气候变化领域集成服务门户(CCPortal): Recent summer Arctic atmospheric circulation anomalies in a historical perspective

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DOI	10.5194/tc-9-53-2015
	Recent summer Arctic atmospheric circulation anomalies in a historical perspective
	Belleflamme A.; Fettweis X.; Erpicum M.
发表日期	2015
ISSN	19940416
卷号	9 期号:1
英文摘要	A significant increase in the summertime occurrence of a high pressure area over the Beaufort Sea, the Canadian Arctic Archipelago, and Greenland has been observed since the beginning of the 2000s, and particularly between 2007 and 2012. These circulation anomalies are likely partly responsible for the enhanced Greenland ice sheet melt as well as the Arctic sea ice loss observed since 2007. Therefore, it is interesting to analyse whether similar conditions might have happened since the late 19th century over the Arctic region. We have used an atmospheric circulation type classification based on daily mean sea level pressure and 500 hPa geopotential height data from five reanalysis data sets (ERA-Interim, ERA-40, NCEP/NCAR, ERA-20C, and 20CRv2) to put the recent circulation anomalies in perspective with the atmospheric circulation variability since 1871. We found that circulation conditions similar to 2007-2012 have occurred in the past, despite a higher uncertainty of the reconstructed circulation before 1940. For example, only ERA-20C shows circulation anomalies that could explain the 1920-1930 summertime Greenland warming, in contrast to 20CRv2. While the recent anomalies exceed by a factor of 2 the interannual variability of the atmospheric circulation of the Arctic region, their origin (natural variability or global warming) remains debatable. © 2015 Author(s).
学科领域	annual variation; atmospheric circulation; circulation modeling; cryosphere; geopotential; historical perspective; ice sheet; sea ice; summer; Arctic; Arctic Ocean; Beaufort Sea; Canada; Canadian Arctic; Greenland
语种	英语
scopus关键词	annual variation; atmospheric circulation; circulation modeling; cryosphere; geopotential; historical perspective; ice sheet; sea ice; summer; Arctic; Arctic Ocean; Beaufort Sea; Canada; Canadian Arctic; Greenland
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119971
作者单位	Laboratory of Climatology, Department of Geography, University of Liège, Alleé du 6 Août 2, Liège, 4000, Belgium
推荐引用方式 GB/T 7714	Belleflamme A.,Fettweis X.,Erpicum M.. Recent summer Arctic atmospheric circulation anomalies in a historical perspective[J],2015,9(1).
APA	Belleflamme A.,Fettweis X.,&Erpicum M..(2015).Recent summer Arctic atmospheric circulation anomalies in a historical perspective.Cryosphere,9(1).
MLA	Belleflamme A.,et al."Recent summer Arctic atmospheric circulation anomalies in a historical perspective".Cryosphere 9.1(2015).