期刊
ADVANCES IN ATMOSPHERIC SCIENCES
卷 39, 期 10, 页码 1591-1597出版社
SCIENCE PRESS
DOI: 10.1007/s00376-022-2087-1
关键词
Antarctic; record low; sea ice budget; atmospheric circulation
资金
- National Natural Science Foundation of China [41941009, 41922044, 42006191]
- Guangdong Basic and Applied Basic Research Foundation [2020B1515020025]
- Fundamental Research Funds for the Central Universities [19lgzd07]
- Norges Forskningsrad [328886]
The seasonal minimum Antarctic sea ice extent in 2022 reached a record low since 1978. Thermodynamic processes played a dominant role in sea ice loss during summer, while both dynamic and thermodynamic processes contributed to negative sea ice anomalies in spring.
Seasonal minimum Antarctic sea ice extent (SIE) in 2022 hit a new record low since recordkeeping began in 1978 of 1.9 million km(2) on 25 February, 0.17 million km(2) lower than the previous record low set in 2017. Significant negative anomalies in the Bellingshausen/Amundsen Seas, the Weddell Sea, and the western Indian Ocean sector led to the new record minimum. The sea ice budget analysis presented here shows that thermodynamic processes dominate sea ice loss in summer through enhanced poleward heat transport and albedo-temperature feedback. In spring, both dynamic and thermodynamic processes contribute to negative sea ice anomalies. Specifically, dynamic ice loss dominates in the Amundsen Sea as evidenced by sea ice thickness (SIT) change, while positive surface heat fluxes contribute most to sea ice melt in the Weddell Sea.
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