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...
Published in: | Paleoceanography |
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Online Access: | http://hdl.handle.net/1885/34999 https://doi.org/10.1002/2013PA002542 https://openresearch-repository.anu.edu.au/bitstream/1885/34999/5/Yu_J_2013_Atlantic-Pacific_seesaw.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/34999/7/01_Menviel_Atlantic-Pacific_seesaw_and_2013.pdf.jpg |
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/34999 2024-01-14T10:01:37+01:00 Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events Menviel, L England, Matthew Heathcote Meissner, K.J. Mouchet, A.T. Yu, Jimin http://hdl.handle.net/1885/34999 https://doi.org/10.1002/2013PA002542 https://openresearch-repository.anu.edu.au/bitstream/1885/34999/5/Yu_J_2013_Atlantic-Pacific_seesaw.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/34999/7/01_Menviel_Atlantic-Pacific_seesaw_and_2013.pdf.jpg unknown American Geophysical Union 0883-8305 http://hdl.handle.net/1885/34999 doi:10.1002/2013PA002542 https://openresearch-repository.anu.edu.au/bitstream/1885/34999/5/Yu_J_2013_Atlantic-Pacific_seesaw.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/34999/7/01_Menviel_Atlantic-Pacific_seesaw_and_2013.pdf.jpg Paleoceanography Journal article ftanucanberra https://doi.org/10.1002/2013PA002542 2023-12-15T09:36:23Z 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 Australian National University: ANU Digital Collections Antarctic Southern Ocean Pacific Paleoceanography 29 1 58 70 |
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Australian National University: ANU Digital Collections |
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unknown |
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, Matthew Heathcote Meissner, K.J. Mouchet, A.T. Yu, Jimin |
spellingShingle |
Menviel, L England, Matthew Heathcote Meissner, K.J. Mouchet, A.T. Yu, Jimin Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events |
author_facet |
Menviel, L England, Matthew Heathcote Meissner, K.J. Mouchet, A.T. Yu, Jimin |
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 |
American Geophysical Union |
url |
http://hdl.handle.net/1885/34999 https://doi.org/10.1002/2013PA002542 https://openresearch-repository.anu.edu.au/bitstream/1885/34999/5/Yu_J_2013_Atlantic-Pacific_seesaw.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/34999/7/01_Menviel_Atlantic-Pacific_seesaw_and_2013.pdf.jpg |
geographic |
Antarctic Southern Ocean Pacific |
geographic_facet |
Antarctic Southern Ocean Pacific |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Paleoceanography |
op_relation |
0883-8305 http://hdl.handle.net/1885/34999 doi:10.1002/2013PA002542 https://openresearch-repository.anu.edu.au/bitstream/1885/34999/5/Yu_J_2013_Atlantic-Pacific_seesaw.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/34999/7/01_Menviel_Atlantic-Pacific_seesaw_and_2013.pdf.jpg |
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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1788067380804452352 |