globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-013-1766-0
Scopus记录号: 2-s2.0-84886718020
论文题名:
Impact of tropical cyclone development on the instability of South Asian High and the summer monsoon onset over Bay of Bengal
作者: Wu G.; Ren S.; Xu J.; Wang D.; Bao Q.; Liu B.; Liu Y.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期:2017-09-10
起始页码: 2603
结束页码: 2616
语种: 英语
英文关键词: Instability ; South Asian High ; Tropical cyclone ; Zonal asymmetric forcing
英文摘要: This paper analyzes the evolution of the South Asian High (SAH) during and after the development of tropical cyclone Neoguri over the South China Sea (SCS) in mid-April 2008, the formation of tropical storm Nargis over the Bay of Bengal (BOB) in late April, and the Asian summer monsoon onset, as well as their interrelationships. Numerical sensitivity experiments are conducted to explore the underlying mechanism responsible for these seasonal transitions in 2008. It is demonstrated that strong latent heating related with tropical cyclone activities over the SCS can enhance the development of the SAH aloft and generate zonal asymmetric potential vorticity (PV) forcing, with positive vorticity advection to its east and negative advection to its west. Following the decay of the tropical cyclone, this asymmetric forcing leads to instability development of the SAH, presenting as a slowly westward-propagating Rossby wave accompanied by a westward shift of the high PV advection. A strong upper tropospheric divergence on the southwest of the SAH also shifts westward, while positive PV eddies are shed from the high PV advection and eventually arrives in the southern BOB. Such synoptic patterns provide favorable pumping conditions for local cyclonic vorticity to develop. The latent heating release from the cyclogenesis further intensifies the upper-layer divergence, and the lower and upper circulations become phase locked, leading to the explosive development of the tropical cyclone over the southern BOB. Consequently, a tropical storm is generated and the BOB summer monsoon commences. © 2013 Springer-Verlag Berlin Heidelberg.
资助项目: NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54735
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作者单位: State Key Lab of Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; National Satellite Meteorological Center, China Meteorological Administration, Beijing, 100081, China; Graduate University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academic of Sciences, Guangzhou, 510301, China; Key Laboratory of Meteorological Disaster of Ministry of Education (KLME), Nanjing University of Information Science and Technology, Nanjing, 210044, China

Recommended Citation:
Wu G.,Ren S.,Xu J.,et al. Impact of tropical cyclone development on the instability of South Asian High and the summer monsoon onset over Bay of Bengal[J]. Climate Dynamics,2013-01-01,41(2017-09-10)
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