0414号台风登陆过程的诊断与模拟分析  

Modeling study and diagnostic analysis of the landfall process of No.0414 typhoon

作　　者：陈丽芳[1] 薛根元[2] 高坤[3] 

机构地区：[1]杭州市气象局,浙江杭州310008 [2]浙江省气象局,浙江杭州310002 [3]浙江大学地球科学系,浙江杭州310027

出　　处：《浙江大学学报（理学版）》2007年第5期593-600,共8页Journal of Zhejiang University（Science Edition）

基　　金：浙江省气象科技计划项目资助(20069nolo)

摘　　要：利用非静力平衡中尺度模式MM5对0414号台风从2004年8月11日00时～14日00时（UTC）进行模拟，结合浙江省稠密的AWS资料、雷达资料、卫星云图对这次台风登陆过程进行分析，结果表明中尺度模式对登陆台风的路径、强度、降水具有较强的模拟预报能力．台风登陆前副热带高压呈坝状发展，副高南缘超地转低空急流加强，以及登陆前台风周围的风速呈现东北象限最大，西南象限最小的分布状况，是造成台风登陆前加速西折的原因．高层辐合中心的维持有利于台风强度增强．台风螺旋雨带前沿存在中尺度热力性低压，在海陆间中尺度锋区的热力条件支持下，低压扰动获得发展，降水加强．水汽输送通道维持与内陆水体和饱和湿土的潜热输送是台风登陆后久留不散的原因．台风登陆后水汽源提供由孟加拉湾和南海转变为西太平洋．Using the NCAR/PSU nonhydrostatic mesoscale model（MM5）, the landfall process of No. 0414 typhoon from August 11 to 14 in 2004 was simulated, and with AWS data, Radar and satellite data, the landfall process was diagnostically analyzed. Results show that the model successfully simulated the landfall process of No. 0414 typhoon. The subtropical high was like a bam before typhoon landed. Supergeostrophic low jet in the south of the subtropical high became stronger, and the wind speed in northeast quadrant of typhoon was maximum, and in south west quadrant was minimum. These made typhoon accelerate to the west. Conergence developing in upper air and middle-low air were useful for the development of typhoon. There were thermodynamic mesocyclone in the front of spiral rain band. Because of the meso front between land and sea, the disturbances developed. Moisture channel keeping and the latent heat coming from inland water and saturated soil were the reasons for the typhoon keeping after it landed. And after typhoon landed, vapour came from the west of the Pacific Ocean instead of the Bengal gulf and the South China Sea.

关 键 词：台风 登陆 数值模拟 诊断分析 

分 类 号：P458[天文地球—大气科学及气象学]