Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region
Studies from the subtropical western and eastern Atlantic Ocean, using the Pa-231/Th-230 ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this...
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Amer Geophysical Union
2009
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ftarchimer:oai:archimer.ifremer.fr:34468 2023-05-15T17:28:12+02:00 Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region Gherardi, Jeanne Marie Labeyrie, L. Nave, S. Francois, R. Mcmanus, J. F. Cortijo, E. 2009-05 application/pdf https://archimer.ifremer.fr/doc/00233/34468/32855.pdf https://archimer.ifremer.fr/doc/00233/34468/32856.pdf https://archimer.ifremer.fr/doc/00233/34468/32858.pdf https://doi.org/10.1029/2008PA001696 https://archimer.ifremer.fr/doc/00233/34468/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00233/34468/32855.pdf https://archimer.ifremer.fr/doc/00233/34468/32856.pdf https://archimer.ifremer.fr/doc/00233/34468/32858.pdf doi:10.1029/2008PA001696 https://archimer.ifremer.fr/doc/00233/34468/ Copyright 2009 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2009-05 , Vol. 24 , N. 2 / PA2204 , P. 1-14 MOC North Atlantic deglaciation 231Pa/230Th text Publication info:eu-repo/semantics/article 2009 ftarchimer https://doi.org/10.1029/2008PA001696 2021-09-23T20:25:21Z Studies from the subtropical western and eastern Atlantic Ocean, using the Pa-231/Th-230 ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this study, we present a compilation of existing and new sedimentary Pa-231/Th-230 records from North Atlantic cores between 1710 and 4550 m water depth. Comparing sedimentary Pa-231/Th-230 from different depths provides new insights into the evolution of the geometry and rate of deep water formation in the North Atlantic during the last 20,000 years. The Pa-231/Th-230 ratio measured in upper Holocene sediments indicates slow water renewal above similar to 2500 m and rapid flushing below, consistent with our understanding of modern circulation. In contrast, during the Last Glacial Maximum (LGM), Glacial North Atlantic Intermediate Water (GNAIW) drove a rapid overturning circulation to a depth of at least similar to 3000 m depth. Below similar to 4000 m, water renewal was much slower than today. At the onset of Heinrich event 1, transport by the overturning circulation declined at all depths. GNAIW shoaled above 3000 m and significantly weakened but did not totally shut down. During the Bolling-Allerod (BA) that followed, water renewal rates further decreased above 2000 m but increased below. Our results suggest for the first time that ocean circulation during that period was quite distinct from the modern circulation mode, with a comparatively higher renewal rate above 3000 m and a lower renewal rate below in a pattern similar to the LGM but less accentuated. MOC during the Younger Dryas appears very similar to BA down to 2000 m and slightly slower below. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Paleoceanography 24 2 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 |
MOC North Atlantic deglaciation 231Pa/230Th |
spellingShingle |
MOC North Atlantic deglaciation 231Pa/230Th Gherardi, Jeanne Marie Labeyrie, L. Nave, S. Francois, R. Mcmanus, J. F. Cortijo, E. Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region |
topic_facet |
MOC North Atlantic deglaciation 231Pa/230Th |
description |
Studies from the subtropical western and eastern Atlantic Ocean, using the Pa-231/Th-230 ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this study, we present a compilation of existing and new sedimentary Pa-231/Th-230 records from North Atlantic cores between 1710 and 4550 m water depth. Comparing sedimentary Pa-231/Th-230 from different depths provides new insights into the evolution of the geometry and rate of deep water formation in the North Atlantic during the last 20,000 years. The Pa-231/Th-230 ratio measured in upper Holocene sediments indicates slow water renewal above similar to 2500 m and rapid flushing below, consistent with our understanding of modern circulation. In contrast, during the Last Glacial Maximum (LGM), Glacial North Atlantic Intermediate Water (GNAIW) drove a rapid overturning circulation to a depth of at least similar to 3000 m depth. Below similar to 4000 m, water renewal was much slower than today. At the onset of Heinrich event 1, transport by the overturning circulation declined at all depths. GNAIW shoaled above 3000 m and significantly weakened but did not totally shut down. During the Bolling-Allerod (BA) that followed, water renewal rates further decreased above 2000 m but increased below. Our results suggest for the first time that ocean circulation during that period was quite distinct from the modern circulation mode, with a comparatively higher renewal rate above 3000 m and a lower renewal rate below in a pattern similar to the LGM but less accentuated. MOC during the Younger Dryas appears very similar to BA down to 2000 m and slightly slower below. |
format |
Article in Journal/Newspaper |
author |
Gherardi, Jeanne Marie Labeyrie, L. Nave, S. Francois, R. Mcmanus, J. F. Cortijo, E. |
author_facet |
Gherardi, Jeanne Marie Labeyrie, L. Nave, S. Francois, R. Mcmanus, J. F. Cortijo, E. |
author_sort |
Gherardi, Jeanne Marie |
title |
Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region |
title_short |
Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region |
title_full |
Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region |
title_fullStr |
Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region |
title_full_unstemmed |
Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region |
title_sort |
glacial-interglacial circulation changes inferred from pa-231/th-230 sedimentary record in the north atlantic region |
publisher |
Amer Geophysical Union |
publishDate |
2009 |
url |
https://archimer.ifremer.fr/doc/00233/34468/32855.pdf https://archimer.ifremer.fr/doc/00233/34468/32856.pdf https://archimer.ifremer.fr/doc/00233/34468/32858.pdf https://doi.org/10.1029/2008PA001696 https://archimer.ifremer.fr/doc/00233/34468/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2009-05 , Vol. 24 , N. 2 / PA2204 , P. 1-14 |
op_relation |
https://archimer.ifremer.fr/doc/00233/34468/32855.pdf https://archimer.ifremer.fr/doc/00233/34468/32856.pdf https://archimer.ifremer.fr/doc/00233/34468/32858.pdf doi:10.1029/2008PA001696 https://archimer.ifremer.fr/doc/00233/34468/ |
op_rights |
Copyright 2009 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2008PA001696 |
container_title |
Paleoceanography |
container_volume |
24 |
container_issue |
2 |
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n/a |
op_container_end_page |
n/a |
_version_ |
1766120740582588416 |