| A DYNAMICAL INTERPRETATION OF THE WIND FIELD IN TROPICAL CYCLONES |
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| 作者姓名： | 郝世峰 崔晓鹏 潘劲松 周冠博 胡波 |
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| 作者单位： | 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) |
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| 基金项目： | National Basic Research Program of China (973 Program)，Major Projects for Science and Technology Development of Zhejiang Province，Natural Science Foundation Project of Zhejiang Province |
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| 摘 要： | Based on the primitive equations in polar coordinates, supposing 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.
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| 关 键 词： | 热带气旋 动力学解释 风场 表面压力分布 解释方法 运动速度 线性变化 原始方程 |
A DYNAMICAL INTERPRETATION OF THE WIND FIELD IN TROPICAL CYCLONES |
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| HAO Shi-feng,CUI Xiao-peng,PAN Jin-song,ZHOU Guan-bo and HU Bo.A DYNAMICAL INTERPRETATION OF THE WIND FIELD IN TROPICAL CYCLONES[J].Journal of Tropical Meteorology,2009,15(2):210-216. |
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| Authors: | HAO Shi-feng CUI Xiao-peng PAN Jin-song ZHOU Guan-bo and HU Bo |
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| Institution: | 1. Zhejiang Meteorological Observatory,Hangzhou 310017 China
2. LACS,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 China |
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| Abstract: | 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. |
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| Keywords: | tropical cyclones strong wind dynamical interpretation |
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