Orographic effects on South China Sea summer climate
Xu, H; Xie, SP; Wang, Y; Zhuang, W; Wang, D; haimingx@gmail.com
2008
发表期刊METEOROLOGY AND ATMOSPHERIC PHYSICS
ISSN0177-7971
卷号100期号:40547页码:275-289
摘要New satellite observations reveal several distinct features of the South China Sea (SCS) summer climate: an intense low-level southwesterly wind jet off the coast of South Vietnam, a precipitation band on the western flank of the north-south running Annam mountain range, and a rainfall shadow to the east in the western SCS off the east coast of Vietnam. A high-resolution full-physics regional atmospheric model is used to investigate the mechanism for the formation of SCS summer climate. A comparison of the control model simulation with a sensitivity experiment with the mountain range artificially removed demonstrates that the aforementioned features form due to orographic effects of the Annam mountains. Under the prevailing southwesterly monsoon, the mountain range forces the ascending motion on the windward and subsidence on the lee side, giving rise to bands of active and suppressed convection, respectively. On the south edge of the mountain range, the southwesterlies are accelerated to form an offshore low-level wind jet. The mid-summer cooling in the SCS induced by this wind jet further helps reduce precipitation over the central SCS. A reduced-gravity ocean model is used to investigate the ocean response to the orographically induced wind forcing, which is found to be important for the formation of the double-gyre circulation observed in the summer in SCS, in particular for the northern cyclonic circulation. Thus, orography is a key to shaping the SCS summer climate both in the atmosphere and in the ocean.
部门归属[Xu, H.] Nanjing Univ Informat Sci & Technol, Coll Atmospher Sci, Nanjing 210044, Peoples R China; [Xie, S. -P.; Wang, Y.] Univ Hawaii, Int Pacific Res Ctr, Honolulu, HI 96822 USA; [Xie, S. -P.; Wang, Y.] Univ Hawaii, Dept Meteorol, Honolulu, HI 96822 USA; [Zhuang, W.; Wang, D.] Chinese Acad Sci, S China Sea Inst Oceanol, LED, Guangzhou, Peoples R China
学科领域Meteorology & Atmospheric Sciences
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收录类别sci
资助项目LED
WOS记录号WOS:000258675400019
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/5975
专题热带海洋环境国家重点实验室(LTO)
通讯作者haimingx@gmail.com
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Xu, H,Xie, SP,Wang, Y,et al. Orographic effects on South China Sea summer climate[J]. METEOROLOGY AND ATMOSPHERIC PHYSICS,2008,100(40547):275-289.
APA Xu, H,Xie, SP,Wang, Y,Zhuang, W,Wang, D,&haimingx@gmail.com.(2008).Orographic effects on South China Sea summer climate.METEOROLOGY AND ATMOSPHERIC PHYSICS,100(40547),275-289.
MLA Xu, H,et al."Orographic effects on South China Sea summer climate".METEOROLOGY AND ATMOSPHERIC PHYSICS 100.40547(2008):275-289.
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