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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fttriple:oai:gotriple.eu:10670/1.e0eezp 2023-05-15T13:39:58+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. https://doi.org/10.1002/2013PA002542 https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf https://archimer.ifremer.fr/doc/00291/40227/ en eng Amer Geophysical Union doi:10.1002/2013PA002542 10670/1.e0eezp https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf https://archimer.ifremer.fr/doc/00291/40227/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-01 , Vol. 29 , N. 1 , P. 58-70 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1002/2013PA002542 2023-01-22T16:46:41Z 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. Text Antarc* Antarctic Southern Ocean Unknown Antarctic Pacific Southern Ocean Paleoceanography 29 1 58 70 |
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geo envir Menviel, L. England, M. H. Meissner, K. J. Mouchet, A. Yu, J. Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
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geo envir |
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 |
Text |
author |
Menviel, L. England, M. H. Meissner, K. J. Mouchet, A. Yu, J. |
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 |
url |
https://doi.org/10.1002/2013PA002542 https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf 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 |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-01 , Vol. 29 , N. 1 , P. 58-70 |
op_relation |
doi:10.1002/2013PA002542 10670/1.e0eezp https://archimer.ifremer.fr/doc/00291/40227/38679.pdf https://archimer.ifremer.fr/doc/00291/40227/38680.pdf https://archimer.ifremer.fr/doc/00291/40227/ |
op_rights |
other |
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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1766126476219908096 |