气候变化领域集成服务门户(CCPortal): Two leading modes of wintertime atmospheric circulation drive the recent warm arctic-cold eurasia temperature pattern

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DOI	10.2196/10.1175/JCLI-D-19-0403.1
	Two leading modes of wintertime atmospheric circulation drive the recent warm arctic-cold eurasia temperature pattern
	Ye K.; Messori G.
发表日期	2020
ISSN	0894-8755
起始页码	5565
结束页码	5587
卷号	33 期号:3
英文摘要	The wintertime warm Arctic-cold Eurasia (WACE) temperature trend during 1990-2010 was characterized by accelerating warming in the Arctic region, cooling in Eurasia, and accelerating autumn/winter Arctic sea ice loss.We identify two atmospheric circulation modes over the North Atlantic-northern Eurasian sector that displayed strong upward trends over the same period and can explain a large part of the observed decadal WACE pattern. Both modes bear a close resemblance to well-known teleconnection patterns and are relatively independent from variability in Arctic sea ice cover. The first mode (PC1) captures the recent negative trends in the North Atlantic Oscillation and increased Greenland blocking frequency, while the second mode (PC2) is reminiscent of a Rossby wave train and reflects an increased blocking frequency over the Urals and north Asia. We find that the loss in the Arctic sea ice and the upward trends in PC1 and PC2 together account for most of the decadal Arctic warming trend (.80%). However, the decadal Eurasian cooling trends may be primarily ascribed to the two circulation modes alone: All of the cooling in Siberia is contributed to by PC1 and 65% of the cooling in East Asia by their combination (the contribution by PC2 doubles that by PC1). Enhanced intraseasonal activity of the two circulation modes increases blocking frequencies over Greenland, the Ural region, and north Asia, which drive anomalous moisture/heat flux toward the Arctic and alter the downward longwave radiation. This also weakens warm advection and enhances advection of cold Arctic airmasses towards Eurasia. © 2020 American Meteorological Society.
英文关键词	Advection; Atmospheric pressure; Climatology; Mechanical waves; Sea ice; Atmospheric circulation; Circulation mode; Intraseasonal activity; Long-wave radiation; North Atlantic oscillations; Teleconnection patterns; Temperature patterns; Temperature trends; Cooling; atmospheric circulation; atmospheric convection; North Atlantic Oscillation; Rossby wave; seasonal variation; teleconnection; temperature effect; Eurasia; Urals
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171257
作者单位	Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Department of Meteorology, Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
推荐引用方式 GB/T 7714	Ye K.,Messori G.. Two leading modes of wintertime atmospheric circulation drive the recent warm arctic-cold eurasia temperature pattern[J],2020,33(3).
APA	Ye K.,&Messori G..(2020).Two leading modes of wintertime atmospheric circulation drive the recent warm arctic-cold eurasia temperature pattern.Journal of Climate,33(3).
MLA	Ye K.,et al."Two leading modes of wintertime atmospheric circulation drive the recent warm arctic-cold eurasia temperature pattern".Journal of Climate 33.3(2020).