globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-16-0261.1
Scopus记录号: 2-s2.0-85017958669
论文题名:
Increased quasi stationarity and persistence of winter ural blocking and Eurasian extreme cold events in response to arctic warming. Part I: Insights from observational analyses
作者: Yao Y.; Luo D.; Dai A.; Simmonds I.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期:10
起始页码: 3549
结束页码: 3568
语种: 英语
Scopus关键词: Infrared radiation ; Sea ice ; Background conditions ; Blocking ; Climate variability ; Extreme events ; Meridional temperature gradient ; Observational analysis ; Quasi-stationarity ; Surface heat fluxes ; Heat flux
英文摘要: Part I of this study examines the relationship among winter cold anomalies over Eurasia, Ural blocking (UB), and the background conditions associated with Arctic warming over the Barents and Kara Seas (BKS) using reanalysis data. It is found that the intensity, persistence, and occurrence region of UB-related Eurasian cold anomalies depend strongly on the strength and vertical shear (VS) of the mean westerly wind (MWW) over mid-high-latitude Eurasia related to BKS warming. Observational analysis reveals that during 1951-2015 UB days are 64% (54%) more frequent during weak MWW (VS) winters, with 26.9 (28.4) days per winter, than during strong MWW (VS) winters. During weak MWW or VS winters, as frequently observed during 2000-15, persistent and large UB-related warming is seen over the BKS together with large and widespread midlatitude Eurasian cold anomalies resulting from increased quasi stationarity and persistence of the UB. By contrast, when the MWW or VS is strong as frequently observed during 1979-99, the cold anomaly is less intense and persistent and confined to a narrow region of Europe because of a rapid westward movement of the strong UB. For this case, the BKS warming is relatively weak and less persistent. The midlatitude cold anomalies are maintained primarily by reduced downward infrared radiation (IR), while the surface heat fluxes, IR, and advection all contribute to the BKS warming. Thus, the large BKS warming since 2000 weakens the meridional temperature gradient, MWW, and VS, which increases quasi stationarity and persistence of the UB (rather than its amplitude) and then leads to more widespread Eurasian cold events and further enhances the BKS warming. © 2017 American Meteorological Society.
资助项目: NSF, National Science Foundation ; NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49681
Appears in Collections:气候变化事实与影响

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作者单位: Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States; National Center for Atmospheric Research, Boulder, CO, United States; School of Earth Sciences, University of Melbourne, Parkville, VIC, Australia

Recommended Citation:
Yao Y.,Luo D.,Dai A.,et al. Increased quasi stationarity and persistence of winter ural blocking and Eurasian extreme cold events in response to arctic warming. Part I: Insights from observational analyses[J]. Journal of Climate,2017-01-01,30(10)
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