Línea de investigación:

Ciudades resilientes

Según Naciones Unidas, aunque las ciudades cubrieron menos del 2% de la superficie terrestre en 2011, consumieron casi el 80% de la energía mundial y produjeron más del 60% de todo el dióxido de carbono. Esto es relevante para Chile, donde casi el 90% de la población se considera urbana y aproximadamente la mitad de la habitantes se concentra en solo tres áreas metropolitanas: Santiago, Valparaíso y Concepción.

Varias ciudades del país experimentan una mala calidad de aire asociada a la combustión residencial y el transporte. Ante ello, el gobierno chileno incluyó planes de descontaminación y un impuesto al diésel en la Contribución Nacionalmente Determinada (NDC, por sus siglas en inglés) para el Acuerdo de París. Además, nuestras ciudades son altamente vulnerables a los efectos del cambio climático, como inundaciones, sequías, olas de calor y problemas de salud. Estas amenazas se ven agravadas por la desigualdad social y la segregación urbana.

El (CR)2 ha desarrollado e implementado modelos, inventarios de emisiones y otras herramientas, además de diagnósticos y análisis integrales de temas urbanos. Sin embargo, es necesario comprender mejor las dinámicas entre la energía, el uso del suelo, las emisiones, la demografía, la gobernanza y los procesos sociales y biofísicos.

Para ello, el equipo de investigación examinará los impactos urbanos en diferentes escalas de tiempo: desde registros paleoclimáticos de los primeros asentamientos humanos en Chile hasta proyecciones de posibles condiciones para las ciudades en escenarios climáticos futuros.

El área de ciencias sociales de nuestro grupo trabajará para comprender cómo la sociedad, desde las comunidades locales a las autoridades nacionales, se está adaptando a los cambios en eventos extremos, a través de la investigación centrada en las prácticas actuales, su utilidad, las barreras para la implementación y las oportunidades de mejora.

INVESTIGADORA PRINCIPAL

CO-INVESTIGADORA PRINCIPAL

INVESTIGADORES ASOCIADOS

INVESTIGADORES ADJUNTOS

INVESTIGADORES POSTDOCTORALES

ESTUDIANTES

 

Noticias relacionadas al tema

Línea de InvestigaciónAñoAutoresTítuloRevistaFicha de PublicaciónDOIAbstractAccesoPáginasVolumenIndex
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.
http://www.inderscience.com/link.php?id=84785347vol.12Thomson Reuters ISI
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.
http://dx.plos.org/10.1371/journal.pone.0181759e0181759vol.12Thomson 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.http://linkinghub.elsevier.com/retrieve/pii/S1040618216312368vol. in pressThomson 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.http://journal.frontiersin.org/article/10.3389/feart.2017.00077/fullvol.5Thomson Reuters ISI
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.https://www.geosci-model-dev.net/10/4035/2017/4035-4055vol.10Thomson Reuters ISI
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.http://www.aaqr.org/doi/10.4209/aaqr.2017.01.0022127-144vol.18 is.1Thomson Reuters ISI
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.https://www.ncbi.nlm.nih.gov/pubmed/29414372477-487vol.236Thomson Reuters ISI
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.http://linkinghub.elsevier.com/retrieve/pii/S1352231018300633142-155vol.179Thomson Reuters ISI
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.
http://www.revistalatinacs.org/072paper/1216/RLCS-paper1216.pdf1218-1237vol.72Thomson Reuters ESCI
Agua y Extremos; Cambio de Uso de Suelo; Ciudades Resilientes; Gobernanza e Interfaz 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.http://www.nature.com/articles/s41598-018-21836-6vol.8 is.1Thomson Reuters ISI
Ciudades Resilientes2018Shaffer, G., Lambert, F.
In and out of glacial extremes by way of dust−climate feedbacks
Proceedings of the National Academy of Sciences
10.1073/pnas.1708174115
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.http://www.pnas.org/lookup/doi/10.1073/pnas.17081741152026-2031vol.115 is.9Thomson Reuters ISI
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.http://linkinghub.elsevier.com/retrieve/pii/S1352231018301560105-114vol.182Thomson Reuters ISI
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.https://www.the-cryosphere.net/12/1069/2018/1069-1090vol.12 is.3
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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.http://linkinghub.elsevier.com/retrieve/pii/S003101821730874X22-34vol.499Thomson Reuters ISI
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.
https://www.geosci-model-dev.net/11/1033/2018/1033-1057vol.11 is.3Thomson Reuters ISI
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.https://www.elementascience.org/article/10.1525/elementa.293/38vol.6 is.1Thomson Reuters ISI
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.http://linkinghub.elsevier.com/retrieve/pii/S030142151730157X1-11vol.106Thomson Reuters ISI
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.http://linkinghub.elsevier.com/retrieve/pii/S00489697183176011526-1536vol.637-638Thomson Reuters ISI
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.https://www.geosci-model-dev.net/11/2209/2018/2209-2229vol.11Thomson Reuters ISI
Ciudades Resilientes2018A. Urquiza, C. Amigo, M. Billi, G. Bradao, B. MoralesMetálogo como herramienta de colaboración transdisciplinariaCinta 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 Chilehttps://cintademoebio.uchile.cl/index.php/CDM/article/view/49461/51936182-198vol.62 is.16Scopus