Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate
The Atlantic meridional overturning circulation is an important global-scale oceanic circulation, and its changes may be responsible for past abrupt climate change events. By using two versions of a coupled climate model, here we show that the stability of this circulation depends not only on the ba...
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Online Access: | https://doi.org/10.1038/s43247-023-00916-0 |
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ftncar:oai:drupal-site.org:articles_26522 2024-06-23T07:51:47+00:00 Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate Hu, Aixue (author) Meehl, Gerald A. (author) Abe-Ouchi, Ayako (author) Han, Weiqing (author) Otto-Bliesner, Bette (author) He, Feng (author) Wu, Tongwen (author) Rosenbloom, Nan (author) Strand, Warren G. (author) Edwards, James (author) 2023-07-10 https://doi.org/10.1038/s43247-023-00916-0 en eng Communications Earth & Environment--Commun Earth Environ--2662-4435 articles:26522 doi:10.1038/s43247-023-00916-0 ark:/85065/d7x63rzc Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2023 ftncar https://doi.org/10.1038/s43247-023-00916-0 2024-05-27T14:15:41Z The Atlantic meridional overturning circulation is an important global-scale oceanic circulation, and its changes may be responsible for past abrupt climate change events. By using two versions of a coupled climate model, here we show that the stability of this circulation depends not only on the background climate, but also on the type of primary external forcing: freshwater vs. greenhouse gases. When freshwater forcing is dominant, hysteresis of this circulation (an abrupt collapse/reactivation) becomes possible only under simulated glacial conditions with closed Bering Strait. Under present day and future conditions, both freshwater and greenhouse gas forcings could collapse this circulation, but only greenhouse gas forcing produced a bi-stable equilibrium state comparable to abrupt climate change. Our results demonstrate that the Bering Strait status (open vs. closed) may facilitate or prohibit the existence of this circulation's hysteresis, irrespective of the background climate conditions, but is directly related to the primary forcing. 1852977 1947282 DE-SC0022070 Article in Journal/Newspaper Bering Strait OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Bering Strait Communications Earth & Environment 4 1 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
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ftncar |
language |
English |
description |
The Atlantic meridional overturning circulation is an important global-scale oceanic circulation, and its changes may be responsible for past abrupt climate change events. By using two versions of a coupled climate model, here we show that the stability of this circulation depends not only on the background climate, but also on the type of primary external forcing: freshwater vs. greenhouse gases. When freshwater forcing is dominant, hysteresis of this circulation (an abrupt collapse/reactivation) becomes possible only under simulated glacial conditions with closed Bering Strait. Under present day and future conditions, both freshwater and greenhouse gas forcings could collapse this circulation, but only greenhouse gas forcing produced a bi-stable equilibrium state comparable to abrupt climate change. Our results demonstrate that the Bering Strait status (open vs. closed) may facilitate or prohibit the existence of this circulation's hysteresis, irrespective of the background climate conditions, but is directly related to the primary forcing. 1852977 1947282 DE-SC0022070 |
author2 |
Hu, Aixue (author) Meehl, Gerald A. (author) Abe-Ouchi, Ayako (author) Han, Weiqing (author) Otto-Bliesner, Bette (author) He, Feng (author) Wu, Tongwen (author) Rosenbloom, Nan (author) Strand, Warren G. (author) Edwards, James (author) |
format |
Article in Journal/Newspaper |
title |
Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate |
spellingShingle |
Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate |
title_short |
Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate |
title_full |
Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate |
title_fullStr |
Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate |
title_full_unstemmed |
Dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate |
title_sort |
dichotomy between freshwater and heat flux effects on oceanic conveyor belt stability and global climate |
publishDate |
2023 |
url |
https://doi.org/10.1038/s43247-023-00916-0 |
geographic |
Bering Strait |
geographic_facet |
Bering Strait |
genre |
Bering Strait |
genre_facet |
Bering Strait |
op_relation |
Communications Earth & Environment--Commun Earth Environ--2662-4435 articles:26522 doi:10.1038/s43247-023-00916-0 ark:/85065/d7x63rzc |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.1038/s43247-023-00916-0 |
container_title |
Communications Earth & Environment |
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4 |
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1 |
_version_ |
1802642915018670080 |