Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry
As the major sink of anthropogenic heat, the Southern Ocean has shown quasi -symmetric, deep -reaching warming since the mid -twentieth century. In comparison, the shorter -term heat storage pattern of the Southern Ocean is more complex and has notable impacts on regional climate and marine ecosyste...
Published in: | Journal of Climate |
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2024
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Online Access: | https://doi.org/10.1175/JCLI-D-23-0649.1 |
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ftncar:oai:drupal-site.org:articles_27233 2024-06-23T07:56:53+00:00 Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry Song, Yuanyuan (author) Li, Yuanlong (author) Hu, Aixue (author) Cheng, Lijing (author) Forget, Gaël (author) Chen, Xiaodan (author) Duan, Jing (author) Wang, Fan (author) 2024-06-01 https://doi.org/10.1175/JCLI-D-23-0649.1 unknown Journal of Climate--0894-8755--1520-0442 articles:27233 doi:10.1175/JCLI-D-23-0649.1 ark:/85065/d7sb49zh article 2024 ftncar https://doi.org/10.1175/JCLI-D-23-0649.1 2024-06-10T14:09:13Z As the major sink of anthropogenic heat, the Southern Ocean has shown quasi -symmetric, deep -reaching warming since the mid -twentieth century. In comparison, the shorter -term heat storage pattern of the Southern Ocean is more complex and has notable impacts on regional climate and marine ecosystems. By analyzing observational datasets and climate model simulations, this study reveals that the Southern Ocean exhibits prominent decadal ( . 8 years) variability extending to 700-m depth and is characterized by out -of -phase changes in the Paci fi c and Atlantic - Indian Ocean sectors. Changes in the Paci fi c sector are larger in magnitude than those in the Atlantic - Indian Ocean sectors and dominate the total heat storage of the Southern Ocean on decadal time scales. Instead of heat uptake through surface heat fl uxes, these asymmetric variations arise primarily from wind -driven heat redistribution. Pacemaker and preindustrial simulations of the Community Earth System Model version 1 (CESM1) suggest that these variations in Southern Ocean winds arise primarily from natural variability of the tropical Paci fi c, as represented by the interdecadal Paci fi c oscillation (IPO). Through atmospheric teleconnection, the positive phase of the IPO gives rise to higher -than -normal sea level pressure and anticyclonic wind anomalies in the 50 degrees - 70 degrees S band of the Paci fi c sector. These winds lead to warming of 0 - 700 m by driving the convergence of warm water. The opposite processes, involving cyclonic winds and upper -layer divergence, occur in the Atlantic - Indian Ocean sector. These fi ndings aid our understanding of the time -varying heat storage of the Southern Ocean and provide useful implications on initialized decadal climate prediction. 1852977 1947282 DE-SC0022070 Article in Journal/Newspaper Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Indian Southern Ocean Journal of Climate 37 11 3117 3132 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
unknown |
description |
As the major sink of anthropogenic heat, the Southern Ocean has shown quasi -symmetric, deep -reaching warming since the mid -twentieth century. In comparison, the shorter -term heat storage pattern of the Southern Ocean is more complex and has notable impacts on regional climate and marine ecosystems. By analyzing observational datasets and climate model simulations, this study reveals that the Southern Ocean exhibits prominent decadal ( . 8 years) variability extending to 700-m depth and is characterized by out -of -phase changes in the Paci fi c and Atlantic - Indian Ocean sectors. Changes in the Paci fi c sector are larger in magnitude than those in the Atlantic - Indian Ocean sectors and dominate the total heat storage of the Southern Ocean on decadal time scales. Instead of heat uptake through surface heat fl uxes, these asymmetric variations arise primarily from wind -driven heat redistribution. Pacemaker and preindustrial simulations of the Community Earth System Model version 1 (CESM1) suggest that these variations in Southern Ocean winds arise primarily from natural variability of the tropical Paci fi c, as represented by the interdecadal Paci fi c oscillation (IPO). Through atmospheric teleconnection, the positive phase of the IPO gives rise to higher -than -normal sea level pressure and anticyclonic wind anomalies in the 50 degrees - 70 degrees S band of the Paci fi c sector. These winds lead to warming of 0 - 700 m by driving the convergence of warm water. The opposite processes, involving cyclonic winds and upper -layer divergence, occur in the Atlantic - Indian Ocean sector. These fi ndings aid our understanding of the time -varying heat storage of the Southern Ocean and provide useful implications on initialized decadal climate prediction. 1852977 1947282 DE-SC0022070 |
author2 |
Song, Yuanyuan (author) Li, Yuanlong (author) Hu, Aixue (author) Cheng, Lijing (author) Forget, Gaël (author) Chen, Xiaodan (author) Duan, Jing (author) Wang, Fan (author) |
format |
Article in Journal/Newspaper |
title |
Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry |
spellingShingle |
Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry |
title_short |
Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry |
title_full |
Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry |
title_fullStr |
Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry |
title_full_unstemmed |
Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry |
title_sort |
decadal thermal variability of the upper southern ocean: zonal asymmetry |
publishDate |
2024 |
url |
https://doi.org/10.1175/JCLI-D-23-0649.1 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Journal of Climate--0894-8755--1520-0442 articles:27233 doi:10.1175/JCLI-D-23-0649.1 ark:/85065/d7sb49zh |
op_doi |
https://doi.org/10.1175/JCLI-D-23-0649.1 |
container_title |
Journal of Climate |
container_volume |
37 |
container_issue |
11 |
container_start_page |
3117 |
op_container_end_page |
3132 |
_version_ |
1802650260577714176 |