A DYNAMICAL INTERPRETATION OF THE WIND FIELD IN TROPICAL CYCLONES  

作　　者：郝世峰 崔晓鹏 潘劲松 周冠博 胡波 

机构地区：[1]Zhejiang Meteorological Observatory [2]LACS, Institute of Atmospheric Physics, Chinese Academy of Sciences

出　　处：《Journal of Tropical Meteorology》2009年第2期210-216,共7页热带气象学报（英文版）

基　　金：National Basic Research Program of China (973 Program) (2009CB421505);Major Projects for Science and Technology Development of Zhejiang Province (2007C13G1610002);Natural Science Foundation Project of Zhejiang Province(Y505286)

摘　　要：Based on the primitive equations in polar coordinates and with the supposition that parcel velocity in tropical cyclones is in linear variation and that the distribution of surface pressure agrees with the Fujita formula, a set of equations are derived, which describe the impact of perturbations of central pressure, position of tropical cyclones, direction and velocity of movement of tropical cyclones on the wind field. It is proved that the second order approximation of the kinetic energy of tropical cyclones can be described by the equations under linear approximation. Typhoon Wipha (2007) is selected to verify the above interpretation method, and the results show that the interpretation method of the wind field could give very good results before the landfall of tropical cyclones, while making no apparent improvement after the landfall. The dynamical interpretation method in this paper is applicable to improving the forecasts of the wind field of tropical cyclones close to the coast.Based on the primitive equations in polar coordinates and with the supposition that parcel velocity in tropical cyclones is in linear variation and that the distribution of surface pressure agrees with the Fujita formula, a set of equations are derived, which describe the impact of perturbations of central pressure, position of tropical cyclones, direction and velocity of movement of tropical cyclones on the wind field. It is proved that the second order approximation of the kinetic energy of tropical cyclones can be described by the equations under linear approximation. Typhoon Wipha （2007） is selected to verify the above interpretation method, and the results show that the interpretation method of the wind field could give very good results before the landfall of tropical cyclones, while making no apparent improvement after the landfall. The dynamical interpretation method in this paper is applicable to improving the forecasts of the wind field of tropical cyclones close to the coast.

关 键 词：tropical cyclones strong wind dynamical interpretation 

分 类 号：P444[天文地球—大气科学及气象学] P434