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学科主题: Oceanography
题名: Diagnosis of seasonal variations of tropical cyclogenesis over the South China Sea using a genesis potential index
作者: Wang, L ; Pan, XM
通讯作者: wanglei.hkust@gmail.com
关键词: tropical cyclone ; seasonal variation ; South China Sea monsoon ; GP index
刊名: JOURNAL OF OCEAN UNIVERSITY OF CHINA
发表日期: 2012
卷: 11, 期:3, 页:267-278
部门归属: [Wang Lei] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Wang Lei] State Ocean Adm, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, Zhejiang, Peoples R China; [Wang Lei; Pan Xiumei] Sun Yat Sen Univ, Sch Environm Sci & Engn, Dept Atmospher Sci, Guangzhou 510275, Guangdong, Peoples R China; [Pan Xiumei] China Meteorol Adm, Inst Trop & Marine Meteorol, Guangzhou 510058, Guangdong, Peoples R China
项目归属: LTO
摘要: This study examines the seasonal variations of tropical cyclogenesis over the South China Sea (SCS) using a genesis potential (GP) index developed by Emanuel and Nolan. How different environmental factors (including low-level vorticity, mid-level relative humidity, vertical wind shear, and potential intensity) contribute to these variations is investigated. Composite anomalies of the GP index are produced for the summer and winter monsoons separately. These composites replicate the observed seasonal variations of the observed frequency and location of tropical cyclogenesis over the SCS. The degree of contribution by each factor in different regions is determined quantitatively by producing composites of modified indices in which only one of the contributing factors varies, with the others set to climatology. Over the northern SCS, potential intensity makes the largest contributions to the seasonal variations in tropical cyclogenesis. Over the southern SCS, the low-level relative vorticity plays the primary role in the seasonal modulation of tropical cyclone (TC) genesis frequency, and the vertical wind shear plays the secondary role. Thermodynamic factors play more important roles for the seasonal variations in tropical cyclogenesis over the northern SCS, while dynamic factors are more important in the seasonal modulation of TC genesis frequency over the southern SCS.
语种: 英语
WOS记录号: WOS:000306953300002
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10129
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Recommended Citation:
Wang, L; Pan, XM.Diagnosis of seasonal variations of tropical cyclogenesis over the South China Sea using a genesis potential index,JOURNAL OF OCEAN UNIVERSITY OF CHINA,2012,11(3):267-278
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