气候变化领域集成服务门户(CCPortal): Tracking the Stratosphere-to-Surface Impact of Sudden Stratospheric Warmings

CCPortal

DOI	10.1029/2020JD033881
	Tracking the Stratosphere-to-Surface Impact of Sudden Stratospheric Warmings
	Hall R.J.; Mitchell D.M.; Seviour W.J.M.; Wright C.J.
发表日期	2021
ISSN	2169897X
卷号	126 期号:3
英文摘要	Sudden stratospheric warming (SSW) events are extreme atmospheric regimes which can have a signature in surface weather up to 40 days after event onset in the stratosphere. SSWs can be classified as either vortex splitting or vortex displacement events, with the nature and timing of the surface impact potentially being different between the two. In this study, using ERA40/Interim reanalysis data, we develop a simple empirical downward tracking algorithm which for the first time allows us to estimate the time of surface impact for individual SSW events. We show that the surface impact following splitting events is, on average, about 1 week earlier than following displacement events, albeit with considerable variability. By compositing tropospheric responses around the identified date of surface impact, rather than around the central stratospheric onset date as common in previous studies, we can better constrain the surface signal of SSWs. We find that while the difference in North Atlantic Oscillation anomalies between split and displacement vortices is small, surface temperature anomalies over northwest Europe and northern Eurasia are significantly colder for splitting events, particularly over the UK just prior to the surface impact date. Displacement events on average are wetter over Northwest Europe around the time of surface impact, consistent with the jet stream being displaced further south in response to split events. Our downtracking algorithm can be used with any reanalyzes and gridded model data, and therefore will be a valuable tool for use with the latest climate models. © 2020 The Authors.
英文关键词	North Atlantic Oscillation; stratosphere-troposphere coupling; stratospheric sudden warming; surface impacts
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185506
作者单位	School of Geographical Sciences, Cabot Institute for the Environment, University of Bristol, Bristol, United Kingdom; Global Systems Institute and Department of Mathematics, University of Exeter, Exeter, United Kingdom; Centre for Space, Atmospheric and Oceanic Science, University of Bath, Bath, United Kingdom
推荐引用方式 GB/T 7714	Hall R.J.,Mitchell D.M.,Seviour W.J.M.,et al. Tracking the Stratosphere-to-Surface Impact of Sudden Stratospheric Warmings[J],2021,126(3).
APA	Hall R.J.,Mitchell D.M.,Seviour W.J.M.,&Wright C.J..(2021).Tracking the Stratosphere-to-Surface Impact of Sudden Stratospheric Warmings.Journal of Geophysical Research: Atmospheres,126(3).
MLA	Hall R.J.,et al."Tracking the Stratosphere-to-Surface Impact of Sudden Stratospheric Warmings".Journal of Geophysical Research: Atmospheres 126.3(2021).