Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica
A record-setting temperature of 17.5 degrees 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 Ima...
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Online Access: | https://doi.org/10.1002/2017JD027796 https://repositorio.uchile.cl/handle/2250/151991 |
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ftunivchile:oai:repositorio.uchile.cl:2250/151991 2023-05-15T13:34:35+02:00 Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica Bozkurt, Deniz Rondanelli Rojas, Roberto Marín, J. C. Garreaud Salazar, René 2018-04-27 application/pdf https://doi.org/10.1002/2017JD027796 https://repositorio.uchile.cl/handle/2250/151991 en eng American Geophysical Union Journal of Geophysical Research: Atmospheres, 123, 3871–3892 doi:10.1002/2017JD027796 https://repositorio.uchile.cl/handle/2250/151991 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Journal of Geophysical Research: Atmospheres Foehn wind Extreme high temperature Atmospheric river Climate variability Meteorology Regional climate modeling Artículo de revista 2018 ftunivchile https://doi.org/10.1002/2017JD027796 2023-01-22T00:52:06Z A record-setting temperature of 17.5 degrees 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 (approximate to 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. FONDAP/CONICYT Chile 15110009-CR2 Scientific Committee on Antarctic Research (SCAR) University of Wisconsin-Madison Antarctic Meteorological Research Center for the data set, data display, and information (NSF grant) ANT-1535632 NLHPC Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Sheet Ice Shelf SCAR Scientific Committee on Antarctic Research Sea ice Universidad de Chile: Repositorio académico Antarctic The Antarctic Antarctic Peninsula Bellingshausen Sea Pacific Esperanza ENVELOPE(-56.983,-56.983,-63.400,-63.400) Esperanza Station ENVELOPE(-56.996,-56.996,-63.395,-63.395) Journal of Geophysical Research: Atmospheres 123 8 3871 3892 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Foehn wind Extreme high temperature Atmospheric river Climate variability Meteorology Regional climate modeling |
spellingShingle |
Foehn wind Extreme high temperature Atmospheric river Climate variability Meteorology Regional climate modeling Bozkurt, Deniz Rondanelli Rojas, Roberto Marín, J. C. Garreaud Salazar, René Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica |
topic_facet |
Foehn wind Extreme high temperature Atmospheric river Climate variability Meteorology Regional climate modeling |
description |
A record-setting temperature of 17.5 degrees 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 (approximate to 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. FONDAP/CONICYT Chile 15110009-CR2 Scientific Committee on Antarctic Research (SCAR) University of Wisconsin-Madison Antarctic Meteorological Research Center for the data set, data display, and information (NSF grant) ANT-1535632 NLHPC |
format |
Article in Journal/Newspaper |
author |
Bozkurt, Deniz Rondanelli Rojas, Roberto Marín, J. C. Garreaud Salazar, René |
author_facet |
Bozkurt, Deniz Rondanelli Rojas, Roberto Marín, J. C. Garreaud Salazar, René |
author_sort |
Bozkurt, Deniz |
title |
Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica |
title_short |
Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica |
title_full |
Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica |
title_fullStr |
Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica |
title_full_unstemmed |
Foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica |
title_sort |
foehn event triggered by an atmospheric river underlies record-setting temperature along continental antarctica |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
https://doi.org/10.1002/2017JD027796 https://repositorio.uchile.cl/handle/2250/151991 |
long_lat |
ENVELOPE(-56.983,-56.983,-63.400,-63.400) ENVELOPE(-56.996,-56.996,-63.395,-63.395) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Bellingshausen Sea Pacific Esperanza Esperanza Station |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Bellingshausen Sea Pacific Esperanza Esperanza Station |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Sheet Ice Shelf SCAR Scientific Committee on Antarctic Research Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Sheet Ice Shelf SCAR Scientific Committee on Antarctic Research Sea ice |
op_source |
Journal of Geophysical Research: Atmospheres |
op_relation |
Journal of Geophysical Research: Atmospheres, 123, 3871–3892 doi:10.1002/2017JD027796 https://repositorio.uchile.cl/handle/2250/151991 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1002/2017JD027796 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
123 |
container_issue |
8 |
container_start_page |
3871 |
op_container_end_page |
3892 |
_version_ |
1766054481828511744 |