A DYNAMICAL INTERPRETATION OF THE WIND FIELD IN TROPICAL CYCLONES

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.

作 者： HAO Shi-feng CUI Xiao-peng PAN Jin-song ZHOU Guan-bo HU Bo   作者單位： HAO Shi-feng,PAN Jin-song,HU Bo(Zhejiang Meteorological Observatory,Hangzhou 310017 China)

CUI Xiao-peng,ZHOU Guan-bo(LACS,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 China) 

刊 名： 熱帶氣象學報（英文版）  英文刊名： JOURNAL OF TROPICAL METEOROLOGY  年，卷(期)： 2009 15(2)  分類號： P435  關鍵詞： tropical cyclones   strong wind   dynamical interpretation  

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