DOI: 10.1002/2017JD027034
论文题名: Impacts of northern Tibetan Plateau on East Asian summer rainfall via modulating midlatitude transient eddies
作者: Deng J. ; Xu H. ; Shi N. ; Zhang L. ; Ma J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 16 起始页码: 8667
结束页码: 8685
语种: 英语
英文关键词: East Asian summer climate
; modeling
; Tibetan Plateau
; transient eddy activity
英文摘要: Roles of the Tibetan Plateau (TP) in forming and changing the seasonal Asian climate system have been widely explored. However, little is known about modulation effects of the TP on extratropical transient eddies (TEs) and subsequent synoptic responses of the East Asian rainfall. In this study, the Community Atmosphere Model version 5.1 coupled with a slab ocean model is employed to highlight the important role of the TP in regulating the upper-tropospheric transient wave train. Comparison between sensitivity experiments with and without the TP shows that the northern TP excites a strong anomalous anticyclone, which shifts the upper-level East Asian westerly jet northward and helps transfer barotropic and baroclinic energy from the mean flow to the synoptic TE flow. The transient wave train is primarily shifted northward by northern TP and is forced to propagate southeastward along the eastern flank of the TP until reaching eastern China. Before the strengthening of monsoonal southerlies, the TP-modulated transient wave train cools the troposphere, which decreases the static stability over northern China. Meanwhile, the associated anomalous warm advection induces ascending motion, leading to excessive rainfall by releasing unstable energy as the southerly strengthens. Due to the southeastward propagation of the wave train, anomalous heavy rainfall subsequently appears over eastern China from north to south, which increases day-to-day rainfall variation in this region. Additionally, occurrence of this upper-tropospheric transient wave train associated with low-level southerly peak is substantially increased by northern TP. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: 41490643
; 41575077
; 41705054
; BK20170942
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62608
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: Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China; National Demonstration Center for Experimental Atmospheric Science and Environmental Meteorology Education, Nanjing University of Information Science and Technology, Nanjing, China
Recommended Citation:
Deng J.,Xu H.,Shi N.,et al. Impacts of northern Tibetan Plateau on East Asian summer rainfall via modulating midlatitude transient eddies[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(16)