Amplified Interannual Variation of the Summer Sea Ice in the Weddell Sea, Antarctic After the Late 1990s

被引：5

作者：

Guo, Yuanyuan ^{[1
,2
]}

Chen, Xiaodan ^{[1
]}

Huang, Sihua ^{[1
]}

Wen, Zhiping ^{[1
,3
,4
]}

机构：

[1] Fudan Univ, Inst Atmospher Sci, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China

[2] Minist Educ LOIA, Key Lab Coupled Ocean Ice Atmosphere Syst & Weathe, Shanghai, Peoples R China

[3] Fudan Univ, Shanghai Key Lab Ocean Land Atmosphere Boundary Dy, Shanghai, Peoples R China

[4] Jiangsu Collaborat Innovat Ctr Climate Change, Nanjing, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 17期

基金：

中国国家自然科学基金;

关键词：

Antarctic sea ice; Southern Annular Mode; thermodynamic process; Weddell Sea; ATMOSPHERIC CIRCULATION; VARIABILITY; CLIMATE; TRENDS; DRIVERS; IMPACTS; EXTENT;

D O I：

10.1029/2023GL104924

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The sea-ice extent (SIE) in the Weddell Sea plays a crucial role in the Antarctic climate system. Many studies have examined its long-term trend, however whether its year-to-year variation has changed remains unclear. We found an amplified year-to-year variance of the Weddell Sea SIE in austral summer since 1998/1999 in observational datasets. Analyses of sea-ice concentration budget and surface fluxes indicate that it is the thermodynamic process that drives the amplification of SIE variations, rather than the sea-ice-drift-related dynamic process. Compared to 1979-1998, the Southern Annular Mode in the preceding spring shows a closer linkage with the Weddell Sea SIE in 1999-2021 through a stronger and more prolonged impact on sea surface temperature, which thermodynamically modulates local sea ice via changing surface heat and radiation fluxes. Our study helps advance the understanding of extreme low Antarctic-SIE records occurring in recent decades and improve future projections of the Antarctic sea-ice variability.

引用

页数：11

共 57 条

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