DOI: 10.1175/JCLI-D-15-0004.1
Scopus记录号: 2-s2.0-84945931681
论文题名: Comparing sudden stratospheric warming definitions in reanalysis data
作者: Palmeiro F.M. ; Barriopedro D. ; García-Herrera R. ; Calvo N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 17 起始页码: 6823
结束页码: 6840
语种: 英语
Scopus关键词: Climatology
; Upper atmosphere
; Climate prediction
; Climate variability
; Extreme events
; Stratosphere-troposphere coupling
; Stratospheric circulations
; Troposphere
; atmospheric circulation
; climate prediction
; climate variation
; climatology
; extreme event
; Northern Hemisphere
; polar vortex
; stratosphere-troposphere interaction
英文摘要: Sudden stratospheric warmings (SSWs) are characterized by a pronounced increase of the stratospheric polar temperature during the winter season. Different definitions have been used in the literature to diagnose the occurrence of SSWs, yielding discrepancies in the detected events. The aim of this paper is to compare the SSW climatologies obtained by different methods using reanalysis data. The occurrences of Northern Hemisphere SSWs during the extended-winter season and the 1958-2014 period have been identified for a suite of eight representative definitions and three different reanalyses. Overall, and despite the differences in the number and exact dates of occurrence of SSWs, the main climatological signatures of SSWs are not sensitive to the considered reanalysis. The mean frequency of SSWs is 6.7 events decade-1, but it ranges from 4 to 10 events, depending on the method. The seasonal cycle of events is statistically indistinguishable across definitions, with a common peak in January. However, the multidecadal variability is method dependent, with only two definitions displaying minimum frequencies in the 1990s. An analysis of the mean signatures of SSWs in the stratosphere revealed negligible differences among methods compared to the large case-to-case variability within a given definition. The stronger and more coherent tropospheric signals before and after SSWs are associated with major events, which are detected by most methods. The tropospheric signals of minor SSWs are less robust, representing the largest source of discrepancy across definitions. Therefore, to obtain robust results, future studies on stratosphere-troposphere coupling should aim to minimize the detection of minor warmings. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50591
Appears in Collections: 气候变化事实与影响
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作者单位: Departamento de Fisica de la Tierra II, Universidad Complutense de Madrid, Madrid, Spain; Departamento de Fisica de la Tierra II, Instituto de Geociencias, Centro Mixto del Consejo Superior de Investigaciones Cientificas, Universidad Complutense de Madrid, Madrid, Spain
Recommended Citation:
Palmeiro F.M.,Barriopedro D.,García-Herrera R.,et al. Comparing sudden stratospheric warming definitions in reanalysis data[J]. Journal of Climate,2015-01-01,28(17)