DOI: 10.1002/2017JD027968
Scopus记录号: 2-s2.0-85043448343
论文题名: Directional Absorption of Parameterized Mountain Waves and Its Influence on the Wave Momentum Transport in the Northern Hemisphere
作者: Xu X. ; Tang Y. ; Wang Y. ; Xue M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 5 起始页码: 2640
结束页码: 2654
语种: 英语
英文关键词: directional wind shear
; gravity wave drag
; mountain waves
; parameterization
; wave momentum transport
Scopus关键词: absorption
; gravity wave
; mesosphere
; mountain region
; Northern Hemisphere
; parameterization
; stratosphere
; stratosphere-troposphere interaction
; troposphere
; wind shear
; China
; Iranian Plateau
; Qinghai-Xizang Plateau
英文摘要: The directional absorption of mountain waves in the Northern Hemisphere is assessed by examination of horizontal wind rotation using the 2.5° × 2.5° European Centre for Medium-Range Weather Forecasts ERA-Interim reanalysis between 2011 and 2016. In the deep layer of troposphere and stratosphere, the horizontal wind rotates by more than 120° all over the Northern Hemisphere primary mountainous areas, with the rotation mainly occurring in the troposphere (stratosphere) of lower (middle to high) latitudes. The rotation of tropospheric wind increases markedly in summer over the Tibetan Plateau and Iranian Plateau, due to the influence of Asian summer monsoonal circulation. The influence of directional absorption of mountain waves on the mountain wave momentum transport is also studied using a new parameterization scheme of orographic gravity wave drag (OGWD) which accounts for the effect of directional wind shear. Owing to the directional absorption, the wave momentum flux is attenuated by more than 50% in the troposphere of lower latitudes, producing considerable orographic gravity wave lift which is normal to the mean wind. Compared with the OGWD produced in traditional schemes assuming a unidirectional wind profile, the OGWD in the new scheme is suppressed in the lower stratosphere but enhanced in the upper stratosphere and lower mesosphere. This is because the directional absorption of mountain waves in the troposphere reduces the wave amplitude in the stratosphere. Consequently, mountain waves are prone to break at higher altitudes, which favors the production of stronger OGWD given the decrease of air density with height. ©2018. 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/114290
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Mesoscale Severe Weather/Ministry of Education, School of Atmospheric Sciences, Nanjing University, Nanjing, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Center for Analysis and Prediction of Storms, University of Oklahoma, Norman, OK, United States
Recommended Citation:
Xu X.,Tang Y.,Wang Y.,et al. Directional Absorption of Parameterized Mountain Waves and Its Influence on the Wave Momentum Transport in the Northern Hemisphere[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(5)