Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception
We investigated deep water changes in the Southern Ocean during the last glacial inception, in relationship to surface hydrology and global climatology, to better understand the mechanisms of the establishment of a glacial ocean circulation. Changes in benthic foraminiferal delta(13)C from three hig...
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ftarchimer:oai:archimer.ifremer.fr:31952 2023-05-15T13:50:49+02:00 Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception Govin, Aline Michel, Elisabeth Labeyrie, Laurent Waelbroeck, Claire Dewilde, Fabien Jansen, Eystein 2009-01 application/pdf https://archimer.ifremer.fr/doc/00208/31952/30375.pdf https://doi.org/10.1029/2008PA001603 https://archimer.ifremer.fr/doc/00208/31952/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00208/31952/30375.pdf doi:10.1029/2008PA001603 https://archimer.ifremer.fr/doc/00208/31952/ Copyright 2009 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2009-01 , Vol. 24 , N. PA1202 , P. 1-14 isotope substage 5E ice core interglacial period climate variability deep ocean Atlantic sea circulation temperature hemisphere text Publication info:eu-repo/semantics/article 2009 ftarchimer https://doi.org/10.1029/2008PA001603 2021-09-23T20:24:50Z We investigated deep water changes in the Southern Ocean during the last glacial inception, in relationship to surface hydrology and global climatology, to better understand the mechanisms of the establishment of a glacial ocean circulation. Changes in benthic foraminiferal delta(13)C from three high-resolution cores are compared and indicate decoupled intermediate and deep water changes in the Southern Ocean. From the comparison with records from the North Atlantic, South Atlantic, and the Southern Ocean, we show that the early southern deep water delta(13)C drop observed at the MIS 5.5-5.4 transition occurred before any significant reduction of North Atlantic Deep Water ventilation. We propose that this drop is linked to the northward expansion of poorly ventilated Antarctic Bottom Water (AABW) mass in the Southern Ocean. Associated with an early cooling in the high southern latitudes, the westerly winds and surface oceanic fronts would migrate equatorward, thus weakening the upwelling of Circumpolar Deep Waters. Reduced heat brought to Antarctic surface waters would enhance sea ice formation during winters and the deep convection of cold and poorly ventilated AABW. Article in Journal/Newspaper Antarc* Antarctic ice core North Atlantic Deep Water North Atlantic Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Southern Ocean Paleoceanography 24 1 n/a n/a |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
isotope substage 5E ice core interglacial period climate variability deep ocean Atlantic sea circulation temperature hemisphere |
spellingShingle |
isotope substage 5E ice core interglacial period climate variability deep ocean Atlantic sea circulation temperature hemisphere Govin, Aline Michel, Elisabeth Labeyrie, Laurent Waelbroeck, Claire Dewilde, Fabien Jansen, Eystein Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception |
topic_facet |
isotope substage 5E ice core interglacial period climate variability deep ocean Atlantic sea circulation temperature hemisphere |
description |
We investigated deep water changes in the Southern Ocean during the last glacial inception, in relationship to surface hydrology and global climatology, to better understand the mechanisms of the establishment of a glacial ocean circulation. Changes in benthic foraminiferal delta(13)C from three high-resolution cores are compared and indicate decoupled intermediate and deep water changes in the Southern Ocean. From the comparison with records from the North Atlantic, South Atlantic, and the Southern Ocean, we show that the early southern deep water delta(13)C drop observed at the MIS 5.5-5.4 transition occurred before any significant reduction of North Atlantic Deep Water ventilation. We propose that this drop is linked to the northward expansion of poorly ventilated Antarctic Bottom Water (AABW) mass in the Southern Ocean. Associated with an early cooling in the high southern latitudes, the westerly winds and surface oceanic fronts would migrate equatorward, thus weakening the upwelling of Circumpolar Deep Waters. Reduced heat brought to Antarctic surface waters would enhance sea ice formation during winters and the deep convection of cold and poorly ventilated AABW. |
format |
Article in Journal/Newspaper |
author |
Govin, Aline Michel, Elisabeth Labeyrie, Laurent Waelbroeck, Claire Dewilde, Fabien Jansen, Eystein |
author_facet |
Govin, Aline Michel, Elisabeth Labeyrie, Laurent Waelbroeck, Claire Dewilde, Fabien Jansen, Eystein |
author_sort |
Govin, Aline |
title |
Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception |
title_short |
Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception |
title_full |
Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception |
title_fullStr |
Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception |
title_full_unstemmed |
Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception |
title_sort |
evidence for northward expansion of antarctic bottom water mass in the southern ocean during the last glacial inception |
publisher |
Amer Geophysical Union |
publishDate |
2009 |
url |
https://archimer.ifremer.fr/doc/00208/31952/30375.pdf https://doi.org/10.1029/2008PA001603 https://archimer.ifremer.fr/doc/00208/31952/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic ice core North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic ice core North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2009-01 , Vol. 24 , N. PA1202 , P. 1-14 |
op_relation |
https://archimer.ifremer.fr/doc/00208/31952/30375.pdf doi:10.1029/2008PA001603 https://archimer.ifremer.fr/doc/00208/31952/ |
op_rights |
Copyright 2009 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2008PA001603 |
container_title |
Paleoceanography |
container_volume |
24 |
container_issue |
1 |
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n/a |
op_container_end_page |
n/a |
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1766254117806669824 |