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A DYNAMICAL INTERPRETATION OF THE WIND FIELD IN TROPICAL CYCLONES WITH THE CONSIDERATION OF OROGRAPHIC FACTORS |
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| Authors: | HAO Shi-feng PAN Jin-song YUE Cai-jun CUI Xiao-peng and YANG Shi-fang |
| Institution: | 1. Zhejiang Meteorology Observatory, Hangzhou 310017 China 2. Shanghai Typhoon Institute of China Meteorological Administration, Shanghai 200030 China 3. LACS, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 China |
| Abstract: | Based on the barotropic primitive equation in the polar coordinate system and the appropriate assumption, we obtained the mathematical equation of orographic forcing on unit mass air parcel. With the consideration of the frictional stress of the sea and land, supposing that parcel velocity in tropical cyclones is in linear variation and that the distribution of surface pressure is circular, a set of equations are derived, which describe the impact of orographic slope error, the central pressure error and position error of tropical cyclones on the wind field in the tropical cyclone. Typhoon Wipha (2007) is selected to verify the above interpretation method. The results show that the orographic slope, the frictional coefficient, the intensity and position of the cyclone are the important factors which have great influence on the interpretation of wind information about tropical cyclones. The dynamic interpretation method gives very good results,especially for the coastal area. It is applicable to improving the forecasts of the wind field in tropical cyclones. |
| Keywords: | tropical cyclone orographic slope frictional stress strong wind dynamic interpretation |
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