台风“鲇鱼”环流的风矢量结构变化对其路径突变的影响

Influence of Wind Vector Structure Variation of Typhoon "Catfish" Circulation on Its Pathway Mutation

[目的]研究1013号强台风"鲇鱼"的风矢量结构变化及其对台风路径突变的影响。[方法]根据台风涡旋非对称结构对台风运动产生影响理论,对以1013号超强台风"鲇鱼"中心为坐标原点,300～500 km内850、500 hPa切向旋转速度分解成u、v分量,分析台风的合力运动倾向,探讨1013号强台风"鲇鱼"的风矢量结构变化及其对台风路径突变的影响。[结果]1013号强台风在快速移动阶段时,风矢量存在明显不对称结构;而在原地打转时,风矢量呈对称结构;当ΔU、ΔV及合成风矢出现明显的变化时,表明台风的合力出现变化,台风移动方向将出现突变。500和850 hPa台风中心周围300～500 km附近风速的不对称结构也有利于移动路径的趋向性;ΔU、ΔV及合成风矢,其指向可以作为台风合力运动的方向。[结论]该研究为台风的预防提供参考依据。

[Objective] The research aimed to study the wind vector structure variation of number 1013 strong typhoon ＂catfish＂ and its influence on the pathway mutation.[Method] According to the theory that the unsymmetric structure of typhoon vortex had the influence on the typhoon movement,the center of number 1013 super-strong typhoon ＂catfish＂ was as the coordinate origin,and 850,500 hPa tangential rotation speeds within 300-500 km were broken down into u and v components.The composite force movement tendency of typhoon was analyzed.The wind vector structure variation of number 1013 strong typhoon ＂catfish＂ and its influence on the pathway mutation were discussed.[Result] At the quick movement stage of number 1013 strong typhoon,the wind vector had the obvious unsymmetric structure.When the typhoon walked around in circles,the wind vector presented the symmetric structure.When ΔU,ΔV and composite wind vector had the obvious variation,the composite force of typhoon changed,and the moved direction also would change.The unsymmetric structure of wind speed near 300-500 km of 500 and 850 hPa typhoon centers was favorable for the tendency of moved pathway.The pointed directions of ΔU,ΔV and composite wind vector could be as the composited force movement direction of typhoon.[Conclusion] The research provided the reference basis for typhoon prevention.