DOI: 10.1002/jgrd.50123
论文题名: A climatology of elevated stratopause events in the whole atmosphere community climate model
作者: Chandran A. ; Collins R.L. ; Garcia R.R. ; Marsh D.R. ; Harvey V.L. ; Yue J. ; De La Torre L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 3 起始页码: 1234
结束页码: 1246
语种: 英语
英文关键词: elevated stratopause
; gravity waves
; planetary waves
; polar vortex
; SSW
; WACCM
Scopus关键词: Climate models
; Climatology
; Gravity waves
; NASA
; Vortex flow
; elevated stratopause
; Planetary Waves
; Polar vortex
; SSW
; WACCM
; Upper atmosphere
; climate modeling
; climatology
; heat flux
; jet
; latitude
; Northern Hemisphere
; simulation
; stratosphere
; vorticity
; wave force
; zonal wind
英文摘要: Elevated stratopause (ES) events occurring during Northern Hemisphere winter are identified in four climate simulations of the period 1953-2005 made with the Whole Atmosphere Community Climate Model (WACCM). We find 68 ES events in 212 winters. These events are found in winters when the middle atmosphere is disturbed and there are zonal wind reversals in the stratosphere at high latitudes. These disturbances can be associated with both major and minor stratospheric sudden warming events (SSWs). The ES events occur under conditions where the stratospheric jet, the gravity wave forcing, and the residual circulation remain reversed longer than in those winters where an SSW occurs without an ES. We compare ES events with the type of SSW (vortex splitting and vortex displacement) and find that 68% of ES events form after vortex splitting events. We also present a climatology of ES events based on NASA's Modern-Era Retrospective Analysis for Research and Applications reanalysis data from 1979 to 2012 and compare it to the model results. WACCM composites of major SSW and ES also show enhanced Eliassen-Palm flux divergences in the upper mesosphere after the stratospheric warming, immediately before the formation of an ES. However, the formation of an ES in WACCM is due primarily to adiabatic heating from gravity wave-driven downwelling, which follows the reestablishment of the eastward jet in the upper stratosphere. We find nine winters where an ES forms in the absence of any significant planetary wave activity in the upper mesosphere and illustrate one such event. KeypointsIn WACCM simulations, ∼ 3 Elevated stratopause events occur per decade68% of Elevated Stratopause events form after vortex splitting eventsElevated stratopause events conform after both major and minor warmings ©2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS 0940124
; ARC 0632387
; ARC 1107498
; NNX10AQ54G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63950
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Atmospheric Sciences, University of Alaska Fairbanks, Fairbanks, AK, United States; Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, United States; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States; High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States; EPhysLab, Facultad de Ciencias, Universidade de Vigo, Ourense, Spain
Recommended Citation:
Chandran A.,Collins R.L.,Garcia R.R.,et al. A climatology of elevated stratopause events in the whole atmosphere community climate model[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(3)