Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity

The relationship between Atlantic meridional overturning circulation (AMOC) variability and high-latitude North Atlantic buoyancy changes is complicated by the latter both driving, and responding to, AMOC changes. A maximum covariance analysis applied to a 1,201-year preindustrial control simulation...

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Published in:Geophysical Research Letters
Main Authors: Chiang, JCH, Cheng, W, Kim, WM, Kim, S
Format: Article in Journal/Newspaper
Language:unknown
Published: eScholarship, University of California 2021
Subjects:
Online Access:https://escholarship.org/uc/item/9bk973wd
https://escholarship.org/content/qt9bk973wd/qt9bk973wd.pdf
https://doi.org/10.1029/2021gl093496
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spelling ftcdlib:oai:escholarship.org:ark:/13030/qt9bk973wd 2024-09-15T18:20:46+00:00 Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity Chiang, JCH Cheng, W Kim, WM Kim, S 2021-07-28 application/pdf https://escholarship.org/uc/item/9bk973wd https://escholarship.org/content/qt9bk973wd/qt9bk973wd.pdf https://doi.org/10.1029/2021gl093496 unknown eScholarship, University of California qt9bk973wd https://escholarship.org/uc/item/9bk973wd https://escholarship.org/content/qt9bk973wd/qt9bk973wd.pdf doi:10.1029/2021gl093496 public Geophysical Research Letters, vol 48, iss 14 Climate Action Life Below Water Meteorology & Atmospheric Sciences article 2021 ftcdlib https://doi.org/10.1029/2021gl093496 2024-06-28T06:28:20Z The relationship between Atlantic meridional overturning circulation (AMOC) variability and high-latitude North Atlantic buoyancy changes is complicated by the latter both driving, and responding to, AMOC changes. A maximum covariance analysis applied to a 1,201-year preindustrial control simulation reveals two leading modes that separate these two distinct roles of North Atlantic temperature and salinity as related to AMOC variability. A linear combination of the two modes accounts for most of the variation of a widely used AMOC index. The same analysis applied to another control simulation known to possess two distinct regimes of AMOC variability—oscillatory and red-noise—suggests that the North Atlantic buoyancy-forced AMOC variability is present in both regimes but is weaker in the latter, and moreover there is pronounced multidecadal/centennial AMOC behavior in the latter regime that is unrelated to North Atlantic buoyancy forcing. Article in Journal/Newspaper North Atlantic University of California: eScholarship Geophysical Research Letters 48 14
institution Open Polar
collection University of California: eScholarship
op_collection_id ftcdlib
language unknown
topic Climate Action
Life Below Water
Meteorology & Atmospheric Sciences
spellingShingle Climate Action
Life Below Water
Meteorology & Atmospheric Sciences
Chiang, JCH
Cheng, W
Kim, WM
Kim, S
Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity
topic_facet Climate Action
Life Below Water
Meteorology & Atmospheric Sciences
description The relationship between Atlantic meridional overturning circulation (AMOC) variability and high-latitude North Atlantic buoyancy changes is complicated by the latter both driving, and responding to, AMOC changes. A maximum covariance analysis applied to a 1,201-year preindustrial control simulation reveals two leading modes that separate these two distinct roles of North Atlantic temperature and salinity as related to AMOC variability. A linear combination of the two modes accounts for most of the variation of a widely used AMOC index. The same analysis applied to another control simulation known to possess two distinct regimes of AMOC variability—oscillatory and red-noise—suggests that the North Atlantic buoyancy-forced AMOC variability is present in both regimes but is weaker in the latter, and moreover there is pronounced multidecadal/centennial AMOC behavior in the latter regime that is unrelated to North Atlantic buoyancy forcing.
format Article in Journal/Newspaper
author Chiang, JCH
Cheng, W
Kim, WM
Kim, S
author_facet Chiang, JCH
Cheng, W
Kim, WM
Kim, S
author_sort Chiang, JCH
title Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity
title_short Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity
title_full Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity
title_fullStr Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity
title_full_unstemmed Untangling the Relationship Between AMOC Variability and North Atlantic Upper‐Ocean Temperature and Salinity
title_sort untangling the relationship between amoc variability and north atlantic upper‐ocean temperature and salinity
publisher eScholarship, University of California
publishDate 2021
url https://escholarship.org/uc/item/9bk973wd
https://escholarship.org/content/qt9bk973wd/qt9bk973wd.pdf
https://doi.org/10.1029/2021gl093496
genre North Atlantic
genre_facet North Atlantic
op_source Geophysical Research Letters, vol 48, iss 14
op_relation qt9bk973wd
https://escholarship.org/uc/item/9bk973wd
https://escholarship.org/content/qt9bk973wd/qt9bk973wd.pdf
doi:10.1029/2021gl093496
op_rights public
op_doi https://doi.org/10.1029/2021gl093496
container_title Geophysical Research Letters
container_volume 48
container_issue 14
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