never been independently validated at the global scale. Moreover, it is unknown if atmospheric radiocarbon enrichment events of cosmogenic origin leave spatiotemporally consistent fingerprints. Here we measure the 14C content in 484 individual tree rings formed in the periods 770–780 and 990–1000 CE. Distinct 14C excursions starting in the boreal summer of 774 and the boreal spring of 993 ensure the precise dating of 44 tree-ring records from five continents. We also identify a meridional decline of 11-year mean atmospheric radiocarbon concentrations across both hemispheres. Corroborated by historical eye-witness accounts of red auroras, our results suggest a global exposure to strong solar proton radiation. To improve understanding of the return frequency and intensity of past cosmic events, which is particularly important for assessing the potential threat of space weather on our society, further annually resolved 14C measurements are needed. is.1Thomson Reuters ISIcarbon 14, carbon isotope, chronology, concentration (composition), cosmogenic radionuclide, solar radiation, spatiotemporal analysis, tree ring, article, atmospheric radioactivity, proton radiation, radiation measurement, radiometric dating, space, spring, summer, weather
Gobernanza e Interfaz entre Ciencia y Política2018Correa, H., Blanco-Wells, G., Barrena, J., Tacón, A.
Self-organizing processes in urban green commons. The case of the Angachilla wetland, Valdivia-ChileInternational Journal of the Commons10.18352/ijc.856This article focuses on self-organizing processes in contested urban social-ecological systems. It analyzes a wetland conservation program and civic management effort in the Angachilla sector of the city of Valdivia, Chile in a 15-year time frame. The aim is to understand what triggers collective actions and self-organization in the attempts of preserving an urban green common. The study uses a qualitative approach based on action-research methodologies. It examines key variables influencing self-organizing processes; including social-environmental crises, governance vacuums, wetland valuation, and leadership. It also discusses collective strategies for the transformation of negative feedback loops, such as norms and regulations detrimental to wetland protection, and those related to resistance to change of wetland surface area due to unregulated urbanization. From an Urban Green Commons perspective, this work illustrates the complexity of dealing with contested nature, making it a resource difficult to govern collectively given all the different interests and values in place. It also shows that there have been successful periods of active wetland management that have influenced active democratic processes regarding land use and land use change in the city. is.1Thomson Reuters ISIchile, self-organization, social-ecological systems, urban green commons, wetlands
Cambio y Uso de Suelo2018Cuevas, J. G., Arumí, J. L., Zuñiga-Feest, A., Little, C.An unusual kind of diurnal streamflow variationJournal of Hydrology and Hydromechanics10.1515/johh-2017-0041During hydrological research in a Chilean swamp forest, we noted a pattern of higher streamflows close to midday and lower ones close to midnight, the opposite of an evapotranspiration (Et)-driven cycle. We analyzed this diurnal streamflow signal (DSS), which appeared mid-spring (in the growing season). The end of this DSS coincided with a sustained rain event in autumn, which deeply affected stream and meteorological variables. A survey along the stream revealed that the DSS maximum and minimum values appeared 6 and 4 hours earlier, respectively, at headwaters located in the mountain forests/ plantations than at the control point in the swamp forest. Et in the swamp forest was higher in the morning and in the late afternoon, but this process could not influence the groundwater stage. Trees in the mountain headwaters reached their maximum Ets in the early morning and/or close to midday. Our results suggest that the DSS is a wave that moves from forests high in the mountains towards lowland areas, where Et is decoupled from the DSS. This signal delay seems to convert the link between streamflow and Et in an apparent, but spurious positive relationship. It also highlights the role of landscape heterogeneity in shaping hydrological processes. is.1Thomson Reuters ISIevapotranspiration, groundwater, riparian zones, streamflow, swamp forests, landforms, stream flow, wetlands, growing season, hydrological process, landscape heterogeneities, meteorological variables, mountain forests, streamflow variations, forestry, groundwater-surface water interaction, headwater, montane forest, riparian zone, seasonal variation, swamp forest, chile
Zonas Costeras2018Dätwyler Ch., Neukom R., Abram N., Gallant A., Grosjean M., Jacques-Coper M., Karoly D., Villalba R.
Teleconnection stationarity, variability and trends of the Southern Annular Mode (SAM) during the last millenniumClimate Dynamics10.1007/s00382-017-4015-0The Southern Annular Mode (SAM) is the leading mode of atmospheric interannual variability in the Southern Hemisphere (SH) extra-tropics. Here, we assess the stationarity of SAM spatial correlations with instrumental and paleoclimate proxy data for the past millennium. The instrumental period shows that temporal non-stationarities in SAM teleconnections are
not consistent across the SH land areas. This suggests that the influence of the SAM index is modulated by regional effects.
However, within key-regions with good proxy data coverage (South America, Tasmania, New Zealand), teleconnections are mostly stationary over the instrumental period. Using different stationarity criteria for proxy record selection, we provide
new austral summer and annual mean SAM index reconstructions over the last millennium. Our summer SAM reconstructions are very robust to changes in proxy record selection and the selection of the calibration period, particularly on the multi-decadal timescale. In contrast, the weaker performance and lower agreement in the annual mean SAM reconstructions
point towards changing teleconnection patterns that may be particularly important outside the summer months. Our results clearly portend that the temporal stationarity of the proxy-climate relationships should be taken into account in the design of comprehensive regional and hemispherical climate reconstructions. The summer SAM reconstructions show no significant relationship to solar, greenhouse gas and volcanic forcing, with the exception of an extremely strong negative anomaly following the AD 1257 Samalas eruption. Furthermore, reconstructed pre-industrial summer SAM trends are very similar to
trends obtained by model control simulations. We find that recent trends in the summer SAM lie outside the 5–95% range of pre-industrial natural variability. Reuters ISIclimate change, climate reconstruction, holocene, paleoclimate, southern hemisphere, annual variation, climate variation, reconstruction, teleconnection, trend analysis, australia, new zealand, south america, tasmania
Ciudades Resilientes2018de la Barrera, F., Barraza, F., Favier, P., Ruiz, V., Quense, J.
Megafires in Chile 2017: Monitoring multiscale environmental impacts of burned ecosystemsScience of The Total Environment10.1016/j.scitotenv.2018.05.119During the summer of 2017, several megafires in South-Central Chile burned down forest plantations, native forests, shrublands and human settlements. National authorities identified the relevant effects of the wildfires on infrastructure and ecosystems. However, other indirect effects such as the risk of flooding or, increased air pollution were not assessed. The present study assesses: i) the geographic characterization of wildfires, ii) amount of damage to ecosystems and the severity of wildfires, iii) the effects of megafires on air quality in nearby and distant urban areas, and iv) identification of cities potentially exposed to landslides and flooding. We ran remote sensing analyses based on the Normalized Burn Ratio taken from Landsat imagery, “active fires” from MODIS, and ASTER GDEM. The particulate matter (PM10 and PM2.5) levels measured on 34 Chilean's municipalities were correlated with the burning area/distance ratio by Spearman correlation. Socionatural hazards were evaluated using multi-criteria analyses combining proximity to burned areas, severity, potential flow of water and sediments as indicated by the Digital Elevation Model, drainage networks and the location of human settlements. 91 burned areas were identified, covering 529,794 ha. The most affected ecosystems were forest plantations and native shrublands. We found significant correlations between burned area/distance ratios and PM2.5 and PM10 levels, leading to increased levels over the Chilean air quality standard in the most populated cities. 37 human settlements were at increased risk of landslides and flooding hazards after fires and eleven could now be characterized as dangerously exposed. The 2017 wildfires in Chile have had an impact at both a small and large scale, with far-reaching air pollutants dispersing and affecting >74% of the Chilean population. The impact of the wildfires was also extended over time, creating future potential for landslides and flooding, with the risk increasing in rainy seasons. Reuters ISIair pollution, ecosystem services, ecosystems, impact of wildfires, risk assessment, socio-natural hazards, air quality, damage detection, fires, floods, forestry, hazards, landslides, particles (particulate matter), remote sensing, digital elevation model, multi criteria analysis, natural hazard, particulate matter, remote sensing analysis, spearman correlation, atmospheric pollution, ecosystem service, environmental impact assessment, environmental monitoring, geographical variation, wildfire, article, atmospheric dispersion, chile, city, ecosystem health, flooding, forest, hazard assessment, land drainage, landslide, particle size, priority journal, scrub, sediment, spatial analysis, urban area, water flow
Ciudades Resilientes2018del Río, C., Rivera,D., Siegmund, A., Wolf, N., Cereceda, P., Larraín, H., Lobos, F., Garcia, J. L., Osses, P., Zanetta, N., Lambert, F.ENSO Influence on Coastal Fog-Water Yield in the Atacama Desert, ChileAerosol and Air Quality Research10.4209/aaqr.2017.01.0022Fog water represents an alternative, abundant and currently unexploited fresh water resource in the coastal Atacama Desert (~20°S). Here, the stratocumulus clouds meet the Coastal Cordillera, producing highly dynamic advective marine fog, a major feature of the local climate that provides water to a hyper-arid environment. One of the main issues that arises in harvesting fog water is our limited understanding of the spatial and inter-annual variability of fog clouds and their associated water content. Here we assess the role of regional-wide El Niño Southern Oscillation (ENSO) forcing on local inter-annual fog-water yields along the coast of Atacama. We contrast 17 years of continuous fog-water data, with local and regional atmospheric and oceanographic variables to determine the link between them and the inter-annual dynamics of fog in northern Chile. Sea surface temperature (SST) in ENSO zone 1 + 2 shows significant correlations with offshore and coastal Atacama SST, as well as with local low cloud cover and fog water yields, which go beyond the annual cycle beat, exposing a potential causal link and influence of ENSO on fog along the Atacama. On the inter-annual time scale, we found that when ENSO 3 + 4 zone SST, specifically during summer, overcome a > 1°C temperature threshold, they incite significantly higher summer fog water yields and explain 79% of the fog variability. Furthermore, satellite images displaying regional extent Sc cloud and fog presence during ENSO extremes reveal higher cloud abundance during El Niño at this latitude. However, 75% of the yearly fog water is collected during winter, and does not appear to be affected in a significant manner by Pacific oscillations. Thus, our results suggest that the utilization of fog as a fresh water resource may be sustainable in the future, regardless of ENSO-induced variability in the region. is.1Thomson Reuters ISIel niño southern oscillation (enso), estación atacama uc oasis de niebla alto patache, fog-water, southeast pacific (sep), stratocumulus cloud, atmospheric pressure, climatology, clouds, fog, nickel, oceanography, scandium, surface waters, water, atacama, fog water, southern oscillation, stratocumulus clouds, water resources, annual cycle, arid environment, cloud cover, correlation, el nino-southern oscillation, satellite imagery, spatial variation, stratocumulus, sustainability, water resource, atacama desert, chile, coastal cordillera
Ciudades Resilientes2018Diaz Resquin, M., Santágata, D. , Gallardo, L., Gómez, D., Rössler, C., Dawidowski, L.D.Local and remote black carbon sources in the Metropolitan Area of Buenos AiresAtmospheric EnvironmentVer ficha10.1016/j.atmosenv.2018.03.018Equivalent black carbon () mass concentrations in the fine inhalable fraction of airborne particles () were determined using a 7-wavelength Aethalometer for 17 months, between November 2014 and March 2016, for a suburban location of the Metropolitan Area of Buenos Aires (MABA), Argentina. In addition to describing seasonal and diurnal black carbon (BC) cycles for the first time in this region, the relative contributions of fossil fuel and remote and local biomass burning were determined by distinguishing different carbonaceous components based on their effect on light attenuation for different wavelengths. Trajectory analyses and satellite-based fire products were used to illustrate the impact of long-range transport of particles emitted by non-local sources. EBC data showed a marked diurnal cycle, largely modulated by traffic variations and the height of the boundary layer, and a seasonal cycle with monthly median EBC concentrations (in ) ranging from 1.5 (February) to 3.4 (June). Maximum values were found during winter due to the combination of prevailingly stable atmospheric conditions and the increase of fossil fuel emissions, derived primarily from traffic and biomass burning from the domestic use of wood for heating. The use of charcoal grills was also detected and concentrated during weekends. The average contribution of fossil fuel combustion sources to concentrations was 96%, with the remaining 4% corresponding to local and regional biomass burning. During the entire study period, only two events were identified during which concentrations attributed to regional biomass burning accounted for over 50% of total ; these events demonstrate the relevance of agricultural and forestry activities that take place far from the city yet whose emissions can affect the urban atmosphere of the MABA. Reuters ISI
Zonas Costeras2018Farías L., Bello E., Arancibia G., Fernandez J.Distribution of dissolved methane and nitrous oxide in Chilean coastal systems of the Magellanic Sub-Antarctic region (50°–55°S)Estuarine, Coastal and Shelf Science10.1016/j.ecss.2018.10.020Nitrous oxide (N2O) and methane (CH4) are greenhouse gases and active in the depletion of the ozone layer. These gases, originating from both anthropogenic and natural sources, are mainly released to the atmosphere from coastal areas, including continental shelves, estuaries and fjords. Surface distribution of dissolved N2O and CH4 during the austral spring were described within the Magellanic Sub-Antarctic region (50–55°S, Chile) with a coastal area that has a complex system of fjords, channels, gulf and, bays. A narrow range of N2O concentrations were observed from under-saturations (∼65%), as result of freshwater/glacial flow into fjord heads, to slight super-saturations (∼120–150%) in fjord mouths and adjacent marine zones. One exception was Otway Sound, where a penguin colony is situated, with N2O levels of up to 218%. In contrast, CH4 concentrations presented a wide range of saturations between 47.9% and 483%, with a spatial distribution that mainly corresponded to the type of hydrographic/geomorphologic basin; in the southern Patagonian Andes (mostly covered by the southern Ice Fields) CH4 levels varied between 65 and 80% in the marine area, and 180% saturation in the channels and fjords; whereas in the southern Patagonian tableland (Magellan Strait) higher CH4 concentrations, up to 483% saturation, were observed apparently associated with continental inputs (peatland and tundra vegetation). N2O concentrations were positively correlated with salinity and nutrients, indicating that the majority of N2O and nutrients (except silicate) originated from the Sub-Antarctic Water Mass (SAAW), which mixes with N2O-depleated freshwater. However, CH4 concentrations did not correlate with any oceanographic variables, suggesting that they originate from local marine/terrestrial interactions. The Magellanic Sub-Antarctic region acts as a modest source of N2O and CH4, to the atmosphere with effluxes of 6.20 ± 10.13 and 16.88 ± 27.04 μmol m−2 d−1 respectively. Due to climate change and a growth in anthropogenic activities such as salmon farming, future emissions of N2O and CH4 within this remote region remain uncertain. Reuters ISIchilean fjords, magellanic sub-antarctic region, methane, nitrous oxide, coastal zone, concentration (composition), dissolved gas, fjord, freshwater, greenhouse gas, ozone depletion, saturation, spring (season), subantarctic region, andes, antarctica, australia, chile, magellan strait, otway range, patagonia, victoria australia, spheniscidae
Zonas Costeras2018Farías, L., Faúndez, J., Sanhueza-Guevara, S.Temporal dynamics of dissolved inorganic nitrogen (DIN) in the aphotic layer of a coastal upwelling system with variable dissolved oxygenJournal of Marine Systems10.1016/j.jmarsys.2018.06.001Dissolved O2 (DO) concentration is critical to determining ecosystem functions such as organic matter respiration, which can favor fixed nitrogen loss and the accumulation of compounds such as NH4+. This dynamic is observed in central Chile's coastal upwelling system (36 °S), which presents seasonally O2 deficient waters and high biological productivity. Temporal dynamics for dissolved inorganic nitrogen (DIN: NO3−, NO2− and NH4+) are analyzed based on a ten year time series of monthly measurements of DO and DIN and a three year record of absolute DIN uptake rates (ρDIN), respective turnover rates (νDIN), and O2 utilization rates (OUR). Observed O2 deficit gradually increases from hypoxia to near anoxia as the system becomes more productive, favoring the accumulation of NO2− and NH4+. Three temporal phases within the aphotic layer were distinguished: (I) DO > 62 μmol L−1 (May to August), (II) 5 < DO < 62 μmol L−1 (September to December) and (III) DO < 5 μmol L−1 (January to April). From phase I to III, DO and NO3− inventories decreased by eight and two times, respectively, while NH4+ and NO2 inventories increased two- and five-fold, respectively. Uptake rates for NH4+ varied from 0.23 to 450 nmol N L−1 d−1 and from 1.42 to 184 nmol N L−1 d−1 for NO3−. Notably, integrated ρNH4+ increased during phase III, generating a NH4+ turnover time of 12–29 days; whereas integrated ρNO3− peaked during phase II, and removed the NO3− pool over an extended turnover time (>820 days). Integrated OUR gradually increased from phase I to III (from 225 to 422 mmol m−2 d−1), with DO pools replenished over 2.3 to 26 days. NH4+ regeneration rates ranged from 34 to 62 mmol m−2 d−1 and NH4+ pools were replenished within a few days. Variation in DO, which regulates N cycling, may explain the accumulation of N-species within the aphotic layer. Observed trends could be extrapolated to scenarios of upwelling-favorable winds, eutrophication and hypoxia. Reuters ISIaphotic layer, coastal upwelling, microbial din metabolism, oxygen utilization rate, coastal engineering, dissolution, eutrophication, lakes, nitrogen, nitrogen oxides, biological productivity, dissolved inorganic nitrogens, ecosystem functions, oxygen utilization, regeneration rate, temporal dynamics, dissolved oxygen, coastal zone, dissolved inorganic nitrogen, hypoxia, nitrogen cycle, temporal variation, time series analysis, upwelling, chile
Zonas Costeras2018Fernández-Gómez, B., Díez, B., Polz, M. F., Arroyo, J. I., Alfaro, F. D., Marchandon, G., Sanhueza, C., Farías, L., Trefault, N., Marquet, P. A., Molina-Montenegro, M. A., Sylvander, P., Snoeijs-Leijonmalm, P.Bacterial community structure in a sympagic habitat expanding with global warming: brackish ice brine at 85–90 °NThe ISME Journal10.1038/s41396-018-0268-9Larger volumes of sea ice have been thawing in the Central Arctic Ocean (CAO) during the last decades than during the past 800,000 years. Brackish brine (fed by meltwater inside the ice) is an expanding sympagic habitat in summer all over the CAO. We report for the first time the structure of bacterial communities in this brine. They are composed of psychrophilic extremophiles, many of them related to phylotypes known from Arctic and Antarctic regions. Community structure displayed strong habitat segregation between brackish ice brine (IB; salinity 2.4–9.6) and immediate sub-ice seawater (SW; salinity 33.3–34.9), expressed at all taxonomic levels (class to genus), by dominant phylotypes as well as by the rare biosphere, and with specialists dominating IB and generalists SW. The dominant phylotypes in IB were related to Candidatus Aquiluna and Flavobacterium, those in SW to Balneatrix and ZD0405, and those shared between the habitats to Halomonas, Polaribacter and Shewanella. A meta-analysis for the oligotrophic CAO showed a pattern with Flavobacteriia dominating in melt ponds, Flavobacteriia and Gammaproteobacteria in solid ice cores, Flavobacteriia, Gamma- and Betaproteobacteria, and Actinobacteria in brine, and Alphaproteobacteria in SW. Based on our results, we expect that the roles of Actinobacteria and Betaproteobacteria in the CAO will increase with global warming owing to the increased production of meltwater in summer. IB contained three times more phylotypes than SW and may act as an insurance reservoir for bacterial diversity that can act as a recruitment base when environmental conditions change. Reuters ISIbacterium, brackish water, brine, community structure, dominance, environmental conditions, extremophile, generalist, global warming, meltwater, oligotrophic environment, sea ice, seawater, specialist, arctic and antarctic, arctic ocean, actinobacteria, alphaproteobacteria, bacteria (microorganisms), balneatrix, betaproteobacteria, flavobacterium, gammaproteobacteria, halomonas, polaribacter, shewanella, sea water, antarctica, arctic, classification, ecosystem, flavobacteriaceae, greenhouse effect, ice cover, isolation and purification, microbiology, salinity, season, antarctic regions, arctic regions, bacteria, seasons
Agua y Extremos2018Fernández, A., Muñoz, A., González-Reyes, A., Aguilera-Betti, I., Toledo, I., Puchi, P., Sauchyn, D., Crespo, S., Frene, C., Mundo, I., González, M., Vignola, R.Dendrohydrology and water resources management in south-central Chile: lessons from the Río Imperial streamflow reconstructionHydrology and Earth System Sciences10.5194/hess-22-2921-2018Streamflow in south-central Chile (SCC,  ∼  37–42° S) is vital for agriculture, forestry production, hydroelectricity, and human consumption. Recent drought episodes have generated hydrological deficits with damaging effects on these activities. This region is projected to undergo major reductions in water availability, concomitant with projected increases in water demand. However, the lack of long-term records hampers the development of accurate estimations of natural variability and trends. In order to provide more information on long-term streamflow variability and trends in SCC, here we report findings of an analysis of instrumental records and a tree-ring reconstruction of the summer streamflow of the Río Imperial ( ∼  37° 40′ S–38° 50′ S). This is the first reconstruction in Chile targeted at this season. Results from the instrumental streamflow record ( ∼  1940 onwards) indicated that the hydrological regime is fundamentally pluvial with a small snowmelt contribution during spring, and evidenced a decreasing trend, both for the summer and the full annual record. The reconstruction showed that streamflow below the average characterized the post-1980 period, with more frequent, but not more intense, drought episodes. We additionally found that the recent positive phase of the Southern Annular Mode has significantly influenced streamflow. These findings agree with previous studies, suggesting a robust regional signal and a shift to a new hydrological scenario. In this paper, we also discuss implications of these results for water managers and stakeholders; we provide rationale and examples that support the need for the incorporation of tree-ring reconstructions into water resources management. is.5Thomson Reuters ISIdrought, forestry, stream flow, accurate estimation, forestry production, hydrological regime, hydrological scenarios, southern annular mode, streamflow variability, tree-ring reconstruction, water resources management, water resources, climate signal, dendrochronology, paleohydrology, reconstruction, snowmelt, streamflow, water management, water resource, chile
Ciudades Resilientes2018Fernandoy, F., Tetzner, D., Meyer, H., Gacitúa, G., Hoffmann, K., Falk, E., Lambert, F., MacDonell, S.
New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies
The Cryosphere
10.5194/tc-12-1069-2018Due to recent atmospheric and oceanic warming, the Antarctic Peninsula is one of the most challenging regions of Antarctica to understand in terms of both local- and regional-scale climate signals. Steep topography and a lack of long-term and in situ meteorological observations complicate the extrapolation of existing climate models to the sub-regional scale. Therefore, new techniques must be developed to better understand processes operating in the region. Isotope signals are traditionally related mainly to atmospheric conditions, but a detailed analysis of individual components can give new insight into oceanic and atmospheric processes. This paper aims to use new isotopic records collected from snow and firn cores in conjunction with existing meteorological and oceanic datasets to determine changes at the climatic scale in the northern extent of the Antarctic Peninsula. In particular, a discernible effect of sea ice cover on local temperatures and the expression of climatic modes, especially the Southern Annular Mode (SAM), is demonstrated. In years with a large sea ice extension in winter (negative SAM anomaly), an inversion layer in the lower troposphere develops at the coastal zone. Therefore, an isotope–temperature relationship (δ–T) valid for all periods cannot be obtained, and instead the δ–T depends on the seasonal variability of oceanic conditions. Comparatively, transitional seasons (autumn and spring) have a consistent isotope–temperature gradient of +0.69 ‰ °C−1. As shown by firn core analysis, the near-surface temperature in the northern-most portion of the Antarctic Peninsula shows a decreasing trend (−0.33 °C year−1) between 2008 and 2014. In addition, the deuterium excess (dexcess) is demonstrated to be a reliable indicator of seasonal oceanic conditions, and therefore suitable to improve a firn age model based on seasonal dexcess variability. The annual accumulation rate in this region is highly variable, ranging between 1060 and 2470 kg m−2 year−1 from 2008 to 2014. The combination of isotopic and meteorological data in areas where data exist is key to reconstruct climatic conditions with a high temporal resolution in polar regions where no direct observations exist. is.3
Thomson Reuters ISIaccumulation rate, climate modeling, climate signal, data set, deuterium, ice cover, meteorology, regional climate, sea ice, stable isotope, surface temperature, topography, troposphere, warming, antarctic peninsula, antarctica, west antarctica
Ciudades Resilientes2018Flores, C., Gayo, E. M., Salazar, D., Broitman, B. R.δ 18 O of Fissurella maxima as a proxy for reconstructing Early Holocene sea surface temperatures in the coastal Atacama desert (25°S)Palaeogeography, Palaeoclimatology, Palaeoecology10.1016/j.palaeo.2018.03.031Fissurella maxima is a keyhole limpet that is abundant and well preserved in archaeological shell midden sites along the coast of Chile, making it an appropriate species to use for reconstructions of past sea surface temperature (SST). In the present study we evaluate the potential of F. maxima shells as a proxy of SST by analysing δ18O of modern shells collected alive from the Atacama desert (area of Taltal, 25°S) and archaeological shells from two Early Holocene rockshelter sites: 224A and Paposo Norte 9. Reconstructed SST from modern F. maxima shells were related to SST obtained from in situ thermometers, supporting the use of this mollusc species as a paleotemperature archive. Mean SST reconstructed from Early Holocene archaeological shells (14.13 °C) was 2.86 °C cooler than mean temperature recorded in modern shells (16.99 °C). Mean SST reconstructed from modern shells was ~1.04 °C warmer than the mean temperature of in situ thermometers (15.95°C). Hence the paleo–SST data from archaeological sites 224A and Paposo Norte 9 enrich the Early Holocene nearshore paleoceanographic scenario of the Pacific coast of South America, with mean SST cooler than present-day SST. Our results validate the use of F. maxima shells as a SST proxy and contribute to a better understanding of the latitudinal distribution of the coastal upwelling regime during the Early Holocene, temporal changes in the structure of the Humboldt Current along the Holocene, and its influence on human adaptation through the prehistory of South America. Reuters ISIfissurella maxima, oxygen stable isotope, paleotemperature calibration, shell carbonate, south–east pacific coast, temperature reconstruction, archaeological evidence, calibration, carbonate, coastal zone, gastropod, holocene, in situ measurement, midden, oxygen isotope, paleoceanography, paleotemperature, proxy climate record, reconstruction, sea surface temperature, shell, stable isotope, thermometry, atacama desert, chile, humboldt current, pacific coast chile, pacific coast south america, pacific ocean, pacific ocean (southeast), mollusca
Ciudades Resilientes2018Freeman, J., 1, Baggio, J.A., Robinson, E., Byers, D.A., Gayo, E., Finley, J.B., Meyer, J., Kelly, R.L., Anderies, J.M.Synchronization of energy consumption by human societies throughout the HoloceneProceedings of the National Academy of Sciences10.1073/pnas.1802859115We conduct a global comparison of the consumption of energy by human populations throughout the Holocene and statistically quantify coincident changes in the consumption of energy over space and time—an ecological phenomenon known as synchrony. When populations synchronize, adverse changes in ecosystems and social systems may cascade from society to society. Thus, to develop policies that favor the sustained use of resources, we must understand the processes that cause the synchrony of human populations. To date, it is not clear whether human societies display long-term synchrony or, if they do, the potential causes. Our analysis begins to fill this knowledge gap by quantifying the long-term synchrony of human societies, and we hypothesize that the synchrony of human populations results from (i) the creation of social ties that couple populations over smaller scales and (ii) much larger scale, globally convergent trajectories of cultural evolution toward more energy-consuming political economies with higher carrying capacities. Our results suggest that the process of globalization is a natural consequence of evolutionary trajectories that increase the carrying capacities of human societies. is.40Thomson Reuters ISIglobalization, human ecology, radiocarbon, sustainability, synchrony, article, bioenergy, biomass conversion, controlled study, cultural anthropology, environmental change, environmental sustainability, evolution, holocene, nonhuman, politics, population research, priority journal, social aspect, socioeconomics, archeology, ecosystem, history, human, social change, sociology, fossil fuel, archaeology, fossil fuels, history, ancient, humans, socioeconomic factors
Zonas Costeras2018Fuentes, S., Arroyo, J.I., Rodríguez-Marconi, S., Masotti, I., Alarcón-Schumacher, T., Polz, M.F., Trefault, N., de la Iglesia, R., Díez, B.Summer phyto- and bacterioplankton communities during low and high productivity scenarios in the Western Antarctic PeninsulaPolar Biology10.1007/s00300-018-2411-5Phytoplankton blooms taking place during the warm season drive high productivity in Antarctic coastal seawaters. Important temporal and spatial variations exist in productivity patterns, indicating local constraints influencing the phototrophic community. Surface water in Chile Bay (Greenwich Island, South Shetlands) is influenced by freshwater from the melting of sea ice and surrounding glaciers; however, it is not a widely studied system. The phyto- and bacterioplankton communities in Chile Bay were studied over two consecutive summers; during a low productivity period (chlorophyll a < 0.05 mg m−3) and an ascendant phototrophic bloom (chlorophyll a up to 2.38 mg m−3). Microbial communities were analyzed by 16S rRNA—including plastidial—gene sequencing. Diatoms (mainly Thalassiosirales) were the most abundant phytoplankton, particularly during the ascendant bloom. Bacterioplankton in the low productivity period was less diverse and dominated by a few operational taxonomic units (OTUs), related to Colwellia and Pseudoalteromonas. Alpha diversity was higher during the bloom, where several Bacteroidetes taxa absent in the low productivity period were present. Network analysis indicated that phytoplankton relative abundance was correlated with bacterioplankton phylogenetic diversity and the abundance of several bacterial taxa. Hubs—the most connected OTUs in the network—were not the most abundant OTUs and included some poorly described taxa in Antarctica, such as Neptunomonas and Ekhidna. In summary, the results of this study indicate that in Antarctic Peninsula coastal waters, such as Chile Bay, higher bacterioplankton community diversity occurs during a phototrophic bloom. This is likely a result of primary production, providing a source of fresh organic matter to bacterioplankton. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. Reuters ISI16s rrna gene sequencing, antarctic peninsula, bacterioplankton, phytoplankton, algal bloom, community composition, genetic analysis, organic matter, phylogenetics, relative abundance, rna, sea ice, seasonality, seawater, summer, antarctica, chilean margin, pacific ocean, west antarctica, bacillariophyta, bacteria (microorganisms), bacteroidetes, colwellia, neptunomonas, otus, pseudoalteromonas, thalassiosirales
Ciudades Resilientes; Gobernanza e Interfaz entre Ciencia y Política, Cambio de Uso de Suelo2018Gallardo, L., Barraza, F., Ceballos, A., Galleguillos, M., Huneeus, N., Lambert, F., Ibarra, C., Munizaga, M., O'Ryan, R., Osses, M.,Tolvett, S., Urquiza, A., Véliz, K.Evolution of air quality in Santiago: The role of mobility and lessons from the science-policy interfaceElementa: Science of the Anthropocene10.1525/elementa.293Worldwide, urbanization constitutes a major and growing driver of global change and a distinctive feature of the Anthropocene. Thus, urban development paths present opportunities for technological and societal transformations towards energy efficiency and decarbonization, with benefits for both greenhouse gas (GHG) and air pollution mitigation. This requires a better understanding of the intertwined dynamics of urban energy and land use, emissions, demographics, governance, and societal and biophysical processes. In this study, we address several characteristics of urbanization in Santiago (33.5°S, 70.5°W, 500 m a.s.l.), the capital city of Chile. Specifically, we focus on the multiple links between mobility and air quality, describe the evolution of these two aspects over the past 30 years, and review the role scientific knowledge has played in policy-making. We show evidence of how technological measures (e.g., fuel quality, three-way catalytic converters, diesel particle filters) have been successful in decreasing coarse mode aerosol (PM10) concentrations in Santiago despite increasing urbanization (e.g., population, motorization, urban sprawl). However, we also show that such measures will likely be insufficient if behavioral changes do not achieve an increase in the use of public transportation. Our investigation seeks to inform urban development in the Anthropocene, and our results may be useful for other developing countries, particularly in Latin America and the Caribbean where more than 80% of the population is urban. is.1Thomson Reuters ISIair quality, chile, climate mitigation, mobility, policy-science interface, urbanization, aerosol, anthropocene, atmospheric pollution, capital city, climate change, developing world, energy efficiency, global change, greenhouse gas, particulate matter, policy making, pollution control, urban development, urban population, urban sprawl, latin america
Agua y Extremos2018Garreaud, R. D.A plausible atmospheric trigger for the 2017 coastal El Niño: THE 2017 COASTAL EL NIÑOInternational Journal of ClimatologyVer ficha10.1002/joc.5426The far eastern tropical Pacific experienced a rapid, marked warming in early 2017, causing torrential rains along the west coast of South America with a significant societal toll in Peru and Ecuador. This strong coastal El Niño was largely unpredicted, even a few weeks before its onset, and it developed differently from either central or eastern events. Here we provide an overview of the event, its impacts and concomitant atmospheric circulation. It is proposed that a remotely forced, sustained weakening of the free tropospheric westerly flow impinging the subtropical Andes leads to a relaxation of the southeasterly (SE) trades off the coast, which in turn may have warmed the eastern Pacific throughout the weakening of upwelling in a near-coastal band and the lessening of the evaporative cooling farther offshore. Reuters ISIel niño, enso, flooding, peru, south america, evaporative cooling systems, oil well flooding, atmospheric circulation, eastern pacific, eastern tropical pacific, evaporative cooling, torrential rain, nickel, coastal zone, el nino, el nino-southern oscillation, troposphere, westerly, andes, ecuador, pacific ocean, pacific ocean (tropical)
Agua y Extremos2018Garreaud, R. D.
Record-breaking climate anomalies lead to severe drought and environmental disruption in western Patagonia in 2016
Climate Research
Ver ficha10.3354/cr01505Traditionally a temperate and hyper-humid region, western Patagonia experienced its most severe drought during the summer and fall of 2016. Along with precipitation deficits larger than 50% there was a similar reduction in river discharge into coastal waters, a decline in vegetation productivity, excessive solar radiation at the surface, and frequent upwelling-favorable wind events offshore. The combination of these regional-scale anomalies seems to have set the stage for environmental disturbances that, although not new in western Patagonia, occurred with unprecedented magnitude, including severe urban air pollution episodes, large forest fires, and the worst ever recorded harmful algae bloom (HAB). The local climate anomalies were in turn related to the concomitant strong El Niño (through atmospheric teleconnections) and, to a lesser extent, anthropogenic climate change mediated by the positive polarity of the Southern Annular Mode (SAM) and internal variability, as both modes weakened the westerlies. Dryer than present conditions are consistently projected for northern Patagonia during the 21st century as a consequence of anthropogenic increases in radiative forcing; superposition of El Niño events in this altered climate may result in a higher frequency of extreme droughts and environmental disruptions like those observed in 2016. is.3Thomson Reuters ISIclimate change, environment, hab, harmful algal bloom, patagonia, sam, southern annular mode
Gobernanza e Interfaz entre Ciencia y Política2018Gladkova, E., Blanco-Wells, G., Nahuelhual, L.Facing the climate change conundrum at the South Pole: actors’ perspectives on the implications of global warming for Chilean Antarctic governancePolar Research10.1080/17518369.2018.1468195Antarctica is recognized as being geopolitically and scientifically important, and as one of the regions with the greatest potential to affect and be affected by global climate change. Still, little is known in practice about how climate change will be handled within the main governance framework of the continent: the Antarctic Treaty System (ATS). Using qualitative interviews, participant observations and policy document analysis, this paper explores the perspectives of Chilean scientific, political and non-governmental actors regarding the implications of climate change for the current Antarctic governance framework. Results corroborate a misalignment of the climate change agenda and the ATS, stemming from the divergent views displayed by a wide network of actors. From the interviews, two predominant visions emerge: (i) climate change as an opportunity, where actors recognize the role of Antarctica in regulating global climate and stress greater opportunities to conduct Antarctic-based climate change research, the need for strategic international collaboration, and the reinforcement of Chile’s position in Antarctica through science; (ii) climate change as a burden where actors acknowledge climate change as a global problem, largely external to Antarctica, express disbelief regarding the effectiveness of local actions to tackle climate change and do not associate with climate change governance. The study concludes that climate change may become a dividing, rather than a unifying, field of action in Chilean Antarctic governance, reinforcing previously existing geopolitical tendencies. is.1Thomson Reuters ISIantarctic treaty system, climate governance, geopolitics, global commons, polar ecosystems, science–policy interface, antarctic treaty, climate change, global climate, global warming, governance approach, perception, antarctica, chile, east antarctica, south pole
Cambio de Uso de Suelo2018Gómez-González, S., Ojeda, F., Fernandes, P.M.Portugal and Chile: Longing for sustainable forestry while rising from the ashesEnvironmental Science & PolicyVer ficha10.1016/j.envsci.2017.11.006The recent catastrophic wildfires in Portugal and Chile shared similar features, not just because they developed under extreme weather conditions but also because extensive forest plantations were involved. Dense forest plantations of flammable pine and eucalypt species favor the development of high-intensity large fires, threatening people and the forest industry sustainability under increasingly frequent and severe drought events. Preventive land-use planning and cost-effective fuel management are key elements of sustainable forestry. Understanding the fire ecology context prior to plantation establishment is also crucial for the success of fire management planning. Although the forest industry has contributed to the economy of these countries, improved regulation and science-based management policies are strongly needed. Fuel treatment strategies can be optimized by risk-based modeling approaches, and should be mandatory in wildland-urban interfaces. The tragedy caused by these wildfires is an opportunity to change towards more sustainable landscape arrangements that reconcile ecosystem services, biodiversity conservation, and protection from life-threatening wildfires. Reuters ISI
Cambio de Uso de Suelo2018Gómez-González, S., Paniw, M., Antunes, K., Ojeda, F.Heat shock and plant leachates regulate seed germination of the endangered carnivorous plant Drosophyllum lusitanicumWeb Ecology10.5194/we-18-7-2018In fire-prone ecosystems, many plant species have specialized mechanisms of seed dormancy that ensure a successful recruitment after fire. A well-documented mechanism is the germination stimulated by fire-related cues, such as heat shock and smoke. However, less is known about the role of inhibitory germination signals (e.g. allelopathy) in regulating post-fire recruitment. Plant leachates derived from the unburned vegetation can enforce dormancy by means of allelopathic compounds, acting as a signal of unfavourable (highly
competitive) niche for germination in pyrophyte species. Here, we assessed the separate effects of heat shock and plant leachates on seed germination of Drosophyllum lusitanicum , an endangered carnivorous plant endemic to Mediterranean fire-prone heathlands. We performed a germination experiment in which seeds were subjected to three treatments: (1) 5 min at 100◦C, (2) watering with plant leachate, and (3) control. Germination rate and seed viability was determined after 63 days. Heat shock stimulated seed germination in D. lusitanicum while plant leachates had inhibitory germination effects without reducing seed viability. Thus, both positive and negative signals could be involved in its successful post-fire recruitment. Fire would break seed dormancy and stimulate seed germination of D. lusitanicum through high temperatures, but also by eliminating allelochemical compounds from the soil. These results help to understand the population dynamics patterns found for D. lusitanicum in natural populations, and highlight the role of fire in the ecology and conservation of this endangered species. Seed dormancy imposed by plant-derived leachates as an adaptive mechanism should be considered more in fire ecology theory. is.1Thomson Reuters ISIcarnivorous plant, dormancy, endangered species, germination, heat shock, leachate, population dynamics, species conservation, drosophyllum lusitanicum
Ciudades Resilientes2018Gómez, C. D., González, C. M., Osses, M., Aristizábal, B. H.Spatial and temporal disaggregation of the on-road vehicle emission inventory in a medium-sized Andean city. Comparison of GIS-based top-down methodologiesAtmospheric Environment10.1016/j.atmosenv.2018.01.049Emission data is an essential tool for understanding environmental problems associated with sources and dynamics of air pollutants in urban environments, especially those emitted from vehicular sources. There is a lack of knowledge about the estimation of air pollutant emissions and particularly its spatial and temporal distribution in South America, mainly in medium-sized cities with population less than one million inhabitants. This work performed the spatial and temporal disaggregation of the on-road vehicle emission inventory (EI) in the medium-sized Andean city of Manizales, Colombia, with a spatial resolution of 1 km × 1 km and a temporal resolution of 1 h. A reported top-down methodology, based on the analysis of traffic flow levels and road network distribution, was applied. Results obtained allowed the identification of several hotspots of emission at the downtown zone and the residential and commercial area of Manizales. Downtown exhibited the highest percentage contribution of emissions normalized by its total area, with values equal to 6% and 5% of total CO and PM10 emissions per km2 respectively. These indexes were higher than those obtained in residential-commercial area with values of 2%/km2 for both pollutants. Temporal distribution showed strong relationship with driving patterns at rush hours, as well as an important influence of passenger cars and motorcycles in emissions of CO both at downtown and residential-commercial areas, and the impact of public transport in PM10 emissions in the residential-commercial zone. Considering that detailed information about traffic counts and road network distribution is not always available in medium-sized cities, this work compares other simplified top-down methods for spatially assessing the on-road vehicle EI. Results suggested that simplified methods could underestimate the spatial allocation of downtown emissions, a zone dominated by high traffic of vehicles. The comparison between simplified methods based on total traffic counts and road density distribution suggested that the use of total traffic counts in a simplified form could enhance higher uncertainties in the spatial disaggregation of emissions. Results obtained could add new information that help to improve the air pollution management system in the city and contribute to local public policy decisions. Additionally, this work provides appropriate resolution emission fluxes for ongoing research in atmospheric modeling in the city, with the aim to improve the understanding of transport, transformation and impacts of pollutant emissions in urban air quality. Reuters ISIemission inventories, geographic information systems, medium-sized cities, on-road vehicular emissions, top-down methods, air quality, decision making, housing, information management, particles (particulate matter), pollution, roads and streets, spatial distribution, traffic control, urban transportation, vehicles, on-road vehicle emissions, public policy decisions, spatial and temporal distribution, spatial disaggregation, vehicular emission, air pollution, atmospheric modeling, comparative study, emission inventory, gis, pollutant source, public transport, spatiotemporal analysis, top-down approach, traffic emission, urban pollution, article, car driving, colombia, geographic information system, industrial area, motorcycle, particulate matter, priority journal, traffic, andes, caldas, manizales, south america
Zonas Costeras2018Guajardo-Leiva, S., Pedrós-Alió, C., Salgado, O., Pinto, F., Díez, B.Active Crossfire Between Cyanobacteria and Cyanophages in Phototrophic Mat Communities Within Hot SpringsFrontiers in Microbiology10.3389/fmicb.2018.02039Cyanophages are viruses with a wide distribution in aquatic ecosystems, that specifically infect Cyanobacteria. These viruses can be readily isolated from marine and fresh waters environments; however, their presence in cosmopolitan thermophilic phototrophic mats remains largely unknown. This study investigates the morphological diversity (TEM), taxonomic composition (metagenomics), and active infectivity (metatranscriptomics) of viral communities over a thermal gradient in hot spring phototrophic mats from Northern Patagonia (Chile). The mats were dominated (up to 53%) by cosmopolitan thermophilic filamentous true-branching cyanobacteria from the genus Mastigocladus, the associated viral community was predominantly composed of Caudovirales (70%), with most of the active infections driven by cyanophages (up to 90% of Caudovirales transcripts). Metagenomic assembly lead to the first full genome description of a T7-like Thermophilic Cyanophage recovered from a hot spring (Porcelana Hot Spring, Chile), with a temperature of 58°C (TC-CHP58). This could potentially represent a world-wide thermophilic lineage of podoviruses that infect cyanobacteria. In the hot spring, TC-CHP58 was active over a temperature gradient from 48 to 66°C, showing a high population variability represented by 1979 single nucleotide variants (SNVs). TC-CHP58 was associated to the Mastigocladus spp. by CRISPR spacers. Marked differences in metagenomic CRISPR loci number and spacers diversity, as well as SNVs, in the TC-CHP58 proto-spacers at different temperatures, reinforce the theory of co-evolution between natural virus populations and cyanobacterial hosts. Considering the importance of cyanobacteria in hot spring biogeochemical cycles, the description of this new cyanopodovirus lineage may have global implications for the functioning of these extreme ecosystems. Reuters ISIcrispr, cyanophages, hot-springs, phototrophic microbial mat, thermophilic cyanobacteria, crispr associated protein, aquatic environment, article, cyanobacterium, cyanophage, high throughput sequencing, mastigocladus, metagenomics, microbial diversity, nonhuman, phototrophy, phylogeny, rna extraction, rna sequence, single nucleotide polymorphism, thermal spring, transmission electron microscopy
Ciudades Resilientes2018Ibarra-Espinosa, S., Ynoue, R., O'ullivan, S., Pebesma, E., Andrade, M., Osses, M.VEIN v0.2.2: an R package for bottom–up vehicular emissions inventoriesGeoscientific Model Development10.5194/gmd-11-2209-2018Emission inventories are the quantification of pollutants from different sources. They provide important information not only for climate and weather studies but also for urban planning and environmental health protection. We developed an open-source model (called Vehicular Emissions Inventory-VEIN v0.2.2) that provides high-resolution vehicular emissions inventories for different fields of studies. We focused on vehicular sources at street and hourly levels due to the current lack of information about these sources, mainly in developing countries. The type of emissions covered by VEIN are exhaust (hot and cold) and evaporative considering the deterioration of the factors. VEIN also performs speciation and incorporates functions to generate and spatially allocate emissions databases. It allows users to load their own emission factors, but it also provides emission factors from the road transport model (Copert), the United States Environmental Protection Agency (EPA) and Brazilian databases. The VEIN model reads, distributes by age of use and extrapolates hourly traffic data, and it estimates emissions hourly and spatially. Based on our knowledge, VEIN is the first bottom-up vehicle emissions software that allows input to the WRF-Chem model. Therefore, the VEIN model provides an important, easy and fast way of elaborating or analyzing vehicular emissions inventories under different scenarios. The VEIN results can be used as an input for atmospheric models, health studies, air quality standardizations and decision making. Reuters ISIdeveloping world, emission inventory, environmental protection, pollutant source, road transport, traffic emission, urban planning, brazil, united states
Gobernanza e Interfaz entre Ciencia y Política2018Ibarra, C., O´Ryan, R., Silva, B.
Applying knowledge governance to understand the role of science in environmental regulation: The case of arsenic in ChileEnvironmental Science and Policy10.1016/j.envsci.2018.05.002The relationship between scientific knowledge and decision-making surrounding environmental issues is complex and represents a flourishing area of scholarship and practice. However, a sense of frustration persists regarding efforts to increase the use of science for decision-making. Regulations of copper smelter arsenic emissions developed in Chile during the 1990s represent a successful example of science informing policy making. The case involved production and use of local science in contrast to the common practice of copying international ambient standards.
In this paper, we investigate arsenic regulation in Chile in the 1990s and focus on the role of the major science intervention during the process, project FONDEF2-24. The case is examined through the lens of knowledge governance (van Kerkhoff and Pilbeam, 2017). This theoretically-oriented approach guides our critical reflection on the relationship between knowledge and policy making, taking into consideration the formal and informal rules that shape the intervention and the underlying social and cultural patterns. The success of the science intervention’s influence on policy is better understood with such a perspective.
We expand the knowledge governance approach by scrutinizing the relations of coherence between levels of analysis to assess their alignment. The approach could be helpful for studying other cases, particularly at times when a new field of policy is emerging. Reuters ISIarsenic regulation, chile, civic epistemology, emergent policy fields, knowledge governance, knowledge systems, science-policy interface, arsenic, copper, article, climate change, conceptual framework, environmental management, environmental policy, epistemology, government regulation, knowledge, mining, priority journal, rural population, social interaction, south and central america, water contamination
Cambio de Uso de Suelo2018Jimenez J.C., Barichivich J., Mattar C., Takahashi K., Santamaría-Artigas A., Sobrino J.A., Malhi Y.Spatio-temporal patterns of thermal anomalies and drought over tropical forests driven by recent extreme climatic anomaliesPhilosophical Transactions of the Royal Society B: Biological Sciences10.1098/rstb.2017.0300The recent 2015-2016 El Niño (EN) event was considered as strong as the EN in 1997-1998. Given such magnitude, it was expected to result in extreme warming and moisture anomalies in tropical areas. Here we characterize the spatial patterns of temperature anomalies and drought over tropical forests, including tropical South America (Amazonia), Africa and Asia/Indonesia during the 2015-2016 EN event. These spatial patterns of warming and drought are compared with those observed in previous strong EN events (1982-1983 and 1997-1998) and other moderate to strong EN events (e.g. 2004-2005 and 2009-2010). The link between the spatial patterns of drought and sea surface temperature anomalies in the central and eastern Pacific is also explored. We show that indeed the EN2015-2016 led to unprecedented warming compared to the other EN events over Amazonia, Africa and Indonesia, as a consequence of the background global warming trend. Anomalous accumulated extreme drought area over Amazonia was found during EN2015-2016, but this value may be closer to extreme drought area extents in the other two EN events in 1982-1983 and 1997-1998. Over Africa, datasets disagree, and it is difficult to conclude which EN event led to the highest accumulated extreme drought area. Our results show that the highest values of accumulated drought area over Africa were obtained in 2015-2016 and 1997-1998, with a long-term drying trend not observed over the other tropical regions. Over Indonesia, all datasets suggest that EN 1982-1983 and EN 1997-1998 (or even the drought of 2005) led to a higher extreme drought area than EN2015-2016. Uncertainties in precipitation datasets hinder consistent estimates of drought severity over tropical regions, and improved reanalysis products and station records are required.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'. © 2018 The Author(s). is.1760Thomson Reuters ISIdrought, el niño, scpdsi, tropical forests, warming, climate effect, drought stress, el nino, extreme event, precipitation (climatology), spatiotemporal analysis, temperature anomaly, tropical forest, tropical region, africa, amazonia, indonesia, brazil, climate change, forest, greenhouse effect, season, temperature, tropic climate, droughts, el nino-southern oscillation, forests, global warming, seasons, tropical climate
Ciudades Resilientes2018Jorquera, H., Barraza, F., Heyer, J., Valdivia, G. S., Schiappacasse, L. N., Montoya, l. D.
Indoor PM2.5 in an urban zone with heavy wood smoke pollution: The case of Temuco, ChileEnvironmental Pollution10.1016/j.envpol.2018.01.085Temuco is a mid-size city representative of severe wood smoke pollution in southern Chile; however, little is known about the indoor air quality in this region. A field measurement campaign at 63 households in the Temuco urban area was conducted in winter 2014 and is reported here. In this study, indoor and outdoor (24-hr) PM2.5 and its elemental composition were measured and compared. Infiltration parameters and outdoor/indoor contributions to indoor PM2.5 were also determined. A statistical evaluation of how various air quality interventions and household features influence indoor PM2.5 was also performed. This study determined median indoor and outdoor PM2.5 concentrations of 44.4 and 41.8 μg/m3, respectively. An average infiltration factor (0.62 ± 0.06) was estimated using sulfur as a tracer species. Using a simple mass balance approach, median indoor and outdoor contributions to indoor PM2.5 concentrations were then estimated as 12.5 and 26.5 μg/m3, respectively; therefore, 68% of indoor PM2.5 comes from outdoor infiltration. This high percentage is due to high outdoor pollution and relatively high household air exchange rates (median: 1.06 h−1). This study found that S, Br and Rb were dominated by outdoor contributions, while Si, Ca, Ti, Fe and As originated from indoor sources. Using continuous indoor and outdoor PM2.5 measurements, a median indoor source strength of 75 μg PM2.5/min was estimated for the diurnal period, similar to literature results. For the evening period, the median estimate rose to 135 μg PM2.5/min, reflecting a more intense wood burning associated to cooking and space heating at night. Statistical test results (at the 90% confidence level) support the ongoing woodstove replacement program (reducing emissions) and household weatherization subsidies (reducing heating demand) for improving indoor air quality in southern Chile, and suggest that a cookstove improvement program might be helpful as well. In the city of Temuco, southern Chile, 68% of indoor PM2.5 comes from severe outdoor pollution due to intensive wood burning, enhanced by poor household building standards and fuel poverty. Reuters ISIhousehold infiltration, indoor air quality, sustainable urban development, woodstove replacement program, building codes, heating, indoor air pollution, pollution, software testing, urban growth, wood, elemental compositions, infiltration factor, infiltration parameters, pm2.5 concentration, statistical evaluation, woodstove, air quality, arsenic, bromine, calcium, iron, rubidium, silicon, sulfur, titanium, cooking appliance, indoor air, infiltration, mass balance, particulate matter, smoke, sustainable development, urban atmosphere, adult, air quality control, air sampling, ambient air, article, chemical composition, chile, circadian rhythm, cohort analysis, combustion, concentration (parameters), controlled study, cooking, environmental exposure, household, human, night, urban area, winter, air pollutant, air pollution, analysis, city, environmental monitoring, season, statistics and numerical data, araucania, temuco, air pollutants, air pollution, indoor, cities, humans, seasons
Ciudades Resilientes2018Jorquera, H., Villalobos, A. M., Barraza, F.Ambient PM10 impacts brought by the extreme flooding event of March 24–26, 2015, in Copiapó, ChileAir Quality, Atmosphere & Health10.1007/s11869-018-0549-5On March 24-26, 2015, the Chilean city of Copiapó (27° 22′ S, 70° 20′ W), located in the hyperarid Atacama Desert, suffered an intense flooding brought by an extreme, unique rainfall event with a 35-year record of daily precipitation. A receptor model (positive matrix factorization, version 5) analysis, applied to ambient PM10 chemical speciation from three short-term sampling campaigns, resolved four sources: crustal/road dust, sea salt, secondary sulfates, and emissions from Paipote copper smelter located 8 km east of Copiapó. Wind trajectories computed with US NOAA’s Hybrid Single-Particle Lagrangian Integrated Trajectory model (HYSPLIT) supported the above source identification and explained variability in source contributions. It was found that crustal/road dust increased 50 μg/m3, in April 8-10, 2015, as compared with values in November 2014 and October-November 2015, respectively. This was the dominant PM10 source after the flooding and before debris were cleaned up, being on order of magnitude higher that the other source contributions. The Paipote copper smelter contributed with primary PM10 emissions and secondary sulfates; this combined contribution averaged 11.8 μg/m3. Sea salt contributions contributed an average of 3.3 μg/m3. In normal conditions, crustal/road dust averaged 2.9 μg/m3, but the other resolved sources also contributed with crustal elements as their emissions are transported by winds to Copiapó. The positive matrix factorization solution included an unresolved concentration of 7.4 μg/m3. The small number of samples and the lack of measurements of nitrate, ammonia, and organic and elemental carbon may explain this result. Hence, sources such as secondary nitrates and combustion sources plus fugitive dust from sources surrounding Copiapó might be included in that unresolved concentration. is.3Thomson Reuters ISIatacama desert, copper smelter, flooding event, source apportionment, suspended soil dust, sustainable urban development, ambient air, dust, extreme event, flooding, particulate matter, pollution effect, smelting, suspended particulate matter, sustainable development, urban development, atacama, chile, copiapo
Ciudades Resilientes2018Kageyama, M., Albani, S., Braconnot, P., Harrison, S. P., Haywood, A. M., Jungclaus, J. H., Otto-Bliesner, B. L., Peterschmitt, J. Y., Abe-Ouchi, A., Albani, S., Bartlein, P. J., Brierley, C., Crucifix, M., Dolan, A., Fernandez-Donado, L., Fiwher, H., Hopcroft, P. O., Hopcroft, P. O., Ivanovic, R. F., Lambert, F., Lunt, D. J., Mahowald, N. M., Peltier, W. R., Phipps, S. J., Roche, D. M., Schmidt, G. A., Tarasov, L., Valdes, P. J., Zhang, Q., Zhou, T.The PMIP4 contribution to CMIP6 – Part 1: Overview and over-arching analysis planGeoscientific Model Development10.5194/gmd-11-1033-2018This paper is the first of a series of four GMD papers on the PMIP4-CMIP6 experiments. Part 2 (Otto-Bliesner et al., 2017) gives details about the two PMIP4-CMIP6 interglacial experiments, Part 3 (Jungclaus et al., 2017) about the last millennium experiment, and Part 4 (Kageyama et al., 2017) about the Last Glacial Maximum experiment. The mid-Pliocene Warm Period experiment is part of the Pliocene Model Intercomparison Project (PlioMIP) – Phase 2, detailed in Haywood et al. (2016).

The goal of the Paleoclimate Modelling Intercomparison Project (PMIP) is to understand the response of the climate system to different climate forcings for documented climatic states very different from the present and historical climates. Through comparison with observations of the environmental impact of these climate changes, or with climate reconstructions based on physical, chemical, or biological records, PMIP also addresses the issue of how well state-of-the-art numerical models simulate climate change. Climate models are usually developed using the present and historical climates as references, but climate projections show that future climates will lie well outside these conditions. Palaeoclimates very different from these reference states therefore provide stringent tests for state-of-the-art models and a way to assess whether their sensitivity to forcings is compatible with palaeoclimatic evidence. Simulations of five different periods have been designed to address the objectives of the sixth phase of the Coupled Model Intercomparison Project (CMIP6): the millennium prior to the industrial epoch (CMIP6 name: past1000); the mid-Holocene, 6000 years ago (midHolocene); the Last Glacial Maximum, 21 000 years ago (lgm); the Last Interglacial, 127 000 years ago (lig127k); and the mid-Pliocene Warm Period, 3.2 million years ago (midPliocene-eoi400). These climatic periods are well documented by palaeoclimatic and palaeoenvironmental records, with climate and environmental changes relevant for the study and projection of future climate changes. This paper describes the motivation for the choice of these periods and the design of the numerical experiments and database requests, with a focus on their novel features compared to the experiments performed in previous phases of PMIP and CMIP. It also outlines the analysis plan that takes advantage of the comparisons of the results across periods and across CMIP6 in collaboration with other MIPs. is.3Thomson Reuters ISIclimate change, climate forcing, climate prediction, climate variation, cmip, environmental impact, holocene, last glacial maximum, last interglacial, paleoclimate, paleoenvironment, pliocene
Agua y Extremos2018León-Muñoz, J., Urbina, M. A., Garreaud, R., Iriarte, J. L.Hydroclimatic conditions trigger record harmful algal bloom in western Patagonia (summer 2016)Scientific ReportsVer ficha10.1038/s41598-018-19461-4A harmful algal bloom (HAB) of the raphidophyta alga Pseudochattonella cf. verruculosa during the 2016 austral summer (February-March) killed nearly 12% of the Chilean salmon production, causing the worst mass mortality of fish and shellfish ever recorded in the coastal waters of western Patagonia. The HAB coincided with a strong El Ninõ event and the positive phase of the Southern Annular Mode that altered the atmospheric circulation in southern South America and the adjacent Pacific Ocean. This led to very dry conditions and higher than normal solar radiation reaching the surface. Using time series of atmospheric, hydrologic and oceanographic data we show here that an increase in surface water temperature and reduced freshwater input resulted in a weakening of the vertical stratification in the fjords and sounds of this region. This allowed the advection of more saline and nutrient-rich waters, ultimately resulting in an active harmful algal bloom in coastal southern Chile. is.1Thomson Reuters ISIalgal bloom, chile, climate, growth, development and aging, microalga, harmful algal bloom, microalgae
Agua y Extremos, Gobernanza e Interfaz entre Ciencia y Política2018Lillo-Ortega, G., Aldunce, P., Adler, C., Vidal, M., Rojas, M.On the evaluation of adaptation practices: a transdisciplinary exploration of drought measures in ChileSustainability Science10.1007/s11625-018-0619-5A severe drought has affected central Chile since 2009. Various adaptation responses have been developed, and a participatory process is required to learn from them. To enable this, a transdisciplinary approach was adopted to achieve two objectives: first, to test an approach for assessing the effectiveness of existing measures to respond to drought, specifically to distil strengths and weaknesses of implementation, and developing recommendations; second, to reflect on results from a pilot project conducted to ascertain its potential for scalability in terms of processes employed. The research was organized per the three types of knowledge needed to address complex problems through transdisciplinarity: systems, target and transformation knowledge. Using the recent drought as a boundary object, we conducted the pilot in two locations in Chile where we carried out literature reviews, interviews and focus group discussions were carried out. We identified adaptation measures at national and local scale, a set of which were evaluated applying the Index for the Usefulness of Adaptation Practices (IUPA). Results indicate that through IUPA, we could systematically account for the perceived effectiveness of applied measures. Strengths such as autonomy in the decision-making process emerged as key factors that could also be applied in other contexts, whereas weaknesses such as lack of integration with other policy domains, programs or projects were identified. To address weaknesses, key recommendations were proposed, which are congruent with context-specific expectations, capacities, experiences and knowledge, given that they were articulated by local actors. Results present empirical evidence on the important utility of transdisciplinary approaches in the evaluation of adaptation measures and can support the development of metrics related to adaptation process at the local scale. Reuters ISIchile, drought, evaluation of adaptation, index for the usefulness of adaptation practices (iupa), resilience, transdisciplinarity
Agua y Extremos2018Lucas C., Puchi P., Profumo L., Ferreira A., Muñoz A.Effect of climate on tree growth in the Pampa biome of Southeastern South America: First tree-ring chronologies from UruguayDendrochronologia10.1016/j.dendro.2018.10.004Tree-ring research in the highland tropics and subtropics represents a major frontier for understanding climate-growth relationships. Nonetheless, there are many lowland regions – including the South American Pampa biome – with scarce tree ring data. We present the first two tree-ring chronologies for Scutia buxifolia in subtropical Southeastern South America (SESA), using 54 series from 29 trees in two sites in northern and southern Uruguay. We cross-dated annual rings and compared tree growth from 1950 to 2012 with regional climate variability, including rainfall, temperature and the Palmer Drought Severity Index – PDSI, the El Niño Southern Oscillation (ENSO) and the Southern Annular Mode (SAM). Overall, ring width variability was highly responsive to climate signals linked to water availability. For example, tree growth was positively correlated with accumulated rainfall in the summer-fall prior to ring formation for both chronologies. Summer climate conditions were key for tree growth, as shown by a negative effect of hot summer temperatures and a positive correlation with PDSI in late austral summer. The El Niño phase in late spring/early summer favored an increase in rainfall and annual tree growth, while the La Niña phase was associated with less rainfall and reduced tree growth. Extratropical climate factors such as SAM had an equally relevant effect on tree growth, whereby the positive phase of SAM had a negative effect over radial growth. These findings demonstrate the potential for dendroclimatic research and climate reconstruction in a region with scarce tree-ring data. They also improve the understanding of how climate variability may affect woody growth in native forests – an extremely limited ecosystem in the Pampa biome. Reuters ISIdendroclimatology, río de la plata basin, scutia buxifolia, uruguay, subtropical dendrochronology, biochronology, biome, climate change, climate conditions, climate effect, clonal growth, dendrochronology, el nino-southern oscillation, endogenous growth, growth, rainfall, reconstruction, regional climate, subtropical region, temperature effect, tree ring, woody plant, argentina, pampas, rio de la plata, south america, uruguay, scutia buxifolia
Cambio de Uso de Suelo; Ciudades Resilientes2018Mazzeo, A., Huneeus, N., Ordoñez, C., Orfanoz-Cheuquelaf, A., Menut, L., Mailler, S., Valari, M., Denier van der Gon, H., Gallardo, L., Muñoz, R., Donoso, R., Galleguillos, M., Osses, M., Tolvett, S.
Impact of residential combustion and transport emissions on air pollution in Santiago during winter
Atmospheric Environment
10.1016/j.atmosenv.2018.06.043Santiago (33.5°S, 70.5°W), the capital of Chile, is frequently affected by extreme air pollution events during wintertime deteriorating air quality (AQ) and thus affecting the health of its population. Intense residential heating and on-road transport emissions combined with poor circulation and vertical mixing are the main factors responsible for these events. A modelling system composed of a chemistry-transport model (CHIMERE) and a meteorological model (WRF) was implemented to assess the AQ impacts of residential and transportation sources in the Santiago basin. A two-week period of July 2015 with various days with poor AQ was simulated focusing on the impact on AQ with respect to fully inhalable particles (PM2.5) and nitrogen oxides (NOX). Three emission scenarios, within the range of targeted reductions of the decontamination plan of Santiago, were tested; namely 50% reduction of residential emission, 50% reduction of transport emissions and the combination of both. An additional scenario decreasing transport emissions in 10% was carried out to examine whether a linear dependence of surface concentrations on changes in emissions exists.

The system was validated against surface and vertically resolved meteorological measurements. The model reproduces the daily surface concentration variability from the AQ monitoring network of Santiago. However, the model not fully captures the emissions variations inferred from the observations which may be due to missing sources such as resuspension of dust.

Results show that, during the period studied, although both residential and transportation sources contribute to observed AQ levels in Santiago, reducing transport emissions is more effective in terms of reducing the number of days with pollution events than decreasing residential combustion. This difference in impact is largely due to the spatial distribution of the emission sources. While most of the residential combustion is emitted in the outskirts of the city, most of the transport emissions occur within the city, where most of the stations from AQ monitoring network of Santiago are located. As can be expected, the largest improvement of AQ in Santiago is achieved by the combined reduction of emissions in both sectors. Sensitivity analysis with 10% reduction in transport emissions reveals a linear behavior between emissions and concentrations for NOX and approximate linear behavior for PM2.5. The absence of secondary aerosols formation and dust resuspension in the current simulation could explain this deviation from linearity for fine particles. Nevertheless, it suggests that the results can be used for mitigation policies with emissions reductions below the 50% used in this study. Reuters ISIair quality, mitigation policies, nox, on-road emissions, pm2.5, residential emissions, combustion, dust, housing, nitrogen oxides, particles (particulate matter), roads and streets, sensitivity analysis, chemistry transport model, meteorological measurements, meteorological modeling, road transport emissions, atmospheric movements, nitrogen oxide, atmospheric modeling, atmospheric pollution, climate modeling, environmental factor, extreme event, mitigation, particulate matter, pollutant source, pollutant transport, pollution effect, pollution monitoring, pollution policy, public health, residential location, road traffic, spatial distribution, traffic emission, winter, air pollution, airborne particle, article, chile, concentration (parameters), exhaust gas, meteorology, model, particle size, priority journal, residential area, surface property, traffic and transport, metropolitana
Cambio de Uso de Suelo2018McWethy, D. B., Pauchard, A., García, R. A., Holz, A., González, M. E., Veblen, T. T., Stahl, J., Currey, B.Landscape drivers of recent fire activity (2001-2017) in south-central ChilePLOS ONE10.1371/journal.pone.0201195In recent decades large fires have affected communities throughout central and southern Chile with great social and ecological consequences. Despite this high fire activity, the controls and drivers and the spatiotemporal pattern of fires are not well understood. To identify the large-scale trends and drivers of recent fire activity across six regions in south-central Chile (~32–40 S Latitude) we evaluated MODIS satellite-derived fire detections and compared this data with Chilean Forest Service records for the period 2001–2017. MODIS burned area estimates provide a spatially and temporally comprehensive record of fire activity across an important bioclimatic transition zone between dry Mediterranean shrublands/ sclerophyllous forests and wetter deciduous-broadleaf evergreen forests. Results suggest fire activity was highly variable in any given year, with no statistically significant trend in the number of fires or mean annual area burned. Evaluation of the variables associated with spatiotemporal patterns of fire for the 2001–2017 period indicate vegetation type, biophysical conditions (e.g., elevation, slope), mean annual and seasonal climatic conditions (e.g., precipitation) and mean population density have the greatest influence on the probability of fire occurrence and burned area for any given year. Both the number of fires and annual area burned were greatest in warmer, biomass-rich lowland Bío-Bío and Araucanía regions. Resource selection analyses indicate fire ‘preferentially’ occurs in exotic plantation forests, mixed native-exotic forests, native sclerophyll forests, pasture lands and matorral, vegetation types that all provide abundant, flammable and connected biomass for burning. Structurally and compositionally homogenous exotic plantation forests may promote fire spread greater than native deciduous-Nothofagaceae forests which were once widespread in the southern parts of the study area. In the future, the coincidence of warmer and drier conditions in landscapes dominated by flammable and fuel-rich forest plantations and mixed native-exotic and sclerophyll forests are likely to further promote large fires in south-central Chile. © 2018 McWethy et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. is.8Thomson Reuters ISIchile, climate change, controlled study, ecosystem fire history, environmental change, environmental exposure, environmental impact, forest fire, geographic distribution, landscape, population density, review, seasonal variation, trend study, wildfire, biomass, ecosystem, environmental protection, fire, procedures, satellite imagery, statistics and numerical data, theoretical model, conservation of natural resources, fires, models, theoretical
Cambio de Uso de Suelo2018Miranda, A., Altamirano, A., Lara, A., Zamorano-Elgueta, C., Hernández, H. J., González, M. E., Pauchard,A., Promis, A.Monitoreo de la superficie de los bosques nativos de Chile: un desafío pendienteBosque (Valdivia)10.4067/S0717-92002018000200265Forest monitoring is important for decision making of forest management and conservation. In Chile, the forest monitoring system was initiated in 1994, which has been continued through the implementation of regional updates. This has enabled a temporal monitoring of the distribution and surface covered by native forest. However, while regional updates have reported increase in the surface covered by native forest, other studies have shown an opposite trend. Therefore, the capacity of the forest monitoring system to measure the temporal variation in forest areas was evaluated. Specifically, a review of reports and official data of the national forest monitoring system was carried out through the fulfillment of three basic criteria: i) comparability, ii) replicability and iii) quality. According to our results, the Chilean forest monitoring system does not fulfill their basic requirements because: (i) methodologies have not been consistent over time; (ii) it does not provide a baseline of land cover or forest loss that allows comparisons with changing forest area; iii) there is not adequate error estimation and how it can affect the results and analysis of monitoring. The national forest monitoring system requires a redefinition of its aims and methods, guiding them to the long term by convening different stakeholders looking for a national agreement. is.2Thomson Reuters ISIdeforestation, land cover change, land use change, national forest monitoring, redd+
Ciudades Resilientes2018Montedonico, M., Herrera-Neira, F., Marconi, A., Urquiza, A., Palma-Behnke, R.Co-construction of energy solutions: Lessons learned from experiences in ChileEnergy Research & Social Science10.1016/j.erss.2018.08.004The Energy Center has developed a co-construction methodology to address the challenges of technology transfer-based on distributed generation projects- in the context of energy transitions in isolated locations. Based on the experiences developed between 2010 and 2017, this paper analyses the process of preparing the Co-construction methodology. New tools were identified under the light of a theoretical-methodological reflection and a new version of co-construction methodology is proposed from this discussion. This learning process combines academic research and applied projects. It has provided Energy Center with an improved set of tools for current projects, and also contributed to a theoretical-methodological discussion based on new research activities. The main problems of method faced are presented during interdisciplinary work, such as: common understanding of fundamental concepts (sustainability, participation, community); the domination of one discipline over the others; the different visions of the priorities within the same project. And those problems given by the participation process under the paradox of “framing-overflowing”, where the constraints of actual projects (deadlines, budget, and specific KPIs) could limit the possibility of performing in depth diagnostics and building trust. One of the main challenges identified is that an actual impact on the overall experience is only feasible if lessons can be translated into concrete products (best practices, guidelines, tools), so can be adopted by future project developers.
Thomson Reuters ISIco-construction, interdisciplinarity, participation, sociotechnical systems
Agua y Extremos; Cambio de Uso de Suelo; Ciudades Resilientes; Gobernanza e Interfaz entre Ciencia y Política2018Moreno, P. I., Vilanova, I., Villa-Martinez, R., Dunbar, R. B., Mucciarone, D. A., Kaplan, M. R., Garreaud, R., Rojas, M., De Polz-Holz, R., Lambert, F.
Onset and Evolution of Southern Annular Mode-Like Changes at Centennial Timescale
Scientific Reports
Ver ficha10.1038/s41598-018-21836-6
The Southern Westerly Winds (SWW) are the surface expression of geostrophic winds that encircle the southern mid-latitudes. In conjunction with the Southern Ocean, they establish a coupled system that not only controls climate in the southern third of the world, but is also closely connected to the position of the Intertropical Convergence Zone and CO2 degassing from the deep ocean. Paradoxically, little is known about their behavior since the last ice age and relationships with mid-latitude glacier history and tropical climate variability. Here we present a lake sediment record from Chilean Patagonia (51°S) that reveals fluctuations of the low-level SWW at mid-latitudes, including strong westerlies during the Antarctic Cold Reversal, anomalously low intensity during the early Holocene, which was unfavorable for glacier growth, and strong SWW since ∼7.5 ka. We detect nine positive Southern Annular Mode-like events at centennial timescale since ∼5.8 ka that alternate with cold/wet intervals favorable for glacier expansions (Neoglaciations) in southern Patagonia. The correspondence of key features of mid-latitude atmospheric circulation with shifts in tropical climate since ∼10 ka suggests that coherent climatic shifts in these regions have driven climate change in vast sectors of the Southern Hemisphere at centennial and millennial timescales. is.1Thomson Reuters ISI
Agua y Extremos2018Nola, C., Overpeck, J. T., Allen, J. R. M., Anderson, P. M., Betancourt, J. L., Binney, H. A., Brewer, S., Bush, M. B., Chase, B. M., Cheddadi, R., Djamali, M., Dodson, J., Edwards, M. E., Gosling, W. D., Haberle, S., Hotchkiss, S. C., Huntley, B., Ivory, S. J., Kershaw, A. P., Kim, S. Latorre, C., Leydet, M., Lézine, A., Liu, K., Liu, Y., Lozhkin, A. V., McGlone, M. S., Marchant, R. A., Momohara, A., Moreno, P. I., Muller, S., Otto-Bliesner, B. L., Shen, C., Stevenson, J., Takahara, H., Tarasov, P. E., Tipton, J., Vincens, A., Weng, C., Xu, Q., Zheng, Z., Jackson, S.Past and future global transformation of terrestrial ecosystems under climate changeScience10.1126/science.aan5360Impacts of global climate change on terrestrial ecosystems are imperfectly constrained by ecosystem models and direct observations. Pervasive ecosystem transformations occurred in response to warming and associated climatic changes during the last glacial-to-interglacial transition, which was comparable in magnitude to warming projected for the next century under high-emission scenarios. We reviewed 594 published paleoecological records to examine compositional and structural changes in terrestrial vegetation since the last glacial period and to project the magnitudes of ecosystem transformations under alternative future emission scenarios. Our results indicate that terrestrial ecosystems are highly sensitive to temperature change and suggest that, without major reductions in greenhouse gas emissions to the atmosphere, terrestrial ecosystems worldwide are at risk of major transformation, with accompanying disruption of ecosystem services and impacts on biodiversity. is.6405Thomson Reuters ISIbiodiversity, climate change, ecosystem service, glacial-interglacial cycle, global climate, greenhouse gas, last glacial, terrestrial ecosystem, vegetation cover, article, atmosphere, carbon footprint, ecosystem
Gobernanza e Interfaz entre Ciencia y Política2018Nowajewski, P., Rojas, M., Rojo, P., Kimeswenger, S
Atmospheric dynamics and habitability range in Earth-like aquaplanets obliquity simulations
We present the evolution of the atmospheric variables that affect planetary climate by increasing the obliquity by using a general circulation model (PlaSim) coupled to a slab ocean with mixed layer flux correction.

We increase the obliquity between 30° and 90° in 16 aquaplanets with liquid sea surface and perform the simulation allowing the sea ice cover formation to be a consequence of its atmospheric dynamics.

Insolation is maintained constant in each experiment, but changing the obliquity affects the radiation budget and the large scale circulation. Earth-like atmospheric dynamics is observed for planets with obliquity under 54°. Above this value, the latitudinal temperature gradient is reversed giving place to a new regime of jet streams, affecting the shape of Hadley and Ferrel cells and changing the position of the InterTropical Convergence Zone.

As humidity and high temperatures determine Earth’s habitability, we introduce the wet bulb temperature as an atmospheric index of habitability for Earth-like aquaplanets with above freezing temperatures. The aquaplanets are habitable all year round at all latitudes for values under 54°; above this value habitability decreases toward the poles due to high temperatures. Reuters ISI
Cambio de Uso de Suelo2018Osborn, T. J., Barichivich, J., Harris, I., van der Schrier, G., & Jones, P. DGlobal Climate - d. Hydrological cycle - DroughtBulletin of the American Meteorological Society10.1175/2018BAMSStateoftheClimate.1 is.8Thomson Reuters ISI
Cambio de Uso de Suelo2018Pattnayak, K. C., Gloor, E., Tindall, J. C., Brienen, R. J. W., Barichivich, J., Baker, J. C. A., Spracklen, D. V., Cintra, B. B. L., Coelho, C. A. S.Adding new evidence to the attribution puzzle of the recent water shortage over São Paulo (Brazil)Tellus A: Dynamic Meteorology and Oceanography10.1080/16000870.2018.1481690View references (44)
São Paulo, Brazil has experienced severe water shortages and record low levels of its water reservoirs in 2013–2014. We evaluate the contributions of Amazon deforestation and climate change to low precipitation levels using a modelling approach, and address whether similar precipitation anomalies might occur more frequently in a warming world. Precipitation records from INMET show that the dry anomaly extended over a fairly large region to the north of São Paulo. Unique features of this event were anomalous sea surface temperature (SST) patterns in the Southern Atlantic, an extension of the sub tropical high into the São Paulo region and moisture flux divergence over São Paulo. The SST anomalies were very similar in 2013/14 and 2014/15, suggesting they played a major role in forcing the dry conditions. The SST anomalies consisted of three zonal bands: a cold band in the tropics, a warm band to the south of São Paulo and another cold band poleward of 40 S. We performed ensemble climate simulations with observed SSTs prescribed, vegetation cover either fixed at 1870 levels or varying over time, and greenhouse gases (GHGs) either fixed at pre-industrial levels (280 ppm CO2) or varying over time. These simulations exhibit similar precipitation deficits over the São Paulo region in 2013/14. From this, we infer that SST patterns and the associated large-scale state of the atmosphere were important factors in determining the precipitation anomalies, while deforestation and increased GHGs only weakly modulated the signal. Finally, analyses of future climate simulations from CMIP5 models indicate that the frequency of such precipitation anomalies is not likely to change in a warmer climate. © 2018, © 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. is.1Thomson Reuters ISIclimate change, deforestation, pattern recognition algorithm, sea surface temperature anomaly, water shortages, algorithm, climate effect, climate forcing, future prospect, hydrological response, pattern recognition, precipitation intensity, reservoir, resource scarcity, sea surface temperature, temperature anomaly, water supply, atlantic ocean, atlantic ocean (south), brazil, sao paulo brazil
Ciudades Resilientes; Cambio de Uso de Suelo2018Pfeiffer, M., Latorre, C., Santoro, C.M., Gayo, E.M., Rojas, R., Carrevedo, M.L., McRostie, V.B., Finstad, K., Heimsath, A., Jungers, M., Chong, G., De Pol-Holz, R., Amundson, R.Chronology, stratigraphy and hydrological modelling of extensive wetlands and paleolakes in the hyperarid core of the Atacama Desert during the late quaternaryQuaternary Science Reviews10.1016/j.quascirev.2018.08.001The halite-encrusted salt pans (salars) present at low elevations of the hyperarid core of the Atacama Desert in northern Chile are unique features of one of the driest and possibly oldest deserts on Earth. Here we show that these landscapes were shallow freshwater lakes and wetlands during the last glacial period, periodically between ~46.9 ka and 7.7 ka. The moisture appears to have been sourced from increased Andean runoff and most of our chronologies for these deposits were coeval with the Central Andean Pluvial Event (17.5-14.2 ka and 13.8-9.7 ka), but we also find evidence for older as well as slightly younger wet phases. These environments supported a diverse hygrophyte vegetation, as well as an array of diatoms, ostracods and gastropods. Using a regional hydrological model, we estimate that recharge rates from 1.5 to 4 times present were required to activate and maintain these wetlands in the past. Activation in the late Pleistocene was part of a regional enhancement of water resources, extending from the Andes, downstream and through riparian corridors, to the lowest and most arid portions of the desert itself. This fundamentally unique environment was encountered by the earliest human explorers in the region, and most likely facilitated migration and encampments on a landscape that at present lacks macroscopic life on its surface. Reuters ISIatacama desert, hyperaridity, late quaternary, paleogeography, sedimentology, south america, wetlands, arid regions, hydrology, sodium chloride, stratigraphy, water resources, arid region, aridity, chronology, gastropod, hydrological modeling, lake, paleoclimate, pleistocene, recharge, salt pan, wetland, andes, chile, bacillariophyta, gastropoda
Cambio de Uso de Suelo2018Piret, L., Bertrand, S., Kissel, C., De Pol-Holz, R., Tamayo Hernando, A., Van Daele, M.First evidence of a mid-Holocene earthquake-triggered megaturbidite south of the Chile Triple JunctionSedimentary Geology10.1016/j.sedgeo.2018.01.002Megaturbidites have been the focus of many paleoseismic and paleoenvironmental studies because they can provide evidence for catastrophic and/or hazardous events with potentially major environmental implications. During a recent research cruise in Baker Fjord, Chile (47°54'S-74°30'W), a megaturbidite was described between the Northern and Southern Patagonian Icefields. Here, we aim to determine the depositional processes of the megaturbidite and identify its origin. Based on the turbidite's location, a possible origin was the early Holocene drainage of paleo-lake General Carrera, which was recently proposed in the literature as having produced a Glacial Lake Outburst Flood (GLOF) that drained through Baker Fjord. Due to the fjord's location in a subduction zone, and close to the Chile Triple Junction, however, seismic activity must also be considered as a potential triggering mechanism. To achieve our goals, we undertook a multi-proxy analysis of sediment core MD07-3121, including sedimentology (grain size, loss-on-ignition, foraminifera counts), magnetic properties, bulk organic geochemistry, and radiocarbon dating, and we analysed bathymetric maps and sub-bottom profiles. Our grain-size results display a diagnostic fining upward trend and show evidence of seiching in the 733-cm-thick megaturbidite. The age of the event (5513-5211 cal yr BP) contradicts the hypothesis of an early Holocene GLOF origin. Bulk organic geochemical results indicate that the sediments that compose the turbidite are clearly of marine origin, which further goes against a GLOF origin. In addition, the megaturbidite is underlain by a 1136 cm thick mass transport deposit (MTD), also composed of marine sediments. According to the sub-bottom profiles, the MTD and the megaturbidite originate from the reworking of thick packages of sediment previously deposited on nearby sills and on the fjord's flanks. Furthermore, similar coeval deposits are found in an adjacent sub-basin. We therefore interpret these deposits to be triggered by an earthquake during the late mid-Holocene. While megathrust and intraslab earthquakes are possible in the region, we argue that a crustal earthquake is the most likely seismic trigger in the study area. This study reveals the first earthquake-triggered megaturbidite south of the Chile Triple Junction. Reuters ISIearthquake, holocene, patagonia, sediment provenance, turbidite, bathymetry, deposits, geochemistry, grain size and shape, lakes, maps, sediments, submarine geology, chile triple junctions, environmental implications, glacial lake outburst flood, holocenes, paleoenvironmental study, earthquakes, deposition, earthquake trigger, fjord, paleoenvironment, paleoseismicity, provenance, subduction zone, chile, chile triple junction, pacific ocean, foraminifera
Cambio de Uso de Suelo2018Rozas, V., Le Quesne, C., Rojas-Badilla, M., González, M., González-Reyes, A.Coupled human-climate signals on the fire history of upper Cachapoal Valley, Mediterranean Andes of Chile, since 1201 CEGlobal and Planetary Change10.1016/j.gloplacha.2018.05.013The long-term history of fire regimes in the Mediterranean Andes of Chile is almost unknown. Subalpine woodlands of Austrocedrus chilensis include long-lived trees resilient to low-intensity fires, which can provide valuable tree-ring-based information about fire history. In this work, we performed an annually resolved multicentury reconstruction of past fires from fire-scar records identified in relict Austrocedrus wood found on steep highly-eroded and rocky slopes with coarser fuel structure in the upper Cachapoal Valley, central Andes of Chile. We compared this fire record with historical land-use changes and extensive reconstructions of regional precipitation and temperature, as well as large-scale climatic patterns. The highest fire frequencies were recorded in the Spanish settlement period (1541–1750), when land-clearing activities, cattle ranching, agriculture, and mining practices became widespread after the Spanish conquest. At an interannual time scale, fire occurrence and precipitation were unconnected during the Spanish settlement. By contrast, in the indigenous period (1200–1540), under the influence of the aboriginal Chiquillanes people, fires occurred in wet years with high vegetation productivity. In the livestock grazing period (1751–1950), when large cattle ranches were established, fires occurred in dry years after a wet year. Fires in this period were likely ignited under conditions of high fuel flammability to improve plant production and promote intensive livestock grazing. At a multidecadal time scale, fires were more frequent in cold periods throughout the whole record. These findings suggest that herbaceous fuel accumulation and flammability, modulated by climate variation and human land uses, were the main factors promoting fires spread in this Mediterranean subalpine area. Our research emphasizes the importance of relict Austrocedrus wood for fire history reconstruction and expands knowledge about fire regime shifts over the past eight centuries in southern South America. Reuters ISIaustrocedrus chilensis, climate drivers, dendrochronology, fire regime, land use history, forestry, fuels, land use, plants (botany), fire regimes, interannual time scale, multi-decadal time scale, southern south america, vegetation productivity, fires, climate variation, coniferous tree, environmental factor, fire history, indigenous population, land use change, nature-society relations, precipitation (climatology), subalpine environment, temperature effect, wood, woodland, andes, chile, mediterranean region, spain, austrocedrus, bos
Ciudades Resilientes2018Santoro, C.M., Castro, V., Capriles, J.M., Barraza, J., Correa, J., Marquet, P.A., McRostie, V., Gayo, E.M., Latorre, C., Valenzuela, D., Uribe, M., de Porras, M.E., Standen, V.G., Angelo, D., Maldonado, A., Hamame, E., Jofre, D.Acta de Tarapacá: "Pueblo sin Agua, Pueblo Muerto"
Chungará (Arica)
10.4067/S0717-73562018000200169“The Tarapacá Declaration” draws attention to the urgent need to change how human societies have been using water in the Atacama Desert, based on a historical trajectory spanning several millennia. The Declaration, an initiative that summarizes the results of the CONICYT/PIA, Anillo project SOC1405, is oriented towards civil society and various political entities, aiming to generate technological and cultural changes to halt and mitigate the effects caused by anthropogenic activities in one of the oldest and most arid deserts in the world. In the course of the project, we established the urgent need to sensitize society to the wasteful overuse and misuse of water in the Atacama Desert, a non-renewable resource in relation to the economic scales of extraction of this element that depends, fundamentally, on fossil waters that have accumulated for millennia in the highlands of the Desert. In this way we want to avoid that this scientific knowledge is encapsulated in the universities and to echo the point made by Victoria Castro (2003): that to grow you have to educate. is.2Thomson Reuters ISI-
Zonas Costeras2018Sepulveda-Jauregui, A., Martinez-Cruz, K., Lau, M., Casper, P.Assessment of methane and carbon dioxide emissions in two sub-basins of a small acidic bog lake artificially divided 30 years agoFreshwater Biology10.1111/fwb.13182Although lakes are important sources of methane (CH4) and carbon dioxide (CO2) to the atmosphere contributing to global warming, their CH4 and CO2 emissions are rarely assessed. In particular, increasing inputs of terrestrial dissolved organic carbon (DOC) may affect gas dynamics and alter seasonal changes in gas production. Here, we analysed variations in CH4 and CO2 dynamics in sub-basins of an acidic bog lake, which was artificially divided into four quarters three decades ago, leading to divergence in water chemistry and biology. In the divided lake, only the south-west basin (SW) received DOC inputs from an adjacent peat bog, while the north-east basin (NE) was hydrologically disconnected. A year-long determination of CH4 and CO2 production and emission patterns in the two contrasting basins exposed the indirect mechanisms by which DOC supply exercised control on greenhouse gas dynamics in this shallow lake. In both basins, dissolved CH4 was negatively correlated with dissolved oxygen (O2) through the water column, suggesting that aerobic methanotrophy is an important regulator of CH4 emissions in this lake. In contrast, the amount of CO2 stored in oxic and anoxic layers was not significantly different between the basins, suggesting that O2 is not the most important driver of dissolved CO2. Estimated total CH4 and CO2 emissions were 2.1 and 1.7 times lower in the NE basin than in the SW basin, with major CH4 and CO2 emissions occurring during the fall turnover. The differences in CH4 and CO2 emissions suggest that the hydro-physical properties, namely seasonal temperature, the duration of stratification and O2 availability, are the main drivers of CH4 and CO2 emissions to the atmosphere from small shallow lakes under the influence of DOC inputs under global warming pressure. Reuters ISIcarbon storage, dissolved greenhouse gases, humic substances, limnology, year-round experiment
Ciudades Resilientes2018Shaffer, G., Lambert, F.
In and out of glacial extremes by way of dust−climate feedbacks
Proceedings of the National Academy of Sciences
Mineral dust aerosols cool Earth directly by scattering incoming solar radiation and indirectly by affecting clouds and biogeochemical cycles. Recent Earth history has featured quasi-100,000-y, glacial−interglacial climate cycles with lower/higher temperatures and greenhouse gas concentrations during glacials/interglacials. Global average, glacial maxima dust levels were more than 3 times higher than during interglacials, thereby contributing to glacial cooling. However, the timing, strength, and overall role of dust−climate feedbacks over these cycles remain unclear. Here we use dust deposition data and temperature reconstructions from ice sheet, ocean sediment, and land archives to construct dust−climate relationships. Although absolute dust deposition rates vary greatly among these archives, they all exhibit striking, nonlinear increases toward coldest glacial conditions. From these relationships and reconstructed temperature time series, we diagnose glacial−interglacial time series of dust radiative forcing and iron fertilization of ocean biota, and use these time series to force Earth system model simulations. The results of these simulations show that dust−climate feedbacks, perhaps set off by orbital forcing, push the system in and out of extreme cold conditions such as glacial maxima. Without these dust effects, glacial temperature and atmospheric CO2 concentrations would have been much more stable at higher, intermediate glacial levels. The structure of residual anomalies over the glacial−interglacial climate cycles after subtraction of dust effects provides constraints for the strength and timing of other processes governing these cycles. is.9Thomson Reuters ISI
Zonas Costeras2018Toledo, F., Garrido, C., Díaz, M., Rondanelli, R., Jorquera, S., Valdivieso, P.AOT Retrieval Procedure for Distributed Measurements With Low-Cost Sun Photometers: AOT RETRIEVAL METHOD FOR SUN PHOTOMETERSJournal of Geophysical Research: Atmospheres10.1002/2017JD027309We propose a new application of inexpensive light-emitting diode (LED)-based Sun photometers, consisting of measuring the aerosol optical thickness (AOT) with high resolution within metropolitan scales. Previously, these instruments have been used at continental scales by the GLOBE program, but this extension is already covered by more expensive and higher-precision instruments of the AERONET global network. For this we built an open source two-channeled LED-based Sun photometer based on previous developments, with improvements in the hardware, software, and modifications on the calibration procedure. Among these we highlight the use of MODTRAN to characterize the effect introduced by using LED sensors in the AOT retrieval, an open design available for the scientific community and a calibration procedure that takes advantage of a CIMEL Sun photometer located within the city, enables the intercomparison of several LED Sun photometers with a common reference. We estimated the root-mean-square error in the AOT retrieved by the prototypes as 0.006 at the 564 nm and 0.009 at the 408 nm. This error is way under the magnitude of the AOT daily cycle variability measured by us in our campaigns, even for distances closer than 15 km. In addition to inner city campaigns, we also show aerosol-tracing applications by measuring AOT variations from the city of Santiago to the Andes glaciers. Measuring AOT at high spatial resolution in urban areas can improve our understanding of urban scale aerosol circulation, providing information for solar energy planning, health policies, and climatological studies, among others. is.2Thomson Reuters ISIaot, distributed measurement, sun photometer, aeronet, aerosol, calibration, electrode, energy planning, glacier, metropolitan area, photometer, solar power, spatial resolution, urban area, andes, chile, metropolitana
Ciudades Resilientes2018Urquiza A., Billi M.Water markets and social–ecological resilience to water stress in the context of climate change: an analysis of the Limarí Basin, ChileEnvironment, Development and Sustainability10.1007/s10668-018-0271-3The paper proposes an analysis of the social–ecological resilience of the Limarí Basin, an agriculture-intensive dryland in the north of Chile, featuring one of the most innovative market-based water managements and the most active water rights market in the country, but concurrently affected by an ongoing water stress situation. The Chilean water market, one of the main examples of the application of neoliberal policies in water management, has received mixed appraisals although, at present, few empirical studies evaluate the social and environmental conditions associated with their operation. This paper, on the contrary, maintains the necessity to assess the capacity of market-based models to face situations of water stress, particularly since mega-drought phenomena are projected to become a recurring and increasing problem during the following decades because of climate change. The study offers a mixed bottom-up and top-down qualitative empirical analysis of how the Chilean water market operates, providing relevant insights into four dimensions of the social–ecological resilience of the watershed: redundancy, diversity and flexibility; connectivity, collaboration and collective action; social–ecological memory and learning; self-organization and governance of system changes. The conclusion is that water scarcity is self-produced: despite the flexibility provided by market-based water management, the combined effect of strong deregulation, of the absence of territorial planning and integrated management of water resources, and of short-term attitudes and generalized mistrust, has led the system to the critical situation it is now facing. Reuters ISIchilean water code, climate change, social–ecological resilience, water governance, water markets, water stress, bottom-up approach, empirical analysis, environmental conditions, governance approach, innovation, qualitative analysis, self organization, territorial planning, top-down approach, water industry, water management, water planning, chile
Agua y Extremos; Cambio de Uso de Suelo2018Urrutia-Jalabert, R., González, M. E., González-Reyes, A., Lara, A., Garreaud, R.Climate variability and forest fires in central and south-central ChileEcosphere10.1002/ecs2.2171This paper evaluates the relationship between fire occurrence (number and burned area) and
climate variability (precipitation and maximum temperatures) across central and south-central Chile
(32°–43° S) during recent decades (1976–2013). This region sustains the largest proportion of the Chilean
population, contains ecologically important remnants of endemic ecosystems, the largest extension of
forest exotic plantations, and concentrates most of the fire activity in the country. Fire activity in central
Chile was mainly associated with above-average precipitation during winter of the previous year and
with dry conditions during spring to summer. The later association was particularly strong in the southern,
wetter part of the study region. Maximum temperature had a positive significant relationship with
burned area across the study region, with stronger correlations toward the south. Fires in central Chile
were significantly related to El Nino~ –Southern Oscillation, through rainfall anomalies during the year
previous to the fire season. The Antarctic Oscillation during winter through summer was positively
related to fires across the study area due to drier/warmer conditions associated with the positive polarity
of this oscillation. Climate change projections for the region reveal an all-season decrease in precipitation
and increases in temperature, that may likely result in an increment of the occurrence and the area
affected by fires, as it has been observed during a multi-year drought afflicting central Chile since 2010. is.4Thomson Reuters ISIantarctic oscillation, climate change, el niño–southern oscillation (enso), exotic plantations, forest fires, mediterranean forests, temperate forests
Cambio de Uso de Suelo2018Urrutia-Jalabert, R., Peña, M. P. Coopman, R. E., Carvajal, D. E., Jiménez-Castillo, M., Lara, A., Cosimo, D., Lobos-Catalán, P.
Elucidating the hydraulic vulnerability of the longest-lived Southern Hemisphere conifer to aridificationForest Ecology and Management
10.1016/j.foreco.2018.08.027Drier climatic conditions will be the future scenario in many regions worldwide, including southern South America. Few studies have characterized the ecophysiological vulnerability of the endemic tree species that inhabit this area, to climate change. In this study we assessed the hydraulic vulnerability of the longest-lived tree of the Southern Hemisphere, Fitzroya cupressoides, focusing on adult trees and saplings from two highly disturbed populations: the Coastal Range (AC) and Central Depression (FN) of southern Chile, which represent contrasting site conditions. This, as a basis for the design of conservation strategies to safeguard the persistence of these endangered forests in a drier future. We assessed water potentials (WP) throughout a growing season, their relationships with environmental conditions, as well as leaf and stem (branch) traits and hydraulic safety margins. Despite that the studied summer was the second driest in the last seven decades, minimum WP were not that negative (−1.3 to −1.5 MPa); which could be partly explained by a high leaf capacitance in this species. Adult trees and saplings from both sites did not significantly differ in their WP at turgor loss point, and their associated leaf safety margins, which were relatively low in all cases. However, they significantly differed in the xylem WP causing a 50% loss of stem conductivity (P50): adults AC: −5.14, saplings AC: −2.53, adults FN: −3.71, and saplings FN: −3.87 MPa. These values led to a relatively large stem safety margin (SSM) in most cases, and their variation was not explained neither by wood density, nor by tracheid size changes. Moreover, there appears to be an ontogenic adjustment in the more restrictive site AC, which was not seen in FN. Within the continuum of species strategies to cope with water stress, Fitzroya has features of the two ends of the continuum: tissues with large SSM, and tissues that sustain milder operation pressures through capacitance. Although Fitzroya appears to be relatively resistant to water scarcity, saplings from AC, seem to be the most vulnerable to the aridification trend in southern Chile. Moreover, future drying could become a significant extra threat to the highly endangered Central Depression population. Conservation actions are urgently needed to secure the future of Fitzroya forests in southern Chile. Reuters ISIclimate change, fitzroya cupressoides, hydraulic vulnerability, safety margins, southern south america, temperate rainforests, capacitance, histology, tissue, conservation actions, conservation strategies, environmental conditions, safety margin, southern hemisphere, temperate rainforest, forestry, aridification, climate conditions, coniferous forest, conservation management, ecophysiology, endangered species, endemic species, growing season, hydraulic conductivity, rainforest, safety, temperate environment, vulnerability, fitzroya, saplings, chile, coastal range taiwan, south america, taiwan, coniferophyta
Ciudades Resilientes2018Valenzuela, D., Cartagena, I., Santoro, C.M., Castro, V., Gayo, E.M.Andean caravan ceremonialism in the lowlands of the Atacama Desert: The Cruces de Molinos archaeological site, northern ChileQuaternary International10.1016/j.quaint.2018.09.016Camelid caravans have played a key role in the complex systems of interregional social interaction that characterizes Andean history. In the northernmost region of Chile, the most frequent archaeological indicators of these caravan systems are trails and rock art images. Cruces de Molinos (LL-43), a rock art site in the Lluta valley, 1100 masl, 40 km from the Pacific littoral, expands the ceremonial role of rock art sites, materialized, not only as regards the iconography portrayed and alluding to these practices, but also in terms of articulated carcass remains and detached anatomical units of camelids, intentionally deposited in a cache beneath one of the engraved blocks. This paper analyzes the site considering the visual imagery, spatial location, archaeological deposits and features associated with rock art. Based on the predominance of camelid and caravan motifs in rock art images, the extraordinary setting and location of the site on the valley's upper slopes, which is far removed from local settlements, but closely connected with a llama caravan trade network linking the chaupiyunga ecozone with the highlands (sierra and Altiplano ecozones), we suggest that Cruces de Molinos was not a rest stop for caravanners, but a ceremonial place, and not for local farmers, but for highland herders. According to seven accelerator mass spectrometry (AMS) dates that place the occupation between cal. 1060–1190 CE in the Late Intermediate period. Reuters ISIcamelid, caravan, ceremonialism, "charki", rock art, archaeological evidence, iconography, mammal, settlement history, spatiotemporal analysis, atacama desert, chile, camelidae, lama (mammal)
Agua y Extremos2018Valenzuela, R. A., Kingsmill, D. E.
Terrain-Trapped Airflows and Orographic Rainfall along the Coast of Northern California. Part II: Horizontal and Vertical Structures Observed by a Scanning Doppler RadarMonthly Weather Review10.1175/MWR-D-17-0227.1This study documents the mean properties and variability of kinematic and precipitation structures associated with orographic precipitation along the coast of Northern California in the context of terrain-trapped airflows (TTAs). TTAs are defined as relatively narrow air masses that consistently flow in close proximity and approximately parallel to an orographic barrier. Seven land-falling winter storms are examined with observations from a scanning X-band Doppler radar deployed on the coast at Fort Ross, California. Additional information is provided by a 915-MHz wind-profiling radar, surface meteorology, a GPS receiver, and balloon soundings. The composite kinematic structure during TTA conditions exhibits a significant horizontal gradient of wind direction from the coast to approximately 50 km offshore and a low-level jet (LLJ) that surmounts a weaker airflow offshore corresponding to the TTA, with a zone of enhanced precipitation evident between ~5 and 25 km offshore and oriented nearly parallel to the coastline. Conversely, the composite kinematic structure during NO-TTA conditions exhibits a smaller offshore horizontal gradient of wind direction and precipitation structures are generally enhanced within ~15 km of the coastline. Interstorm variability analysis reveals significant variations in kinematic structures during both TTA and NO-TTA conditions, whereas significant variations in precipitation structures are only evident during TTA conditions. The interstorm analysis also illustrates more clearly how LLJ vertical structures evident during NO-TTA conditions exhibit ascent along the coast and over the coastal mountains, which is in contrast to TTA conditions where the ascent occurs offshore and over the TTA. is.8Thomson Reuters ISIchannel flows, coastal meteorology, kinematics, orographic effects, precipitation, radars/radar observations, atmospheric movements, channel flow, doppler radar, global positioning system, landforms, precipitation (chemical), storms, coastal meteorologies, horizontal gradients, kinematic structures, orographic precipitation, orographic rainfalls, precipitation structure, precipitation (meteorology), airflow, coastal zone, hydrometeorology, orographic effect, precipitation assessment, rainfall, terrain, wind direction, california, united states
Cambio y Uso de Suelo2018Vargas, C. A., Cuevas, L. A., Silva, N., González, H. E., De Pol-Holz, R., Narváez, D. A.Influence of Glacier Melting and River Discharges on the Nutrient Distribution and DIC Recycling in the Southern Chilean PatagoniaJournal of Geophysical Research: Biogeosciences10.1002/2017JG003907The Chilean Patagonia constitutes one of the most important and extensive fjord systems worldwide, therefore can be used as a natural laboratory to elucidate the pathway of both organic and inorganic matter in the receiving environment. In this study we use data collected during an intensive oceanographic cruise along the Magellan Strait into the Almirantazgo Fjord in southern Patagonia to evaluate how different sources of dissolved inorganic carbon (DIC) and recycling may impact particulate organic carbon (POC) δ13C and influence the nutrients and carbonate system spatial distribution. The carbonate system presented large spatial heterogeneity. The lowest total alkalinity and DIC were associated to freshwater dilution observed near melting glaciers. The δ13CDIC analysis suggests that most DIC in the upper 50 m depth was not derived from terrestrial organic matter remineralization. 13C-depleted riverine and ice-melting DIC influence the DIC pool along the study area, but due to that DIC concentration from rivers and glaciers is relatively low, atmospheric carbon contribution or biological processes seem to be more relevant. Intense undersaturation of CO2 was observed in high chlorophyll waters. Respired DIC coming from the bottom waters seems to be almost insignificant for the inorganic carbon pool and therefore do not impact significantly the stable carbon isotopic composition of dissolved organic carbon and POC in the upper 50 m depth. Considering the combined effect of cold and low alkalinity waters due to ice melting, our results highlight the importance of these processes in determining corrosive waters for CaCO3 and local acidification processes associated to calving glacier in fjord ecosystems. is.1Thomson Reuters ISIcarbon chemistry, carbon dynamic, fjord, ocean acidification, alkalinity, carbon cycle, carbon isotope, carbonate system, chlorophyll, dissolved inorganic carbon, glacier, melting, nutrient dynamics, organic matter, particulate organic carbon, remineralization, river discharge, spatial distribution, chile, magellan strait, patagonia
Agua y Extremos2018Viale M., Valenzuela R., Garreaud R.D., Ralph F.M.Impacts of Atmospheric Rivers on Precipitation in Southern South AmericaJournal of Hydrometeorology10.1175/JHM-D-18-0006.1This study quantifies the impact of atmospheric rivers (ARs) on precipitation in southern South America. An AR detection algorithm was developed based on integrated water vapor transport (IVT) from 6-hourly CFSR reanalysis data over a 16-yr period (2001-16). AR landfalls were linked to precipitation using a comprehensive observing network that spanned large variations in terrain along and across the Andes from 27° to 55°S, including some sites with hourly data. Along the Pacific (west) coast, AR landfalls are most frequent between 38° and 50°S, averaging 35-40 days yr-1. This decreases rapidly to the south and north of this maximum, as well as to the east of the Andes. Landfalling ARs are more frequent in winter/spring (summer/fall) to the north (south) of ~43°S. ARs contribute 45%-60% of the annual precipitation in subtropical Chile (37°-32°S) and 40%-55% along the midlatitude west coast (37°-47°S). These values significantly exceed those in western North America, likely due to the Andes being taller. In subtropical and midlatitude regions, roughly half of all events with top-quartile precipitation rates occur under AR conditions. Median daily and hourly precipitation in ARs is 2-3 times that of other storms. The results of this study extend knowledge of the key roles of ARs on precipitation, weather, and climate in the South American region. They enable comparisons with other areas globally, provide context for specific events, and support local nowcasting and forecasting. © 2018 American Meteorological Society. is.10Thomson Reuters ISIextratropical cyclones, precipitation, south america, south pacific ocean, topographic effects, water vapor, atmospheric transport, extratropical cyclone, precipitation (climatology), regional climate, topographic effect, pacific ocean, pacific ocean (south)
Zonas Costeras2019Wilson,ST.,Bange ,H.W, Arévalo-Martínez,D.L. ,Barnes, J, Borges, A.V, Brown, I, Bullister,JohnL, Burgos,M, Capelle,D.W., Casso, M, De la Paz, M, Farías, L, Fenwick,L, Ferrón,S,Garcia, G, Glockzin, M, Karl, D.M, Kock,A, Laperriere,S, Law, C.S, Manning,C.C, Marriner,A, Myllykangas,J-P., Pohlman,J.W., Rees, A.P, Santoro,A.E, Torres, M, Tortell, PD, Upstill-Goddard,R.C,.Wisegarver, D.P, Zhang,G.L, Rehder, G.An intercomparison of oceanic methane and nitrous oxide measurementsBiogeosciences10.5194/bg-15-5891-2018Large-scale climatic forcing is impacting oceanic biogeochemical cycles and is expected to influence the water-column distribution of trace gases, including methane and nitrous oxide. Our ability as a scientific community to evaluate changes in the water-column inventories of methane and nitrous oxide depends largely on our capacity to obtain robust and accurate concentration measurements that can be validated across different laboratory groups. This study represents the first formal international intercomparison of oceanic methane and nitrous oxide measurements whereby participating laboratories received batches of seawater samples from the subtropical Pacific Ocean and the Baltic Sea. Additionally, compressed gas standards from the same calibration scale were distributed to the majority of participating laboratories to improve the analytical accuracy of the gas measurements. The computations used by each laboratory to derive the dissolved gas concentrations were also evaluated for inconsistencies (e.g., pressure and temperature corrections, solubility constants). The results from the intercomparison and intercalibration provided invaluable insights into methane and nitrous oxide measurements. It was observed that analyses of seawater samples with the lowest concentrations of methane and nitrous oxide had the lowest precisions. In comparison, while the analytical precision for samples with the highest concentrations of trace gases was better, the variability between the different laboratories was higher: 36% for methane and 27% for nitrous oxide. In addition, the comparison of different batches of seawater samples with methane and nitrous oxide concentrations that ranged over an order of magnitude revealed the ramifications of different calibration procedures for each trace gas. Finally, this study builds upon the intercomparison results to develop recommendations for improving oceanic methane and nitrous oxide measurements, with the aim of precluding future analytical discrepancies between laboratories. is.19Thomson Reuters ISI-
Transversal2018Xoplaki, E., Luterbacher, J., Wagner, S., Zorita, E., Fleitmann, D., Preiser-Kapeller, J., Sargent, A. M., White, S., Toreti, A., Haldon, J. F., Mordechai, L., Bozkurt, D., Akçer-Ön, S., Izdebski, A.Modelling Climate and Societal Resilience in the Eastern Mediterranean in the Last MillenniumHuman Ecology10.1007/s10745-018-9995-9This article analyses high-quality hydroclimate proxy records and spatial reconstructions from the Central and Eastern Mediterranean and compares them with two Earth System Model simulations (CCSM4, MPI-ESM-P) for the Crusader period in the Levant (1095–1290 CE), the Mamluk regime in Transjordan (1260–1516 CE) and the Ottoman crisis and Celâlî Rebellion (1580–1610 CE). During the three time intervals, environmental and climatic stress tested the resilience of complex societies. We find that the multidecadal precipitation and drought variations in the Central and Eastern Mediterranean cannot be explained by external forcings (solar variations, tropical volcanism); rather they were driven by internal climate dynamics. Our research emphasises the challenges, opportunities and limitations of linking proxy records, palaeoreconstructions and model simulations to better understand how climate can affect human history. is.3Thomson Reuters ISIcmip5 models, complex societies, early modern period, eastern mediterranean, first millennium, middle ages, model/data comparison, palaeoclimatology, resilience, anthropology, climate effect, climate modeling, cmip, paleoclimate, proxy climate record, reconstruction, levant, mediterranean region
Zonas Costeras2018Yevenes, MA., Figueroa, R., Parra., O
Seasonal drought effects on the water quality of the Biobío River, Central Chile
Environmental Science and Pollution Research10.1007/s11356-018-1415-6Quantifying the effect of droughts on ecosystem functions is essential to the development of coastal zone and river management under a changing climate. It is widely acknowledged that climate change is increasing the frequency and intensity of droughts, which can affect important ecosystem services, such as the regional supply of clean water. Very little is understood about how droughts affect the water quality of Chilean high flow rivers. This paper intends to investigate the effect of an, recently identified, unprecedented drought in Chile (2010–2015), on the Biobío River water quality, (36°45′–38°49′ S and 71°00′–73°20′ W), Central Chile. This river is one of the largest Chilean rivers and it provides abundant freshwater. Water quality (water temperature, pH, dissolved oxygen, electrical conductivity, biological oxygen demand, total suspended solids, chloride, sodium, nutrients, and trace metals), during the drought (2010–2015), was compared with a pre-drought period (2000–2009) over two reaches (upstream and downstream) of the river. Multivariate analysis and seasonal Mann-Kendall trend analyses and a Theil-Sen estimator were employed to analyze trends and slopes of the reaches. Results indicated a significant decreased trend in total suspended solids and a slightly increasing trend in water temperature and EC, major ions, and trace metals (chrome, lead, iron, and cobalt), mainly in summer and autumn during the drought. The reduced variability upstream suggested that nutrient and metal concentrations were more constant than downstream. The results evidenced, due to the close relationship between river discharge and water quality, a slightly decline of the water quality downstream of the Biobío River during drought period, which could be attenuated in a post-drought period. These results displayed that water quality is vulnerable to reductions in flow, through historical and emerging solutes/contaminants and induced pH mobilization. Consequently, seasonal changes and a progressive reduction of river flow affect the ecosystem functionality in this key Chilean river. The outcomes from this research can be used to improve how low flow conditions and the effects of a reduction in the river volume and discharge are assessed, which is the case under the scenario of more frequent drought periods. is,14Thomson Reuters ISIbiobío river, ecosystem functions, mega-drought, river discharge, water quality, water supply, climate change, drought, ecosystem function, ecosystem service, river flow, river management, seasonal variation, water temperature, biobio river, chile, analysis, chemistry, environmental monitoring, river, season, water pollutant, droughts, rivers, seasons, water pollutants, chemical
Zonas Costeras2018Masotti, I., Aparicio-Rizzo, P., Yevenes, M. A., Garreaud, R., Farias, L.The influence of river discharge on nutrient export and phytoplankton biomass off the Central Chile coast (33º-37ºS). Seasonal cycle and interannual variabilityFrontiers in Marine Science10.3389/fmars.2018.00423Using in situ hydro-chemical data and MODIS-SeaWiFS ocean color images as a proxy of river plumes and phytoplankton biomass from 2000 to 2014, this study documents the temporal co-variability of river discharge, plume area, nitrate and phosphate export and phytoplankton biomass in the coastal waters off Central Chile (33º-37ºS). Five major rivers (Maipo, Mataquito, Maule, Itata and Biobío) drain into this region with annual mean discharge ranging from 120 to 1000 m3 s-1. River discharge and coastal plume area present a marked seasonal cycle, reaching maximum values during the winter rainy season (June-September). Export of riverine nutrients also peaks in winter, leading to an increase in phytoplankton biomass within the plumes that can be twice larger than the background values in coastal areas away from the river mouths. Wintertime river discharge, plume area and nutrient export are also correlated at interannual time scales. During a recent extended dry period (2010-2014), river discharges, plume areas and nutrient export clearly decreased by about 50% compared to historical values, reducing significantly the size of the chlorophyll pool within plumes off Central Chile during winter. The potential impacts of droughts are discussed in terms of coastal ecology and primary production, a highly relevant issue considering the projections of a dry climate over Central Chile in the future. Systematic evidence of mega-drought effects upon coastal productivity still does not exist, but it remains a priority to further investigate and quantify these impacts.impressScopuscentral chile, drought, nutrient export, phytoplankton biomass, river discharge, satellite remote sensing
Zonas Costeras2018Masotti, I., Aparicio-Rizzo, P., Yevenes, M. A., Garreaud, R., Farias, L.The influence of river discharge on nutrient export and phytoplankton biomass off the Central Chile coast (33º-37ºS). Seasonal cycle and interannual variabilityFrontiers in Marine Science10.3389/fmars.2018.00423Using in situ hydro-chemical data and MODIS-SeaWiFS ocean color images as a proxy of river plumes and phytoplankton biomass from 2000 to 2014, this study documents the temporal co-variability of river discharge, plume area, nitrate and phosphate export and phytoplankton biomass in the coastal waters off Central Chile (33º-37ºS). Five major rivers (Maipo, Mataquito, Maule, Itata and Biobío) drain into this region with annual mean discharge ranging from 120 to 1000 m3 s-1. River discharge and coastal plume area present a marked seasonal cycle, reaching maximum values during the winter rainy season (June-September). Export of riverine nutrients also peaks in winter, leading to an increase in phytoplankton biomass within the plumes that can be twice larger than the background values in coastal areas away from the river mouths. Wintertime river discharge, plume area and nutrient export are also correlated at interannual time scales. During a recent extended dry period (2010-2014), river discharges, plume areas and nutrient export clearly decreased by about 50% compared to historical values, reducing significantly the size of the chlorophyll pool within plumes off Central Chile during winter. The potential impacts of droughts are discussed in terms of coastal ecology and primary production, a highly relevant issue considering the projections of a dry climate over Central Chile in the future. Systematic evidence of mega-drought effects upon coastal productivity still does not exist, but it remains a priority to further investigate and quantify these impacts.impressScopuscentral chile, drought, nutrient export, phytoplankton biomass, river discharge, satellite remote sensing
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Comentario a la Sentencia de la Corte Suprema, de 29 de diciembre de 2017Actualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Sentencia del Tribunal Ambiental de Santiago, de 5 de enero de 2018Actualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Sentencia Corte Suprema, de 31 de agosto de 2017Actualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Comentario Sentencia Corte Suprema de Colombia, de 5 de abril de 2018Actualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Ley Marco sobre Cambio Climático (Perú)Actualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Comentario Sentencia Corte Suprema, 22 de mayo de 2018Actualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Sentencia Tribunal Constitucional, Proyecto de Ley que “Prohíbe la entrega de bolsas plásticas de comercio en todo el territorio nacional”, 10 de julio de 2018Actualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P.Comentario Sentencia del Tribunal Administrativo de Boyacá de 9 de agosto de 2018, sobre Páramo de PisbaActualidad Jurídica Ambiental published onlineNot indexed
Gobernanza e Interfaz entre Ciencia y Política2018Moraga, P., Ortiz, M.Comentario Sentencia Corte Suprema, 6 de septiembre de 2018Actualidad Jurídica Ambiental published onlineNot indexed
Ciudades Resilientes2018Montedonico, M., Herrera-Neira, F., Marconi, A., Urquiza, A.Co-construcción en proyectos de generación distribuida con energía solar: participación de la comunidad en el proyecto Ayllu SolarEstudios Avanzados, 29 published onlineNot indexed
Agua y Extremos2018Zambrano, M., Guosheng, L., Haddad, Z.Temporal and spatial evaluation of long-term satellite-based precipitation products across the complex topographical and climatic gradients of ChileRemote Sensing and Modeling of the Atmosphere, Oceans, and Interactions VII10.1117/12.2513645Satellite-based rainfall estimates (SRE) have become a promising data source to overcome some limitations of ground-based rainfall measurements, in particular for hydrological and other environmental applications. This study evaluates the spatial and temporal performance of four long-term SRE products (TMPA 3B42v7, CHIRPSv2, MSWEPv1.1 and MSWEPv2.2) over the complex topography and climatic gradients of Chile. Time series of precipitation measured at 371 stations are compared against the corresponding grid cell of each SRE (in their original spatial resolution) at different temporal scales (daily, monthly, seasonal, annual). The modified Kling-Gupta efficiency along with its three individual components were used to assess the performance of each SRE, while two categorical indices (POD, and fBIAS) were used to evaluate the skill of each SRE to correctly capture different precipitation intensities.Results revealed that all SREs performed best in Central-Southern Chile (32.18-36.4°S), in particular at lowand mid-elevation zones (0-1000 m a.s.l.). Seasonally, all products performed best in terms of KGE0 during the wet autumn and winter seasons (MAM-JJA) compared to summer (DJF). In addition, all SREs were able to correctly identify no rain events, but during rainy days all SREs that did not use a local dataset of precipitation to recalibrate their estimates presented a low skill in providing an accurate classification of different precipitation intensities. Overall, MSWPEPv22 showed the best performance at all time scales and country-wide, due to the use of a Chilean dataset of daily data for calibrating its precipitation estimates, making it a good candidate for hydrological applications in Chile. Finally, we conclude that when the in situ precipitation dataset used in the evaluation of different SREs does not cover the headwaters of the catchments, the obtained performances should only be considered as first guess about how well a given SRE represent the real amount of water in an area. indexed
Ciudades Resilientes2018Urquiza, A.The Role of Qualitative Approaches in Developing Long-Term StrategiesWorld Resources Institute indexed
Ciudades Resilientes2018Urquiza, A.Sociología económica y teoría de sistemas: Sobre La economía de la sociedad de Niklas LuhmannCuadernos de Teoría Social, año 3, número 6 indexed
Agua y Extremos, Gobernanza e Interfaz Ciencia y Política2018Sapiains, R, Ugarte, A, Aldunce, P.Los significados de la participación para el cambio climático en ChileAmbiente y Desarrollo10.11144/Javeriana.ayd21-41.spccEste artículo analiza los distintos significados del concepto de participación, para avanzar hacia un modelo más inclusivo de gobernanza del cambio climático en Chile. Para ello, se presenta una revisión bibliográfica que discute distintas epistemologías, teorías y definiciones de la participación, con énfasis en las dificultades para su implementación en el contexto chileno. Posteriormente, se revisan los mecanismos de participación ciudadana desplegados en el desarrollo de instrumentos de gobernanza del cambio climático existentes en Chile. Se distinguen tipos de participación utilizados y se identifican experiencias conducidas desde la sociedad civil y la academia. Finalmente, se discuten los alcances y las limitaciones de los modelos de participación implementados y se resalta la importancia de incrementar la influencia de la sociedad civil y de mejorar los mecanismos existentes. Esto se explica por un escenario de cambio climático que posiblemente requerirá una mayor cantidad de actores involucrados en la toma de decisiones, para anticipar posibles divisiones frente al desarrollo de acciones de adaptación o mitigación más radicales, y que al mismo tiempo demandará mayores niveles de responsabilidad, compromiso y acción de la ciudadanía. is.41Thomson Reuters ESCI
Cambio de Uso de Suelo, Agua y Extremos2018González, M. E., Gómez-González, S., Lara, A., Garreaud, R., Díaz-Hormazabal, I.The 2010-2015 Megadrought and its influence on the fire regime in central and south-central ChileEcosphere10.1002/ecs2.2300Forest fire activity has increased in recent years in central and south-central Chile. Drought conditions have been associated with the increase of large wildfires, area burned and longer fire seasons. This study examines the influence of drought on fire regimes and discusses landscape management opportunities to decrease fire hazard. Specifically, we investigate the effect of the 2010–2015 Megadrought (MD) compared to 1990–2009 period on fire activity (fire-season length, number of fires and burned area across months, fire sizes, regions and vegetation cover types, simultaneity, and duration of fires) in central and south-central Chile (32°–39° S), using contemporary fire statistics derived from the Chilean Forest Service. For large fire events (>200 ha) the average season length increased by 67 d (44%), comparing 2010–2015 to 1990–2009. Earlier and later ignition dates resulted in extended fire seasons in MD years. During the MD, the number, area burned, simultaneity, and duration of large fires increased significantly compared to the control period, including the unprecedented occurrence of large fires during winter. The burned area in large fires increased in all vegetation types, during the MD compared to the control period, especially in the exotic plantation cover type. The regions that were most affected by fire (i.e., total area burned) during the MD wereMaule, B ıo-B ıo, and Araucan ıa (35–39° S) that concentrate >75% of forest plantations in Chile. Although both maximum temperatures and precipitation are drivers of fire activity, a simple attribution analysis indicates that the sustained rainfall deficit during 2010–2015 was the most critical factor in the enhanced fire activity. Future climate change predictions indicate more recurrent, intense, and temporally extended droughts for central and south-central Chile. Under this scenario, land-use planning and fire and forest management strategies must promote a more diverse and less flammable landscape mosaic limiting high load, homogenous, and continuous exotic plantations. is.8Thomson Reuters ISIdrought, fire regimes, fire-prone vegetation, fire-season length
Gobernanza e Interfaz entre Ciencia y Política, Ciudades Resilientes, Agua y Extremos2018Arriagada, R., Aldunce, P., Blanco, G., Ibarra, C., Moraga, P., Nahuelhual, L., O'Ryan, R., Urquiza, A., Gallardo, L.Climate change governance in the Anthropocene: Emergence of Polycentrism in ChileElem Sci Anth10.1525/elementa.329Multilateral efforts are essential to an effective response to climate change, but individual nations define climate action policy by translating local and global objectives into adaptation and mitigation actions. We propose a conceptual framework to explore opportunities for polycentric climate governance, understanding polycentricity as a property that encompasses the potential for coordinating multiple centers of semiautonomous decision-making. We assert that polycentrism engages a diverse array of public and private actors for a more effective approach to reducing the threat of climate change. In this way, polycentrism may provide an appropriate strategy for addressing the many challenges of climate governance in the Anthropocene. We review two Chilean case studies: Chile’s Nationally Determined Contribution on Climate Change and the Chilean National Climate Change Action Plan. Our examination demonstrates that Chile has included a diversity of actors and directed significant financial resources to both processes. The central government coordinated both of these processes, showing the key role of interventions at higher jurisdictional levels in orienting institutional change to improve strategic planning and better address climate change. Both processes also provide some evidence of knowledge co-production, while at the same time remaining primarily driven by state agencies and directed by technical experts. Efforts to overcome governance weaknesses should focus on further strengthening existing practices for climate change responses, establishing new institutions, and promoting decision-making that incorporates diverse social actors and multiple levels of governance. In particular, stronger inclusion of local level actors provides an opportunity to enhance polycentric modes of governance and improve climate change responses. Fully capitalizing on this opportunity requires establishing durable communication channels between different levels of governance. is.1Thomson Reuters ISIchile, climate change, governance, polycentrism, public consultation, action plan, adaptive management, anthropocene, conceptual framework, decision making, environmental policy, financial system, governance approach, mitigation, strategic approach
Cambio de Uso de Suelo2018Gómez-González S., M. González, S. Paula, I. Díaz, A. Lara, M. Delgado-BaquerizoTemperature and agriculture are largely associated with fire activity in Central Chile across different temporal periodsForest Ecology and Management10.1016/j.foreco.2018.11.041Wildfires have important ecological and socio-economic implications worldwide. Identifying the major ecological drivers regulating fire activity across space and time is critical to formulating sustainable policies of landscape planning and management under global change scenarios. However, large scale studies quantifying the relative importance of relevant fire drivers across different time periods are largely lacking. We conducted a high-resolution spatial survey in Central Chile and used structural equation models (SEMs) to evaluate the direct and indirect effects of climate, human impact, land uses, and topography on the number of fires and burned area across two distinct periods of time (2000–2005 and 2011–2016). Mean temperature and agricultural use had the highest direct positive effect on the number of fires and burned area in the two studied periods, and thus were the major ecological predictors of fire activity. Human impact was also an important predictor of fire attributes. Topography had multiple indirect effects on fire activity by regulating land use, temperature, and human impact, but direct effects were negligible. Precipitation seasonality, drought and aridity indexes, native forests, and plantations, were less relevant predictors of fire activity. Even so, our SEMs suggested that areas dominated by native forests tended to have lower number of fires than those covered by croplands or plantations. Our results suggest that fire activity in Central Chile will be highly sensitive to increases in human pressure, land use change and warming by climate change. Because the relative importance of the predictors of fire activity was steady over time, the knowledge derived from this study provides critical insights for preventive fire management and landscape planning. The control of stubble burning, native forest restoration and sustainable forestry management could improve social adaptation to a fire-prone future. Reuters ISIdrought, human impact, land use change, mediterranean-type climate, topography, wildfires, climate change, climate models, conservation, ecology, economics, forestry, land use, land-use change, large-scale studies, structural equation models, sustainable forestry, sustainable policies, fires, agriculture, anthropogenic effect, fire, fire management, landscape planning, mediterranean environment, temperature, wildfire, chile
Agua y Extremos2018Bowman,D., Moreira-Muñoz, A., Kolden, F., Chávez, A., Muñoz, R., Salinas, F., González-Reyes, G., Rocco, N., de la Barrera, F., Williamson, G., Borchers, N., Cifuentes, L., Abatzoglou, F., JohnstonHuman–environmental drivers and impacts of the globally extreme 2017 Chilean firesAmbio10.1007/s13280-018-1084-1In January 2017, hundreds of fires in Mediterranean Chile burnt more than 5000 km2, an area nearly 14 times the 40-year mean. We contextualize these fires in terms of estimates of global fire intensity using MODIS satellite record, and provide an overview of the climatic factors and recent changes in land use that led to the active fire season and estimate the impact of fire emissions to human health. The primary fire activity in late January coincided with extreme fire weather conditions including all-time (1979–2017) daily records for the Fire Weather Index (FWI) and maximum temperature, producing some of the most energetically intense fire events on Earth in the last 15-years. Fire activity was further enabled by a warm moist growing season in 2016 that interrupted an intense drought that started in 2010. The land cover in this region had been extensively modified, with less than 20% of the original native vegetation remaining, and extensive plantations of highly flammable exotic Pinus and Eucalyptus species established since the 1970s. These plantations were disproportionally burnt (44% of the burned area) in 2017, and associated with the highest fire severities, as part of an increasing trend of fire extent in plantations over the past three decades. Smoke from the fires exposed over 9.5 million people to increased concentrations of particulate air pollution, causing an estimated 76 premature deaths and 209 additional admissions to hospital for respiratory and cardiovascular conditions. This study highlights that Mediterranean biogeographic regions with expansive Pinus and Eucalyptus plantations and associated rural depopulation are vulnerable to intense wildfires with wide ranging social, economic, and environmental impacts, which are likely to become more frequent due to longer and more extreme wildfire seasons. Reuters ISIfire weather, forest plantations, land cover change, mediterranean climate, smoke pollution, wildfire, atmospheric pollution, extreme event, forest fire, health risk, land cover, mediterranean environment, modis, native species, pollution incidence, satellite altimetry, smoke, chile, eucalyptus, drought, fire, human, pine, weather, droughts, fires, humans, pinus
Agua y Extremos2018Yáñez-Morroni, G., Gironás, J., Caneo, M., Delgado, R., Garreaud, R.Using the Weather Research and Forecasting (WRF) Model for Precipitation Forecasting in an Andean Region with Complex TopographyAtmosphere10.3390/atmos9080304The Weather Research and Forecasting (WRF) model has been successfully used in weather prediction, but its ability to simulate precipitation over areas with complex topography is not optimal. Consequently, WRF has problems forecasting rainfall events over Chilean mountainous terrain and foothills, where some of the main cities are located, and where intense rainfall occurs due to cutoff lows. This work analyzes an ensemble of microphysics schemes to enhance initial forecasts made by the Chilean Weather Agency in the front range of Santiago. We first tested different vertical levels resolution, land use and land surface models, as well as meteorological forcing (GFS/FNL). The final ensemble configuration considered three microphysics schemes and lead times over three rainfall events between 2015 and 2017. Cutoff low complex meteorological characteristics impede the temporal simulation of rainfall properties. With three days of lead time, WRF properly forecasts the rainiest N-hours and temperatures during the event, although more accuracy is obtained when the rainfall is caused by a meteorological frontal system. Finally, the WSM6 microphysics option had the best performance, although further analysis using other storms and locations in the area are needed to strengthen this result. is.8Thomson Reuters ISIandean watershed, complex topography, flash floods, rainfall, wrf forecast, land use, rain, topography, complex topographies, flash flood, land surface models, meteorological forcing, mountainous terrain, precipitation forecasting, temporal simulation, weather research and forecasting models, weather forecasting, atmospheric modeling, computer simulation, ensemble forecasting, precipitation (climatology), regional climate, temporal analysis, urban atmosphere
Agua y Extremos2018Barrios, A., Trincado, G., Garreaud, R.Alternative approaches for estimating missing climate data: application to monthly precipitation records in South-Central ChileForest Ecosystems10.1186/s40663-018-0147-xBackground :Over the last decades interest has grown on how climate change impacts forest resources. However, one of the main constraints is that meteorological stations are riddled with missing climatic data. This study compared five approaches for estimating monthly precipitation records: inverse distance weighting (IDW), a modification of IDW that includes elevation differences between target and neighboring stations (IDWm), correlation coefficient weighting (CCW), multiple linear regression (MLR) and artificial neural networks (ANN). Methods: A complete series of monthly precipitation records (1995–2012) from twenty meteorological stations located in central Chile were used. Two target stations were selected and their neighboring stations, located within a radius of 25 km (3 stations) and 50 km (9 stations), were identified. Cross-validation was used for evaluating the accuracy of the estimation approaches. The performance and predictive capability of the approaches were evaluated using the ratio of the root mean square error to the standard deviation of measured data (RSR), the percent bias (PBIAS), and the Nash-Sutcliffe efficiency (NSE). For testing the main and interactive effects of the radius of influence and estimation approaches, a two-level factorial design considering the target station as the blocking factor was used. Results: ANN and MLR showed the best statistics for all the stations and radius of influence. However, these approaches were not significantly different with IDWm. Inclusion of elevation differences into IDW significantly improved IDWm estimates. In terms of precision, similar estimates were obtained when applying ANN, MLR or IDWm, and the radius of influence had a significant influence on their estimates, we conclude that estimates based on nine neighboring stations located within a radius of 50 km are needed for completing missing monthly precipitation data in regions with complex topography. Conclusions: It is concluded that approaches based on ANN, MLR and IDWm had the best performance in two sectors located in south-central Chile with a complex topography. A radius of influence of 50 km (9 neighboring stations) is recommended for completing monthly precipitation data. is.1Thomson Reuters ISIartificial neural networks, climatological data, cross-validation, multiple linear regression
Agua y Extremos2018Garreaud, R. D.Tres niños sorprendentesBoletín Técnico Instituto de Geofísica del Perú (IGP) is.1Not indexed
Agua y Extremos, Cambio de Uso de Suelo2018Alvarez-Garreton, C., Mendoza, P. A., Boisier, J. P., Addor, N., Galleguillos, M., Zambrano-Bigiarini, M., Lara, A., Puelma, C., Cortes, G., Garreaud, R., McPhee, J., Ayala, A.The CAMELS-CL dataset - links to files. PANGAEA, Data Publisher for Earth & Environmental Science10.1594/PANGAEA.894885 indexed
Ciudades Resilientes2018Urquiza A., Amigo C., Billi M., Espinosa P.Participatory Energy Transitions as Boundary Objects: The Case of Chile's Energía2050Frontiers in Energy Research10.3389/fenrg.2018.00134This paper analyzes the use of “participatory futures” within the context of energy transition, paying special attention to the case of Chile's long-term energy policy. Our main aim is to question the role of “participation” in such a context and particularly, to decouple the operative function of participation from its normative function. Structurally, we argue that the construction of a joint vision of desired energy futures must be understood as a deliberate attempt at governing the energy transition by way of governing the expectations of the actors and systems involved in it. Participatory approaches can promote the co-construction of such energy futures in the form of a boundary-object, able to resonate with and provide a common reference to the actors participating in its creation. On the other hand, participatory approaches can also be a way to make transitions more democratic, subjecting it to a broader influence and control from the citizenship. These two functions of “participation” are always potentially at odds with one another. Democratizing the transition, in fact, would require producing plural, dynamical imaginaries that are responsive and accountable to the public. On the contrary, the need to make transitions governable may close-up such imaginaries and narrow-down the participatory efforts to foster their normalization and acceptability on the part of the most influential actors in the self-government of the transition. To refine and exemplify our proposal, we perform a qualitative, exploratory case study of Chile's E2050 energy policy. Our findings show that “participation” may indeed have been used in the case to align partially conflicting expectations around a collectively-defined boundary object which may then act as a form of contextual, anticipatory and polycentric governance of the transition. However, from a democratic perspective, E2050 appears as a tokenization of the public in support of a pre-eminently technical and monolithic vision enacted by the Energy Ministry and the Consultative Committee. Within this context, the actual influence of the public on the policy and the possibility for political contestation are much more questionable. Reuters ESCIboundary object, chile, deliberative democracy, energy transitions, energía2050, polycentric governance, public participation, energy policy, boundary objects, public policy
Cambio de Uso de Suelo; Agua y Extremos2018Alvarez-Garreton, Camila; Mendoza, Pablo A.; Boisier, Juan Pablo; Addor, Nans; Galleguillos, Mauricio; Zambrano-Bigiarini, Mauricio; Lara, Antonio; Puelma, Cristóbal; Cortes, Gonzalo; Garreaud, Rene; McPhee, James; Ayala, AlvaroThe CAMELS-CL dataset: catchment attributes and meteorology for large sample studies – Chile datasetHydrology and Earth System Sciences10.5194/hess-22-5817-2018We introduce the first catchment dataset for large sample studies in Chile. This dataset includes 516 catchments; it covers particularly wide latitude (17.8 to 55.0°S) and elevation (0 to 6993ma.s.l.) ranges, and it relies on multiple data sources (including ground data, remote-sensed products and reanalyses) to characterise the hydroclimatic conditions and landscape of a region where in situ measurements are scarce. For each catchment, the dataset provides boundaries, daily streamflow records and basin-averaged daily time series of precipitation (from one national and three global datasets), maximum, minimum and mean temperatures, potential evapotranspiration (PET; from two datasets), and snow water equivalent. We calculated hydro-climatological indices using these time series, and leveraged diverse data sources to extract topographic, geological and land cover features. Relying on publicly available reservoirs and water rights data for the country, we estimated the degree of anthropic intervention within the catchments. To facilitate the use of this dataset and promote common standards in large sample studies, we computed most catchment attributes introduced by Addor et al. (2017) in their Catchment Attributes and MEteorology for Large-sample Studies (CAMELS) dataset, and added several others. We used the dataset presented here (named CAMELS-CL) to characterise regional variations in hydroclimatic conditions over Chile and to explore how basin behaviour is influenced by catchment attributes and water extractions. Further, CAMELS-CL enabled us to analyse biases and uncertainties in basin-wide precipitation and PET. The characterisation of catchment water balances revealed large discrepancies between precipitation products in arid regions and a systematic precipitation underestimation in headwater mountain catchments (high elevations and steep slopes) over humid regions. We evaluated PET products based on ground data and found a fairly good performance of both products in humid regions (r > 0.91) and lower correlation (r < 0.76) in hyper-arid regions. Further, the satellite-based PET showed a consistent overestimation of observation-based PET. Finally, we explored local anomalies in catchment response by analysing the relationship between hydrological signatures and an attribute characterising the level of anthropic interventions. We showed that larger anthropic interventions are correlated with lower than normal annual flows, runoff ratios, elasticity of runoff with respect to precipitation, and flashiness of runoff, especially in arid catchments. CAMELS-CL provides unprecedented information on catchments in a region largely underrepresented in large sample studies. This effort is part of an international initiative to create multi-national large sample datasets freely available for the community. CAMELS-CL can be visualised from and downloaded from is.11Thomson Reuters ISIarid regions, catchments, remote sensing, reservoirs (water), snow, time series, uncertainty analysis, catchment water balance, hydroclimatic conditions, in-situ measurement, multiple data sources, potential evapotranspiration, precipitation products, regional variation, snow water equivalent, runoff, catchment, climate conditions, data set, headwater, hydrometeorology, land cover, meteorological hazard, precipitation (climatology), streamflow, water budget, chile, camelidae
Agua y Extremos, Ciudades Resilientes, Gobernanza e Interfaz entre Ciencia y Política2018Boisier, J.P., Alvarez-Garreton, C., Cordero, R.R., Damiani, A., Gallardo, L., Garreaud, R.D., Lambert, F., Ramallo, C., Rojas, M., Rondanelli, R.Anthropogenic drying in central-southern Chile evidenced by long-term observations and climate model simulationsElementa: Science of the Anthropocene10.1525/elementa.328Since 1981, water allocation in Chile has been based on a water use rights (WURs) market, with limited regulatory and supervisory mechanisms. The volume to be granted as permanent and eventual WURs is calculated from streamflow records, if stream gauge data are available, or from hydrologic parameter transfer from gauged to ungauged catchments, usually with less than 50 years of record. To test the per- formance of this allocation system, while analyzing the long-term natural variability in water resources, we investigated a 400 year-long (1590–2015) tree-ring reconstruction of runoff and historical water rights for Perquilauquén at Quella catchment, a tributary to the Maule River in Central Chile (35°S–36°30S). Furthermore, we assess how the current legislation would perform under a projected climate scenario, based on historical climate simulations of runoff calibrated against observed data, and future projections. Our analyses indicate that the allocation methodology currently applied by the Water Authority in Chile is very sensitive to the time window of data used, which leads to an underestimation of variability and long-term trends. According to the WURs database provided by the Chilean Water Directorate, WURs at Perquilauquén at Quella are already over-allocated. Considering regional climate projections, this condition will be exacerbated in the future. Furthermore, serious problems regarding the access and quality of infor- mation on already-granted WURs and actual water usage have been diagnosed, which further encumber environmental strategies to deal with and adapt to climate change. We emphasize the urgent need for a review and revision of current water allocation methodologies and water law in Chile, which are not concordant with the dynamics and non-stationarity of hydrological processes. Water scarcity and water governance are two of the key issues to be faced by Chile in the Anthropocene. is.1Thomson Reuters ISIchile, climate change, drought, drying trends, greenhouse gas and ozone depletion, southern annular mode, anthropogenic effect, carbon emission, climate modeling, greenhouse gas, long-term change, ozone depletion, simulation, streamflow, trend analysis, vulnerability
Agua y Extremos, Ciudades Resilientes, Gobernanza e Interfaz entre Ciencia y Política, Transversal2019Barría, P., Rojas, M., Moraga, P., Muñoz, A., Bozkurt, D., Alvarez-Garreton, C.Anthropocene and streamflow: Long-term perspective of streamflow variability and water rightsElementa: Science of the Anthropocene10.1525/elementa.340The socio-ecological sensitivity to water deficits makes Chile highly vulnerable to global change. New evidence of a multi-decadal drying trend and the impacts of a persistent drought that since 2010 has affected several regions of the country, reinforce the need for clear diagnoses of the hydro-climate changes in Chile. Based on the analysis of long-term records (50+ years) of precipitation and streamflow, we confirm a tendency toward a dryer condition in central-southern Chile (30–48°S). We describe the geographical and seasonal character of this trend, as well as the associated large-scale circulation pat- terns. When a large ensemble of climate model simulations is contrasted to observations, anthropogenic forcing appears as the leading factor of precipitation change. In addition to a drying trend driven by greenhouse gas forcing in all seasons, our results indicate that the Antarctic stratospheric ozone deple- tion has played a major role in the summer rainfall decline. Although average model results agree well with the drying trend’s seasonal character, the observed change magnitude is two to three times larger than that simulated, indicating a potential underestimation of future projections for this region. Under present-day carbon emission rates, the drying pathway in Chile will likely prevail during the next decades, although the summer signal should weaken as a result of the gradual ozone layer recovery. The trends and scenarios shown here pose substantial stress on Chilean society and its institutions, and call for urgent action regarding adaptation measures. is.1Thomson Reuters ISImulticentury variability, runoff variability, water governance, water rights, anthropocene, catchment, database, human rights, hydrological regime, planning legislation, regional climate, regulatory framework, streamflow, tributary, water resource, water use efficiency, chile, maule, maule river
Transversal2018Sen O.L., Ezber Y., Bozkurt D.Euro-Mediterranean climate variability in boreal winter: a potential role of the East Asian troughClimate Dynamics10.1007/s00382-018-4573-9Euro-Mediterranean climate variability has been associated mostly with the upstream atmospheric circulation and teleconnection patterns, the North Atlantic Oscillation and European blocking being the main ones. This study shows, for the first time, that the East Asian trough (EAT), a prominent circulation feature of the mid-troposphere in the downstream side, might exert a strong and significant role on the interannual variability of the Euro-Mediterranean climate during boreal winters. We performed empirical orthogonal function analysis on the regions of the EAT and Mediterranean trough (MedT), an important system modulating the climate of the region, to obtain the respective dominant modes of variability at 500-hPa geopotential heights. It appears that the leading modes, the intensity in the case of the EAT and the zonal displacement in the case of the MedT, are significantly correlated with each other (r = − 0.64, p < 0.001). Consequently, when the EAT is strong (weak), the MedT is observed in the west (east) of its climatological location resulting in a warmer (cooler) Middle East and northeastern Africa, a cooler (warmer) western Europe and northwestern Africa, and wetter (dryer) Italian, Balkan and Anatolian peninsulas. Given the fact that the EAT is also a key determinant of the East Asian winter climate, the identified mid-tropospheric link between East Asia and Mediterranean could help interpret some temperature and precipitation co-variability on the opposite sides of the Eurasian continent. We suggest that studies involving the Euro-Mediterranean climate should also consider the role of the EAT as it seems to be a potential driver of the year-to-year, perhaps longer-term, climate variability in the region. Reuters ISIcomposite analysis, eof analysis, interannual variability, precipitation, surface air temperature, air temperature, annual variation, atmospheric circulation, climate variation, precipitation (climatology), troposphere, winter, africa, anatolia, balkans, italian peninsula, mediterranean region, turkey
Agua y Extremos, Cambio de Uso de Suelo2019Chávez, R.O., Moreira-Munoz, A., Galleguillos, M., Olea, M., Aguayo, J., Latín, A., Aguilera-Betti, I., Muñoz, A. A., Manriquez, H.GIMMS NDVI time series reveal the extent, duration, and intensity of “blooming desert” events in the hyper-arid Atacama Desert, Northern ChileInternational Journal of Applied Earth Observation and Geoinformation10.1016/j.jag.2018.11.013The “blooming desert”, or the explosive development and flowering of ephemeral herbaceous and some woody desert species during years with abnormally high accumulated rainfall, is a spectacular biological phenomenon of the hyper-arid Atacama Desert (northern Chile) attracting botanists, ecologists, geo-scientists, and the general public from all over the world. However, the number of “blooming deserts”, their geographical distribution and spatio-temporal patterns have not been quantitatively assessed to date. Here, we used NDVI data from the Global Inventory Modeling and Mapping Studies (GIMMS) project to reconstruct the annual land surface phenology (LSP) of the Atacama Desert using a non-parametric statistical approach. From the reconstructed LSP, we detected the “blooming deserts” as positive NDVI anomalies and assessed three dimensions of the events: their temporal extent, intensity of “greening” and spatial extent. We identified 13 “blooming deserts” between 1981 and 2015, of which three (1997–98, 2002–03, and 2011) can be considered major events according to these metrics. The main event occurred in 2011, spanning 180 days between July and December 2011, and spread over 11,136 km 2 of Atacama dry plains. “Blooming deserts” in Atacama have been triggered by the accumulation of precipitation during a period of 2 to 12 months before and during the events. The proposed three-dimensional approach allowed us to characterize different types of “blooming deserts”: with longer episodes or larger spatial distribution or with different “greening” intensities. Its flexibility to reconstruct different LSP and detect anomalies makes this method a useful tool to study these rare phenomena in other deserts in the world also. Reuters ISIephemeral vegetation, extreme events, land surface phenology, npphen, precipitation variability, remote sensing, time series, desert, extreme event, land surface, numerical model, phenology, precipitation intensity, vegetation mapping, atacama desert, chile
Cambio de Uso de Suelo2018Fontúrbel F.E., Lara A., Lobos D., Little C.The cascade impacts of climate change could threaten key ecological interactionsEcosphere10.1002/ecs2.2485Climate change is triggering ecological responses all over the world as a result of frequent, prolonged droughts. It could also affect ecological interactions, particularly pollination and seed dispersal, which play a key role in plant reproduction. We used a tripartite interaction with a mistletoe, its pollinator and its disperser animals to gain insight into this issue. We studied flower and fruit production, and visitation rates during average (2012) and dry (2015) austral summers. Drought in our study area affected precipitation and soil water availability. Although pollinator visits did not significantly differ in these summers, during the dry summer flower and fruit production experienced an important decline, as did seed disperser visits. Also, mistletoe mortality increased from 12% in 2012 to 23% in 2015. This empirical evidence suggests that the cascade effects of climate change may indirectly be hindering ecological interactions in the Valdivian temperate rainforest ecosystem we studied. Long‐term research is essential to provide the knowledge necessary to understand how key ecological processes may be affected in a changing world. is.12Thomson Reuters ISIdromiciops gliroides, drought, sephanoides sephaniodes, soil moisture, temperate rainforests, tristerix corymbosus
Ciudades Resilientes2019Yang, M., Fleming, Z. L.Estimation of atmospheric total organic carbon (TOC) – paving the path towards carbon budget closureAtmospheric Chemistry and Physics10.5194/acp-19-459-2019The atmosphere contains a rich variety of reactive organic compounds, including gaseous volatile organic carbon (VOCs), carbonaceous aerosols, and other organic compounds at varying volatility. Here we present a novel and simple approach to measure atmospheric non-methane total organic carbon (TOC) based on catalytic oxidation of organics in bulk air to carbon dioxide. This method shows little sensitivity towards humidity and near 100% oxidation efficiencies for all VOCs tested. We estimate a best-case hourly precision of 8 ppbC during times of low ambient variability in carbon dioxide, methane, and carbon monoxide (CO). As proof of concept of this approach, we show measurements of TOCCCO during August–September 2016 from a coastal city in the southwest United Kingdom. TOCCCO was substantially elevated during the day on weekdays (occasionally over 2 ppm C) as a result of local anthropogenic activity. On weekends and holidays, with a mean (standard error) of 102 (8) ppb C, TOCCCO was lower and showed much less diurnal variability. TOCCCO was significantly lower when winds were coming off the Atlantic Ocean than when winds were coming off land if we exclude the weekday daytime. By subtracting the estimated CO from TOCCCO, we constrain the mean (uncertainty) TOC in Atlantic-dominated air masses to be around 23 ( 8) ppbC during this period. A proton-transfer-reaction mass spectrometer (PTR-MS) was deployed at the same time, detecting a large range of organic compounds (oxygenated VOCs, biogenic VOCs, aromatics, dimethyl sulfide). The total speciated VOCs from the PTRMS, denoted here as Sum(VOC), amounted to a mean (uncertainty) of 12 ( 3) ppbC in marine air. Possible contributions from a number of known organic compounds present in marine air that were not detected by the PTR-MS are assessed within the context of the TOC budget. Finally, we note that the use of a short, heated sample tube can improve the transmission of organics to the analyzer, while operating our system alternately with and without a particle filter should enable a better separation of semi-volatile and particulate organics from the VOCs within the TOC budget. Future concurrent measurements of TOC, CO, and a more comprehensive range of speciated VOCs would enable a better characterization and understanding of the atmospheric organic carbon budget. is.1Thomson Reuters ISIaerosol, atmospheric chemistry, carbon budget, estimation method, human activity, oxidation, total organic carbon, volatile organic compound, united kingdom
Ciudades Resilientes2019Pfeiffer, M., Latorre, C., Gayo, E., Amundson, R.Rare calcium chloride–rich soil and implications for the existence of liquid water in a hyperarid environmentGeology10.1130/G45642.1We discovered permanently hydrated CaCl2-rich soils in Earth’s driest region, the Atacama Desert. The soils contain up to ∼15% CaCl2. X-ray diffraction indicates the rare minerals sinjarite, schoenite, and tachyhydrite. When water is added, the CaCl2 crust immediately turns white due to an apparent mineralogical phase change from sinjarite to a brine. The surfaces are nearly continuously wet due to the salt’s hygroscopicity. The Ca-enriched soils occur in rare exposures, possibly from shallow groundwater. Unlike the surface of adjacent abundant halite crusts, the CaCl2 outcrops remain continuously wet, with up to 12% water under modern, and essentially rainless, climatic conditions. The wet surface stabilizes the land surface and acts as a dust trap. The sediment began accumulating at ca. 14 ka, contains trace quantities of organic carbon, and has total nitrogen that isotopically reflects significant biologically mediated gaseous losses. These deliquescent salts are unique habitats for life within the climatic limits of life on Earth, and are a potential analog for transient liquid-water sources for microorganisms in Martian soils. 47 is.2Thomson Reuters ISIcalcium chloride, groundwater, organic carbon, sodium chloride, atacama desert, climatic conditions, land surface, liquid water, martian soils, shallow groundwater, total nitrogen, wet surfaces, soils, arid environment, climate conditions, mineral, mineralogy, soil water, chile
Cambio de Uso de Suelo2019Merino-Campos, V., De Pol-Holz, R., Southon, J., Latorre, C., Collado-Fabbri, S.Marine Radiocarbon Reservoir Age Along the Chilean Continental MarginRadiocarbon10.1017/RDC.2018.81We present 37 new radiocarbon (14C) measurements from mollusk shells fragments sampled along the Chilean continental margin and stored in museum collections with known calendar age. These measurements were used to estimate the modern pre-bomb regional marine 14C age deviations from the global ocean reservoir (∆R). Together with previously published data, we calculated regional mean ∆R values for five oceanographic macro regions along the coast plus one for a mid-latitude open ocean setting. In general, upwelling regions north of 42ºS show consistent although sometimes highly variable ∆R values with regional averages ranging from 141 to 196 14C yr, whereas the mid-latitude open ocean location of the Juan Fernández archipelago and the southern Patagonian region show minor, ∆R of 40±38 14C yr, and 52±47 14C yr respectively. We attribute the alongshore decreasing pattern toward higher latitudes to the main oceanographic features along the Chilean coast such as perennial coastal upwelling in northern zone, seasonally variable upwelling at the central part and the large freshwater influence upon the southern 61 is.1Thomson Reuters ISIchile, radiocarbon ams dating, reservoir correction, reservoir effect, upwelling, accelerator mass spectrometry, age, carbon isotope, continental margin, global ocean, mollusc, museum, radiocarbon dating, reservoir, shell, juan fernandez islands, patagonia, filicophyta
Cambio de Uso de Suelo2019Rey Benayas, J. M., Altamirano, A., Miranda, A., Catalán, G., Prado, M., Lisón, F., Bullock, J. M.Landscape restoration in a mixed agricultural-forest catchment: Planning a buffer strip and hedgerow network in a Chilean biodiversity hotspotAmbio10.1007/s13280-019-01149-2Guidance for large-scale restoration of natural or semi-natural linear vegetation elements that takes into account the need to maintain human livelihoods such as farming is often lacking. Focusing on a Chilean biodiversity hotspot, we assessed the landscape in terms of existing woody vegetation elements and proposed a buffer strip and hedgerow network. We used spatial analysis based on Google Earth imagery and QGIS, field surveys, seven guidelines linked to prioritization criteria and seedling availability in the region's nurseries, and estimated the budget for implementing the proposed network. The target landscapes require restoring 0.89 ha km-2 of woody buffer strips to meet Chilean law; 1.4 ha km-2 of new hedgerows is also proposed. The cost of restoration in this landscape is estimated in ca. USD 6900 per planted ha of buffer strips and hedgerows. Financial incentives, education, and professional training of farmers are identified as key issues to implement the suggested restoration actions. pressThomson Reuters ISIconnectivity, conservation, ecosystem services, farmland, land-sharing, living fences, agricultural land, agroforestry, buffer zone, catchment, ecosystem service, environmental restoration, gis, hedgerow, prioritization, spatial analysis, vegetation structure, chile, agriculture, biodiversity, ecosystem, environmental protection, forest, human, conservation of natural resources, forests, humans
Ciudades Resilientes; Gobernanza e Interfaz Ciencia y Política2019Billi, Marco; Blanco, Gustavo; Urquiza, AnahíWhat is the ‘Social’ in Climate Change Research? A Case Study on Scientific Representations from ChileMinerva10.1007/s11024-019-09369-2Over the last few decades climate change has been gaining importance%%%in international scientifc and political debates. However, the social sciences, especially in Latin America, have only lately become interested in the subject and their%%%approach is still vague. Scientifc understanding of global environmental change and%%%the process of designing public policies to face them are characterized by their complexity as well as by epistemic and normative uncertainties. This makes it necessary%%%to problematize the way in which research eforts understand ‘the social’ of climate%%%change. How do ‘the climate’ and ‘the social’ interpenetrate as scientifc objects?%%%What does the resulting feld look like? Is the combination capable of promoting refexivity and collaboration on the issue, or does it merely become dispersed%%%with difuse boundaries? Our paper seeks to answer these and other related questions using Chile as a case study and examining peer-reviewed scientifc research%%%on the topic. By combining in-depth qualitative content analysis of each paper with a statistical meta-analysis, we were able to: characterize the key content and forms%%%of such literature; identify divisions and patterns within it; and, discuss some factors%%%and trends that may help explain these. We conclude that the literature displays two%%%competing trends: while it is inclined to become fragmented beyond the scope of the%%%‘mitigation’ black box, it also tends to cluster along the lines of methodological distinctions traditionally contested within the social sciences. This, in turn, highlights%%%the persistence of disciplinary divisions within an allegedly interdisciplinary feld. is.Thomson Reuters ISIchile, climate change, literature meta-analysis, scientific black boxes, scientific representations, social dimensions
Cambio de Uso de Suelo2019Manuschevich, Daniela; Sarricolea, Pablo; Galleguillos, MauricioIntegrating socio-ecological dynamics into land use policy outcomes: A spatial scenario approach for native forest conservation in south-central ChileLand Use Policy10.1016/j.landusepol.2019.01.042Chile is one of the first documented nations to undergo a forest transition dominated by tree farm expansion. Scenario modelling can inform the possible outcomes of forest conservation policies, especially when the scenarios are rooted in the political dynamics that shaped the current legislation. In Chile, tree farms of non-native Radiata Pine and Eucalyptus provide a fast return on investment. Today, fast-growing plantations compete for land area with forest conservation, putting the unique bundle of ecosystem services provided by the latter at risk. Based on a previous political analysis, we propose scenarios projected to 2030 to compare a business-as-usual scenario with A) a conservation scenario based on strict land use restrictions B) an optimistic conservation scenario; C) an unrestricted industrial land use scenario; and D) a restricted industrial land use scenario. The scenarios differ in terms of the implemented policy instruments and the land area required for each land use. We compared these scenarios in terms of carbon stock, control of erosion and wood production, all of which are relevant in the current Chilean political debate. A conservation scenario (A), that combines incentives and restrictions, would imply the largest increase in native forest and regulation services, namely carbon stock and erosion control. In contrast, an unrestricted industrial land use scenario (C) leads to the worst outcomes in terms of erosion compared to a business-as-usual scenario. This study seeks to link political and economic processes underpinning land use change to environmental outcomes, while contributing to the larger discussion on forest policy, forest transitions and environmental outcomes. © 2019 is.Thomson Reuters ISIdyna-clue, forest transitions, invest, socio-ecological, tree farms, conservation planning, ecosystem service, forest management, forestry policy, land use planning, nature conservation, policy implementation, policy making, spatial analysis, chile, eucalyptus, radiata
Gobernanza e Interfaz Ciencia y Política2019Ortega, Cristina; Vargas, Gabriel; Rojas, Maisa; Rutllant, José A.; Muñoz, Práxedes; Lange, Carina B.; Pantoja, Silvio; Dezileau, Laurent; Ortlieb, LucExtreme ENSO-driven torrential rainfalls at the southern edge of the Atacama Desert during the Late Holocene and their projection into the 21th centuryGlobal and Planetary Change10.1016/j.gloplacha.2019.02.011Extreme precipitation events and multi-annual droughts, especially in arid to semi-arid subtropical regions, are among the most critical El Niño Southern Oscillation (ENSO) and global climate change impacts. Here, we assess the variability of torrential rainfall during the Late Holocene and its projection into the 21st century at the southern edge of the hyperarid Atacama Desert. The analysis of historical data since the beginning of the 20th century reveals that most (76.5%) alluvial disasters in the southern Atacama Desert (26–30°S) have resulted from extreme rainfall events occurring between March and September under El Niño conditions, and more frequently during the warm phase of the Pacific Decadal Oscillation. Particular rainfall events under these ocean-climate conditions are associated with the convective phase of the Madden-Julian Oscillation (MJO) near the central-equatorial Pacific, resulting in warmer sea surface temperature (SST) there and in the triggering of persistent/intense Pacific South America (PSA) tropical-extratropical teleconnection patterns which result in blocking of the westerly flow at high latitudes and the subsequent deviation of storm tracks towards central-northern Chile. On a longer timescale, marine sediments from Tongoy Bay (30°S) reveal an increasing trend of stronger runoff by torrential coastal rain since ca. 3500 cal yr BP and even stronger heavy rainfall since ca. 1700 cal yr BP. Highly variable coastal sea surface temperatures in the same time span deduced from the sedimentary record can be explained by intensified southerly winds in connection with stronger alongshore pressure gradients and reduced coastal low-cloud cover. Both storm intensification and increased intensity of upwelling-favorable winds point to a variable climate conditioned by strengthened interannual ENSO and interdecadal ENSO-like variability during the Late Holocene. Climate projections from the Coupled Model Intercomparison Project Phase 5 (CMIP5) indicate a reduction in annual precipitation of 15–30% during the current century, together with an intensification of the storms, such as the alluvial disaster on March 25, 2015 in Atacama. © 2019 Elsevier B.V. is.Thomson Reuters ISIcmip5, el niño southern oscillation, extreme rainfall events, pacific decadal oscillation, pacific south america teleconnection pattern, southern edge of atacama desert, atmospheric pressure, atmospheric temperature, climate change, disasters, landforms, oceanography, oscillating flow, rain, storms, submarine geology, submarine geophysics, surface properties, surface waters, tropics, atacama desert, extreme rainfall, southern oscillation, teleconnection patterns, climate models, cloud cover, cmip, drought, el nino-southern oscillation, global climate, holocene, pressure gradient, rainfall, runoff, sea surface temperature, snowstorm, teleconnection, torrent, twenty first century, chile, coquimbo, pacific ocean, pacific ocean (south), tongoy bay
Zonas Costeras2019Yevenes, Mariela A.; Lagos, Nelson A.; Farías, Laura; Vargas, Cristian A.Greenhouse gases, nutrients and the carbonate system in the Reloncaví Fjord (Northern Chilean Patagonia): Implications on aquaculture of the mussel, Mytilus chilensis, during an episodic volcanic eruptionScience of The Total Environment10.1016/j.scitotenv.2019.03.037This study investigates the immediate and mid-term effects of the biogeochemical variables input into the Reloncaví fjord (41°40′S; 72°23′O) as a result of the eruption of Calbuco volcano. Reloncaví is an estuarine system supporting one of the largest mussels farming production within Northern Chilean-Patagonia. Field-surveys were conducted immediately after the volcanic eruption (23–30 April 2015), one month (May 2015), and five months posterior to the event (September 2015). Water samples were collected from three stations along the fjord to determine greenhouse gases [GHG: methane (CH 4 ), nitrous oxide (N 2 O)], nutrients [NO 3 − , NO 2 − , PO 4 3− , Si(OH) 4 , sulphate (SO 4 2− )], and carbonate systems parameters [total pH (pHT), temperature, salinity, dissolved oxygen (O 2 ), and total alkalinity (AT)]. Additionally, the impact of physicochemical changes in the water column on juveniles of the produced Chilean blue mussel, Mytilus chilensis, was also studied. Following the eruption, a large phytoplankton bloom led to an increase in pH T , due to the uptake of dissolved-inorganic carbon in photic waters, potentially associated with the runoff of continental soil covered in volcanic ash. Indeed, high surface SO 4 2− and GHG were observed to be associated with river discharges. No direct evidence of the eruption was observed within the carbonate system. Notwithstanding, a vertical pattern was observed, with an undersaturation of aragonite (Ω Ar < 1) both in brackish surface (<3 m) and deep waters (>10 m), and saturated values in subsurface waters (3 to 7 m). Simultaneously, juvenile mussel shells showed maximized length and weight at 4 m depth. Results suggest a localized impact of the volcanic eruption on surface GHG, nutrients and short-term effects on the carbonate system. Optimal conditions for mussel calcification were identified within a subsurface refuge in the fjord. These specific attributes can be integrated into adaptation strategies by the mussel aquaculture industry to confront ocean acidification and changing runoff conditions. © 2019 Elsevier B.V. is.Thomson Reuters ISIcarbonates system, chilean patagonian fjord, mussel farming, nutrients, volcanic event, alkalinity, aquaculture, biomineralization, carbonation, dissolved oxygen, greenhouse gases, molluscs, nitrogen oxides, runoff, sulfur compounds, surface discharges, adaptation strategies, aquaculture industry, dissolved inorganic carbon, ocean acidifications, physico-chemical changes, volcanoes, calcium carbonate, carbonic acid, methane, nitrous oxide, sulfate, surface water, sea water, adaptive management, biogeochemical cycle, carbonate system, chemical oceanography, greenhouse gas, mussel culture, nutrient, ocean acidification, volcanic eruption, article, chilean, estuary, mussel, mytilus chilensis, nonhuman, ph, physical chemistry, phytoplankton, priority journal, salinity, temperature, volcanic ash, volcano, water sampling, analysis, animal, body constitution, chemistry, chile, environmental monitoring, mytilus, physiology, season, calbuco volcano, los lagos, reloncavi fjord, mytilus edulis, animals, carbonates, seasons, seawater, volcanic eruptions
Ciudades Resilientes; Zonas Costeras2019Rowe, Penny M.; Cordero, Raul R.; Warren, Stephen G.; Stewart, Emily; Doherty, Sarah J.; Pankow, Alec; Schrempf, Michael; Casassa, Gino; Carrasco, Jorge; Pizarro, Jaime; MacDonell, Shelley; Damiani, Alessandro; Lambert, Fabrice; Rondanelli, Roberto; Huneeus, Nicolas; Fernandoy, Francisco; Neshyba, StevenBlack carbon and other light-absorbing impurities in snow in the Chilean AndesScientific Reports10.1038/s41598-019-39312-0Vertical profiles of black carbon (BC) and other light-absorbing impurities were measured in seasonal snow and permanent snowfields in the Chilean Andes during Austral winters 2015 and 2016, at 22 sites between latitudes 18°S and 41°S. The samples were analyzed for spectrally-resolved visible light absorption. For surface snow, the average mass mixing ratio of BC was 15 ng/g in northern Chile (18–33°S), 28 ng/g near Santiago (a major city near latitude 33°S, where urban pollution plays a significant role), and 13 ng/g in southern Chile (33–41°S). The regional average vertically-integrated loading of BC was 207 µg/m 2 in the north, 780 µg/m 2 near Santiago, and 2500 µg/m 2 in the south, where the snow season was longer and the snow was deeper. For samples collected at locations where there had been no new snowfall for a week or more, the BC concentration in surface snow was high (~10–100 ng/g) and the sub-surface snow was comparatively clean, indicating the dominance of dry deposition of BC. Mean albedo reductions due to light-absorbing impurities were 0.0150, 0.0160, and 0.0077 for snow grain radii of 100 µm for northern Chile, the region near Santiago, and southern Chile; respective mean radiative forcings for the winter months were 2.8, 1.4, and 0.6 W/m 2 . In northern Chile, our measurements indicate that light-absorption by impurities in snow was dominated by dust rather than BC. © 2019, The Author(s). is.1.0Thomson Reuters ISI-
Agua y Extremos; Zonas Costeras; Transversal2019Rondanelli, R.; Hatchett, B.; Rutllant, J.; Bozkurt, D.; Garreaud, R.Strongest MJO on Record Triggers Extreme Atacama Rainfall and Warmth in AntarcticaGeophysical Research Letters10.1029/2018GL081475Tropical perturbations have been shown theoretically and observationally to excite long range atmospheric responses in the form of Rossby wave teleconnections that result from the equator to pole gradient of planetary vorticity. An extreme teleconnection event occurred during March 2015 in the Southeastern Pacific. As a result, extreme high temperatures were observed in Southwestern South America and the Antarctic Peninsula simultaneously with an extreme rainfall and flood event in the hyperarid Atacama desert.%%%%%%We show that the origin of these seemingly disconnected extreme events can be traced to a Rossby wave response to the strongest Madden‐Julian Oscillation (MJO) on record in the tropical central Pacific. A barotropic wavenumber 3 to 4 perturbation with group velocity between 15 to 30 m/s is consistent with the trajectory and timing followed by the upper level anomalies radiating away from the tropics after the MJO episode. is.Thomson Reuters ISIantarctica, atmospheric rivers, climate dynamics, extremes, flooding, rossby waves, flood control, floods, mechanical waves, oil well flooding, rain, tropics, antarctic peninsula, atmospheric response, madden-julian oscillation, rossby wave, rossby wave response, climatology, air-sea interaction, barotropic wave, climate change, extreme event, flood, high temperature, rainfall, teleconnection, wave velocity, atacama desert, chile, pacific ocean, pacific ocean (central), pacific ocean (southeast), south america, west antarctica
Cambio de Uso de Suelo2019Soto, L.; Galleguillos, M.; Seguel, O.; Sotomayor, B.; Lara, A.Assessment of soil physical properties' statuses under different land covers within a landscape dominated by exotic industrial tree plantations in south-central ChileJournal of Soil and Water Conservation10.2489/jswc.74.1.12Land use and land cover changes (LULCC) within a highly anthropized Mediterranean landscape dominated by industrial tree plantation leads to degradation of soil physical properties. This process has been more intense in the coastal range of south-central%%%Chile due to its soils, which are highly susceptible to erosion, combined with a long history of intensive land use changes during the last century, transitioning from native forest (NF) to agriculture and the more recent establishment of Pinus radiata and Eucalyptus spp. exotic tree plantations. In this context, the aim of this study was to assess the statuses of soil physical properties over different land cover situations. Historical land cover maps were determined via supervised classifications using the maximum likelihood classifier applied to satellite imagery. Five land use and land cover categories (LULC) were defined according to main land cover transitions associated with active and abandoned forestry operations that have been reported in the region: NF, pine plantation (P), eucalyptus plantation (Eu), early successional (E-S), and secondary successional (S-S). Successional stages were generated using change detection statistics considering changes between 2001 and 2014 maps. Soil samples were collected at%%%three depths in 39 plots that describe the five LULC. High clay contents were found in all%%%the LULC except Eu and P. These sites have shown more signs of degradation, with lower%%%organic matter (SOM) and macropores and higher shear strength (ShS). Soil organic matter was consistent with litter contribution and quality, establishing lower bulk density (Db) for NF and S-S and higher values for Eu and E-S. ShS and dispersion rate (DR) exhibit a correlation with SOM with lower ShS and higher DR when SOM increased. Relevant differences were identified for structural stability index (SSI) between LULC depending on soil physical quality, besides a positive correlation with SOM. Those results show the need to generate appropriate conditions of vegetation cover in order to recover soils subjected to current forestry management of industrial plantations. is.1.0Thomson Reuters ISIdegraded landscape, forestry industry, land use and land cover changes (lulcc), mediterranean ecosystem, soil properties, anthropogenic effect, bulk density, forestry practice, land cover, land degradation, land use change, mediterranean environment, plantation forestry, pore space, shear strength, chile, eucalyptus, pinus radiata
Cambio de Uso de Suelo2019Tejo, Camila F.; Fontúrbel, Francisco E.A vertical forest within the forest: millenary trees from the Valdivian rainforest as biodiversity hubsEcology10.1002/ecy.2584Alerce (Fitzroya cupressoides (Molina) I.M. Johnst., Cupressaceae), known as Lahuan by the Mapuche people, is the most iconic endemic conifer of southern Chile and adjacent Argentina (Fig. 1). It can reach monumental dimensions (up to 5 m in diameter and over 50 m in height) and has remarkable longevity (Lara et al. 1999, Clement et al. 2001, Donoso‐Zeggers 2006, Urrutia‐Jalabert et al. 2015). The oldest alerce tree recorded is over 3,600 years old, making this species the second longest‐lived tree in the world after the North American Bristlecone pine (Pinus longaeva D. K. Bailey) (Lara and Villalba 1993). is.Thomson Reuters ISIanthropogenic effect, biodiversity, biota, coniferous tree, endangered species, forest canopy, forest ecosystem, rainforest, red list, temperate forest, tree, argentina, chile, los rios chile, valdivia, forest, rain forest, tropic climate, forests, trees, tropical climate
Gobernanza e Interfaz Ciencia y Política2019Tobasura Morales, David; Gurri, Francisco D.; Blanco Wells, Gustavo; Schmook, BirgitEnredando bosques y comunidades: territorialización de REDD+ en el ejido Felipe Carrillo Puerto, MéxicoCuadernos de Desarrollo Rural10.11144/Javeriana.cdr15-81.ebctAnalizamos los efectos discursivos y relacionales del proyecto piloto Reducción de Emisiones por Deforestación y Degradación (REDD+) en unidades domésticas con y sin derechos de acceso a la tierra en el ejido Felipe Carrillo Puerto, Quintana Roo. A partir de encuestas y entrevistas semiestructuradas, identificamos dispositivos que favorecen la adopción de prácticas de conservación por parte de los ejidatarios propietarios de la tierra, pero que restringen el manejo forestal tradicional. Estas dinámicas generan cambios en las estrategias de subsistencia de las unidades domésticas y limitan la participación y distribución de beneficios a mujeres, jóvenes y avecindados sin propiedad de la tierra. is.81.0Thomson Reuters ISIadaptative strategies, environmental policies, redd+, use and access to forests
Agua y Extremos; Cambio de Uso de Suelo2019Collins, James A.; Lamy, Frank; Kaiser, Jérôme; Ruggieri, Nicoletta; Henkel, Susann; De Pol‐Holz, Ricardo; Garreaud, René; Arz, Helge W.Centennial‐Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 YearsPaleoceanography and Paleoclimatology10.1029/2018PA003465Detailed temperature reconstructions over the past 2,000 years are important for contextualizing modern climate change. The midlatitude SE Pacific is a key region in this regard in terms of understanding the climatic linkages between the tropics and southern high latitudes. Multicentennial timescale temperature variability remains, however, poorly understood, due to a lack of long, high-temporal-resolution temperature records from this region and from the southern high latitudes in general. We present a unique alkenone sea surface temperature (SST) record from 44°S on the southern Chilean margin in the SE Pacific spanning the last 2,300 years at decadal resolution. The record displays relatively large changes including a cooling transition from 14 to 12.5 °C between 1,100 and 600 cal yr BP, in line with other Chile margin SST records and coeval with Antarctic cooling. This cooling is attributable to reduced Southern Ocean deep convection, driven by a late Holocene sea-ice increase in the Weddell Sea associated with increased El-Niño Southern Oscillation variability. Superimposed on the late Holocene cooling, we observe multicentennial timescale SST variability, including relatively cool SSTs (12.5 °C) from 950 to 500 cal yr BP, corresponding to the Medieval Climate Anomaly, and warmer SSTs (13 °C) from 500 to 200 cal yr BP, corresponding to the Little Ice Age. These oscillations may reflect either multicentennial internal variability of the Southern Ocean deep convection and/or multicentennial variability in the phasing of El-Niño Southern Oscillation and Southern Annular Mode events. ©2019. American Geophysical Union. All Rights Reserved. is.Thomson Reuters ISIclimate change, convection, cooling, el nino-southern oscillation, holocene, medieval warm period, reconstruction, sea ice, sea surface temperature, pacific ocean, pacific ocean (southeast), southern ocean, weddell sea
Gobernanza e Interfaz Ciencia y Política2019Seth, Anji; Giannini, Alessandra; Rojas, Maisa; Rauscher, Sara A.; Bordoni, Simona; Singh, Deepti; Camargo, Suzana J.Monsoon Responses to Climate Changes—Connecting Past, Present and FutureCurrent Climate Change Reports10.1007/s40641-019-00125-yPurpose of Review: Knowledge of how monsoons will respond to external forcings through the twenty-first century has been confounded by incomplete theories of tropical climate and insufficient representation in climate models. This review highlights recent insights from past warm climates and historical trends that can inform our understanding of monsoon evolution in the context of an emerging energetic framework. Recent Findings: Projections consistent with paleoclimate evidence and theory indicate expanded/wetter monsoons in Africa and Asia, with continued uncertainty in the Americas. Twentieth century observations are not congruent with expectations of monsoon responses to radiative forcing from greenhouse gases, due to the confounding effect of aerosols. Lines of evidence from warm climate analogues indicate that while monsoons respond in globally coherent and predictable ways to orbital forcing and inter-hemispheric thermal gradients, there are differences in response to these forcings and also between land and ocean. Summary: Further understanding of monsoon responses to climate change will require refinement of the energetic framework to incorporate zonal asymmetries and the use of model hierarchies. © 2019, Springer Nature Switzerland AG. is.Thomson Reuters ISIclimate changes, global warming, monsoons, paleomonsoons
Cambio de Uso de Suelo2019Altamirano, Adison; Miranda, Alejandro; Meli, Paula; Dehennin, Joris; Muys, Bart; Prado, Marco; Catalán, Germán; Smith-Ramírez, Cecilia; Bustamante-Sánchez, Marcela; Lisón, Fulgencio; María Rey-Benayas, JoséSpatial congruence among indicators of recovery completeness in a Mediterranean forest landscape: Implications for planning large-scale restorationEcological Indicators10.1016/j.ecolind.2019.03.046Natural regeneration has been proposed as a cost-effective forest restoration approach for both small and largescale initiatives. However, attributes for assessing the success of forest restoration through natural regeneration may vary among them in spatial patterns depending on the scale of analysis and on environmental gradients. Here we analysed the spatial patterns of recovery completeness (i.e. how similar attributes in restored forests are to the same attributes in reference forests) in response to environmental factors in a Mediterranean forest landscape of Central Chile. We evaluated (1) forest recovery completeness using basal area (BA), quadratic mean diameter (QMD), adult species density (ASD), adult species richness (ASR), and seedling species richness (SSR); (2) the spatial congruence of recovery completeness estimated by each of these indicators; and (3) the environmental factors potentially shaping these spatial patterns. We used field measurements and geospatial information sources to quantify and predict indicator responses by fitting boosted regression tree models. To assess the spatial congruence of predictions we overlaid high-level recovery completeness values for all indicators. Overall recovery completeness in the study area was 72.7%, suggesting positive prospects for attaining fully restored forests. Recovery completeness had a resulted higher for diversity (92.3%−99.6%) than structural forest attributes (33.5%−76.9%); however, spatial congruence among recovery indicators was low due to the uneven spatial responses of each indicator. The maximum potential spatial congruence was<10%, and was predicted only by two environmental variables (soil bulk density and slope). Our results suggest that low spatial congruence among forest recovery indicators may hinder the monitoring of restoration at large scales. The implications of such divergence in defining restoration success can be enormous given the current global challenge of forest restoration. Although our research was tested in a threatened region of global importance, our results may have wider significance for restoration planning providing cautionary notes and recommendations for the appropriate use of forest recovery indicators when monitoring large-scale restoration projects. is.Thomson Reuters ISIboosted regression tree, landscape forest restoration, natural regeneration, restoration indicator, vegetation recovery, cost effectiveness, recovery, reforestation, restoration, boosted regression trees, environmental gradient, environmental variables, forest restoration, geo-spatial informations, quadratic mean diameter, conservation, basal area, diameter, forest ecosystem, mediterranean environment, plantation, regeneration, restoration ecology, seedling emergence, spatial analysis, species richness, chile
Ciudades Resilientes; Gobernanza e Interfaz Ciencia y Política2019Rojas, Maisa; Lambert, Fabrice; Ramirez-Villegas, Julian; Challinor, Andrew J.Emergence of robust precipitation changes across crop production areas in the 21st centuryProceedings of the National Academy of Sciences10.1073/pnas.1811463116A warming climate will affect regional precipitation and hence food supply. However, only a few regions around the world are currently undergoing precipitation changes that can be attributed to climate change. Knowing when such changes are projected to emerge outside natural variability—the time of emergence (TOE)—is critical for taking effective adaptation measures. Using ensemble climate projections, we determine the TOE of regional precipitation changes globally and in particular for the growing areas of four major crops. We find relatively early (<2040) emergence of precipitation trends for all four crops. Reduced (increased) precipitation trends encompass 1–14% (3–31%) of global production of maize, wheat, rice, and soybean. Comparing results for RCP8.5 and RCP2.6 clearly shows that emissions compatible with the Paris Agreement result in far less cropped land experiencing novel climates. However, the existence of a TOE, even under the lowest emission scenario, and a small probability for early emergence emphasize the urgent need for adaptation measures. We also show how both the urgency of adaptation and the extent of mitigation vary geographically. is.14.0Thomson Reuters ISIagriculture, climate change, cmip5, natural variability, precipitation, article, crop production, france, maize, nonhuman, probability, rice, soybean, wheat, adaptation, biological model, crop, growth, development and aging, adaptation, physiological, crops, agricultural, models, biological
Cambio de Uso de Suelo2019Moreno, Karen; Bostelmann, Juan Enrique; Macías, Cintia; Navarro-Harris, Ximena; De Pol-Holz, Ricardo; Pino, MarioA late Pleistocene human footprint from the Pilauco archaeological site, northern Patagonia, ChilePLOS ONE10.1371/journal.pone.0213572The present study describes the discovery of a singular sedimentary structure corresponding to an ichnite that was excavated at the paleo-archaeological site Pilauco (Osorno, Chile). The trace fossil is associated with megafauna bones, plant material and unifacial lithic tools. Here we present a detailed analysis of the Pilauco ichnite and associated sedimentary structures, as well as new radiocarbon data. The ichnological analysis confidently assigns the trace to the ichnospecies Hominipes modernus—a hominoid footprint usually related to Homo sapiens. Some particular characteristics of the Pilauco trace include an elongated distal hallux, lateral digit impressions obliterated by the collapsed sediment, and sediment lumps inside and around the trace. In order to evaluate the origin of the ichnite, trackmaking experiments are performed on re-hydrated fossil bed sediments. The results demonstrate that a human agent could easily generate a footprint morphology equivalent to the sedimentary structure when walking on a saturated substrate. Based on the evidence, we conclude that the trackmaker might well have been a bare-footed adult human. This finding, along with the presence of lithic artifacts in the same sedimentary levels, might represent further evidence for a pre-Clovis South American colonization of northern Patagonia, as originally proposed for the nearby Monte Verde site. is.4.0Thomson Reuters ISIcarbon 14, adult, ape, article, artifact, chile, demography, digit (body part), foot, fossil, hallux, human, morphology, radiometric dating, sedimentology, stratigraphy, walking speed, animal, archeology, hominid, sediment, animals, archaeology, fossils, geologic sediments, hominidae, humans
Zonas Costeras2019Bange, Hermann W.; Arévalo-Martínez, Damian L.; de la Paz, Mercedes; Farías, Laura; Kaiser, Jan; Kock, Annette; Law, Cliff S.; Rees, Andrew P.; Rehder, Gregor; Tortell, Philippe D.; Upstill-Goddard, Robert C.; Wilson, Samuel T.A Harmonized Nitrous Oxide (N2O) Ocean Observation Network for the 21st CenturyFrontiers in Marine Science10.3389/fmars.2019.00157Nitrous oxide (N2O) is an important atmospheric trace gas involved in tropospheric warming and stratospheric ozone depletion. Estimates of the global ocean contribution to N2O emissions average 21% (range: 10 to 53%). Ongoing environmental changes such as warming, deoxygenation and acidification are affecting oceanic N2O cycling and emissions to the atmosphere. International activities over the last decades aimed at improving estimates of global N2O emissions, including (i) the MarinE MethanE and NiTrous Oxide database (MEMENTO) for archiving of quality-controlled data, and (ii) a recent large-scale inter-laboratory comparison by Working Group 143 of the Scientific Committee on Ocean Research (SCOR). To reduce uncertainties in oceanic N2O emission estimates and to characterize the spatial and temporal variability in N2O distributions in a changing ocean, we propose the establishment of a harmonized N2O Observation Network (N2O-ON) combining discrete and continuous data from various platforms. The network will integrate observations obtained by calibrated techniques, using time series measurements at fixed stations and repeated hydrographic sections on voluntary observing ships and research vessels. In addition to exploiting existing oceanographic infrastructure, we propose the establishment of central calibration facilities in selected international laboratories to improve accuracy, and ensure standardization and comparability of N2O measurements. Final data products will include a harmonized global N2O concentration and emission fields for use in model validation and projections of future oceanic N2O emissions, to inform the global research community and policy makers. is.Thomson Reuters ISIcalibration, nitrous oxide, observation network, oceanic distribution, oceanic emissions
Ciudades Resilientes2019Tully, Craig D.; Rech, Jason A.; Workman, T. Race; Santoro, Calogero M.; Capriles, José M.; Gayo, Eugenia M.; Latorre, ClaudioIn-stream wetland deposits, megadroughts, and cultural change in the northern Atacama Desert, ChileQuaternary Research10.1017/qua.2018.122A key concern regarding current and future climate change is the possibility of sustained droughts that can have profound impacts on societies. As such, multiple paleoclimatic proxies are needed to identify megadroughts, the synoptic climatology responsible for these droughts, and their impacts on past and future societies. In the hyperarid Atacama Desert of northern Chile, many streams are characterized by perennial flow and support dense in-stream wetlands. These streams possess sequences of wetland deposits as fluvial terraces that record past changes in the water table. We mapped and radiocarbon dated a well-preserved sequence of in-stream wetland deposits along a 4.3-km reach of the Río San Salvador in the Calama basin to determine the relationship between regional climate change and the incision of in-stream wetlands. The Río San Salvador supported dense wetlands from 11.1 to 9.8, 6.4 to 3.5, 2.8 to 1.3, and 1.0 to 0.5 ka and incised at the end of each of these intervals. Comparison with other in-stream wetland sequences in the Atacama Desert, and with regional paleoclimatic archives, indicates that in-stream wetlands responded similarly to climatic changes by incising during periods of extended drought at ~9.8, 3.5, 1.3, and 0.5 ka. is.1.0Thomson Reuters ISIatacama, chile, climate and cultural change, in-stream wetlands, megadroughts, deposits, drought, groundwater, wetlands, atacama desert , chile, climatic changes, cultural changes, regional climate changes, synoptic climatology, climate change, climate variation, climatology, cultural change, fluvial deposit, paleoclimate, wetland, atacama desert
Zonas Costeras2019Imfeld, Noemi; Barreto Schuler, Christian; Correa Marrou, Kris Milagros; Jacques‐Coper, Martín; Sedlmeier, Katrin; Gubler, Stefanie; Huerta, Adrian; Brönnimann, StefanSummertime precipitation deficits in the southern Peruvian highlands since 1964International Journal of Climatology10.1002/joc.6087Precipitation deficits remain a concern to the rural population in the southern Peru-vian highlands and knowledge about their occurrence is lacking because of scarcedata availability. For mountainous regions with sparse station networks, reanalysescan provide valuable information; however, known limitations in reproducing pre-cipitation are aggravated due to unresolved topographical effects. In this study, weassess in a first step the representation of precipitation during the rainy season(January–February–March) in seven reanalysis data sets in comparison to a newlygenerated gridded precipitation data set for Peru. In a second step, we assess sum-mer precipitation deficits in Peru during the second half of the 20th century.In the reanalyses data sets, we find biases strongly influenced by the topography ofthe models and low correlations for the rainy season. Thus, reanalyses do not solvethe problem of data scarcity for this region either. Furthermore, we confirm that ElNiño is not a sufficient stratification criterion for precipitation deficits during therainy season (JFM) in the southern Peruvian highlands. Based on observationalrecords and reanalyses, a considerable fraction of inter-annual variability of precipi-tation can be explained through upper-tropospheric zonal wind anomalies. Westerlywind anomalies, often related to the warming of the troposphere during an El Niñoevent, lead to dry conditions, but not all El Niño events produce these westerly windanomalies. Atmospheric simulations indicate differences between precipitation defi-cits in central Pacific and eastern Pacific El Niño flavours, which cannot beaddressed in observations due to reduced record length: Droughts in the southernPeruvian Andes during eastern Pacific El Niño events seem to be related to a stron-ger warming in the troposphere above the central Pacific ocean, whereas this is notthe case for droughts during central Pacific El Niño events. These results, however,need to be further corroborated by model studies and palaeoclimatological research. is.Thomson Reuters ISIdrought, enso, era-20cm, mountain, peru, rainfall, reanalysis, spi, rain, topography, troposphere, atmospheric simulations, interannual variability, precipitation deficits, topographical effects, population statistics, annual variation, atmospheric modeling, data assimilation, el nino-southern oscillation, mountain region, precipitation (climatology), summer
Gobernanza e Interfaz Ciencia y Política; Transversal2019Bravo, Claudio; Bozkurt, Deniz; Gonzalez-Reyes, Álvaro; Quincey, Duncan J.; Ross, Andrew N.; Farías-Barahona, David; Rojas, MaisaAssessing Snow Accumulation Patterns and Changes on the Patagonian IcefieldsFrontiers in Environmental Science10.3389/fenvs.2019.00030Recent evidence shows that most Patagonian glaciers are receding rapidly. Due to the lack of in situ long-term meteorological observations, the understanding of how glaciers are responding to changes in climate over this region is extremely limited, and uncertainties exist in the glacier surface mass balance model parameterizations. This precludes a robust assessment of glacier response to current and projected climate change. An issue of central concern is the accurate estimation of precipitation phase. In this work, we have assessed spatial and temporal patterns in snow accumulation in both the North Patagonia Icefield (NPI) and South Patagonia Icefield (SPI). We used a regional climate model, RegCM4.6 and four Phase Partitioning Methods (PPM) in addition to short-term snow accumulation observations using ultrasonic depth gauges (UDG). Snow accumulation shows that rates are higher on the west side relative to the east side for both icefields. The values depend on the PPM used and reach a mean difference of 1,500 mm w.e., with some areas reaching differences higher than 3,500 mm w.e. These differences could lead to divergent mass balance estimations depending on the scheme used to define the snow accumulation. Good agreement is found in comparing UDG observations with modeled data on the plateau area of the SPI during a short time period; however, there are important differences between rates of snow accumulation determined in this work and previous estimations using ice core data at annual scale. Significant positive trends are mainly present in the autumn season on the west side of the SPI, while on the east side, significant negative trends in autumn were observed. Overall, for the rest of the area and during other seasons, no significant changes can be determined. In addition, glaciers with positive and stable elevation and frontal changes determined by previous works are related to areas where snow accumulation has increased during the period 2000–2015. This suggests that increases in snow accumulation are attenuating the response of some Patagonian glaciers to warming in a regional context of overall glacier retreat. is.Thomson Reuters ISIglacier mass-balance, patagonian icefields, regional climate model, snow accumulation, snow trends
Ciudades Resilientes2019Santoro, Calogero M.; Gayo, Eugenia M.; Capriles, José M.; Rivadeneira, Marcelo M.; Herrera, Katherine A; Mandakovic, Valentina; Rallo, Mónica; Rech, Jason A.; Cases, Bárbara; Briones, Luis; Olguín, Laura; Valenzuela, Daniela; Borrero, Luis A.; Ugalde, Paula C.; Rothhammer, Francisco; Latorre, Claudio; Szpak, PaulFROM THE PACIFIC TO THE TROPICAL FORESTS: NETWORKS OF SOCIAL INTERACTION IN THE ATACAMA DESERT, LATE IN THE PLEISTOCENEChungará (Arica)10.4067/S0717-73562019005000602The social groups that initially inhabited the hyper arid core of the Atacama Desert of northern Chile during the late Pleistocene integrated a wide range of local, regional and supra regional goods and ideas for their social reproduction as suggested by the archaeological evidence contained in several open camps in Pampa del Tamarugal (PdT). Local resources for maintaining their every-day life, included stone raw material, wood, plant and animal fibers, game, and fresh water acquired within a radius of -30 km (ca. 1-2 days journey). At a regional scale, some goods were introduced from the Pacific coast (60-80 km to the west, ca. 3-4 days journey), including elongated rounded cobbles used as hammer stones in lithic production, and shells, especially from non-edible species of mollusks. From the Andes (ranging 80-150 km to the east, ca. 5-8 days of journey), they obtained camelid fiber, obsidian and a high-quality chalcedony, in addition to sharing knowledge on projectile point designs (Patapatane and Tuina type forms). Pieces of wood of a tropical forest tree species (Ceiba spp.) from the east Andean lowlands (600 km away, ca. 30 days of journey) were also brought to the PdT. While local goods were procured by the circulation of people within the PdT, the small number of foreign items would have been acquired through some sort of exchange networks that integrated dispersed local communities throughout several ecosystems. These networks may have been a key factor behind the success exhibited by these early hunter-gatherers in the hyper arid ecosystems of the Atacama Desert at the end of the Pleistocene. Different lines of archaeological evidence including open camps, workshop-quarries, lithic artifacts, archaeofaunal remains, plant and animal fibers and textiles, archaeobotanical remains, and paleoecological data show that people of the PdT managed a wide range of cultural items from the Pacific coast, the Andean highland and the tropical forest, that were integrated with resources gathered locally within the socio-cultural systems established by the end of the Pleistocene. These results are interpreted as material expressions of multi-scalar networking for resource management and other social material and immaterial requirements, which in other words, means that these people were actively connected to regional (coastal and highland), and supra-regional (trans-Andean) exchange networks from and out of the PdT. is.aheadThomson Reuters ISIandes, atacama desert, bosque tropical, costa del pacífico, desierto de atacama, local, pacific coast, redes de interacción locales, regional and pan-andean networks of interaction, regionales y pan-andinas, tropical forest
Ciudades Resilientes2019Alfonso-Durruty, Marta P.; Gayo, Eugenia M.; Standen, Vivien; Castro, Victoria; Latorre, Claudio; Santoro, Calogero M.; Valenzuela, DanielaDietary diverstiy in the Atacama desert during the Late intermediate period of northern ChileQuaternary Science Reviews10.1016/j.quascirev.2019.04.022The Pacific Ocean that flanks the hyperarid Atacama Desert of Northern Chile is one of the richest biomass producers around the world. Thus, it is considered a key factor for the subsistence of prehistoric societies (including mixed-economy groups), that inhabited its coastal ecosystems as well as the neighboring inland areas. This study assesses the Arica Culture groups' diet (Late Intermediate Period; 1000–1530 CE), through stable isotope (on bone-collagen; δ 13 C and δ 15 N)and dental pathology data. Seventy-seven (n = 77)individuals from two inland (LLU54 and AZ8)and one coastal (CAM8)archaeological sites were studied. Results show an important, but lower than predicted by earlier studies, contribution of marine resources in the diet of all three groups. Dental pathologies and stable isotopes indicate that these groups' diet varied in correlation with their distance to the Pacific Ocean as well as group and individual preferences. The results challenge the idea that Arica Culture groups depended heavily on marine resources for their subsistence. In contrast, this study shows both that the Arica Culture groups’ diet was diverse, and that the terrestrial resources consumed were mostly contributed by C 3 /CAM plants instead of maize. is.Thomson Reuters ISIatacama desert, dental pathologies, late intermediate period, stable isotopes, ecosystems, isotopes, landforms, marine biology, natural resources, pathology, archaeological site, coastal ecosystems, individual preference, intermediate periods, marine resources, terrestrial resources, oceanography, archaeology, biomass, marine resource, prehistoric, stable isotope, chile, pacific ocean, zea mays
Zonas Costeras2019Alarcón-Schumacher, Tomás; Guajardo-Leiva, Sergio; Antón, Josefa; Díez, BeatrizElucidating Viral Communities During a Phytoplankton Bloom on the West Antarctic PeninsulaFrontiers in Microbiology10.3389/fmicb.2019.01014In Antarctic coastal waters where nutrient limitations are low, viruses are expected to play a major role in the regulation of bloom events. Despite this, research in viral identification and dynamics is scarce, with limited information available for the Southern Ocean (SO). This study presents an integrative-omics approach, comparing variation in the viral and microbial active communities on two contrasting sample conditions from a diatom-dominated phytoplankton bloom occurring in Chile Bay in the West Antarctic Peninsula (WAP) in the summer of 2014. The known viral community, initially dominated by Myoviridae family (∼82% of the total assigned reads), changed to become dominated by Phycodnaviridae (∼90%), while viral activity was predominantly driven by dsDNA members of the Phycodnaviridae (∼50%) and diatom infecting ssRNA viruses (∼38%), becoming more significant as chlorophyll a increased. A genomic and phylogenetic characterization allowed the identification of a new viral lineage within the Myoviridae family. This new lineage of viruses infects Pseudoalteromonas and was dominant in the phage community. In addition, a new Phycodnavirus (PaV) was described, which is predicted to infect Phaeocystis antarctica, the main blooming haptophyte in the SO. This work was able to identify the changes in the main viral players during a bloom development and suggests that the changes observed in the virioplankton could be used as a model to understand the development and decay of blooms that occur throughout the WAP. © 2019 Alarcón-Schumacher, Guajardo-Leiva, Antón and Díez. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. is.Thomson Reuters ISIenvironmental genomics, phytoplankton blooms, southern ocean, viral ecology, viruses, capsid protein, chlorophyll a, dna polymerase, ribulosebisphosphate carboxylase, rna 16s, transcriptome, algal bloom, alteromonadales, antarctica, article, asfarviridae, bayes theorem, bootstrapping, chlorophyll content, cryptophyta, diatom, dna base composition, environmental factor, flavobacteriales, gammaproteobacteria, gene sequence, genetic correlation, genetic similarity, genome analysis, haptophyta, maximum likelihood method, metagenome, metagenomics, microbial community, monte carlo method, myoviridae, nonhuman, oxygen concentration, phycodnaviridae, phylogeny, population abundance, pseudoalteromonas phage pm2, quality control, rna sequence, rna virus, seasonal variation, single-stranded rna virus, siphoviridae, taxonomy, virus cell interaction, virus identification
Ciudades Resilientes2019Alfonso, Juan A.; Cordero, Raul R.; Rowe, Penny M.; Neshyba, Steven; Casassa, Gino; Carrasco, Jorge; MacDonell, Shelley; Lambert, Fabrice; Pizarro, Jaime; Fernandoy, Francisco; Feron, Sarah; Damiani, Alessandro; Llanillo, Pedro; Sepulveda, Edgardo; Jorquera, Jose; Garcia, Belkis; Carrera, Juan M.; Oyola, Pedro; Kang, Choong-MinElemental and Mineralogical Composition of the Western Andean Snow (18°S–41°S)Scientific Reports10.1038/s41598-019-44516-5The snowpack is an important source of water for many Andean communities. Because of its importance, elemental and mineralogical composition analysis of the Andean snow is a worthwhile effort. In this study, we conducted a chemical composition analysis (major and trace elements, mineralogy, and chemical enrichment) of surface snow sampled at 21 sites across a transect of about 2,500 km in the Chilean Andes (18–41°S). Our results enabled us to identify five depositional environments: (i) sites 1–3 (in the Atacama Desert, 18–26°S) with relatively high concentrations of metals, high abundance of quartz and low presence of arsenates, (ii) sites 4–8 (in northern Chile, 29–32°S) with relatively high abundance of quartz and low presence of metals and arsenates, (iii) sites 9–12 (in central Chile, 33–35°S) with anthropogenic enrichment of metals, relatively high values of quartz and low abundance of arsenates, (iv) sites 13–14 (also in central Chile, 35–37°S) with relatively high values of quartz and low presence of metals and arsenates, and v) sites 15–21 (in southern Chile, 37–41°S) with relatively high abundance of arsenates and low presence of metals and quartz. We found significant anthropogenic enrichment at sites close to Santiago (a major city of 6 million inhabitants) and in the Atacama Desert (that hosts several major copper mines). is.1Thomson Reuters ISI-
Cambio de Uso de Suelo2019Lopatin, Javier; Kattenborn, Teja; Galleguillos, Mauricio; Perez-Quezada, Jorge F.; Schmidtlein, SebastianUsing aboveground vegetation attributes as proxies for mapping peatland belowground carbon stocksRemote Sensing of Environment10.1016/j.rse.2019.111217Peatlands are key reservoirs of belowground carbon (C) and their monitoring is important to assess the rapid changes in the C cycle caused by climate change and direct anthropogenic impacts. Frequently, information of peatland area and vegetation type estimated by remote sensing has been used along with soil measurements and allometric functions to estimate belowground C stocks. Despite the accuracy of such approaches, there is still the need to find mappable proxies that enhance predictions with remote sensing data while reducing field and laboratory efforts. Therefore, we assessed the use of aboveground vegetation attributes as proxies to predict peatland belowground C stocks. First, the ecological relations between remotely detectable vegetation attributes (i.e. vegetation height, aboveground biomass, species richness and floristic composition of vascular plants) and belowground C stocks were obtained using structural equation modeling (SEM). SEM was formulated using expert knowledge and trained and validated using in-situ information. Second, the SEM latent vectors were spatially mapped using random forests regressions with UAV-based hyperspectral and structural information. Finally, this enabled us to map belowground C stocks using the SEM functions parameterized with the random forests derived maps. This SEM approach resulted in higher accuracies than a direct application of a purely data-driven random forests approach with UAV data, with improvements of r2 from 0.39 to 0.54, normalized RMSE from 31.33% to 20.24% and bias from −0.73 to 0.05. Our case study showed that: (1) vegetation height, species richness and aboveground biomass are good proxies to map peatland belowground C stocks, as they can be estimated using remote sensing data and hold strong relationships with the belowground C gradient; and (2) SEM is facilitates to incorporate theoretical knowledge in empirical modeling approaches. is.Thomson Reuters ISIbelowground carbon stocks, hyperspectral, pls path modeling, random forests, sem, uav, vegetation attributes, carbon, climate change, decision trees, remote sensing, scanning electron microscopy, unmanned aerial vehicles (uav), wetlands, anthropogenic impacts, carbon stocks, floristic compositions, path models, structural equation modeling, structural information, vegetation, aboveground biomass, allometry, belowground biomass, carbon sequestration, mapping method, path analysis, peatland, spectral analysis, unmanned vehicle, vegetation cover, tracheophyta
Ciudades Resilientes2019Sitzia, Luca; Gayo, Eugenia M.; Sepulveda, Marcela; González, Juan S.; Ibañez, Lucia; Queffelec, Alain; De Pol-Holz, RicardoA perched, high-elevation wetland complex in the Atacama Desert (northern Chile) and its implications for past human settlementQuaternary Research10.1017/qua.2018.144A previously undocumented type of wetland is described from the Atacama Desert in northern Chile (3000 m above sea level), sustained exclusively by direct precipitation and perched above the regional water table. Geomorphological mapping, pedostratigraphy, geochemistry, and analysis of contemporary vegetation is used to understand wetland formation and dynamics during historical and present time periods. The paleowetland deposits overlie a Miocene tuff that acts as an impermeable barrier to water transfer and creates conditions for local shallow ground water. These deposits include several paleosols that were formed during periods when precipitation increased regionally at 7755–7300, 1270, 545, and 400–300 cal yr BP. The similarity in timing with other palaeohydrological records for the Atacama implies that paleosols from this wetland are proxies for reconstructing past changes in local and regional hydrological cycle. Archaeological investigations have revealed the presence of two small farms from the Late Intermediate period, i.e., during the earliest wetter phase represented by the paleosols. Both farms are located near the paleowetland deposits, which suggests that local inhabitants exploited these water sources during late pre-Hispanic times. Results of this study improve knowledge of settlement patterns during this and earlier cultural periods. is.1Thomson Reuters ISIatacama desert, central andes, desert wetlands, holocene, late intermediate period, perched wetlands, tuff, volcanic ash, deposits, groundwater, sea level, volcanoes, holocenes, intermediate periods, wetlands, formation mechanism, paleohydrology, paleosol, prehistoric, settlement pattern, wetland, andes, chile
Agua y Extremos; Cambio de Uso de Suelo2019Alvarez-Garreton, Camila; Lara, Antonio; Boisier, Juan Pablo; Galleguillos, MauricioThe Impacts of Native Forests and Forest Plantation on Water Supply in ChileForests10.3390/f10060473Over the past 40 years, south-central Chile has experienced important land-use-induced land cover changes, with massive conversion from native forests (NF) to Pinus radiata D.Don and Eucalyptus spp. exotic forest plantations (FP). Several case studies have related this conversion to a reduction in water supply within small catchments (<100 ha). In this work, we explore the impacts of NF and FP on streamflow by using a large-sample catchment dataset recently developed for Chile. We select 25 large forested catchments (>20,000 ha) in south-central Chile (35° S–41° S), analyze their land cover and precipitation spatial distributions, and fit a regression model to quantify the influence of NF, FP, grassland (GRA) and shrubland (SHR) partitions on annual runoff. To assess potential effects of land cover changes on water supply, we use the fitted model (R2 = 0.84) in synthetic experiments where NF, GRA and SHR covers within the catchments are replaced by patches of FP. We show that annual runoff consistently decreases with increments of FP, although the magnitude of the change (ranging from 2.2% to 7.2% mean annual runoff decrease for 10,000 ha increment in FP) depends on several factors, including the initial land cover partition within the basin, the replaced land cover class, the area of the catchment, and the type of catchment (drier or humid). Finally, in the context of the mitigation strategies pledged in the Chilean NDC (Nationally Determined Contributions defined after the Paris Agreement), which include the afforestation of 100,000 ha (mainly native forest) by 2030, we quantify the impacts on water supply due to the afforestation of 100,000 ha with different combinations of NF and FP. We show that annual runoff is highly sensitive to the relative area of FP to NF: ratios of FP to NF areas of 10%, 50% and 90% would lead to 3%, −18% and −40% changes in mean annual runoff, respectively. Our results can be used in the discussion of public policies and decision-making involving forests and land cover changes, as they provide scientifically-based tools to quantify expected impacts on water resources. In particular, this knowledge is relevant for decision making regarding mitigation strategies pledged in the Chilean NDC. is.6Thomson Reuters ISIchile, forest plantation, grassland, land use and land cover change, native forest, ndc, shrubland, water provision, water supply, catchments, decision making, land use, large dataset, reforestation, regression analysis, runoff, native forests, shrublands, land cover, land use change, plantation forestry, streamflow, eucalyptus, pinus radiata
Agua y Extremos2019Moreno, P.I.; Simi, E.; Villa-Martínez, R.P.; Vilanova, I.Early arboreal colonization, postglacial resilience of deciduous Nothofagus forests, and the Southern Westerly Wind influence in central-east Andean PatagoniaQuaternary Science Reviews10.1016/j.quascirev.2019.06.004The history and dynamics of deciduous Nothofagus forests along the eastern slopes of the central Patagonian Andes (44°-49°S) remain insufficiently studied and understood, particularly at timescales ranging from centuries to millennia. Available fossil pollen records point to time-transgressive responses of the arboreal vegetation to climatic changes during the Last Glacial Termination (T1) and early Holocene, and spatial heterogeneity since then along north-south, east-west, and elevation transects. The degree to which these results represent biogeographic and climatic trends, varying environmental gradients, or site-specific phenomena has not been assessed in detail. Here we present a fossil pollen and macroscopic charcoal record from Lago Churrasco (45°41′S, 71°49′W), a small closed-basin lake located in the deciduous Nothofagus forest zone of the central-east Andes of Chilean Patagonia. Our results suggest that Nothofagus trees colonized newly deglaciated terrains at ∼16,000 cal yr BP and formed scrublands/woodlands several millennia earlier than reported by previous studies east of the Andes. This suggests expansion and local densification of tree populations sourced from the eastern margin of the Patagonian Ice Sheet during the Last Glacial Maximum, with the additional implication that temperature and precipitation conditions favorable for tree survival and reproduction developed early during T1. We posit that the amount of moisture delivered by the Southern Westerly Winds was not a limiting factor for arboreal expansion during T1 in this sector of the central Patagonian Andes. Closed-canopy Nothofagus forests established at ∼10,000 cal yr BP and have remained essentially invariant despite climate change and natural disturbance regimes. This resilience was challenged and exceeded by human disturbance during the 20th century through the use of fire, leading to deforestation and spread of invasive exotic species in an extraordinarily rapid event. Our record suggests a permanent influence of the Southern Westerly Winds over the last 10,000 years, with relatively modest variations at centennial and millennial timescales. is.Thomson Reuters ISIcharcoal, deforestation, expansion, glacial geology, environmental gradient, invasive exotic species, last glacial maximum, last glacial terminations, natural disturbance regime, nothofagus forests, southern westerly winds, spatial heterogeneity, climate change, biogeography, climate variation, colonization, deciduous forest, deglaciation, disturbance, fossil record, heterogeneity, limiting factor, pollen, postglacial, precipitation (climatology), reproduction, vegetation type, andes, patagonia, nothofagus
Transversal2019Bozkurt, Deniz; Ezber, Yasemin; Sen, Omer LutfiRole of the East Asian trough on the eastern Mediterranean temperature variability in early spring and the extreme case of 2004 warm spellClimate Dynamics10.1007/s00382-019-04847-5This study investigates the potential influence of the East Asian trough (EAT) on the eastern Mediterranean temperature variability in early spring. In connection with this, it also examines the extreme case of the year 2004 when anomalous warming of the eastern Anatolia resulted in unprecedented snowmelt runoff amounts in the Euphrates and Tigris basins in early March. In the analyses, we used reanalysis data, gridded products of surface temperature and snow cover, river discharge data and satellite imagery. We employed an intensity index for the EAT and a trough displacement index for the Mediterranean trough (MedT) to explore the relationship between the strength of the EAT and the displacement of the MedT at pentad resolution. Our analysis shows that there are statistically significant correlations (at 99% confidence level) between the strength of the EAT and the zonal shift of the MedT on some pentads (e.g., 3rd, 13th, 37th and 59th), but that the highest correlation occurs on the 13th pentad of the year corresponding to the early days of March. It seems that, on this pentad, when the EAT is strong, the MedT tends to be located in the west of its climatological position (about 30−35E ) which causes warmer conditions over the eastern Mediterranean. In 2004, which appears to be an extreme year for this phenomenon, the MedT is positioned and deepened in the central Mediterranean (about 10−15E), and extended towards central Africa during the early days of March. This synoptic pattern provided favorable conditions for the development of a tropical plume/atmospheric river with a southwest-northeast orientation, carrying warm tropical African air towards the eastern Mediterranean and Anatolian highlands resulting in rapid melting of the snowpack as well as severe precipitation, and thus flooding events, in the eastern Anatolia. A key finding in our analysis is that the strengthening of the EAT was instrumental to the increased amplitude of the ridge-trough system over the Euro-Mediterranean region in the early days of 2004 spring. We highlight that the response of surface and upper level meteorological conditions to the amplitude of the ridge-trough system enhanced by the strength of the EAT might be crucial in the understanding of some of the extreme hydrometeorological events in the eastern Mediterranean region. is.Thomson Reuters ISIatmospheric river, atmospheric teleconnections, euphrates-tigris rivers, euro-mediterranean, hydrometeorological extreme events, rossby wave, confidence interval, extreme event, hydrometeorology, river discharge, snowmelt, spring (season), teleconnection, temperature profile, trough, warming, euphrates river, far east, mediterranean sea, mediterranean sea (east), tigris river
Agua y Extremos; Gobernanza e Interfaz Ciencia y Política2019Reynhout, Scott A.; Sagredo, Esteban A.; Kaplan, Michael R.; Aravena, Juan Carlos; Martini, Mateo A.; Moreno, Patricio I.; Rojas, Maisa; Schwartz, Roseanne; Schaefer, Joerg M.Holocene glacier fluctuations in Patagonia are modulated by summer insolation intensity and paced by Southern Annular Mode-like variabilityQuaternary Science Reviews10.1016/j.quascirev.2019.05.029Alpine glaciers are sensitive indicators of changes in climate, and their ubiquity in mountainous regions make them valuable proxies for terrestrial climate reconstructions worldwide. However, the timing and extent of glacier change across the South American mid-latitudes through the Holocene are still poorly constrained relative to their counterparts in the Northern Hemisphere. Here we report a new 10Be surface exposure-based chronology of moraines recording a series of progressively less-extensive glacier advances of Glaciar Torre (Argentina, 49.3°S/73.0°W) since the Last Glacial Maximum, with expansions culminating at 17,600 ± 900, 13,500 ± 500, 9700 ± 400, 6900 ± 200, 6100 ± 300, 4500 ± 200, and 530 ± 60 yr BP. The declining magnitude of Holocene glacier expansions parallels a gradual rise in local summer insolation intensity during the Holocene, while individual advances occurred during inferred negative Southern Annular Mode (SAM)-like states at centennial to millennial timescales. These observations suggest that (i) summer insolation intensity modulated antiphased trends in glacier extent in the polar hemispheres during the Holocene, and that (ii) centennial-scale ‘SAM-like’ temperature and precipitation anomalies paced glacier fluctuations throughout Patagonia. Given the persistence of the inferred ’SAM-like’ anomalies throughout the Holocene, the modern measured trend towards positive SAM index conditions could mark the onset of a fundamental shift in the climate of the Southern Hemisphere midlatitudes that warrants consideration in projections of future climate. is.Thomson Reuters ISIcosmogenic isotopes, geomorphology, glacial, glaciation, holocene, insolation, paleoclimatology, south america, southern annular mode, expansion, glacial geology, holocenes, incident solar radiation, chronology, glacier advance, last glacial maximum, midlatitude environment, mountain region, paleoclimate, precipitation (climatology), reconstruction, southern hemisphere, summer, argentina, patagonia
Zonas Costeras2019Aparicio-Rizzo, Pilar; Masotti, ItaloInter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central ChileRevista de Biología Marina y Oceanografía10.22370/rbmo.2019.54.1.1495The inter-annual variability of oceanographic conditions and phytoplankton abundance and biomass was studied using 10 years (1986-1996) of in situ observations at a fixed station in Valparaíso Bay (~33ºS). The time series analysis revealed that strong S-SW winds drive a quasi-permanent upwelling activity that maintain the nutrients availability in the water column to fuel the phytoplankton in the bay. The most important changes in bio-oceanographic conditions were observed during 1987 El Niño event, which was characterized by higher temperatures but lower values for salinity, nitrate, and phosphate concentrations, together with a decrease of phytoplankton biomass compared to 1988 La Niña event when colder, saltier, and nutrient-rich upwelled water were observed. High Aconcagua River discharges were observed during the El Niño conditions (1987-1988 and 1993), which led to a decrease in surface salinity and a high abundance of dinoflagellates. Two periods with differences in bio-oceanographic conditions were observed; 1988-1992 showed lower temperatures but higher nutrients (nitrate), phytoplankton biomass and abundance of diatoms than 1993-1996 period. Throughout the study period, positive trends in upwelling activity was registered accompanied by a fall in phytoplankton biomass and dinoflagellate abundance. This paper provides new evidences concerning the influence of El Niño Southern Oscillation (ENSO) in phytoplankton and oceanographic conditions in the coastal upwelling off central Chile. is.1Thomson Reuters ISIaconcagua river, enso, phytoplankton, upwelling, valparaíso bay, abundance, annual variation, biomass, dinoflagellate, el nino-southern oscillation, environmental factor, surface temperature, time series analysis, chile, valparaiso bay, valparaiso chile, bacillariophyta, dinophyceae
Agua y Extremos; Zonas Costeras2019Garreaud, René D.; Boisier, Juan P.; Rondanelli, Roberto; Montecinos, Aldo; Sepúlveda, Hector H.; Veloso‐Aguila, DanielThe Central Chile Mega Drought (2010–2018): A climate dynamics perspectiveInternational Journal of Climatology10.1002/joc.6219Central Chile, home to more than 10 million inhabitants, has experienced an uninterrupted sequence of dry years since 2010 with mean rainfall deficits of 20–40%. The so‐called Mega Drought (MD) is the longest event on record and with few analogues in the last millennia. It encompasses a broad area, with detrimental effects on water availability, vegetation and forest fires that have scaled into social and economical impacts. Observations and reanalysis data reveal that the exceptional length of the MD results from the prevalence of a circulation dipole‐hindering the passage of extratropical storms over central Chile—characterized by deep tropospheric anticyclonic anomalies over the subtropical Pacific and cyclonic anomalies over the Amundsen–Bellingshausen Sea. El Niño Southern Oscillation (ENSO) is a major modulator of such dipole, but the MD has occurred mostly under ENSO‐neutral conditions, except for the winters of 2010 (La Niña) and 2015 (strong El Niño). Climate model simulations driven both with historical forcing (natural and anthropogenic) and observed global SST replicate the south Pacific dipole and capture part of the rainfall anomalies. Idealized numerical experiments suggest that most of the atmospheric anomalies emanate from the subtropical southwest Pacific, a region that has experienced a marked surface warming over the last decade. Such warming may excite atmospheric Rossby waves whose propagation intensifies the circulation pattern leading to dry conditions in central Chile. On the other hand, anthropogenic forcing (greenhouse gases concentration increase and stratospheric ozone depletion) and the associated positive trend of the Southern Annular Mode also contribute to the strength of the south Pacific dipole and hence to the intensity and longevity of the MD. Given the concomitance of the seemingly natural (ocean sourced) and anthropogenic forcing, we anticipate only a partial recovery of central Chile precipitation in the decades to come. is.Thomson Reuters ISIchile, climate change, drought, enso, pdo, sam, south america, atmospheric pressure, deforestation, greenhouse gases, mechanical waves, oceanography, ozone layer, rain, tropics, anthropogenic forcing, anticyclonic anomalies, climate model simulations, numerical experiments, stratospheric ozone depletion, climate models, antarctic oscillation, anthropogenic effect, atmospheric dynamics, climate forcing, el nino-southern oscillation, pacific decadal oscillation, precipitation (climatology), rossby wave, amundsen sea, bellingshausen sea, pacific ocean, pacific ocean (south), pacific ocean (subtropical), southern ocean
Cambio de Uso de Suelo2019Alaniz, Alberto J.; Pérez‐Quezada, Jorge F.; Galleguillos, Mauricio; Vásquez, Alexis E.; Keith, David A.Operationalizing the IUCN Red List of Ecosystems in public policyConservation Letters10.1111/conl.12665Threats to ecosystems are closely linked to human development, whereas lack, insufficiency, and inefficiency of public policies are important drivers of environmental decline. Previous studies have discussed the contribution of IUCN's Red List of Ecosystems (RLE) in conservation issues; however, its applications in different policy fields and instruments for achieving biodiversity conservation have not been explored in detail. Here, we introduce a framework to operationalize the RLE in public policy, facilitating work of governments, practitioners, and decision makers. Our analysis identified 20 policy instruments that could reduce risks to ecosystems highlighted by different Red List criteria. We discuss how RLE could inform the policy process by analyzing different instruments that could be designed, implemented, and modified to achieve risk reduction. We also present practical examples from around the world showing how ecosystem conservation could be improved by operationalizing the RLE in policy instruments. The RLE criteria can inform the policy process by helping to shape objectives and identifying policy instruments that directly address the causes and severity of risks illuminated in Red List assessments. We conclude that RLE could be expanded into a broader holistic spectrum of policy instruments, which could be a key to achieving the ecosystem conservation. is.Thomson Reuters ISIassessment criteria, conservation planning, ecosystem conservation, land use planning, policy instruments, prioritization, threatened ecosystems
Agua y Extremos2019Aguayo, Rodrigo; León-Muñoz, Jorge; Vargas-Baecheler, José; Montecinos, Aldo; Garreaud, René; Urbina, Mauricio; Soto, Doris; Iriarte, José LuisThe glass half-empty: climate change drives lower freshwater input in the coastal system of the Chilean Northern PatagoniaClimatic Change10.1007/s10584-019-02495-6Oceanographic conditions in coastal Chilean northern Patagonia (41–46°S) are strongly influenced by freshwater inputs. Precipitation and streamflow records have shown a marked decrease in this area during the last decades. Given this hydro-climatic scenario, we evaluated the hydrological sensitivity driven by climate change in the Puelo River (average annual streamflow = 640 m³ s⁻¹), one of the most important sources of freshwater in the fjords and inland seas of Chile’s Northern Patagonia. A lumped hydrological model was developed to evaluate the potential impacts of climate change under the Representative Concentration Pathways (RCP) 2.6, 4.5, and 8.5 scenarios in the near future (2030–2060) using the delta change method based on 25 General Circulation Models. The model was fed by local hydro-meteorological data and remote sensors, simulating well the magnitude and seasonality of Puelo River streamflow. Considering the Refined Index of Agreement (RIA), the model achieved a high performance in the calibration (RIA = 0.79) and validation stages (RIA = 0.78). Under the RCP 8.5 scenario (multi-model mean), the projections suggest that the annual input of freshwater from the Puelo River to the Reloncaví Fjord would decrease by − 10% (1.6 km³ less freshwater); these decreases would mainly take place in summer (~ − 20%) and autumn (~ − 15%). The recurrence of extreme hydroclimatic events is also projected to increase in the future, with the probability of occurrence of droughts, such as the recent 2016 event with the lowest freshwater input in the last 70 years, doubling with respect to the historical records. is.Thomson Reuters ISIclimate models, digital storage, remote sensing, rivers, stream flow, water, general circulation model, historical records, hydrological modeling, index of agreements, meteorological data, oceanographic conditions, probability of occurrence, streamflow records, climate change, coastal zone, fjord, freshwater input, hydrometeorology, satellite sensor, streamflow, patagonia, puelo river
Cambio de Uso de Suelo2019Miranda, Alejandro; Vásquez, Inao A.; Becerra, Pablo; Smith-Ramírez, Cecilia; Delpiano, Cristian A.; Hernández-Moreno, Angela; Altamirano, AdisonTraits of perch trees promote seed dispersal of endemic fleshy-fruit species in degraded areas of endangered Mediterranean ecosystemsJournal of Arid Environments10.1016/j.jaridenv.2019.103995The presence and attributes of perch trees in degraded areas may promote seed dispersal. We evaluated the effect of the distance from remnant forest fragments on seed rain of different fleshy-fruit tree species and examined whether the seed rain is favoured by some traits of the perch trees (Acacia caven), such as canopy diameter and tree height. The study was carried out in two localities of central Chile with extensive “espinales” adjacent to remnant fragments of sclerophyllous forest. We installed 210 seed traps under the same number of A. caven trees along 10 transects in the two study areas. We set up the seed traps between 1 and 100 m away from forest fragments. We found a significant negative relationship between seed rain and distance. We also found a positive relationship between seed rain and the height and canopy diameter of the perch tree. Our results suggest that different woody species are able to disperse into the espinal, and that bigger A. caven trees are better perches than smaller individuals. We propose that at distances up to at least 100 m from forest fragments, seed availability does not limit natural regeneration into espinales. is.Thomson Reuters ISIbird seed dispersal, chilean sclerophyllous forests, forest restoration, seed rain, coniferous tree, endangered species, endemic species, forest ecosystem, fruit, restoration ecology, seed dispersal, chile, mediterranean region, acacia caven, aves
Agua y Extremos; Ciudades Resilientes; Cambio de Uso de Suelo2019Muñoz, Ariel A.; Klock-Barría, Karin; Sheppard, Paul R.; Aguilera-Betti, Isabella; Toledo-Guerrero, Isadora; Christie, Duncan A.; Gorena, Tamara; Gallardo, Laura; González-Reyes, Álvaro; Lara, Antonio; Lambert, Fabrice; Gayo, Eugenia; Barraza, Francisco; Chávez, Roberto O.Multidecadal environmental pollution in a mega-industrial area in central Chile registered by tree ringsScience of The Total Environment10.1016/j.scitotenv.2019.133915One of the most polluted areas in Chile is the Ventanas Industrial Area (VIA; 32.74°S / 71.48°W), which started in 1958 and today comprises around 16 industries in an area of ca. 4 km2. A lack of consistent long-term instrumental records precludes assessing the history of contamination in the area and also limits the evaluation of mitigation actions taken since the late 1980s. Here, we use dendrochemistry as an environmental proxy to analyze environmental changes over several decades at the VIA. We present chemical measurements of tree rings from planted, exotic Cupressus macrocarpa growing near the VIA with 4-year resolution over a period of 52 years (1960–2011). These data provide unprecedented information on regional anthropogenic pollution and are compared with a tree-ring elemental record of 48 years (1964–2011) from the Isla Negra (INE) control site not exposed to VIA emissions. For the 48 years of overlap between both sites, higher concentrations of Zn, V, Co, Cd, Ag, Fe, Cr, and Al were especially registered after the year 2000 at VIA compared to INE for the periods under study. Concentrations of Pb, Cu, As, Fe, Mo, Cr, and Zn increased through time, particularly over the period 1980–1990. Decontamination plans activated in 1992 appear to have had a positive effect on the amount of some elements, but the chemical concentration in the tree rings suggest continued accumulation of pollutants in the environment. Only after several years of implementation of the mitigation measures have some elements tended to decrease in concentration, especially at the end of the evaluated period. Dendrochemistry is a useful tool to provide a long-term perspective of the dynamics of trace metal pollution and represents a powerful approach to monitor air quality variability to extend the instrumental records back in time. is.Thomson Reuters ISIbaseline, cupressus macrocarpa, dendrochemistry, industrial pollution, trace metals, air quality, aluminum alloys, pollution control, trace elements, trees (mathematics), macrocarpa, trace metal, forestry, aluminum, arsenic, cadmium, chromium, cobalt, copper, iron, lead, molybdenum, silver, vanadium, zinc, anthropogenic source, concentration (composition), decadal variation, dendrochronology, environmental change, soil pollution, soil quality, tree ring, air monitoring, air pollution, article, biochemistry, chemical composition, chile, comparative study, controlled study, cupressus, environmental impact, geographic distribution, human activities, industrial area, plant structures, priority journal, temporal analysis, chemistry, environmental monitoring, industry, pollution, procedures, tree, environmental pollution, trees
Ciudades Resilientes2019Trewhela, Benjamín; Huneeus, Nicolás; Munizaga, Marcela; Mazzeo, Andrea; Menut, Laurent; Mailler, Sylvain; Valari, Myrto; Ordoñez, CesarAnalysis of exposure to fine particulate matter using passive data from public transportAtmospheric Environment10.1016/j.atmosenv.2019.116878The city of Santiago experiences extreme pollution events during winter due to particulate matter and the associated health impact depends on the exposure to this pollutant, particularly to PM2.5. We present and apply a method that estimates the exposure of users of the public transport system of Santiago by combining smart card mobility data with measured surface concentrations from the monitoring network of Santiago and simulated concentrations by the CHIMERE model. The method was applied between July 20th and 24th of 2015 to 105,588 users corresponding to 12% of the frequent users of the public transport system and approximately 2% of the total population of Santiago. During those five days, estimated exposure based on measured concentrations varied between 44 and 75 μg/m3 while exposure based on simulated concentrations varied between 45 and 89 μg/m3. Furthermore, including socioeconomic conditions suggests an inverse relationship between exposure and income when measured concentrations are used, i.e. the lower the income the higher the exposure, whereas no such relationship is observed when using simulated concentrations. Although only exposure to PM2.5 was considered in this study, the method can also be applied to estimate exposure to other urban pollutant such as ozone. is.Thomson Reuters ISIair quality, exposure, mobility, pm2.5, public transport users, carrier mobility, inverse problems, smart cards, extreme pollution events, fine particulate matter, public transport, public transport systems, socio-economic conditions, surface concentration, particles (particulate matter), ozone, air exposure, concentration (composition), health impact, particulate matter, socioeconomic conditions, air monitoring, air pollutant, article, chile, concentration (parameter), environmental exposure, income, model, particle size, population, priority journal, traffic and transport, urban area
Agua y Extremos; Ciudades Resilientes; Gobernanza e Interfaz Ciencia y Política; Transversal; Zonas Costeras2019Bozkurt, Deniz; Rojas, Maisa; Boisier, Juan Pablo; Rondanelli, Roberto; Garreaud, René; Gallardo, LauraDynamical downscaling over the complex terrain of southwest South America: present climate conditions and added value analysisClimate Dynamics10.1007/s00382-019-04959-yThis study evaluates hindcast simulations performed with a regional climate model (RCM, RegCM4) driven by reanalysis data (ERA-Interim) over the Pacific coast and Andes Cordillera of extratropical South America. A nested domain configuration at \(0.44^{\circ }\) ( \(\sim\) 50 km) and \(0.09^{\circ }\) ( \(\sim\) 10 km) spatial resolutions is used for the simulations. RegCM4 is also driven by a global climate model (GCM, MPI-ESM-MR) on the same domain configuration to asses the added values for temperature and precipitation (historical simulations). Overall, both 10 km hindcast and historical simulation results are promising and exhibit a better representation of near-surface air temperature and precipitation variability compared to the 50 km simulations. High-resolution simulations suppress an overestimation of precipitation over the Andes Cordillera of northern Chile found with the 50 km simulations. The simulated daily temperature and precipitation extreme indices from 10 km hindcast simulation show a closer estimation of the observed fields. A persistent warm bias ( \(\sim +\,{4\,}^{\circ }\hbox {C}\) ) over the Atacama Desert in 10 km hindcast simulation reveals the complexity in representing land surface and radiative processes over the desert. Difficulties in capturing the temperature trend in northern Chile are notable for both hindcast simulations. Both resolutions exhibit added values for temperature and precipitation over large parts of Chile, in particular, the 10 km resolves the coastal-valley Andes transitions over central Chile. Our results highlight that resolutions coarser than 50 km (e.g., GCMs and reanalysis) miss important climate gradients imposed by complex topography. Given that the highest spatial resolution of the current regional simulations over the South America is about 50 km, higher resolutions are important to improve our understanding of the dynamical processes that determine climate over complex terrain and extreme environments. is.Thomson Reuters ISIatacama desert, chile, climate variability, model evaluation, patagonia, temporal-spatial scale analysis, climate conditions, climate modeling, climate variation, complex terrain, downscaling, regional climate, spatial analysis, temporal analysis, andes, equus asinus
Ciudades Resilientes2019Smith, Pamela; Henríquez, CristiánPerception of thermal comfort in outdoor public spaces in the medium-sized city of Chillán, Chile, during a warm summerUrban Climate10.1016/j.uclim.2019.100525The study of thermal comfort in Latin American cities has been gaining great relevance for urban environmental planning. Some studies have evaluated the relationship between environmental and perceived comfort; however, the causes and social determinants of the different perceptions of the population have not been explored. The perception of thermal comfort in public spaces in the city of Chillán (Chile), which has an inland Mediterranean climate, is discussed in this context. First, we measured the environmental thermal comfort, adapting the Actual Sensation Vote index. A survey of 362 users of the five selected public spaces was carried out between 29 January and 01 February 2016 to obtain perceived comfort and relate it to the individual climatic history, use of public space and place of residence in the city. The results show that perceived thermal discomfort dominates over comfort on summer days; however, those users who visit public spaces for recreational purposes feel more comfortable, as well as those living in low socioeconomic status (SES) neighborhoods. On the other hand, users living in areas with higher socioeconomic status, have higher expectations regarding thermal environmental conditions. is.Thomson Reuters ISIenvironmental comfort, perceived thermal comfort, public space, socioeconomic status
Agua y Extremos2019Ramos, Alexandre M.; Wilson, Anna M.; DeFlorio, Michael J.; Warner, Michael D.; Barnes, Elizabeth; Garreaud, Rene; Gorodetskaya, Irina V.; Lavers, David A.; Moore, Benjamin; Payne, Ashley; Smallcomb, Chris; Sodemann, Harald; Wehner, Michael; Ralph, Fred Martin2018 International Atmospheric Rivers Conference: Multi‐disciplinary studies and high‐impact applications of atmospheric riversAtmospheric Science Letters10.1002/asl.935Atmospheric rivers (ARs) play a vital role in shaping the hydroclimate of many regions globally, and can substantially impact water resource management, emergency response planning, and other socioeconomic entities. The second International Atmospheric Rivers Conference took place at the Scripps Institution of Oceanography, University of California, San Diego, during 25–28 June, 2018, in La Jolla, California, USA. It was sponsored by the Center for Western Weather and Water Extremes (CW3E). A total of 120 people attended the Conference with 94 abstracts submitted and 30 participating students. In addition to the conference, the Student Forecasting Workshop was organised in the same week. During this workshop, students were exposed to AR forecasting tools, and learned examples of how these tools could be used to make decisions for various applications. The main goals of this conference were to bring together experts from across the fields of hydrology, atmospheric, oceanic, and polar sciences, as well as water management, civil engineering, and ecology to advance the state of AR science and to explore the future directions for the field. The conference was organised into traditional oral and poster presentations, along with panel discussions and Breakout Groups. This format allowed enhanced interaction between participants, driving progress within the scientific community and the enhanced communication of societal needs by various stakeholders. Several emerging topics of research were highlighted, including subseasonal‐to‐seasonal (S2S) prediction of ARs and an overview of the AR Reconnaissance campaign. In addition to providing a forum to disseminate and debate new results from scientific talks and posters, the conference was equally effective and useful in linking scientists to users and decision‐makers that require improved knowledge on ARs to manage resources and prepare for hazards. The third International Atmospheric Rivers Conference will be held in Chile in 2020, and hosted by the University of Chile, Santiago. is.9Thomson Reuters ISIatmospheric rivers, international atmospheric rivers conference, meeting report, atmosphere, conference proceeding, knowledge, research work, student, california, chile, la jolla, metropolitana, san diego, united states
Agua y Extremos; Ciudades Resilientes2019Gayo, Eugenia M.; McRostie, Virginia B.; Campbell, Roberto; Flores, Carola; Maldonado, Antonio; Uribe-Rodriguez, Mauricio; Moreno, Patricio I.; Santoro, Calogero M.; Christie, Duncan A.; Muñoz, Ariel A.; Gallardo, LauraGeohistorical records of the Anthropocene in ChileElem Sci Anth10.1525/elementa.353The deep-time dynamics of coupled socio-ecological systems at different spatial scales is viewed as a key framework to understand trends and mechanisms that have led to the Anthropocene. By integrating archeological and paleoenvironmental records, we test the hypothesis that Chilean societies progressively escalated their capacity to shape national biophysical systems as socio-cultural complexity and pressures on natural resources increased over the last three millennia. We demonstrate that Pre-Columbian societies intentionally transformed Chile’s northern and central regions by continuously adjusting socio-cultural practices and/or incorporating technologies that guaranteed resource access and social wealth. The fact that past human activities led to cumulative impacts on diverse biophysical processes, not only contradicts the notion of pristine pre-Industrial Revolution landscapes, but suggests that the Anthropocene derives from long-term processes that have operated uninterruptedly since Pre-Columbian times. Moreover, our synthesis suggests that most of present-day symptoms that describe the Anthropocene are rooted in pre-Columbian processes that scaled up in intensity over the last 3000 years, accelerating after the Spanish colonization and, more intensely, in recent decades. The most striking trend is the observed coevolution between the intensity of metallurgy and heavy-metal anthropogenic emissions. This entails that the Anthropocene cannot be viewed as a universal imprint of human actions that has arisen as an exclusive consequence of modern industrial societies. In the Chilean case, this phenomenon is intrinsically tied to historically and geographically diverse configurations in society-environment feedback relationships. Taken collectively with other case studies, the patterns revealed here could contribute to the discussion about how the Anthropocene is defined globally, in terms of chronology, stratigraphic markers and attributes. Furthermore, this deep-time narrative can potentially become a science-based instrument to shape better-informed discourses about the socio-environmental history in Chile. More importantly, however, this research provides crucial “baselines” to delineate safe operating spaces for future socio-ecological systems. is.1Thomson Reuters ISIanthropogenic landscapes, archeological records, historical ecology, niche construction, paleoenvironmental records, socio-ecological systems, anthropocene, anthropogenic source, archaeology, biophysics, coevolution, colonization, complexity, heavy metal, historical record, landscape, metallurgy, paleoenvironment, social change
Gobernanza e Interfaz entre Ciencia y Política, Zonas Costeras2018Moraga, P., Delgado, V.
Sentencia Corte Suprema de 27 de agosto de 2018: Protección de Humedales Artificiales
Actualidad Jurídica Ambiental
La Junta de Vecinos Jardín Oriente 3, Agrupación Cultural por los Humedales y Entornos Naturales y la Sociedad Educacional Winkler Contreras (dueña del colegio Da Vinci), todos vecinos del sector denominado Jardín Oriente de la comuna de Puerto Montt dedujeron recurso de protección en contra de la Inmobiliaria GPR Puerto Varas Limitada (en adelante, “Inmobiliaria GPR”), Inmobiliaria Socovesa Sur S.A. (a continuación Socovesa) y el Servicio de Vivienda y Urbanismo de la Región de Los Lagos (en adelante SERVIU). El principal cuestionamiento es el proceder arbitrario e ilegal de la Inmobiliaria GPR que intervino el Humedal Llantén sin contar con los permisos sectoriales para realizar las obras. Lo anterior significó la modificación del cauce denominado “estero sin nombre”, como consecuencia del drenaje de las aguas del humedal, lo cual unido a las fuertes precipitaciones que afectan normalmente a la Región y el desborde de la piscina que administran las segundas recurridas causó diversas inundaciones que dañaron severamente los inmuebles cercanos y el colegio Da Vinci, que debió ser cerrado durante dichos episodios, además de la afectación del ecosistema del humedal. A su vez se señala que la Inmobiliaria Socovesa mantiene en terrenos de su propiedad, una piscina de retención de aguas lluvias para los conjuntos habitacionales que construyó en el sector y que es administrada por el Servicio de Vivienda y Urbanismo (SERVIU), la cual en periodos de fuertes lluvias sobrepasa su capacidad provocando el desborde de sus aguas y, posterior anegamientos de los terrenos colindantes. La Corte Suprema acoge la acción de protección y sostiene que el actuar de los recurridos se aparta de la normativa jurídica ambiental y urbanística y, por ende, lesiona las garantías constitucionales del derecho a la integridad física y psíquica de toda persona (art. 19 Nº 1) y la de vivir en un medio ambiente libre de contaminación (art. 19 Nº 8), en este caso, “respecto de los habitantes del sector Oriente de la comuna de Puerto Montt”, disponiéndose las siguientes medidas: a) La Municipalidad deberá revisar los permisos de construcción y recepciones de obras que autorizó a los recurridos, sobre la base que el sector cuenta con un humedal y por él pasa una vía fluvial que es parte de la red primaria del Sistemas de Evacuación y Drenaje de Aguas Lluvias. b) SERVIU deberá planificar, estudiar y fiscalizar el correcto funcionamiento de la piscina de retención de aguas lluvias, cuyo funcionamiento deberá mantener la Inmobiliaria Socovesa. d) Inmobiliaria GPR desplegará todas las medidas que sean necesarias para la protección del Humedal, mientras la Seremi del Medio Ambiente de la Región de Los Lagos estudia y revisa la situación en que se encuentra el mismo, con el fin de adoptar las providencias del caso. e) En el plazo de tres años el colegio deberá ser reubicado para despejar el área de escurrimiento natural de las aguas lluvias del sector.
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Gobernanza e Interfaz entre Ciencia y Política2019Blanco-Wells, G.
La vida social de la energía: apuntes para el estudio territorializado de las transiciones energéticas
Resumen Se presenta una propuesta teórica y metodológica para el estudio sociológico de la transición energética hacia energías renovables no convencionales, entendida como un proceso de cambio inducido vinculado a cambio climático, cuyos cursos de acción no están exentos de controversias sociotécnicas. La investigación se fundamenta en cuatro años de investigación sobre trayectorias territoriales de producción, uso y significación de la energía en tres regiones del sur-austral de Chile. A partir de una matriz teórica de la transición energética basada en los grados de renovabilidad y convencionalidad de la energía, se identifican diferentes regímenes sociotécnicos a partir de los cuales se debe indagar de modo empírico las formas situadas que adopta esta transición. Cada uno de estos regímenes fue investigado a través de casos de estudio lo que nos permite presentar aprendizajes generales de interés sociológico. A modo de conclusión, se propone ir más allá del concepto de régimen a través de la noción de ensamblaje, lo que permite explorar modos no lineales en que se asocian agentes heterogéneos en la territorialización de la energía. Además, se plantea que los grados de aceptación o rechazo social de la energía no debe ser el motor que mueva la investigación sobre esta materia, sino la forma en que las sociedades definen, debaten y construyen pragmáticamente formas democráticas y justas de uso energético en cada territorio. Desde nuestra perspectiva, esto supone avanzar en comprender estos procesos como parte de las soberanías energéticas de los pueblos.
vol.21 is.51Scopus
Gobernanza e Interfaz entre Ciencia y Política2019Blanco Wells, Gustavo; Gunther, María GriseldaDe crisis, ecologías y transiciones: reflexiones sobre teoría social latinoamericana frente al cambio ambiental globalRevista Colombiana de Sociología10.15446/rcs.v42n1.73190Este artículo contribuye a desplegar el campo de relaciones que se ha establecido entre las nociones de crisis y cambio ambiental global, a través de la revisión de las principales tradiciones de pensamiento ambiental con influencia en América Latina, a partir de la década de 1970. Con este objetivo, se examinan los rasgos distintivos de la representación de lo ambiental en la producción académica de las ciencias sociales regionales, las construcciones éticas sobre las que se sostiene esta producción y las relaciones que se establecen entre ecología, crisis y desarrollo. El texto presenta un panorama general tanto de la producción identificada con Latinoamérica, como de las adaptaciones e interpretaciones de otros idearios y pensamientos de origen no latinoamericano, pero de reconocida influencia regional. Metodológicamente, se realiza un trabajo de doble hermenéutica sobre la bibliografía relevante, principalmente a través de textos y autores que inspiran y fundan las perspectivas estudiadas. El primer apartado hace un recorrido analítico y descriptivo sobre las nociones de crisis y las respuestas éticas hacia la naturaleza que sirven de base a las propuestas teóricas. El segundo apartado presenta un panorama de la construcción de la problemática ambiental desde cinco grandes grupos de perspectivas teóricas: la economía ambiental y ecológica, el marxismo ecológico, la modernización ecológica, la ecología política, la ontología política y la perspectiva decolonial. Finalmente, se presentan las conclusiones y reflexiones sobre los alcances políticos y prácticos de la producción teórica ambiental en Latinoamérica. Afirmamos que el pensamiento social latinoamericano sobre el cambio ambiental global ―dadas las realidades sociomateriales sobre las que funda su evidencia― se encuentra en una posición privilegiada para