9012号热带气旋登陆后维持不消的动力机制  

THE DYNAMIC MECHANISM MAINTAING TYPHOON 9012 IN ACTIVE STAGE LONG AFTER LANDFALL

作　　者：梁力[1] 吴志伟[1] 严光华[1] 

机构地区：[1]福建省气象科学研究所,福建省气象局

出　　处：《热带气象学报》1995年第1期26-34,共9页Journal of Tropical Meteorology

基　　金：福建省科委"关于9012号台风几个特殊问题的研究"攻关项目

摘　　要：利用２．５×２．５格距的风场及气压资料，计算分析９０１２号热带气旋登陆后维持６５小时不消的各标准时次的角动量收支。得到的结果是：９０１２号热带气旋登陆后，进入一个相对稳定的鞍型场的中心，低层有西南风急流将大量潮湿空气卷入热带气旋，为其提供充足的潜热能，北侧弱冷空气的侵入，为其提供了斜压能量；而对流层上部气旋４°－８°半径上的地转角动量的涡旋输送及β项产生的气旋角动量的输入，则是气旋中心气压和最大风速维持的直接因素。Using 2.5×2.5 winds and presure,the angular momentum budgets are studied in this paper for TC 9012(yancy)which was kept active 65 hours after landfall.It is found that the inland TC 9012 moved into the center of a relatively stable saddle,in which large amount of humid air was entrained into the storm from the southerly jet at low-level to build up the energy of latent heat,the weak cold air coming from the north provided it with baroclinic energy,while the vorticity transfer of geostrophic angular momentum on the radius 4°-8°from the cyclone center at upper troposphere and the input of cyclonic angular momentum produced by the β term are immediate factors maintaining the central pressure and maximum winds.

关 键 词：热带气旋 角动量输送 动力机制 

分 类 号：P444[天文地球—大气科学及气象学]