Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model

Abstract The Southern Ocean exerts a strong influence on global climate, regulating the storage and transport of heat, freshwater and carbon throughout the world’s oceans. While the majority of previous studies focus on how wind changes influence Southern Ocean circulation patterns, here we set out...

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Autores principales:	Ariaan Purich, Ghyslaine Boschat, Giovanni Liguori
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fe8defd7c2474c9ab8bbc615bb4830e9
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spelling	oai:doaj.org-article:fe8defd7c2474c9ab8bbc615bb4830e92021-11-14T12:21:46ZAssessing the impact of suppressing Southern Ocean SST variability in a coupled climate model10.1038/s41598-021-01306-22045-2322https://doaj.org/article/fe8defd7c2474c9ab8bbc615bb4830e92021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01306-2https://doaj.org/toc/2045-2322Abstract The Southern Ocean exerts a strong influence on global climate, regulating the storage and transport of heat, freshwater and carbon throughout the world’s oceans. While the majority of previous studies focus on how wind changes influence Southern Ocean circulation patterns, here we set out to explore potential feedbacks from the ocean to the atmosphere. To isolate the role of oceanic variability on Southern Hemisphere climate, we perform coupled climate model experiments in which Southern Ocean variability is suppressed by restoring sea surface temperatures (SST) over 40°–65°S to the model’s monthly mean climatology. We find that suppressing Southern Ocean SST variability does not impact the Southern Annular Mode, suggesting air–sea feedbacks do not play an important role in the persistence of the Southern Annular Mode in our model. Suppressing Southern Ocean SST variability does lead to robust mean-state changes in SST and sea ice. Changes in mixed layer processes and convection associated with the SST restoring lead to SST warming and a sea ice decline in southern high latitudes, and SST cooling in midlatitudes. These results highlight the impact non-linear processes can have on a model’s mean state, and the need to consider these when performing simulations of the Southern Ocean.Ariaan PurichGhyslaine BoschatGiovanni LiguoriNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ariaan Purich Ghyslaine Boschat Giovanni Liguori Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model
description	Abstract The Southern Ocean exerts a strong influence on global climate, regulating the storage and transport of heat, freshwater and carbon throughout the world’s oceans. While the majority of previous studies focus on how wind changes influence Southern Ocean circulation patterns, here we set out to explore potential feedbacks from the ocean to the atmosphere. To isolate the role of oceanic variability on Southern Hemisphere climate, we perform coupled climate model experiments in which Southern Ocean variability is suppressed by restoring sea surface temperatures (SST) over 40°–65°S to the model’s monthly mean climatology. We find that suppressing Southern Ocean SST variability does not impact the Southern Annular Mode, suggesting air–sea feedbacks do not play an important role in the persistence of the Southern Annular Mode in our model. Suppressing Southern Ocean SST variability does lead to robust mean-state changes in SST and sea ice. Changes in mixed layer processes and convection associated with the SST restoring lead to SST warming and a sea ice decline in southern high latitudes, and SST cooling in midlatitudes. These results highlight the impact non-linear processes can have on a model’s mean state, and the need to consider these when performing simulations of the Southern Ocean.
format	article
author	Ariaan Purich Ghyslaine Boschat Giovanni Liguori
author_facet	Ariaan Purich Ghyslaine Boschat Giovanni Liguori
author_sort	Ariaan Purich
title	Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model
title_short	Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model
title_full	Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model
title_fullStr	Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model
title_full_unstemmed	Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model
title_sort	assessing the impact of suppressing southern ocean sst variability in a coupled climate model
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/fe8defd7c2474c9ab8bbc615bb4830e9
work_keys_str_mv	AT ariaanpurich assessingtheimpactofsuppressingsouthernoceansstvariabilityinacoupledclimatemodel AT ghyslaineboschat assessingtheimpactofsuppressingsouthernoceansstvariabilityinacoupledclimatemodel AT giovanniliguori assessingtheimpactofsuppressingsouthernoceansstvariabilityinacoupledclimatemodel
_version_	1718429267881099264

Assessing the impact of suppressing Southern Ocean SST variability in a coupled climate model

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