The influence of variability in meridional over turning on global ocean circulation
The Atlantic meridional overturning circulation (AMOC) is an important global-scale circulation and changes in AMOC can induce significant regional and global climate impacts. Here we study the stability of AMOC and its influence on global ocean circulation and the surface climate though analyzing a...
Published in: | Journal of Climate |
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Language: | English |
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2021
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Online Access: | https://doi.org/10.1175/JCLI-D-21-0119.1 |
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ftncar:oai:drupal-site.org:articles_25115 2024-04-14T08:09:51+00:00 The influence of variability in meridional over turning on global ocean circulation Hu, Aixue (author) Meehl, Gerald A. (author) Rosenbloom, Nan (author) Molina, Maria J. (author) Strand, Warren. G. (author) 2021-09 https://doi.org/10.1175/JCLI-D-21-0119.1 en eng Journal of Climate--0894-8755--1520-0442 Atlantic meridional overturning circulation observed by the RAPID-MOCHA-WBTS (RAPID-Meridional Overturning Circulation and Heatflux Array-Western Boundary Time Series) array at 26N from 2004 to 2018.--10.5285/8cd7e7bb-9a20-05d8-e053-6c86abc012c2 articles:25115 doi:10.1175/JCLI-D-21-0119.1 ark:/85065/d72b92jm Copyright 2021 American Meteorological Society (AMS). article Text 2021 ftncar https://doi.org/10.1175/JCLI-D-21-0119.1 2024-03-21T18:00:26Z The Atlantic meridional overturning circulation (AMOC) is an important global-scale circulation and changes in AMOC can induce significant regional and global climate impacts. Here we study the stability of AMOC and its influence on global ocean circulation and the surface climate though analyzing a set of sensitivity experiments using the Community Earth System Model version 1 (CESM1). Results show that a collapsed AMOC can induce changes in global ocean circulation, such as reduced (or reversed) Bering Strait transport and weakened Indonesian Throughflow and Agulhas Current, but strengthened Drake Passage transport. It also changes the global wind pattern and surface temperature, such as a seesaw-like surface temperature change between Northern and Southern Hemispheres, a weakening of the Indian-Australian summer monsoon, and a southward shift of the Southern Ocean westerlies. We also found that AMOC and the Pacific deep meridional overturning circulation (PMOC) do not form a natural seesaw under modern-day climate and geography. A collapsed AMOC (active PMOC) is not stable under modern conditions if there is no additional freshwater (salt) input in the subpolar North Atlantic (Pacific), suggesting that the modern mean state of AMOC (PMOC) does not depend on local haline forcing although its variability and changes do. 1844590 Article in Journal/Newspaper Bering Strait Drake Passage North Atlantic Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Southern Ocean Drake Passage Bering Strait Pacific Indian Journal of Climate 1 53 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The Atlantic meridional overturning circulation (AMOC) is an important global-scale circulation and changes in AMOC can induce significant regional and global climate impacts. Here we study the stability of AMOC and its influence on global ocean circulation and the surface climate though analyzing a set of sensitivity experiments using the Community Earth System Model version 1 (CESM1). Results show that a collapsed AMOC can induce changes in global ocean circulation, such as reduced (or reversed) Bering Strait transport and weakened Indonesian Throughflow and Agulhas Current, but strengthened Drake Passage transport. It also changes the global wind pattern and surface temperature, such as a seesaw-like surface temperature change between Northern and Southern Hemispheres, a weakening of the Indian-Australian summer monsoon, and a southward shift of the Southern Ocean westerlies. We also found that AMOC and the Pacific deep meridional overturning circulation (PMOC) do not form a natural seesaw under modern-day climate and geography. A collapsed AMOC (active PMOC) is not stable under modern conditions if there is no additional freshwater (salt) input in the subpolar North Atlantic (Pacific), suggesting that the modern mean state of AMOC (PMOC) does not depend on local haline forcing although its variability and changes do. 1844590 |
author2 |
Hu, Aixue (author) Meehl, Gerald A. (author) Rosenbloom, Nan (author) Molina, Maria J. (author) Strand, Warren. G. (author) |
format |
Article in Journal/Newspaper |
title |
The influence of variability in meridional over turning on global ocean circulation |
spellingShingle |
The influence of variability in meridional over turning on global ocean circulation |
title_short |
The influence of variability in meridional over turning on global ocean circulation |
title_full |
The influence of variability in meridional over turning on global ocean circulation |
title_fullStr |
The influence of variability in meridional over turning on global ocean circulation |
title_full_unstemmed |
The influence of variability in meridional over turning on global ocean circulation |
title_sort |
influence of variability in meridional over turning on global ocean circulation |
publishDate |
2021 |
url |
https://doi.org/10.1175/JCLI-D-21-0119.1 |
geographic |
Southern Ocean Drake Passage Bering Strait Pacific Indian |
geographic_facet |
Southern Ocean Drake Passage Bering Strait Pacific Indian |
genre |
Bering Strait Drake Passage North Atlantic Southern Ocean |
genre_facet |
Bering Strait Drake Passage North Atlantic Southern Ocean |
op_relation |
Journal of Climate--0894-8755--1520-0442 Atlantic meridional overturning circulation observed by the RAPID-MOCHA-WBTS (RAPID-Meridional Overturning Circulation and Heatflux Array-Western Boundary Time Series) array at 26N from 2004 to 2018.--10.5285/8cd7e7bb-9a20-05d8-e053-6c86abc012c2 articles:25115 doi:10.1175/JCLI-D-21-0119.1 ark:/85065/d72b92jm |
op_rights |
Copyright 2021 American Meteorological Society (AMS). |
op_doi |
https://doi.org/10.1175/JCLI-D-21-0119.1 |
container_title |
Journal of Climate |
container_start_page |
1 |
op_container_end_page |
53 |
_version_ |
1796307335243628544 |