Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions
We use a carbon cycle model coupled to an ocean general circulation model to explore the links between sea surface boundary conditions, the deep-sea circulation, and the distribution of paleonutrient tracers (delta(13)C and Cd/Ca) from Last Glacial Maximum (21,000 B.P.) sediments. A glacial flow fie...
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Language: | English |
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Amer Geophysical Union
1999
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Online Access: | https://archimer.ifremer.fr/doc/00239/35061/34595.pdf https://doi.org/10.1029/1999PA900002 https://archimer.ifremer.fr/doc/00239/35061/ |
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ftarchimer:oai:archimer.ifremer.fr:35061 2023-05-15T17:29:55+02:00 Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions Winguth, Ame Archer, D Duplessy, Jc Maier-reimer, E Mikolajewicz, U 1999-06 application/pdf https://archimer.ifremer.fr/doc/00239/35061/34595.pdf https://doi.org/10.1029/1999PA900002 https://archimer.ifremer.fr/doc/00239/35061/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00239/35061/34595.pdf doi:10.1029/1999PA900002 https://archimer.ifremer.fr/doc/00239/35061/ 1999 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 1999-06 , Vol. 14 , N. 3 , P. 304-323 text Publication info:eu-repo/semantics/article 1999 ftarchimer https://doi.org/10.1029/1999PA900002 2021-09-23T20:25:32Z We use a carbon cycle model coupled to an ocean general circulation model to explore the links between sea surface boundary conditions, the deep-sea circulation, and the distribution of paleonutrient tracers (delta(13)C and Cd/Ca) from Last Glacial Maximum (21,000 B.P.) sediments. A glacial flow field with a shallower and 50% reduced North Atlantic overturning circulation generally reproduces the tracer data but cannot explain the strong glacial-interglacial shift in delta(13)C in the Southern Ocean. Sensitivity experiments with changes of +/-1 in salinity in the glacial salinity boundary fields show circulation patterns ranging from even stronger than the present day one to nearly a shutdown of the Atlantic deep-sea circulation. Our model results indicate that the overturning in the North Atlantic is linearly related to the zonal wind forcing in the Southern Ocean but with half of the sensitivity of Toggweiler and Samuels [1993]. Atmospheric pCO(2) appears to be insensitive to changing circulation and sea surface forcing; a tropical cooling of 4 degrees C can only explain 8% of the glacial-interglacial pCO(2) change documented in ice cores. Article in Journal/Newspaper North Atlantic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Southern Ocean Paleoceanography 14 3 304 323 |
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 |
description |
We use a carbon cycle model coupled to an ocean general circulation model to explore the links between sea surface boundary conditions, the deep-sea circulation, and the distribution of paleonutrient tracers (delta(13)C and Cd/Ca) from Last Glacial Maximum (21,000 B.P.) sediments. A glacial flow field with a shallower and 50% reduced North Atlantic overturning circulation generally reproduces the tracer data but cannot explain the strong glacial-interglacial shift in delta(13)C in the Southern Ocean. Sensitivity experiments with changes of +/-1 in salinity in the glacial salinity boundary fields show circulation patterns ranging from even stronger than the present day one to nearly a shutdown of the Atlantic deep-sea circulation. Our model results indicate that the overturning in the North Atlantic is linearly related to the zonal wind forcing in the Southern Ocean but with half of the sensitivity of Toggweiler and Samuels [1993]. Atmospheric pCO(2) appears to be insensitive to changing circulation and sea surface forcing; a tropical cooling of 4 degrees C can only explain 8% of the glacial-interglacial pCO(2) change documented in ice cores. |
format |
Article in Journal/Newspaper |
author |
Winguth, Ame Archer, D Duplessy, Jc Maier-reimer, E Mikolajewicz, U |
spellingShingle |
Winguth, Ame Archer, D Duplessy, Jc Maier-reimer, E Mikolajewicz, U Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions |
author_facet |
Winguth, Ame Archer, D Duplessy, Jc Maier-reimer, E Mikolajewicz, U |
author_sort |
Winguth, Ame |
title |
Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions |
title_short |
Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions |
title_full |
Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions |
title_fullStr |
Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions |
title_full_unstemmed |
Sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions |
title_sort |
sensitivity of paleonutrient tracer distributions and deep-sea circulation to glacial boundary conditions |
publisher |
Amer Geophysical Union |
publishDate |
1999 |
url |
https://archimer.ifremer.fr/doc/00239/35061/34595.pdf https://doi.org/10.1029/1999PA900002 https://archimer.ifremer.fr/doc/00239/35061/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 1999-06 , Vol. 14 , N. 3 , P. 304-323 |
op_relation |
https://archimer.ifremer.fr/doc/00239/35061/34595.pdf doi:10.1029/1999PA900002 https://archimer.ifremer.fr/doc/00239/35061/ |
op_rights |
1999 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/1999PA900002 |
container_title |
Paleoceanography |
container_volume |
14 |
container_issue |
3 |
container_start_page |
304 |
op_container_end_page |
323 |
_version_ |
1766125161372712960 |