高层冷涡的不同结构对台风运动的影响  

THE INFLUENCE OF STRUCTURE OF UPPER-TROPOSPHERIC COLD VORTEX ON TYPHOON MOTION

作　　者：费亮[1] 李小凡[1] 

机构地区：[1]上海台风研究所,上海200030

出　　处：《应用气象学报》1993年第1期1-7,共7页Journal of Applied Meteorological Science

基　　金：国家自然科学基金49070238

摘　　要：通过对不同水平和垂直结构的高层冷涡在台风移动中的作用的对比试验,发现高层冷涡的水平和垂直结构变化会影响台风的运动。对总涡度倾向分布和强度的比较分析,发现正压过程主导台风运动的方向,而斜压过程在某些情况下对台风移速有很大影响。通过各动力项对总涡度倾向贡献的讨论,发现涡度平流对总涡度倾向正中心的贡献主要来自引导气流对非对称涡度场的平流。散度场贡献主要来自行星涡度和非对称散度相关场。最后还得到预报性的结论:台风朝对流层上层的辐合中心或对流层中下层辐散中心方向移动。The role of upper-tropospheric cold vortex with different horizontal and vertical structures inthe process of typhoon movement is studied.It is found that the structural variation of aloft coldvortex will affect the typhoon motion.The analysis shows that barotropic processes dominate indirection of motion,but,under some circumstances,baroclinic processes dominate in its speed.Furthermore,it is also shown that contribution of horizontal vorticity advection to the positivecenter of TVT(total vorticity tendency)comes from the advection of asymmetric vorticity withsteering current,and contribution of divergence field to TVT is mainly from the correlation fieldbetween the planetary vorticity and asymmetric divergence.Finally,it is concluded that withinthe ranging affected by the cold vortex,typhoon will move to the regions of convergence centerin the upper-troposphere or divergence center in the mid-and-lower troposphere.This conclusionis useful to forecasters.

关 键 词：冷涡 结构 台风运动 影响 

分 类 号：P444[天文地球—大气科学及气象学]