7 de Mayo | Charla "Observational determination of albedo decrease caused by vanishing Arctic sea ice"

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Te invitamos a la Charla de nuestra investigadora PostDoctorante, Kristina Pistone. El Miércoles 7 de Mayo a las 14:30 hrs. Sala de Seminarios 5to Piso del Departamento de Geofísica. FCFM (Blanco Encalada 2002)

La charla será transmitida por streaming en: https://new.livestream.com/accounts/7520184

kristinaResumen:

The decline of Arctic sea ice has been documented in over 30 years of satellite passive microwave observations. The resulting darkening of the Arctic and its amplification of global warming was hypothesized almost 50 years ago but has yet to be verified with direct observations. This study uses satellite radiation budget measurements along with satellite microwave sea ice data to document the Arctic-wide decrease in planetary albedo and its amplifying effect on the warming. The analysis reveals a striking relationship between planetary albedo and sea ice cover, quantities inferred from two independent satellite instruments. We find that the Arctic planetary albedo has decreased from 0.52 to 0.48 between 1979 and 2011; when averaged globally, this extra energy corresponds to a forcing that is 25% as large as that due to the change in CO2 during this period, considerably larger than expectations from models and other less direct recent estimates. Changes in cloudiness appear to play a negligible role in observed Arctic darkening, thus reducing the possibility of Arctic cloud albedo feedbacks mitigating future Arctic warming.

 Expositora:
Kristina Pistone recibió su doctorado en 2014 de Scripps Institution of Oceanography, en la Universidad de California, San Diego, donde también trabajaba con asuntos de las interacciones entre aerosoles y nubes.  Ahora es becaria Fulbright en DGF-(CR)2 en la Universidad de Chile.


Para ver la charla en directo: https://new.livestream.com/accounts/7520184
(página: http://new.livestream.com/ Canal: “Difusión CR2”/ cr2prensa@gmail.com)