The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability
The upper branch of the Atlantic Meridional Overturning Circulation (AMOC) plays a critical role in ocean circulation and climate change, yet its variability during the last glacial period is poorly documented. Here, we investigate the northward‐flowing Glacial Eastern Boundary Current (GEBC) in the...
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Online Access: | https://doi.org/10.1029/2020PA004068 https://archimer.ifremer.fr/doc/00683/79488/82080.pdf https://archimer.ifremer.fr/doc/00683/79488/82081.docx |
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fttriple:oai:gotriple.eu:10670/1.1nffdy 2023-05-15T16:40:15+02:00 The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability Toucanne, Samuel Soulet, Guillaume Vazquez Riveiros, Natalia Boswell, Steven M. Dennielou, Bernard Waelbroeck, Claire Bayon, Germain Mojtahid, Meryem Bosq, Mathieu Sabine, Marjolaine Zaragosi, Sébastien Bourillet, Jean-francois Mercier, Herle https://doi.org/10.1029/2020PA004068 https://archimer.ifremer.fr/doc/00683/79488/82080.pdf https://archimer.ifremer.fr/doc/00683/79488/82081.docx en eng American Geophysical Union (AGU) doi:10.1029/2020PA004068 10670/1.1nffdy https://archimer.ifremer.fr/doc/00683/79488/82080.pdf https://archimer.ifremer.fr/doc/00683/79488/82081.docx other Archimer, archive institutionnelle de l'Ifremer Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-03 , Vol. 36 , N. 3 , P. e2020PA004068 (23p.) envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1029/2020PA004068 2023-01-22T17:11:54Z The upper branch of the Atlantic Meridional Overturning Circulation (AMOC) plays a critical role in ocean circulation and climate change, yet its variability during the last glacial period is poorly documented. Here, we investigate the northward‐flowing Glacial Eastern Boundary Current (GEBC) in the North Atlantic, known today as the European Slope Current, and representing the easternmost portion of the upper branch of the AMOC. Based on flow speed and isotopic records, we show that Dansgaard‐Oeschger (D/O) interstadials (stadials) correspond to a faster (weaker) GEBC during the ∼50‐15 ka period. This, by analogy to present‐day conditions, suggests enhanced (reduced) strength of the subpolar gyre and, by extension, of northern‐sourced water production and AMOC during D‐O interstadials (stadials). Concomitant fluctuations of both the GEBC and the European Ice Sheet between ∼30 and 17 ka suggest an active role of the upper branch of AMOC in the poleward transport of heat and freshwater to the northern North Atlantic, with direct impacts on deep water formation and AMOC strength. We explore these ice‐sheet ‐ AMOC interactions and the associated abrupt climate changes over the last glacial period and the last deglaciation. Text Ice Sheet North Atlantic Unknown Paleoceanography and Paleoclimatology 36 3 |
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language |
English |
topic |
envir geo |
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envir geo Toucanne, Samuel Soulet, Guillaume Vazquez Riveiros, Natalia Boswell, Steven M. Dennielou, Bernard Waelbroeck, Claire Bayon, Germain Mojtahid, Meryem Bosq, Mathieu Sabine, Marjolaine Zaragosi, Sébastien Bourillet, Jean-francois Mercier, Herle The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability |
topic_facet |
envir geo |
description |
The upper branch of the Atlantic Meridional Overturning Circulation (AMOC) plays a critical role in ocean circulation and climate change, yet its variability during the last glacial period is poorly documented. Here, we investigate the northward‐flowing Glacial Eastern Boundary Current (GEBC) in the North Atlantic, known today as the European Slope Current, and representing the easternmost portion of the upper branch of the AMOC. Based on flow speed and isotopic records, we show that Dansgaard‐Oeschger (D/O) interstadials (stadials) correspond to a faster (weaker) GEBC during the ∼50‐15 ka period. This, by analogy to present‐day conditions, suggests enhanced (reduced) strength of the subpolar gyre and, by extension, of northern‐sourced water production and AMOC during D‐O interstadials (stadials). Concomitant fluctuations of both the GEBC and the European Ice Sheet between ∼30 and 17 ka suggest an active role of the upper branch of AMOC in the poleward transport of heat and freshwater to the northern North Atlantic, with direct impacts on deep water formation and AMOC strength. We explore these ice‐sheet ‐ AMOC interactions and the associated abrupt climate changes over the last glacial period and the last deglaciation. |
format |
Text |
author |
Toucanne, Samuel Soulet, Guillaume Vazquez Riveiros, Natalia Boswell, Steven M. Dennielou, Bernard Waelbroeck, Claire Bayon, Germain Mojtahid, Meryem Bosq, Mathieu Sabine, Marjolaine Zaragosi, Sébastien Bourillet, Jean-francois Mercier, Herle |
author_facet |
Toucanne, Samuel Soulet, Guillaume Vazquez Riveiros, Natalia Boswell, Steven M. Dennielou, Bernard Waelbroeck, Claire Bayon, Germain Mojtahid, Meryem Bosq, Mathieu Sabine, Marjolaine Zaragosi, Sébastien Bourillet, Jean-francois Mercier, Herle |
author_sort |
Toucanne, Samuel |
title |
The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability |
title_short |
The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability |
title_full |
The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability |
title_fullStr |
The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability |
title_full_unstemmed |
The North Atlantic Glacial Eastern Boundary Current as a key driver for ice‐sheet – AMOC interactions and climate instability |
title_sort |
north atlantic glacial eastern boundary current as a key driver for ice‐sheet – amoc interactions and climate instability |
publisher |
American Geophysical Union (AGU) |
url |
https://doi.org/10.1029/2020PA004068 https://archimer.ifremer.fr/doc/00683/79488/82080.pdf https://archimer.ifremer.fr/doc/00683/79488/82081.docx |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-03 , Vol. 36 , N. 3 , P. e2020PA004068 (23p.) |
op_relation |
doi:10.1029/2020PA004068 10670/1.1nffdy https://archimer.ifremer.fr/doc/00683/79488/82080.pdf https://archimer.ifremer.fr/doc/00683/79488/82081.docx |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2020PA004068 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
3 |
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1766030625542766592 |