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Impact of tropical cyclone development on the instability of South Asian High and the summer monsoon onset over Bay of Bengal
[Wu, Guoxiong; Ren, Suling; Bao, Qing; Liu, Boqi; Liu, Yimin] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Sci & Geophys Fluid Dynam, Beijing 100029, Peoples R China; [Ren, Suling; Xu, Jianmin] China Meteorol Adm, Natl Satellite Meteorol Ctr, Beijing 100081, Peoples R China; [Ren, Suling] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China; [Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Liu, Boqi] Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME, Nanjing 210044, Jiangsu, Peoples R China; lym@lasg.iap.ac.cn
2013
Source PublicationCLIMATE DYNAMICS
ISSN0930-7575
Volume41Issue:41892Pages:2603-2616
AbstractThis 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.
DepartmentLTO
KeywordZonal Asymmetric Forcing Tropical Cyclone Instability South Asian High
Subject AreaMeteorology & Atmospheric Sciences
Funding OrganizationWe thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088. ; We thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088. ; We thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088. ; We thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088.
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Language英语
Funding OrganizationWe thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088. ; We thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088. ; We thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088. ; We thank the two anonymous reviewers for their constructive comments and suggestions. This study was jointly supported by the MOST Programme 2010CB950403 and 2012CB417203, CAS project XDA10010402 and NSF of China Projects 40925015 and 41275088.
WOS IDWOS:000326244700022
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/10873
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorlym@lasg.iap.ac.cn
Recommended Citation
GB/T 7714
[Wu, Guoxiong,Ren, Suling,Bao, Qing,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,2013,41(41892):2603-2616.
APA [Wu, Guoxiong.,Ren, Suling.,Bao, Qing.,Liu, Boqi.,Liu, Yimin] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Sci & Geophys Fluid Dynam, Beijing 100029, Peoples R China.,...&lym@lasg.iap.ac.cn.(2013).Impact of tropical cyclone development on the instability of South Asian High and the summer monsoon onset over Bay of Bengal.CLIMATE DYNAMICS,41(41892),2603-2616.
MLA [Wu, Guoxiong,et al."Impact of tropical cyclone development on the instability of South Asian High and the summer monsoon onset over Bay of Bengal".CLIMATE DYNAMICS 41.41892(2013):2603-2616.
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