Diagnosis of dynamic process over rainband of landfall typhoon  

作　　者：冉令坤 杨文霞 楚艳丽 

机构地区：[1]Institute of Atmospheric Physics,Chinese Academy of Sciences [2]Hebei Weather Modification Office [3]Hebei Laboratory of Ecological and Enviromental Monitoring [4]Institute of Urban Meteorology,CMA

出　　处：《Chinese Physics B》2010年第7期611-623,共13页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No. 2009CB421505);the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (KZCX2-YW-206-4);the National Natural Science Foundation of China(Grant Nos. 40875032 and 40875002);the Major Foreland Project of IAP (IAP07201);the National Science and Technology Project,China (GYH200706042)

摘　　要：This paper introduces a new physical parameter -- thermodynamic shear advection parameter combining the perturbation vertical component of convective vorticity vector with the coupling of horizontal divergence perturbation and vertical gradient of general potential temperature perturbation. For a heavy-rainfall event resulting from the landfall typhoon ＇Wipha＇, the parameter is calculated by using National Centres for Enviromental Prediction/National Centre for Atmospheric Research global final analysis data. The results showed that the parameter corresponds to the observed 6 h accumulative rainband since it is capable of catching hold of the dynamic and thermodynamic disturbance in the lower troposphere over the observed rainband. Before the typhoon landed, the advection of the parameter by basic-state flow and the coupling of general potential temperature perturbation with curl of Coriolis force perturbation are the primary dynamic processes which are responsible for the local change of the parameter. After the typhoon landed, the disturbance is mainly driven by the combination of five primary dynamic processes. The advection of the parameter by basic-state flow was weakened after the typhoon landed.This paper introduces a new physical parameter -- thermodynamic shear advection parameter combining the perturbation vertical component of convective vorticity vector with the coupling of horizontal divergence perturbation and vertical gradient of general potential temperature perturbation. For a heavy-rainfall event resulting from the landfall typhoon ＇Wipha＇, the parameter is calculated by using National Centres for Enviromental Prediction/National Centre for Atmospheric Research global final analysis data. The results showed that the parameter corresponds to the observed 6 h accumulative rainband since it is capable of catching hold of the dynamic and thermodynamic disturbance in the lower troposphere over the observed rainband. Before the typhoon landed, the advection of the parameter by basic-state flow and the coupling of general potential temperature perturbation with curl of Coriolis force perturbation are the primary dynamic processes which are responsible for the local change of the parameter. After the typhoon landed, the disturbance is mainly driven by the combination of five primary dynamic processes. The advection of the parameter by basic-state flow was weakened after the typhoon landed.

关 键 词：thermodynamic shear advection parameter convective vorticity vector horizontal divergence general potential temperature 

分 类 号：P444[天文地球—大气科学及气象学]