气候变化领域集成服务门户(CCPortal): West Antarctic ice loss influenced by internal climate variability and anthropogenic forcing

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DOI	10.1038/s41561-019-0420-9
	West Antarctic ice loss influenced by internal climate variability and anthropogenic forcing
	Holland P.R.; Bracegirdle T.J.; Dutrieux P.; Jenkins A.; Steig E.J.
发表日期	2019
ISSN	17520894
卷号	12 期号:9
英文摘要	Recent ice loss from the West Antarctic Ice Sheet has been caused by ocean melting of ice shelves in the Amundsen Sea. Eastward wind anomalies at the shelf break enhance the import of warm Circumpolar Deep Water onto the Amundsen Sea continental shelf, which creates transient melting anomalies with an approximately decadal period. No anthropogenic influence on this process has been established. Here, we combine observations and climate model simulations to suggest that increased greenhouse gas forcing caused shelf-break winds to transition from mean easterlies in the 1920s to the near-zero mean zonal winds of the present day. Strong internal climate variability, primarily linked to the tropical Pacific, is superimposed on this forced trend. We infer that the Amundsen Sea experienced decadal ocean variability throughout the twentieth century, with warm anomalies gradually becoming more prevalent, offering a credible explanation for the ongoing ice loss. Existing climate model projections show that strong future greenhouse gas forcing creates persistent mean westerly shelf-break winds by 2100, suggesting a further enhancement of warm ocean anomalies. These wind changes are weaker under a scenario in which greenhouse gas concentrations are stabilized. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	anthropogenic effect; climate modeling; climate variation; continental shelf; greenhouse gas; ice shelf; shelf break; Amundsen Sea; Antarctic Ice Sheet; Antarctica; Pacific Ocean; Pacific Ocean (Tropical); Southern Ocean; West Antarctic Ice Sheet; West Antarctica
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124611
作者单位	British Antarctic Survey, Cambridge, United Kingdom; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Holland P.R.,Bracegirdle T.J.,Dutrieux P.,et al. West Antarctic ice loss influenced by internal climate variability and anthropogenic forcing[J],2019,12(9).
APA	Holland P.R.,Bracegirdle T.J.,Dutrieux P.,Jenkins A.,&Steig E.J..(2019).West Antarctic ice loss influenced by internal climate variability and anthropogenic forcing.Nature Geoscience,12(9).
MLA	Holland P.R.,et al."West Antarctic ice loss influenced by internal climate variability and anthropogenic forcing".Nature Geoscience 12.9(2019).