Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation
National audience The West Antarctic climate has witnessed large changes during the second half of the twentieth century including a strong and widespread continental warming, important regional changes in sea-ice extent and snow accumulation, as well as a major mass loss from the melting of some ic...
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Online Access: | https://hal.science/hal-03662817 https://doi.org/10.1007/s00382-021-05879-6 |
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ftcollegfrance:oai:HAL:hal-03662817v1 2024-06-23T07:45:27+00:00 Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation Dalaiden, Quentin Goosse, Hugues Rezsohazy, Jeanne Thomas, Elizabeth R. Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2021 https://hal.science/hal-03662817 https://doi.org/10.1007/s00382-021-05879-6 fr fre HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-021-05879-6 hal-03662817 https://hal.science/hal-03662817 doi:10.1007/s00382-021-05879-6 WOS: 000673095300001 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-03662817 Climate Dynamics, 2021, 57 (11-12), pp.3479--3503. ⟨10.1007/s00382-021-05879-6⟩ Climate reconstruction AntarcticIce cores Climate models Data assimilation [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftcollegfrance https://doi.org/10.1007/s00382-021-05879-6 2024-06-13T23:36:40Z National audience The West Antarctic climate has witnessed large changes during the second half of the twentieth century including a strong and widespread continental warming, important regional changes in sea-ice extent and snow accumulation, as well as a major mass loss from the melting of some ice shelves. However, the potential links between those observed changes are still unclear and instrumental data do not allow determination of whether they are part of a long-term evolution or specific to the recent decades. In this study, we analyze the climate variability of the past two centuries in the West Antarctic sector by reconstructing the key atmospheric variables (atmospheric circulation, near-surface air temperature and snow accumulation) as well as the sea-ice extent at the annual timescale using a data assimilation approach. To this end, information from Antarctic ice core records (snow accumulation and delta O-18) and tree-ring width records situated in the mid-latitudes of the Southern Hemisphere are combined with the physics of climate models using a data assimilation method. This ultimately provides a complete spatial reconstruction over the West Antarctic region. Our reconstruction reproduces well the main characteristics of the observed changes over the instrumental period. We show that the observed sea-ice reduction in the Bellingshausen-Amundsen Sea sector over the satellite era is part of a long-term trend, starting at around 1850 CE, while the sea-ice expansion in the Ross Sea sector has only started around 1950 CE. Furthermore, according to our reconstruction, the Amundsen Sea Low pressure (ASL) displays no significant linear trend in its strength or position over 1850-1950 CE but becomes stronger and shifts eastward afterwards. The year-to-year sea-ice variations in the Ross Sea sector are strongly related to the ASL variability over the past two centuries, including the recent trends. By contrast, the link between ASL and sea-ice in the Bellingshausen-Amundsen Sea sector changes with time, ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic ice core Ice Shelves Ross Sea Sea ice Collège de France: HAL Amundsen Sea Antarctic Ross Sea Climate Dynamics 57 11-12 3479 3503 |
institution |
Open Polar |
collection |
Collège de France: HAL |
op_collection_id |
ftcollegfrance |
language |
French |
topic |
Climate reconstruction AntarcticIce cores Climate models Data assimilation [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Climate reconstruction AntarcticIce cores Climate models Data assimilation [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Dalaiden, Quentin Goosse, Hugues Rezsohazy, Jeanne Thomas, Elizabeth R. Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation |
topic_facet |
Climate reconstruction AntarcticIce cores Climate models Data assimilation [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
National audience The West Antarctic climate has witnessed large changes during the second half of the twentieth century including a strong and widespread continental warming, important regional changes in sea-ice extent and snow accumulation, as well as a major mass loss from the melting of some ice shelves. However, the potential links between those observed changes are still unclear and instrumental data do not allow determination of whether they are part of a long-term evolution or specific to the recent decades. In this study, we analyze the climate variability of the past two centuries in the West Antarctic sector by reconstructing the key atmospheric variables (atmospheric circulation, near-surface air temperature and snow accumulation) as well as the sea-ice extent at the annual timescale using a data assimilation approach. To this end, information from Antarctic ice core records (snow accumulation and delta O-18) and tree-ring width records situated in the mid-latitudes of the Southern Hemisphere are combined with the physics of climate models using a data assimilation method. This ultimately provides a complete spatial reconstruction over the West Antarctic region. Our reconstruction reproduces well the main characteristics of the observed changes over the instrumental period. We show that the observed sea-ice reduction in the Bellingshausen-Amundsen Sea sector over the satellite era is part of a long-term trend, starting at around 1850 CE, while the sea-ice expansion in the Ross Sea sector has only started around 1950 CE. Furthermore, according to our reconstruction, the Amundsen Sea Low pressure (ASL) displays no significant linear trend in its strength or position over 1850-1950 CE but becomes stronger and shifts eastward afterwards. The year-to-year sea-ice variations in the Ross Sea sector are strongly related to the ASL variability over the past two centuries, including the recent trends. By contrast, the link between ASL and sea-ice in the Bellingshausen-Amundsen Sea sector changes with time, ... |
author2 |
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Dalaiden, Quentin Goosse, Hugues Rezsohazy, Jeanne Thomas, Elizabeth R. |
author_facet |
Dalaiden, Quentin Goosse, Hugues Rezsohazy, Jeanne Thomas, Elizabeth R. |
author_sort |
Dalaiden, Quentin |
title |
Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation |
title_short |
Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation |
title_full |
Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation |
title_fullStr |
Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation |
title_full_unstemmed |
Reconstructing atmospheric circulation and sea-ice extent in the WestAntarctic over the past 200 years using data assimilation |
title_sort |
reconstructing atmospheric circulation and sea-ice extent in the westantarctic over the past 200 years using data assimilation |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03662817 https://doi.org/10.1007/s00382-021-05879-6 |
geographic |
Amundsen Sea Antarctic Ross Sea |
geographic_facet |
Amundsen Sea Antarctic Ross Sea |
genre |
Amundsen Sea Antarc* Antarctic ice core Ice Shelves Ross Sea Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctic ice core Ice Shelves Ross Sea Sea ice |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-03662817 Climate Dynamics, 2021, 57 (11-12), pp.3479--3503. ⟨10.1007/s00382-021-05879-6⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-021-05879-6 hal-03662817 https://hal.science/hal-03662817 doi:10.1007/s00382-021-05879-6 WOS: 000673095300001 |
op_doi |
https://doi.org/10.1007/s00382-021-05879-6 |
container_title |
Climate Dynamics |
container_volume |
57 |
container_issue |
11-12 |
container_start_page |
3479 |
op_container_end_page |
3503 |
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1802639739407302656 |