热带气旋“黄蜂”登陆过程诊断分析  

DIAGNOSTIC ANALYSIS OF THE LANDFALL PROCESS TROPICAL CYCLONE “VONGFONG”?

作　　者：梁建茵[1] 陈子通[1] 万齐林[1] 丁伟钰[1] 刘春霞[1] 林爱兰[1] 

机构地区：[1]中国气象局广州热带海洋气象研究所,广东广州510080

出　　处：《热带气象学报》2003年第B09期45-55,共11页Journal of Tropical Meteorology

基　　金：科技部社会公益研究项目2001DIA20026-01资助

摘　　要：应用了高分辨率的卫星TRMM资料以及多种类资料的同化资料对登陆广东吴川的强热带风暴“黄蜂”进行了诊断分析。分析了登陆前阶段和登陆阶段“黄蜂”风场的不对称性、降水分布、热力结构的变化特征,讨论了北方干冷气流和南方西南季风相互作用对“黄蜂”增强和减弱的影响作用。结果表明,热带气旋“黄蜂”在风速分布、降水分布、对流活动等方面存在不对称性。在登陆前阶段“黄蜂”经历了一次强对流云团发展为螺旋云带的过程,降水增加;“黄蜂”登陆阶段,对流迅速减弱,降水明显减少。登陆前阶段的发展与北方小股干冷气流从中层进入,影响了“黄蜂”内部的热力结构,其位势不稳定得到加强有关;登陆阶段,北方干冷气流进入“黄蜂”内部低层以及西南季风水汽输送减弱,导致“黄蜂”迅速减弱。With high-resolution satellite TRMM data and multiple assimilated data, the severe tropical storm 揤ongfong?making landfall on Wuchuan, Guangdong, was diagnostically analyzed, variations of asymmetricity, cloud bands, precipitation distribution and thermodynamic structure are studied for the time before and during the landfall, and the effect of interactions between dry and cold northern airflow and the Southwest Monsoon on the intensification and weakening of 揤ongfong?are discussed. The results show that the storm抯 wind speed and precipitation distribution and convection are asymmetric. Before the landfall, severe convective cloud bands evolved into spiral cloud bands and precipitation increased; during the landfall, convection rapidly weakened and precipitation decreased. In the former phase, a drier and colder flow of air intruded from the middle layer of the storm to affect its inner thermodymic structure and strengthen its potential instability. In the latter phase, however, the airflow entered the lower layer and moisture transfer weakened from the Southwest Monsoon, leading to the rapid weakening of 揤ongfong?

关 键 词：热带气旋 登陆过程 诊断 

分 类 号：P458.124[天文地球—大气科学及气象学]