期刊
JOURNAL OF CLIMATE
卷 32, 期 17, 页码 5381-5395出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JCLI-D-18-0635.1
关键词
Atmosphere; Antarctica; Sea ice; Severe storms; Ocean models
资金
- Major State Basic Research Development Program of China [2016YFA0601804]
- Global Change Research Program of China [2015CB953900]
- National Natural Science Foundation of China [41876220]
- Fundamental Research Funds for the Central Universities [2017B04814, 2017B20714]
- NERC [bas0100032] Funding Source: UKRI
Between 2014 and 2016 the annual mean total extent of Antarctic sea ice decreased by a record, unprecedented amount of 1.6 x 10(6) km(2), the largest in a record starting in the late 1970s. The mechanisms behind such a rapid decrease remain unknown. Using the outputs of a high-resolution, global ocean-sea ice model we show that the change was predominantly a result of record atmospheric low pressure systems over sectors of the Southern Ocean in 2016, with the associated winds inducing strong sea ice drift. Regions of large positive and negative sea ice extent anomaly were generated by both thermal and dynamic effects of the wind anomalies. Although the strong wind forcing also generated the warmest ocean surface state from April to December 2016, we show that enhanced northward sea ice drift and hence increased melting at lower latitudes driven by strong winds made the dominant contribution to the large decrease in total Antarctic sea ice extent between 2014 and 2016.
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