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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Amer Geophysical Union
2009
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Online Access: | https://doi.org/10.1029/2008PA001603 https://archimer.ifremer.fr/doc/00208/31952/30375.pdf https://archimer.ifremer.fr/doc/00208/31952/ |
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fttriple:oai:gotriple.eu:10670/1.8soan3 2023-05-15T13:57:06+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 2009-01-01 https://doi.org/10.1029/2008PA001603 https://archimer.ifremer.fr/doc/00208/31952/30375.pdf https://archimer.ifremer.fr/doc/00208/31952/ en eng Amer Geophysical Union doi:10.1029/2008PA001603 10670/1.8soan3 https://archimer.ifremer.fr/doc/00208/31952/30375.pdf https://archimer.ifremer.fr/doc/00208/31952/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2009-01 , Vol. 24 , N. PA1202 , P. 1-14 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2009 fttriple https://doi.org/10.1029/2008PA001603 2023-01-22T17:46:32Z 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. Text Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean Unknown Antarctic Southern Ocean Paleoceanography 24 1 n/a n/a |
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geo envir 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 |
geo envir |
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 |
Text |
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://doi.org/10.1029/2008PA001603 https://archimer.ifremer.fr/doc/00208/31952/30375.pdf https://archimer.ifremer.fr/doc/00208/31952/ |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2009-01 , Vol. 24 , N. PA1202 , P. 1-14 |
op_relation |
doi:10.1029/2008PA001603 10670/1.8soan3 https://archimer.ifremer.fr/doc/00208/31952/30375.pdf https://archimer.ifremer.fr/doc/00208/31952/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2008PA001603 |
container_title |
Paleoceanography |
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24 |
container_issue |
1 |
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n/a |
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n/a |
_version_ |
1766264708005888000 |