Effects of the East Asian Summer Monsoon on Tropical Cyclone Genesis over the South China Sea on an Interdecadal Time Scale
Wang, X; Zhou, W; Li, CY; Wang, DX; wenzhou@cityu.edu.hk
2012
发表期刊ADVANCES IN ATMOSPHERIC SCIENCES
ISSN0256-1530
卷号29期号:2页码:249-262
摘要Tropical cyclone (TC) genesis over the South China Sea (SCS) during 1965-2004 was analyzed. The locations of TC genesis display evident seasonal changes, with the mean position of formation situated north of 15 degrees N in summer (June-July-August) and south of 15 degrees N in autumn (September-October-November). The TC genesis in summer underwent dramatic interdecadal variations, with more and less TC frequency during 1965-1974/1995-2004 and 1979-1993, respectively. In contrast, a significant interannual variation of TC genesis with a period of similar to 4 years was observed in autumn. This study investigated the relationship of SCS TC genesis to the East Asian jet stream (EAJS) and the western North Pacific subtropical high (WNPSH) on an interdecadal time scale. Analysis and comparison of the impacts of the EAJS and the WNPSH on vertical wind shear changes indicate that changes in the WNPSH and EAJS intensity rather than EAJS meridional location are responsible for changes in TC genesis on an interdecadal time scale. Corresponding to a weaker EAJS, anomalous Rossby wave energy at upper levels displays equatorward propagation at midlatitudes and poleward propagation in the subtropics. This induces anomalous convergence and divergence of wave activity fluxes in East Asia around 30 degrees N and the SOS, respectively. The anomalous divergence of wave activity fluxes reduces easterlies at upper levels over the SCS, which is favorable to TC genesis.
部门归属[Wang Xin; Zhou Wen] City Univ Hong Kong, Sch Energy & Environm, Guy Carpenter Asia Pacific Climate Impact Ctr, Hong Kong 00852, Hong Kong, Peoples R China; [Li Chongyin] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China; [Li Chongyin] PLA Univ Sci & Technol, Meteorol Coll, Nanjing 210093, Jiangsu, Peoples R China; [Wang Dongxiao] Chinese Acad Sci, State Key Lab Trop Oceanog, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
关键词Tropical Cyclone Subtropical Jet Stream South China Sea
学科领域Meteorology & Atmospheric Sciences
语种英语
资助项目LTO
WOS记录号WOS:000300530700004
引用统计
被引频次:20[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10201
专题热带海洋环境国家重点实验室(LTO)
通讯作者wenzhou@cityu.edu.hk
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Wang, X,Zhou, W,Li, CY,et al. Effects of the East Asian Summer Monsoon on Tropical Cyclone Genesis over the South China Sea on an Interdecadal Time Scale[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2012,29(2):249-262.
APA Wang, X,Zhou, W,Li, CY,Wang, DX,&wenzhou@cityu.edu.hk.(2012).Effects of the East Asian Summer Monsoon on Tropical Cyclone Genesis over the South China Sea on an Interdecadal Time Scale.ADVANCES IN ATMOSPHERIC SCIENCES,29(2),249-262.
MLA Wang, X,et al."Effects of the East Asian Summer Monsoon on Tropical Cyclone Genesis over the South China Sea on an Interdecadal Time Scale".ADVANCES IN ATMOSPHERIC SCIENCES 29.2(2012):249-262.
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