Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events
[1] Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO 2 increase. However, previous modeling studies display conflicting atmospheric CO 2 responses to an AMOC shutdown...
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ftvliz:oai:oma.vliz.be:247098 2023-05-15T13:59:38+02:00 Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events Menviel, L England, H Meissner, J Mouchet, A. Yu, J 2014 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=247098 en eng info:eu-repo/semantics/altIdentifier/wos/000337977700005 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/2013PA002542 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=247098 info:eu-repo/semantics/restrictedAccess %3Ci%3EPaleoceanography+29%281%29%3C%2Fi%3E%3A+58-70.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2F2013PA002542%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2F2013PA002542%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftvliz https://doi.org/10.1002/2013PA002542 2022-05-01T10:27:20Z [1] Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO 2 increase. However, previous modeling studies display conflicting atmospheric CO 2 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 CO 2 . 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 CO 2 increase during HS4 and for about 30% of the atmospheric CO 2 increase during HS1. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Antarctic Southern Ocean Pacific Paleoceanography 29 1 58 70 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
[1] Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO 2 increase. However, previous modeling studies display conflicting atmospheric CO 2 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 CO 2 . 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 CO 2 increase during HS4 and for about 30% of the atmospheric CO 2 increase during HS1. |
format |
Article in Journal/Newspaper |
author |
Menviel, L England, H Meissner, J Mouchet, A. Yu, J |
spellingShingle |
Menviel, L England, H Meissner, J Mouchet, A. Yu, J Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events |
author_facet |
Menviel, L England, H Meissner, J Mouchet, A. Yu, J |
author_sort |
Menviel, L |
title |
Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events |
title_short |
Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events |
title_full |
Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events |
title_fullStr |
Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events |
title_full_unstemmed |
Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events |
title_sort |
atlantic-pacific seesaw and its role in outgassing co 2 during heinrich events |
publishDate |
2014 |
url |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=247098 |
geographic |
Antarctic Southern Ocean Pacific |
geographic_facet |
Antarctic Southern Ocean Pacific |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
%3Ci%3EPaleoceanography+29%281%29%3C%2Fi%3E%3A+58-70.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2F2013PA002542%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2F2013PA002542%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000337977700005 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/2013PA002542 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=247098 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
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 |
_version_ |
1766268307381420032 |