Evolution of Antarctic Sea Ice Ahead of the Record Low Annual Maximum Extent in September 2023

被引：7
|
作者：
Jena, Babula [1 ]
Kshitija, S. [1 ]
Bajish, C. C. [2 ]
Turner, John [3 ]
Holmes, Caroline [3 ]
Wilkinson, Jeremy [3 ]
Mohan, Rahul [1 ]
Thamban, M. [1 ]
机构：
[1] Minist Earth Sci, Natl Ctr Polar & Ocean Res, Vasco Da Gama, India
[2] Inst Climate Change Studies, Kottayam, India
[3] NERC, British Antarctic Survey, Cambridge, England
来源：
GEOPHYSICAL RESEARCH LETTERS | 2024年 / 51卷 / 07期
基金：
美国国家航空航天局; 英国自然环境研究理事会;
关键词：
record low sea ice 2023; polar cyclones; Amundsen Sea low; Southern Ocean warming; atmospheric warming; ice-edge shift; OCEAN; VARIABILITY; TRENDS;
D O I：
10.1029/2023GL107561
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The 2023 Antarctic sea ice extent (SIE) maximum on 7 September was the lowest annual maximum in the satellite era (16.98 x 10(6) km(2)), with the largest contributions to the anomaly coming from the Ross (37.7%, -0.57 x 10(6) km(2)) and Weddell (32.9%, -0.49 x 10(6) km(2)) Seas. The SIE was low due to anomalously warm (>0.3 degrees C) upper-ocean temperatures combined with anomalously strong northerly winds impeding the ice advance during the fall and winter. Northerly winds of >12 ms(-1) in the Weddell Sea occurred because of negative pressure anomalies over the Antarctic Peninsula, while those in the Ross Sea were associated with extreme blocking episodes off the Ross Ice Shelf. The Ross Sea experienced an unprecedented SIE decrease of -1.08 x 10(3) km(2) d(-1) from 1 June till the annual maximum. The passage of quasi-stationary and explosive polar cyclones contributed to periods of southward ice-edge shift in both sectors.
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页数：10
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