气候变化领域集成服务门户(CCPortal): Summer heat extremes in northern continents linked to developing ENSO events

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DOI	10.1088/1748-9326/ab7d07
	Summer heat extremes in northern continents linked to developing ENSO events
	Luo M.; Lau N.-C.
发表日期	2020
ISSN	17489318
卷号	15 期号:7
英文摘要	Understanding the variations of extreme weather/climate events is important to improve the seasonal forecast skill of such harmful events. Previous studies have linked boreal summer hot extremes to decaying El Nĩo-Southern Oscillation (ENSO) events at the interannual scale, but how these hot extreme episodes respond to developing ENSO events remains unclear. Using observational analyses, we demonstrate strong linkages between developing ENSO and extreme heat events in northern continents. In particular, heat extremes in North America, Eastern Europe-Central Asia and Northeast Asia tend to be more frequent during La Nĩa developing summers and less frequent during El Nĩo developing phases. Associated atmospheric changes reveal that developing ENSO events feature a circumglobal teleconnection (CGT) pattern over the mid-latitudes. In the La Nĩa developing summer, this CGT pattern exhibits enhanced geopotential height and anomalous anticyclones over North Pacific, North America, Eastern Europe-Central Asia and Northeastern Asia, and the jet stream generally shifts northward. The atmospheric circulation changes lead to more persistent weather conditions that favor extreme heat events in mid-latitudes. Conversely, opposite changes associated with developing El Nĩo can inhibit heat extremes in the above locations. The responses of heat extremes to different types (i.e., conventional Eastern Pacific and Modoki Central Pacific) and durations (1 and 2 year) of ENSO events are also discussed. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	circumglobal teleconnection; El Niño-Southern Oscillation; interannual variability; jet stream; summer heat extremes
语种	英语
scopus关键词	Atmospheric pressure; Atmospheric changes; Atmospheric circulation changes; Circumglobal teleconnection patterns; Eastern pacific; Geo-potential heights; Observational analysis; Seasonal forecasts; Southern oscillation; Climatology; air-sea interaction; climate change; El Nino-Southern Oscillation; heating; summer
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153978
作者单位	School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, 510275, China; Institute of Environment, Energy and Sustainability, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, Hong Kong; Department of Geography and Resource Management, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Luo M.,Lau N.-C.. Summer heat extremes in northern continents linked to developing ENSO events[J],2020,15(7).
APA	Luo M.,&Lau N.-C..(2020).Summer heat extremes in northern continents linked to developing ENSO events.Environmental Research Letters,15(7).
MLA	Luo M.,et al."Summer heat extremes in northern continents linked to developing ENSO events".Environmental Research Letters 15.7(2020).