华南地区热带气旋登陆前强度突变的大尺度环境诊断分析

基金项目: 国家自然科学基金项目(402750184997501440333025)资助

THE DIAGNOSTIC ANALYSIS OF THE RAPID CHANGE IN TROPICAL CYCLONES INTENSITY BEFORE LANDFALL IN SOUTH CHINA

1.
Nanjing University of Information Science & Technology, Nanjing 210044, China;Shanghai Typhoon Institute/CMA, Shanghai 200030, China
2.
Shanghai Typhoon Institute/CMA, Shanghai 200030, China
3.
Nanjing University of Information Science & Technology, Nanjing 210044, China

摘要: 利用每6小时一次的NCEP再分析资料, 对华南地区登陆前突然减弱和突然增强的两类热带气旋(TC)进行大尺度诊断分析, 结果表明:(1)突然增强的TC位于副高的西南侧或南侧, 低空有明显的西南气流卷入TC内部, 而突然减弱的TC基本在副高西侧或西北侧;(2)突然增强TC的低空辐合、高空辐散均较强;(3)充足的水汽输送是TC登陆前突然增强的另一重要原因。
- 登陆热带气旋 /
- 强度突变 /
- 大尺度诊断分析
Abstract: NCEP reanalysis data are used in this paper to diagnose large-scale environmental flows of tropical cyclones (TC), whose intensity change rapidly before landfall in South China. Results show (1) TCs that intensify rapidly are located at the south or southwest of subtropical high and the southwest current are entangled in the center of TC in lower troposphere (850 hPa). While most of TCs that decrease rapidly are at the northwest of subtropical high; (2) there is a favorable environment flow for these rapid intense TCs, which is strong convergence at the low level and remarkable divergence at the upper level; (3) the rapid intensification of TC is related to the sufficient water vapor transportation.
- tropical cyclone landfall /
- intensity rapid change /
- large-scale environmental flow diagnostic analysis

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