DOI: 10.1002/jgrd.50374
论文题名: Solar wind dynamic pressure effect on planetary wave propagation and synoptic-scale Rossby wave breaking
作者: Lu H. ; Franzke C. ; Martius O. ; Jarvis M.J. ; Phillips T.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4476
结束页码: 4493
语种: 英语
英文关键词: atmospheric waves
; downward propagation
; Rossby waves
; solar wind dynamic pressure
; wave-mean flow interaction
Scopus关键词: Oceanography
; Solar radiation
; Wave propagation
; Atmospheric waves
; Baroclinic instability
; Circulation anomalies
; Northern annular mode
; Rossby wave
; Solar wind dynamic pressure
; Statistical evidence
; Wave-mean-flow interaction
; Solar wind
; barotropic instability
; divergence
; irradiance
; planetary wave
; polar region
; polar vortex
; pressure effect
; Rossby wave
; solar wind
; stratosphere
; synoptic meteorology
; wave breaking
; wave propagation
; winter
英文摘要: We provide statistical evidence of the effect of the solar wind dynamic pressure (Psw ) on the northern winter and spring circulations. We find that the vertical structure of the Northern Annular Mode (NAM), the zonal mean circulation, and Eliassen-Palm (EP)-flux anomalies show a dynamically consistent pattern of downward propagation over a period of ~45 days in response to positive Psw anomalies. When the solar irradiance is high, the signature of Psw is marked by a positive NAM anomaly descending from the stratosphere to the surface during winter. When the solar irradiance is low, the Psw signal has the opposite sign, occurs in spring, and is confined to the stratosphere. The negative Psw signal in the NAM under low solar irradiance conditions is primarily governed by enhanced vertical EP-flux divergence and a warmer polar region. The winter Psw signal under high solar irradiance conditions is associated with positive anomalies of the horizontal EP-flux divergence at 55°N-75°N and negative anomalies at 25°N-45°N, which corresponds to the positive NAM anomaly. The EP-flux divergence anomalies occur ~15 days ahead of the mean-flow changes. A significant equatorward shift of synoptic-scale Rossby wave breaking (RWB) near the tropopause is detected during January-March, corresponding to increased anticyclonic RWB and a decrease in cyclonic RWB. We suggest that the barotropic instability associated with asymmetric ozone in the upper stratosphere and the baroclinic instability associated with the polar vortex in the middle and lower stratosphere play a critical role for the winter signal and its downward propagation. Key Points Northern circulation anomalies relate to changes of solar wind dynamic pressureDescending mean flow circulation & EP-flux anomalies are dynamically consistenPositive NAM & equatorward shift of RWB under high solar wind dynamic pressure ©2013. 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/63749
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: British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom; Institute of Geography, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Recommended Citation:
Lu H.,Franzke C.,Martius O.,et al. Solar wind dynamic pressure effect on planetary wave propagation and synoptic-scale Rossby wave breaking[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)