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学科主题: Oceanography
题名: Diagnosis of the ENSO modulation of tropical cyclogenesis over the southern South China Sea using a genesis potential index
作者: Wang, L ; Zhang, QW ; Li, WB
通讯作者: wanglei.hkust@gmail.com
关键词: tropical cyclone ; southern South China Sea ; ENSO ; genesis potential index
刊名: ACTA OCEANOLOGICA SINICA
发表日期: 2012
卷: 31, 期:5, 页:54-68
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; Zhang Qiongwan; Li Weibiao] Sun Yat Sen Univ, Sch Environm Sci & Engn, Dept Atmospher Sci, Guangzhou 510275, Guangdong, Peoples R China; [Zhang Qiongwan] China Meteorol Adm, Inst Trop & Marine Meteorol, Guangzhou 510058, Guangdong, Peoples R China
项目归属: LTO
摘要: The modulation of tropical cyclogenesis over the southern South China Sea (SSCS) by the El Nio-Southern Oscillation (ENSO) is examined in October-December (OND), when tropical cyclone (TC) activities are most active in this region. The results reveal that there were more TCs formed over the SSCS during La Nia years and less TCs during El Nio years. How different environmental factors (including low-level vorticity, mid-level relative humidity, vertical wind shear, and potential intensity) contribute to this influence is investigated, using a genesis potential (GP) index developed by Emanuel and Nolan. Composite anomalies of the GP index are produced for El Nio and La Nia years separately, which could account for the changes of TC frequency over the SSCS in different ENSO phases. The degree of contribution by each factor is determined quantitatively by producing composites of modified indices in which only one of the contributing factors varies, with the others set to climatology. The results show that the mid-level relative humidity makes the largest contribution to the ENSO modulation of tropical cyclogenesis over the SSCS. Although warmer sea surface temperatures (SSTs) and larger amount of evaporation from the ocean surface were observed over the SSCS during El Nio years, anomalous descending motions due to the anomalous Walker circulations inhibited the upward transports of water vapor and led to less moisture contents in the middle troposphere, which suppressed TC formations.
语种: 英语
WOS记录号: WOS:000309856200006
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10113
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; Zhang, QW; Li, WB.Diagnosis of the ENSO modulation of tropical cyclogenesis over the southern South China Sea using a genesis potential index,ACTA OCEANOLOGICA SINICA,2012,31(5):54-68
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