Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean
Abstract Abrupt climate warming events, known as Dansgaard-Oeschger events, occurred frequently during glacial periods, and are thought to be linked to changes in the Atlantic meridional overturning circulation. However, the mechanism responsible is not fully understood. Here, we present numerical s...
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2021
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Online Access: | http://dx.doi.org/10.1038/s43247-021-00226-3 https://www.nature.com/articles/s43247-021-00226-3.pdf https://www.nature.com/articles/s43247-021-00226-3 |
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crspringernat:10.1038/s43247-021-00226-3 2023-05-15T15:59:59+02:00 Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean Oka, Akira Abe-Ouchi, Ayako Sherriff-Tadano, Sam Yokoyama, Yusuke Kawamura, Kenji Hasumi, Hiroyasu MEXT | Japan Science and Technology Agency 2021 http://dx.doi.org/10.1038/s43247-021-00226-3 https://www.nature.com/articles/s43247-021-00226-3.pdf https://www.nature.com/articles/s43247-021-00226-3 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Communications Earth & Environment volume 2, issue 1 ISSN 2662-4435 General Earth and Planetary Sciences General Environmental Science journal-article 2021 crspringernat https://doi.org/10.1038/s43247-021-00226-3 2022-01-04T07:42:18Z Abstract Abrupt climate warming events, known as Dansgaard-Oeschger events, occurred frequently during glacial periods, and are thought to be linked to changes in the Atlantic meridional overturning circulation. However, the mechanism responsible is not fully understood. Here, we present numerical simulations with a sea-ice coupled ocean general circulation model that systematically investigate the thermal threshold where deep water formation, and hence the overturning circulation, shift abruptly when the sea surface cools or warms sufficiently. Specifically, in our simulations where the magnitude of the sea surface cooling is changed separately or simultaneously in the Northern and Southern Hemispheres, a prominent threshold is identified when the Southern Hemisphere is slightly warmer than during glacial maxima. Abrupt mode changes of the Atlantic Meridional Overturning Circulation, like those during Dansgaard-Oeschger events, occur past a threshold in a transient simulation where the Southern Hemisphere is gradually warmed. We propose that the Southern Ocean plays a role in controlling the thermal threshold of the Atlantic Meridional Overturning Circulation in a glacial climate and that Southern Ocean warming may have triggered Dansgaard-Oeschger events which occurred with long interval. Article in Journal/Newspaper Dansgaard-Oeschger events Sea ice Southern Ocean Springer Nature (via Crossref) Southern Ocean Communications Earth & Environment 2 1 |
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Springer Nature (via Crossref) |
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English |
topic |
General Earth and Planetary Sciences General Environmental Science |
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General Earth and Planetary Sciences General Environmental Science Oka, Akira Abe-Ouchi, Ayako Sherriff-Tadano, Sam Yokoyama, Yusuke Kawamura, Kenji Hasumi, Hiroyasu Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean |
topic_facet |
General Earth and Planetary Sciences General Environmental Science |
description |
Abstract Abrupt climate warming events, known as Dansgaard-Oeschger events, occurred frequently during glacial periods, and are thought to be linked to changes in the Atlantic meridional overturning circulation. However, the mechanism responsible is not fully understood. Here, we present numerical simulations with a sea-ice coupled ocean general circulation model that systematically investigate the thermal threshold where deep water formation, and hence the overturning circulation, shift abruptly when the sea surface cools or warms sufficiently. Specifically, in our simulations where the magnitude of the sea surface cooling is changed separately or simultaneously in the Northern and Southern Hemispheres, a prominent threshold is identified when the Southern Hemisphere is slightly warmer than during glacial maxima. Abrupt mode changes of the Atlantic Meridional Overturning Circulation, like those during Dansgaard-Oeschger events, occur past a threshold in a transient simulation where the Southern Hemisphere is gradually warmed. We propose that the Southern Ocean plays a role in controlling the thermal threshold of the Atlantic Meridional Overturning Circulation in a glacial climate and that Southern Ocean warming may have triggered Dansgaard-Oeschger events which occurred with long interval. |
author2 |
MEXT | Japan Science and Technology Agency |
format |
Article in Journal/Newspaper |
author |
Oka, Akira Abe-Ouchi, Ayako Sherriff-Tadano, Sam Yokoyama, Yusuke Kawamura, Kenji Hasumi, Hiroyasu |
author_facet |
Oka, Akira Abe-Ouchi, Ayako Sherriff-Tadano, Sam Yokoyama, Yusuke Kawamura, Kenji Hasumi, Hiroyasu |
author_sort |
Oka, Akira |
title |
Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean |
title_short |
Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean |
title_full |
Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean |
title_fullStr |
Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean |
title_full_unstemmed |
Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean |
title_sort |
glacial mode shift of the atlantic meridional overturning circulation by warming over the southern ocean |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1038/s43247-021-00226-3 https://www.nature.com/articles/s43247-021-00226-3.pdf https://www.nature.com/articles/s43247-021-00226-3 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Dansgaard-Oeschger events Sea ice Southern Ocean |
genre_facet |
Dansgaard-Oeschger events Sea ice Southern Ocean |
op_source |
Communications Earth & Environment volume 2, issue 1 ISSN 2662-4435 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s43247-021-00226-3 |
container_title |
Communications Earth & Environment |
container_volume |
2 |
container_issue |
1 |
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1766395863520772096 |