DOI: 10.1175/JCLI-D-12-00030.1
Scopus记录号: 2-s2.0-84876814268
论文题名: The influence of stratospheric vortex displacements and splits on surface climate
作者: Mitchell D.M. ; Gray L.J. ; Anstey J. ; Baldwin M.P. ; Charlton-Perez A.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 8 起始页码: 2668
结束页码: 2682
语种: 英语
Scopus关键词: Classification technique
; Eastern north america
; Seasonal climate predictability
; Stratosphere-troposphere coupling
; Stratospheric variability
; Stratospheric vortex
; Surface temperatures
; Vortex-splitting events
; Atmospheric temperature
; Upper atmosphere
; Vortex flow
; atmospheric dynamics
; climatology
; cold air
; polar vortex
; sea surface temperature
; seasonal variation
; stratosphere
; stratosphere-troposphere interaction
; temperature anomaly
; vorticity
; Arctic
; North America
英文摘要: Astrong link exists between stratospheric variability and anomalous weather patterns at the earth's surface. Specifically, during extreme variability of the Arctic polar vortex termed a "weak vortex event, "anomalies can descend from the upper stratosphere to the surface on time scales of weeks. Subsequently the outbreak of cold-air events have been noted in high northern latitudes, as well as a quadrupole pattern in surface temperature over the Atlantic and western European sectors, but it is currently not understood why certain events descend to the surface while others do not. This study compares a new classification technique of weak vortex events, based on the distribution of potential vorticity, with that of an existing technique and demonstrates that the subdivision of such events into vortex displacements and vortex splits has important implications for tropospheric weather patterns on weekly to monthly time scales. Using reanalysis data it is found that vortex splitting events are correlated with surface weather and lead to positive temperature anomalies over eastern North America of more than 1.5 K, and negative anomalies over Eurasia of up to 23 K. Associated with this is an increase in high-latitude blocking in both the Atlantic and Pacific sectors and a decrease in European blocking. The corresponding signals are weaker during displacement events, although ultimately they are shown to be related to cold-air outbreaks over North America. Because of the importance of stratosphere-troposphere coupling for seasonal climate predictability, identifying the type of stratospheric variability in order to capture the correct surface response will be necessary. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51889
Appears in Collections: 气候变化事实与影响
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作者单位: National Centre for Atmospheric Science, University of Oxford, Oxford, United Kingdom; Northwest Research Associates, Seattle, Washington, United States; Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Mitchell D.M.,Gray L.J.,Anstey J.,et al. The influence of stratospheric vortex displacements and splits on surface climate[J]. Journal of Climate,2013-01-01,26(8)