Atlantic-Pacific seesaw and its role in outgassing CO 2 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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Online Access: | http://hdl.handle.net/1959.4/unsworks_13553 https://doi.org/10.1002/2013PA002542 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_13553 2024-05-12T07:56:33+00:00 Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events Menviel, L England, MH Meissner, KJ Mouchet, A Yu, J 2014-01-01 http://hdl.handle.net/1959.4/unsworks_13553 https://doi.org/10.1002/2013PA002542 unknown American Geophysical Union (AGU) http://purl.org/au-research/grants/arc/CE110001028 http://purl.org/au-research/grants/arc/FL100100214 http://purl.org/au-research/grants/arc/FT100100443 http://hdl.handle.net/1959.4/unsworks_13553 https://doi.org/10.1002/2013PA002542 metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ urn:ISSN:0883-8305 urn:ISSN:1944-9186 Paleoceanography, 29, 1, 58-70 anzsrc-for: 0402 Geochemistry anzsrc-for: 0405 Oceanography anzsrc-for: 0602 Ecology journal article http://purl.org/coar/resource_type/c_6501 2014 ftunswworks https://doi.org/10.1002/2013PA002542 2024-04-17T15:18:05Z 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. ©2013. American Geophysical Union. All Rights Reserved. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Antarctic Southern Ocean Pacific Paleoceanography 29 1 58 70 |
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UNSW Sydney (The University of New South Wales): UNSWorks |
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ftunswworks |
language |
unknown |
topic |
anzsrc-for: 0402 Geochemistry anzsrc-for: 0405 Oceanography anzsrc-for: 0602 Ecology |
spellingShingle |
anzsrc-for: 0402 Geochemistry anzsrc-for: 0405 Oceanography anzsrc-for: 0602 Ecology Menviel, L England, MH Meissner, KJ Mouchet, A Yu, J Atlantic-Pacific seesaw and its role in outgassing CO 2 during Heinrich events |
topic_facet |
anzsrc-for: 0402 Geochemistry anzsrc-for: 0405 Oceanography anzsrc-for: 0602 Ecology |
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. ©2013. American Geophysical Union. All Rights Reserved. |
format |
Article in Journal/Newspaper |
author |
Menviel, L England, MH Meissner, KJ Mouchet, A Yu, J |
author_facet |
Menviel, L England, MH Meissner, KJ 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 |
publisher |
American Geophysical Union (AGU) |
publishDate |
2014 |
url |
http://hdl.handle.net/1959.4/unsworks_13553 https://doi.org/10.1002/2013PA002542 |
geographic |
Antarctic Southern Ocean Pacific |
geographic_facet |
Antarctic Southern Ocean Pacific |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
urn:ISSN:0883-8305 urn:ISSN:1944-9186 Paleoceanography, 29, 1, 58-70 |
op_relation |
http://purl.org/au-research/grants/arc/CE110001028 http://purl.org/au-research/grants/arc/FL100100214 http://purl.org/au-research/grants/arc/FT100100443 http://hdl.handle.net/1959.4/unsworks_13553 https://doi.org/10.1002/2013PA002542 |
op_rights |
metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ |
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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1798836686017265664 |