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...
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Language: | English |
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AMER METEOROLOGICAL SOC
2024
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/185869 2024-09-15T17:48:49+00:00 Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry Song, Yuanyuan Li, Yuanlong Hu, Aixue Cheng, Lijing Forget, Gael Chen, Xiaodan Duan, Jing Wang, Fan 2024-06-01 http://ir.qdio.ac.cn/handle/337002/185869 https://doi.org/10.1175/JCLI-D-23-0649.1 英语 eng AMER METEOROLOGICAL SOC JOURNAL OF CLIMATE http://ir.qdio.ac.cn/handle/337002/185869 doi:10.1175/JCLI-D-23-0649.1 Southern Ocean Asymmetry Wind stress Paci fi c decadal oscillation Atmosphere - ocean interaction Interdecadal variability Meteorology & Atmospheric Sciences ANTARCTIC CIRCUMPOLAR CURRENT SEA-ICE HEAT UPTAKE CLIMATE TEMPERATURE CIRCULATION PENINSULA TRENDS DRIVEN TRANSPORT 期刊论文 2024 ftchinacasciocas https://doi.org/10.1175/JCLI-D-23-0649.1 2024-08-29T23:34:26Z 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. Report Antarc* Antarctic Sea ice Southern Ocean Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Journal of Climate 37 11 3117 3132 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Southern Ocean Asymmetry Wind stress Paci fi c decadal oscillation Atmosphere - ocean interaction Interdecadal variability Meteorology & Atmospheric Sciences ANTARCTIC CIRCUMPOLAR CURRENT SEA-ICE HEAT UPTAKE CLIMATE TEMPERATURE CIRCULATION PENINSULA TRENDS DRIVEN TRANSPORT |
spellingShingle |
Southern Ocean Asymmetry Wind stress Paci fi c decadal oscillation Atmosphere - ocean interaction Interdecadal variability Meteorology & Atmospheric Sciences ANTARCTIC CIRCUMPOLAR CURRENT SEA-ICE HEAT UPTAKE CLIMATE TEMPERATURE CIRCULATION PENINSULA TRENDS DRIVEN TRANSPORT Song, Yuanyuan Li, Yuanlong Hu, Aixue Cheng, Lijing Forget, Gael Chen, Xiaodan Duan, Jing Wang, Fan Decadal Thermal Variability of the Upper Southern Ocean: Zonal Asymmetry |
topic_facet |
Southern Ocean Asymmetry Wind stress Paci fi c decadal oscillation Atmosphere - ocean interaction Interdecadal variability Meteorology & Atmospheric Sciences ANTARCTIC CIRCUMPOLAR CURRENT SEA-ICE HEAT UPTAKE CLIMATE TEMPERATURE CIRCULATION PENINSULA TRENDS DRIVEN TRANSPORT |
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. |
format |
Report |
author |
Song, Yuanyuan Li, Yuanlong Hu, Aixue Cheng, Lijing Forget, Gael Chen, Xiaodan Duan, Jing Wang, Fan |
author_facet |
Song, Yuanyuan Li, Yuanlong Hu, Aixue Cheng, Lijing Forget, Gael Chen, Xiaodan Duan, Jing Wang, Fan |
author_sort |
Song, Yuanyuan |
title |
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 |
publisher |
AMER METEOROLOGICAL SOC |
publishDate |
2024 |
url |
http://ir.qdio.ac.cn/handle/337002/185869 https://doi.org/10.1175/JCLI-D-23-0649.1 |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
JOURNAL OF CLIMATE http://ir.qdio.ac.cn/handle/337002/185869 doi:10.1175/JCLI-D-23-0649.1 |
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_ |
1810290345658810368 |