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学科主题: Meteorology & Atmospheric Sciences
题名: Potential vorticity diagnosis of tropical cyclone Usagi (2001) genesis induced by a mid-level vortex over the South China Sea
作者: Yuan, JN ; Wang, DX
通讯作者: yuanjn@grmc.gov.cn
刊名: METEOROLOGY AND ATMOSPHERIC PHYSICS
发表日期: 2014
卷: 125, 期:41641, 页:75-87
收录类别: sci
部门归属: [Yuan, Jinnan ; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou 510301, Guangdong, Peoples R China ; [Yuan, Jinnan] China Meteorol Adm, Guangdong Prov Key Lab Reg Numer Weather Predict, Guangzhou Inst Trop & Marine Meteorol, Guangzhou 510080, Guangdong, Peoples R China ; [Yuan, Jinnan] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
项目归属: LTO
资助者: National Basic Research Program of China (973 Program) [2011CB403504]; National Natural Science Foundation of China [40875026, 91015011, 91215302]
摘要: In this study, we first show that tropical cyclone (TC) Usagi evolved from a mid-level vortex over the South China Sea (SCS) in August 2001. The initial disturbance of TC Usagi had a maximum potential vorticity (PV) near 500 hPa, and an anticyclonic circulation with a cold core near the surface. The cyclonic circulation and its warm core of the mid-level vortex developed gradually downward toward the surface when environmental easterly and dry air intruded from the upper troposphere; finally, the mid-level vortex evolved into TC Usagi under favorable environment conditions such as weak vertical wind shear, deep moist layer, etc. To investigate the dynamic and thermodynamic processes during TC Usagi genesis, the technique of piecewise PV inversion is employed. The results show that the actions of upper-layer PV and potential temperature anomalies were not important in TC Usagi genesis. Surface-layer thermal anomalies mainly produced negative disturbances of temperature at the vortex center below 800 hPa, which was unfavorable to the genesis of a cyclonic circulation near the surface. Middle-to-lower-layer latent heat played a key role in TC Usagi genesis and downward development of dynamic and thermodynamic processes. The actions of dry air intrusion from the upper troposphere, environmental westerly changing into easterly in the middle and lower troposphere, and baroclinic structure of the vortex were also important. The cyclonic circulation of the mid-level vortex could develop downward quickly from the middle troposphere toward the surface. However, whether the warm core of the vortex developed near the surface depended on the combined actions of surface-layer thermal anomaly and middle-to-lower-layer latent heat. Finally, we present a conceptual model of TC Usagi genesis induced by a mid-level vortex over the SCS.
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WOS记录号: WOS:000338633200005
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10535
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Yuan, JN; Wang, DX.Potential vorticity diagnosis of tropical cyclone Usagi (2001) genesis induced by a mid-level vortex over the South China Sea,METEOROLOGY AND ATMOSPHERIC PHYSICS,2014,125(41641):75-87
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