气候变化领域集成服务门户(CCPortal): Midlatitude winter extreme temperature events and connections with anomalies in the arctic and tropics

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DOI	10.1175/JCLI-D-20-0371.1
	Midlatitude winter extreme temperature events and connections with anomalies in the arctic and tropics
	Rudeva I.; Simmonds I.
发表日期	2021
ISSN	08948755
起始页码	3733
结束页码	3749
卷号	34 期号:10
英文摘要	For the last few decades the Northern Hemisphere midlatitudes have seen an increasing number of temperature extreme events. It has been suggested that some of these extremes are related to planetary wave activity. In this study we identify wave propagation regions at 300 hPa using the ERA-Interim dataset from 1980 to 2017 and link them to temperature extremes in densely populated regions of the Northern Hemisphere. Most studies have used background flow fields at monthly or seasonal scale to investigate wave propagation. For a phenomenon that is influenced by threshold incidents and nonlinear processes, this can distort the net Rossby wave signal. A novel aspect of our investigation lies in the use of daily data to study wave propagation allowing it to be diagnosed for limited but important periods across a wider range of latitudes, including the polar region. We show that winter temperature extremes in the midlatitudes can be associated with circulation anomalies in both the Arctic and the tropics, while the relative importance of these areas differs according to the specific midlatitude region. In particular, wave trains connecting the tropical Pacific and Atlantic may be associated with temperature anomalies in North America and Siberia. Arctic seas are markedly important for Eurasian regions. Analysis of synoptic temperature extremes suggests that preexisting local temperature anomalies play a key role in the development of those extremes, as well as amplification of large-scale wave trains. We also demonstrate that warm Arctic regions can create cold outbreaks in both Siberia and North America. Ó 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Arctic; Extreme events; North Atlantic Oscillation; Pacific-North American pattern/oscillation; Rossby waves; Sea ice; Stationary waves; Teleconnections
语种	英语
scopus关键词	Mechanical waves; Wave propagation; American meteorological societies; Circulation anomalies; Copyright informations; Densely populated regions; Extreme temperature events; Northern Hemispheres; Planetary wave activity; Temperature extremes; Tropics
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/178582
作者单位	Australian Bureau of Meteorology, Melbourne, VIC, Australia; School of Earth Sciences, University of Melbourne, Melbourne, VIC, Australia
推荐引用方式 GB/T 7714	Rudeva I.,Simmonds I.. Midlatitude winter extreme temperature events and connections with anomalies in the arctic and tropics[J],2021,34(10).
APA	Rudeva I.,&Simmonds I..(2021).Midlatitude winter extreme temperature events and connections with anomalies in the arctic and tropics.Journal of Climate,34(10).
MLA	Rudeva I.,et al."Midlatitude winter extreme temperature events and connections with anomalies in the arctic and tropics".Journal of Climate 34.10(2021).