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 previously been reported to have minimal impact on the tropical Pacific, the efficiency of this teleconnection has recently shown to...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2023-07, Vol.120 (30), p.e2300881120-e2300881120 |
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| container_end_page | e2300881120 |
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| container_issue | 30 |
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| container_title | Proceedings of the National Academy of Sciences - PNAS |
| container_volume | 120 |
| creator | Kang, Sarah M Yu, Yue Deser, Clara Zhang, Xiyue Kang, In-Sik Lee, Sun-Seon Rodgers, Keith B Ceppi, Paulo |
| 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 previously 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 observations. 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. |
| doi_str_mv | 10.1073/pnas.2300881120 |
| format | Article |
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While observed Southern Ocean cooling has previously 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 observations. 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.</description><identifier>ISSN: 0027-8424</identifier><identifier>EISSN: 1091-6490</identifier><identifier>DOI: 10.1073/pnas.2300881120</identifier><identifier>PMID: 37459536</identifier><language>eng</language><publisher>United States: National Academy of Sciences</publisher><subject>Anomalies ; Climate change ; Cooling ; Global warming ; Hadley circulation ; Physical Sciences ; Radiative forcing ; Sea surface temperature</subject><ispartof>Proceedings of the National Academy of Sciences - PNAS, 2023-07, Vol.120 (30), p.e2300881120-e2300881120</ispartof><rights>Copyright National Academy of Sciences Jul 25, 2023</rights><rights>Copyright © 2023 the Author(s). Published by PNAS. 2023</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c422t-292b2c1d752c1be8a014d1e19049e4142972c192b7d460ccc55fdef7965779473</citedby><cites>FETCH-LOGICAL-c422t-292b2c1d752c1be8a014d1e19049e4142972c192b7d460ccc55fdef7965779473</cites><orcidid>0000-0002-6465-8923 ; 0000-0002-5517-9103 ; 0000-0002-3754-3506 ; 0000-0003-4635-275X ; 0000-0003-1788-7261</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC10372617/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC10372617/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,315,728,781,785,886,27929,27930,53796,53798</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/37459536$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kang, Sarah M</creatorcontrib><creatorcontrib>Yu, Yue</creatorcontrib><creatorcontrib>Deser, Clara</creatorcontrib><creatorcontrib>Zhang, Xiyue</creatorcontrib><creatorcontrib>Kang, In-Sik</creatorcontrib><creatorcontrib>Lee, Sun-Seon</creatorcontrib><creatorcontrib>Rodgers, Keith B</creatorcontrib><creatorcontrib>Ceppi, Paulo</creatorcontrib><title>Global impacts of recent Southern Ocean cooling</title><title>Proceedings of the National Academy of Sciences - PNAS</title><addtitle>Proc Natl Acad Sci U S A</addtitle><description>Since the beginning of the satellite era, Southern Ocean sea surface temperatures (SSTs) have cooled, despite global warming. 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| source | PubMed Central; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry |
| subjects | Anomalies Climate change Cooling Global warming Hadley circulation Physical Sciences Radiative forcing Sea surface temperature |
| title | Global impacts of recent Southern Ocean cooling |
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