DOI: 10.1175/JCLI-D-16-0400.1
Scopus记录号: 2-s2.0-85015879840
论文题名: Downward wave reflection as a mechanism for the stratosphere-troposphere response to the 11-Yr solar cycle
作者: Lu H. ; Scaife A.A. ; Marshall G.J. ; Turner J. ; Gray L.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 7 起始页码: 2395
结束页码: 2414
语种: 英语
Scopus关键词: Atmospheric pressure
; Fighter aircraft
; Hydraulic structures
; Mechanical waves
; Radiation effects
; Solar energy
; Troposphere
; Upper atmosphere
; Waveguides
; Atmospheric circulation
; North Atlantic oscillations
; Rossby wave
; Solar cycle
; Stratospheric circulations
; Wavebreaking
; Shear flow
; atmospheric circulation
; North Atlantic Oscillation
; planetary wave
; Rossby wave
; solar cycle
; stratosphere-troposphere interaction
; wave breaking
; wave reflection
英文摘要: The effects of solar activity on the stratospheric waveguides and downward reflection of planetary waves during NH early to midwinter are examined. Under high solar (HS) conditions, enhanced westerly winds in the subtropical upper stratosphere and the associated changes in the zonal wind curvature led to an altered waveguide geometry across the winter period in the upper stratosphere. In particular, the condition for barotropic instability was more frequently met at 1 hPa near the polar-night jet centered at about 55°N. In early winter, the corresponding change in wave forcing was characterized by a vertical dipole pattern of the Eliassen-Palm (E-P) flux divergent anomalies in the high-latitude upper stratosphere accompanied by poleward E-P flux anomalies. These wave forcing anomalies corresponded with negative vertical shear of zonal mean winds and the formation of a vertical reflecting surface. Enhanced downward E-P flux anomalies appeared below the negative shear zone; they coincided with more frequent occurrence of negative daily heat fluxes and were associated with eastward acceleration and downward group velocity. These downward-reflected wave anomalies had a detectable effect on the vertical structure of planetary waves during November-January. The associated changes in tropospheric geopotential height contributed to a more positive phase of the North Atlantic Oscillation in January and February. These results suggest that downward reflection may act as a "top down" pathway by which the effects of solar ultraviolet (UV) radiation in the upper stratosphere can be transmitted to the troposphere. © 2017 American Meteorological Society.
资助项目: NERC, Natural Environment Research Council
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49748
Appears in Collections: 气候变化事实与影响
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作者单位: British Antarctic Survey, High Cross, Cambridge, United Kingdom; Met Office Hadley Centre, Exeter, United Kingdom; NCAS-Climate, Department of Atmospheric Physics, Clarendon Laboratory, Oxford University, Oxford, United Kingdom
Recommended Citation:
Lu H.,Scaife A.A.,Marshall G.J.,et al. Downward wave reflection as a mechanism for the stratosphere-troposphere response to the 11-Yr solar cycle[J]. Journal of Climate,2017-01-01,30(7)