Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum
International audience The interaction between ocean circulation and biological processes in the Southern Ocean is thought to be a major control on atmospheric carbon dioxide content over glacial cycles. A better understanding of stratification and circulation in the Southern Ocean during the Last G...
Published in: | Paleoceanography |
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Online Access: | https://hal.archives-ouvertes.fr/hal-02915959 https://hal.archives-ouvertes.fr/hal-02915959/document https://hal.archives-ouvertes.fr/hal-02915959/file/2015PA002915.pdf https://doi.org/10.1002/2015PA002915 |
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ftccsdartic:oai:HAL:hal-02915959v1 2023-05-15T13:54:56+02:00 Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum Lynch-Stieglitz, Jean Ito, Takamitsu Michel, Elisabeth Georgia Institute of Technology Atlanta Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) 2016-05 https://hal.archives-ouvertes.fr/hal-02915959 https://hal.archives-ouvertes.fr/hal-02915959/document https://hal.archives-ouvertes.fr/hal-02915959/file/2015PA002915.pdf https://doi.org/10.1002/2015PA002915 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002915 hal-02915959 https://hal.archives-ouvertes.fr/hal-02915959 https://hal.archives-ouvertes.fr/hal-02915959/document https://hal.archives-ouvertes.fr/hal-02915959/file/2015PA002915.pdf doi:10.1002/2015PA002915 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.archives-ouvertes.fr/hal-02915959 Paleoceanography, American Geophysical Union, 2016, 31 (5), pp.539-552. ⟨10.1002/2015PA002915⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1002/2015PA002915 2021-12-19T00:52:16Z International audience The interaction between ocean circulation and biological processes in the Southern Ocean is thought to be a major control on atmospheric carbon dioxide content over glacial cycles. A better understanding of stratification and circulation in the Southern Ocean during the Last Glacial Maximum (LGM) provides information that will help us to assess these scenarios. First, we evaluate the link between Southern Ocean stratification and circulation states in a suite of climate model simulations. While simulated Antarctic Circumpolar Current (ACC) transport varies widely (80-350 Sverdrup (Sv)), it co-varies with horizontal and vertical stratification and the formation of the southern deep water. We then test the LGM simulations against available data from paleoceanographic proxies, which can be used to assess the density stratification and ACC transport south of Australia. The paleoceanographic data suggest a moderate increase in the Southern Ocean stratification and the ACC strength during the LGM. Even with the relatively large uncertainty in the proxy-based estimates, extreme scenarios exhibited by some climate models with ACC transports of greater than 250 Sv and highly saline Antarctic Bottom Water are highly unlikely. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Southern Ocean Paleoceanography 31 5 539 552 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Lynch-Stieglitz, Jean Ito, Takamitsu Michel, Elisabeth Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience The interaction between ocean circulation and biological processes in the Southern Ocean is thought to be a major control on atmospheric carbon dioxide content over glacial cycles. A better understanding of stratification and circulation in the Southern Ocean during the Last Glacial Maximum (LGM) provides information that will help us to assess these scenarios. First, we evaluate the link between Southern Ocean stratification and circulation states in a suite of climate model simulations. While simulated Antarctic Circumpolar Current (ACC) transport varies widely (80-350 Sverdrup (Sv)), it co-varies with horizontal and vertical stratification and the formation of the southern deep water. We then test the LGM simulations against available data from paleoceanographic proxies, which can be used to assess the density stratification and ACC transport south of Australia. The paleoceanographic data suggest a moderate increase in the Southern Ocean stratification and the ACC strength during the LGM. Even with the relatively large uncertainty in the proxy-based estimates, extreme scenarios exhibited by some climate models with ACC transports of greater than 250 Sv and highly saline Antarctic Bottom Water are highly unlikely. |
author2 |
Georgia Institute of Technology Atlanta Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Paléocéanographie (PALEOCEAN) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) |
format |
Article in Journal/Newspaper |
author |
Lynch-Stieglitz, Jean Ito, Takamitsu Michel, Elisabeth |
author_facet |
Lynch-Stieglitz, Jean Ito, Takamitsu Michel, Elisabeth |
author_sort |
Lynch-Stieglitz, Jean |
title |
Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum |
title_short |
Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum |
title_full |
Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum |
title_fullStr |
Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum |
title_full_unstemmed |
Antarctic density stratification and the strength of the circumpolar current during the Last Glacial Maximum |
title_sort |
antarctic density stratification and the strength of the circumpolar current during the last glacial maximum |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.archives-ouvertes.fr/hal-02915959 https://hal.archives-ouvertes.fr/hal-02915959/document https://hal.archives-ouvertes.fr/hal-02915959/file/2015PA002915.pdf https://doi.org/10.1002/2015PA002915 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.archives-ouvertes.fr/hal-02915959 Paleoceanography, American Geophysical Union, 2016, 31 (5), pp.539-552. ⟨10.1002/2015PA002915⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015PA002915 hal-02915959 https://hal.archives-ouvertes.fr/hal-02915959 https://hal.archives-ouvertes.fr/hal-02915959/document https://hal.archives-ouvertes.fr/hal-02915959/file/2015PA002915.pdf doi:10.1002/2015PA002915 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015PA002915 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
5 |
container_start_page |
539 |
op_container_end_page |
552 |
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1766261139874775040 |