DOI: 10.1002/2015GL066754
论文题名: Do split and displacement sudden stratospheric warmings have different annular mode signatures?
作者: Maycock A.C. ; Hitchcock P.
刊名: Geophysical Research Letters
ISSN: 0094-8319
EISSN: 1944-8050
出版年: 2015
卷: 42, 期: 24 起始页码: 10943
结束页码: 10951
语种: 英语
英文关键词: annular modes
; climate variability
; stratosphere-troposphere coupling
; stratospheric sudden warmings
Scopus关键词: Climate change
; Troposphere
; Uncertainty analysis
; Annular modes
; Classification methodologies
; Climate variability
; Northern annular mode
; Stratosphere-troposphere coupling
; Stratospheric sudden warmings
; Stratospheric warmings
; Stratospheric winds
; Upper atmosphere
; algorithm
; atmospheric circulation
; climate modeling
; climate variation
; correlation
; displacement
; extratropical environment
; forecasting method
; polar vortex
; prediction
; stratosphere-troposphere interaction
; warming
; wind field
英文摘要: Sudden stratospheric warmings (SSWs) contribute to intraseasonal tropospheric forecasting skill due to their surface impacts. Recent studies suggest these impacts depend upon whether the polar vortex splits or is displaced during the SSW. We analyze the annular mode signatures of SSWs in a 1000 year IPSL-CM5A-LR simulation. Although small differences in the mean surface Northern Annular Mode (NAM) index following splits and displacements are found, the sign is not consistent for two independent SSW algorithms, and over 50 events are required to distinguish the responses. We use the wintertime correlation between extratropical lower stratospheric wind anomalies and the surface NAM index as a metric for two-way stratosphere-troposphere coupling and find that the differences between splits and displacements, and between classification methodologies, can be simply understood in terms of their mean stratospheric wind anomalies. Predictability studies should therefore focus on understanding the factors that determine the persistence of these anomalies following SSWs. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955177892&doi=10.1002%2f2015GL066754&partnerID=40&md5=31b623081cad0f8c9c7630ff34039caa
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7935
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Centre for Atmospheric Science, University of Cambridge, Cambridge, United Kingdom
Recommended Citation:
Maycock A.C.,Hitchcock P.. Do split and displacement sudden stratospheric warmings have different annular mode signatures?[J]. Geophysical Research Letters,2015-01-01,42(24).