DOI: 10.1002/2015JD024401
论文题名: On the composite response of the MLT to major sudden stratospheric warming events with elevated stratopause
作者: Limpasuvan V. ; Orsolini Y.J. ; Chandran A. ; Garcia R.R. ; Smith A.K.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 9 起始页码: 4518
结束页码: 4537
语种: 英语
英文关键词: gravity waves
; major sudden stratospheric warming
; middle atmosphere dynamics
; migrating semidiurnal tides
; planetary waves
; stratosphere and mesosphere coupling
Scopus关键词: atmospheric circulation
; atmospheric forcing
; cooling
; coupling
; dissipation
; downwelling
; gravity wave
; mesosphere
; planetary wave
; semidiurnal tide
; stratosphere
; thermosphere
; warming
英文摘要: Based on a climate-chemistry model (constrained by reanalyses below ∼50 km), the zonal-mean composite response of the mesosphere and lower thermosphere (MLT) to major sudden stratospheric warming events with elevated stratopauses demonstrates the role of planetary waves (PWs) in driving the mean circulation in the presence of gravity waves (GWs), helping the polar vortex recover and communicating the sudden stratospheric warming (SSW) impact across the equator. With the SSW onset, strong westward PW drag appears above 80 km primarily from the dissipation of wave number 1 perturbations with westward period of 5-12 days, generated from below by the unstable westward polar stratospheric jet that develops as a result of the SSW. The filtering effect of this jet also allows eastward propagating GWs to saturate in the winter MLT, providing eastward drag that promotes winter polar mesospheric cooling. The dominant PW forcing translates to a net westward drag above the eastward mesospheric jet, which initiates downwelling over the winter pole. As the eastward polar stratospheric jet returns, this westward PW drag persists above 80 km and acts synergistically with the return of westward GW drag to drive a stronger polar downwelling that warms the pole adiabatically and helps reform the stratopause at an elevated altitude. With the polar wind reversal during the SSW onset, the westward drag by the quasi-stationary PW in the winter stratosphere drives an anomalous equatorial upwelling and cooling that enhance tropical stratospheric ozone. Along with equatorial wind anomalies, this ozone enhancement subsequently amplifies the migrating semidiurnal tide amplitude in the winter midlatitudes. © 2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62864
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: School of Coastal and Marine Systems Science, Coastal Carolina University, Conway, SC, United States; Norwegian Institute for Air Research (NILU), Kjeller, Norway; Birkeland Centre for Space Science, University of Bergen, Bergen, Norway; Laboratory for Atmospheric and Space Physics, Boulder, CO, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Limpasuvan V.,Orsolini Y.J.,Chandran A.,et al. On the composite response of the MLT to major sudden stratospheric warming events with elevated stratopause[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(9)