气候变化领域集成服务门户(CCPortal): Understanding of European cold extremes; sudden stratospheric warming; and Siberian snow accumulation in the winter of 2017/18

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DOI	10.1175/JCLI-D-18-0861.1
	Understanding of European cold extremes; sudden stratospheric warming; and Siberian snow accumulation in the winter of 2017/18
	Zhuozhuo L.Ü.; Fei L.I.; Orsolini Y.J.; Yongqi G.A.O.; Shengping H.E.
发表日期	2020
ISSN	0894-8755
起始页码	527
结束页码	545
卷号	33 期号:2
英文摘要	It is unclear whether the Eurasian snow plays a role in the tropospheric driving of sudden stratospheric warming (SSW). The major SSW event of February 2018 is analyzed using reanalysis datasets. Characterized by predominant planetary waves of zonal wave 2, the SSW developed into a vortex split via wave-mean flow interaction. In the following two weeks, the downward migration of zonal-mean zonal wind anomalies was accompanied by a significant transition to the negative phase of the North Atlantic Oscillation, leading to extensive cold extremes across Europe. Here, we demonstrate that anomalous Siberian snow accumulation could have played an important role in the 2018 SSW occurrence. In the 2017/18 winter, snow depths over Siberia were much higher than normal. A lead-lag correlation analysis shows that the positive fluctuating snow depth anomalies, leading to intensified ''cold domes'' over eastern Siberia (i.e., in a region where the climatological upward planetary waves maximize), precede enhanced wave-2 pulses of meridional heat fluxes (100 hPa) by 7-8 days. The snow-SSW linkage over 2003-19 is further investigated, and some common traits among three split events are found. These include a time lag of about one week between the maximum anomalies of snow depth and wave-2 pulses (100 hPa), high sea level pressure favored by anomalous snowpack, and a ridge anchoring over Siberia as precursor of the splits. The role of tropospheric ridges over Alaska and the Urals in the wave-2 enhancement and the role of Arctic sea ice loss in Siberian snow accumulation are also discussed. © 2019 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric pressure; Sea ice; Sea level; Snow melting systems; Troposphere; Correlation analysis; Eastern Siberia; North Atlantic oscillations; Sea level pressure; Snow accumulation; Sudden stratospheric warming; Wave-mean-flow interaction; Zonal-mean zonal winds; Snow; climate; extreme event; seasonal variation; snow accumulation; sudden stratospheric warming; temperature anomaly; troposphere; zonal wind; Alaska; Siberia; United States; 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/171487
作者单位	Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, China; Geophysical Institute, University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway; Norwegian Institute for Air Research (NILU), Kjeller, Norway; Nansen Environmental and Remote Sensing Center, Bjerknes Centre for Climate Research, Bergen, Norway; Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Zhuozhuo L.Ü.,Fei L.I.,Orsolini Y.J.,et al. Understanding of European cold extremes; sudden stratospheric warming; and Siberian snow accumulation in the winter of 2017/18[J],2020,33(2).
APA	Zhuozhuo L.Ü.,Fei L.I.,Orsolini Y.J.,Yongqi G.A.O.,&Shengping H.E..(2020).Understanding of European cold extremes; sudden stratospheric warming; and Siberian snow accumulation in the winter of 2017/18.Journal of Climate,33(2).
MLA	Zhuozhuo L.Ü.,et al."Understanding of European cold extremes; sudden stratospheric warming; and Siberian snow accumulation in the winter of 2017/18".Journal of Climate 33.2(2020).