Global impacts of recent Southern Ocean cooling
Since the beginning of the satellite era, Southern Ocean sea surface temperatures (SSTs) have cooled, despite global warming. While observed Southern Ocean cooling has pre-viously been reported to have minimal impact on the tropical Pacific, the efficiency of this teleconnection has recently shown t...
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Online Access: | https://doi.org/10.1073/pnas.2300881120 |
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ftncar:oai:drupal-site.org:articles_26599 2023-10-25T01:28:31+02:00 Global impacts of recent Southern Ocean cooling Kang, Sarah M. (author) Yu, Yue (author) Deser, Clara (author) Zhang, Xiyue (author) Kang, In-Sik (author) Lee, Sun-Seon (author) Rodgers, Keith B. (author) Ceppi, Paulo (author) 2023-07-25 https://doi.org/10.1073/pnas.2300881120 en eng Proceedings of the National Academy of Sciences--Proc. Natl. Acad. Sci. U.S.A.--0027-8424--1091-6490 articles:26599 doi:10.1073/pnas.2300881120 ark:/85065/d70c50tk Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2023 ftncar https://doi.org/10.1073/pnas.2300881120 2023-09-25T18:18:20Z Since the beginning of the satellite era, Southern Ocean sea surface temperatures (SSTs) have cooled, despite global warming. While observed Southern Ocean cooling has pre-viously been reported to have minimal impact on the tropical Pacific, the efficiency of this teleconnection has recently shown to be mediated by subtropical cloud feedbacks that are highly model-dependent. Here, we conduct a coupled model intercomparison of paired ensemble simulations under historical radiative forcing: one with freely evolving SSTs and the other with Southern Ocean SST anomalies constrained to follow observa-tions. We reveal a global impact of observed Southern Ocean cooling in the model with stronger (and more realistic) cloud feedbacks, including Antarctic sea-ice expansion, southeastern tropical Pacific cooling, northward-shifted Hadley circulation, Aleutian low weakening, and North Pacific warming. Our results therefore suggest that observed Southern Ocean SST decrease might have contributed to cooler conditions in the eastern tropical Pacific in recent decades. Article in Journal/Newspaper aleutian low Antarc* Antarctic Sea ice Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Pacific Southern Ocean Proceedings of the National Academy of Sciences 120 30 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Since the beginning of the satellite era, Southern Ocean sea surface temperatures (SSTs) have cooled, despite global warming. While observed Southern Ocean cooling has pre-viously been reported to have minimal impact on the tropical Pacific, the efficiency of this teleconnection has recently shown to be mediated by subtropical cloud feedbacks that are highly model-dependent. Here, we conduct a coupled model intercomparison of paired ensemble simulations under historical radiative forcing: one with freely evolving SSTs and the other with Southern Ocean SST anomalies constrained to follow observa-tions. We reveal a global impact of observed Southern Ocean cooling in the model with stronger (and more realistic) cloud feedbacks, including Antarctic sea-ice expansion, southeastern tropical Pacific cooling, northward-shifted Hadley circulation, Aleutian low weakening, and North Pacific warming. Our results therefore suggest that observed Southern Ocean SST decrease might have contributed to cooler conditions in the eastern tropical Pacific in recent decades. |
author2 |
Kang, Sarah M. (author) Yu, Yue (author) Deser, Clara (author) Zhang, Xiyue (author) Kang, In-Sik (author) Lee, Sun-Seon (author) Rodgers, Keith B. (author) Ceppi, Paulo (author) |
format |
Article in Journal/Newspaper |
title |
Global impacts of recent Southern Ocean cooling |
spellingShingle |
Global impacts of recent Southern Ocean cooling |
title_short |
Global impacts of recent Southern Ocean cooling |
title_full |
Global impacts of recent Southern Ocean cooling |
title_fullStr |
Global impacts of recent Southern Ocean cooling |
title_full_unstemmed |
Global impacts of recent Southern Ocean cooling |
title_sort |
global impacts of recent southern ocean cooling |
publishDate |
2023 |
url |
https://doi.org/10.1073/pnas.2300881120 |
geographic |
Antarctic Pacific Southern Ocean |
geographic_facet |
Antarctic Pacific Southern Ocean |
genre |
aleutian low Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
aleutian low Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
Proceedings of the National Academy of Sciences--Proc. Natl. Acad. Sci. U.S.A.--0027-8424--1091-6490 articles:26599 doi:10.1073/pnas.2300881120 ark:/85065/d70c50tk |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.1073/pnas.2300881120 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
120 |
container_issue |
30 |
_version_ |
1780727351930257408 |