How Do Weakening of the Stratospheric Polar Vortex in the Southern Hemisphere Affect Regional Antarctic Sea Ice Extent?

被引：16
作者：
Wang, Shaoyin [1 ,2 ,3 ]
Liu, Jiping [4 ]
Cheng, Xiao [1 ,2 ,3 ]
Kerzenmacher, Tobias [5 ]
Hu, Yongyun [6 ]
Hui, Fengming [1 ,2 ,3 ]
Braesicke, Peter [5 ]
机构：
[1] Sun Yat Sen Univ, Sch Geospatial Engn & Sci, Zhuhai, Peoples R China
[2] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China
[3] Univ Corp Polar Res, Zhuhai, Peoples R China
[4] SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY 12222 USA
[5] Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Karlsruhe, Germany
[6] Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Beijing, Peoples R China
来源：
GEOPHYSICAL RESEARCH LETTERS | 2021年 / 48卷 / 11期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Antarctic sea ice; stratospheric polar vortex; Amundsen Sea Low; stratosphere-troposphere coupling; sudden stratospheric warmings; WEST ANTARCTICA; VARIABILITY; CLIMATE; TROPOSPHERE;
D O I：
10.1029/2021GL092582
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
In the Southern Hemisphere, variability of the stratospheric polar vortex is an important driver of surface climate. In this study, we explore the influence of weakening and strengthening of the polar vortex on regional Antarctic sea ice in observations and model simulations. We propose a two-stage mechanism that translates stratospheric harbingers to sea ice changes: (a) it starts with polar vortex variability that is highly correlated with the Amundsen Sea Low (ASL); through modulation of the ASL and thus surface winds, (b) weak polar vortex leads to statistically significant decrease of sea ice over the Ross Sea and increase of sea ice around the Antarctic Peninsula, and vice versa. The two-stage mechanism can be detected in observations and state-of-the-art model simulations, confirming a robust chain of response. This study underlines the importance of stratosphere-troposphere coupling on the Antarctic sea ice variability and its seasonal predictability.
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页数：10
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