Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events
Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO2 increase. However, previous modeling studies display conflicting atmospheric CO2 responses to an AMOC shutdown. Here...
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ftarchimer:oai:archimer.ifremer.fr:40227 2023-05-15T13:50:50+02:00 Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events Menviel, L. England, M. H. Meissner, K. J. Mouchet, A. Yu, J. 2014-01 application/pdf https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf https://doi.org/10.1002/2013PA002542 https://archimer.ifremer.fr/doc/00291/40227/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf doi:10.1002/2013PA002542 https://archimer.ifremer.fr/doc/00291/40227/ 2013. American Geophysical Union. All Rights Reserved info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-01 , Vol. 29 , N. 1 , P. 58-70 text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1002/2013PA002542 2021-09-23T20:26:50Z Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO2 increase. However, previous modeling studies display conflicting atmospheric CO2 responses to an AMOC shutdown. Here we use model simulations combined with paleoproxy records to show that depending on the deep and bottom water transport in the Northern and Southern Pacific Ocean during an AMOC weakening, the ocean can act either as a sink or a source of carbon. Results from idealized meltwater experiments as well as from a transient experiment covering Heinrich stadial 4 suggest that a shutdown of the AMOC during Heinrich stadials 4 (HS4) and 1 (HS1) led to an enhancement of Antarctic Bottom Water (AABW) and North Pacific Deep Water (NPDW) transport. We show that enhanced deep and bottom water transport in the Pacific Ocean ventilates deep Pacific carbon through the Southern Ocean, thus contributing to a rise in atmospheric CO2. This mechanism yields a good agreement between paleoproxy records and modeling results, thus highlighting the possible establishment of an Atlantic-Pacific seesaw during Heinrich stadials. Enhanced AABW and NPDW transport could account for most of the observed atmospheric CO2 increase during HS4 and for about 30% of the atmospheric CO2 increase during HS1. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Pacific Southern Ocean Paleoceanography 29 1 58 70 |
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 |
Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO2 increase. However, previous modeling studies display conflicting atmospheric CO2 responses to an AMOC shutdown. Here we use model simulations combined with paleoproxy records to show that depending on the deep and bottom water transport in the Northern and Southern Pacific Ocean during an AMOC weakening, the ocean can act either as a sink or a source of carbon. Results from idealized meltwater experiments as well as from a transient experiment covering Heinrich stadial 4 suggest that a shutdown of the AMOC during Heinrich stadials 4 (HS4) and 1 (HS1) led to an enhancement of Antarctic Bottom Water (AABW) and North Pacific Deep Water (NPDW) transport. We show that enhanced deep and bottom water transport in the Pacific Ocean ventilates deep Pacific carbon through the Southern Ocean, thus contributing to a rise in atmospheric CO2. This mechanism yields a good agreement between paleoproxy records and modeling results, thus highlighting the possible establishment of an Atlantic-Pacific seesaw during Heinrich stadials. Enhanced AABW and NPDW transport could account for most of the observed atmospheric CO2 increase during HS4 and for about 30% of the atmospheric CO2 increase during HS1. |
format |
Article in Journal/Newspaper |
author |
Menviel, L. England, M. H. Meissner, K. J. Mouchet, A. Yu, J. |
spellingShingle |
Menviel, L. England, M. H. Meissner, K. J. Mouchet, A. Yu, J. Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
author_facet |
Menviel, L. England, M. H. Meissner, K. J. Mouchet, A. Yu, J. |
author_sort |
Menviel, L. |
title |
Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
title_short |
Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
title_full |
Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
title_fullStr |
Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
title_full_unstemmed |
Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
title_sort |
atlantic-pacific seesaw and its role in outgassing co2 during heinrich events |
publisher |
Amer Geophysical Union |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf https://doi.org/10.1002/2013PA002542 https://archimer.ifremer.fr/doc/00291/40227/ |
geographic |
Antarctic Pacific Southern Ocean |
geographic_facet |
Antarctic Pacific Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-01 , Vol. 29 , N. 1 , P. 58-70 |
op_relation |
https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf doi:10.1002/2013PA002542 https://archimer.ifremer.fr/doc/00291/40227/ |
op_rights |
2013. American Geophysical Union. All Rights Reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2013PA002542 |
container_title |
Paleoceanography |
container_volume |
29 |
container_issue |
1 |
container_start_page |
58 |
op_container_end_page |
70 |
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1766254145490124800 |