DOI: 10.1175/JCLI-D-17-0695.1
Scopus记录号: 2-s2.0-85049752616
论文题名: Preconditioning of Arctic stratospheric polar vortex shift events
作者: Huang J. ; Tian W. ; Gray L.J. ; Zhang J. ; Li Y. ; Luo J. ; Tian H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 14 起始页码: 5417
结束页码: 5436
语种: 英语
英文关键词: Atmosphere
; Blocking
; Stratosphere
; Stratosphere-troposphere coupling
Scopus关键词: Earth atmosphere
; Heat flux
; Troposphere
; Upper atmosphere
; Blocking
; Composite analysis
; Lower stratosphere
; Spatial patterns
; Stratosphere-troposphere coupling
; Stratospheric polar vortex
; Surface cooling
; Vortex position
; Vortex flow
; atmospheric blocking
; cooling
; planetary wave
; polar vortex
; regional climate
; stratosphere-troposphere interaction
; Arctic
; Atlantic Ocean
; Bering Strait
; Eurasia
; Europe
; North America
英文摘要: This study examines the preconditioning of events in which the Arctic stratospheric polar vortex shifts toward Eurasia (EUR events), North America (NA events), and the Atlantic (ATL events) using composite analysis. An increase in blocking days over northern Europe and a decrease in blocking days over the Bering Strait favor the movement of the vortex toward Eurasia, while the opposite changes in blocking days over those regions favor the movement of the vortex toward North America. An increase in blocking days over the eastern North Atlantic and a decrease in blocking days over the Bering Strait are conducive to movement of the stratospheric polar vortex toward the Atlantic. These anomalous precursor blocking patterns are interpreted in terms of the anomalous zonal wave-1 or wave-2 planetary wave fluxes into the stratosphere that are known to influence the vortex position and strength. In addition, the polar vortex shift events are further classified into events with small and large polar vortex deformation, since the two types of events are likely to have a different impact at the surface. A significant difference in the zonal wave-2 heat flux into the lower stratosphere exists prior to the two types of events and this is linked to anomalous blocking patterns. This study further defines three types of tropospheric blocking events in which the spatial patterns of blocking frequency anomalies are similar to the blocking patterns prior to EUR, NA, and ATL events, respectively, and our reanalysis reveals that the polar vortex is indeed more likely to shift toward Eurasia, North America, and the Atlantic in the presence of the above three defined tropospheric blocking events. These shifts of the polar vortex toward Eurasia, North America, and the Atlantic lead to statistically significant negative height anomalies near the tropopause and corresponding surface cooling anomalies over these three regions. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111461
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; National Centre for Atmospheric Science, Physics Department, University of Oxford, Oxford, United Kingdom
Recommended Citation:
Huang J.,Tian W.,Gray L.J.,et al. Preconditioning of Arctic stratospheric polar vortex shift events[J]. Journal of Climate,2018-01-01,31(14)