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| DCT ANALYSIS DISTRIBUTION FEATURES OF NEAR-SURFACE WIND FIELDS DURING THE LANDFALL OF VONGFONG | |
| 作者姓名： | 李江南 王安宇 杨兆礼 李国丽 吴池胜 侯尔滨 |
| 作者单位： | Department of Atmospheric Sciences，Zhongshan University，Guangzhou 510275 China，Department of Atmospheric Sciences，Zhongshan University，Guangzhou 510275 China，Guangzhou Institute of Tropical and Oceanic Meteorology，CMA，Guangzhou 510080 China，Department of Atmospheric Sciences，Zhongshan University，Guangzhou 510275 China，Department of Atmospheric Sciences，Zhongshan University，Guangzhou 510275 China，Macao Geophysical and Meteorological Bureau，Macao，China |
| 基金项目： | Special Fund Project for Social Benefit Research Study on the Monitoring and Predicting Techniques of Desasters by landding typhoons in China (2002DCA20026-01)，Knowledge Innovation Project of The Chinese Academy of Sciences (ZKCXZ-SW-210) |
| 摘 要： | 1 INTRODUCTION The typhoon is a destructive weather phenomenon that stands at the top of ten major natural disasters1]. Typhoon-related damages are the immediate consequences of weather it brings forth, which include heavy rain, strong winds and storm surges (water gain). They cause flash floods, bring down houses and break through dams1]. Of the research on typhoons for the recent 10 years2], new advances have been reported on abrupt changes in the motion, structure and intensity of… |
| 关 键 词： | 离散余弦变换 地表风 台风 气流 |
DCT ANALYSIS DISTRIBUTION FEATURES OF NEAR-SURFACE WIND FIELDS DURING THE LANDFALL OF VONGFONG |
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| LI Jiang-nan,WANG An-yu,YANG Zhao-li,LI Guo-li,WU Chi-sheng and HAO I-pan.DCT ANALYSIS DISTRIBUTION FEATURES OF NEAR-SURFACE WIND FIELDS DURING THE LANDFALL OF VONGFONG[J].Journal of Tropical Meteorology,2003,9(2):143-151. | |
| Authors: | LI Jiang-nan WANG An-yu YANG Zhao-li LI Guo-li WU Chi-sheng and HAO I-pan |
| Institution: | 1. Department of Atmospheric Sciences, Zhongshan University, Guangzhou 510275 China 2. Guangzhou Institute of Tropical and Oceanic Meteorology, CMA, Guangzhou 510080 China 3. Macao Geophysical and Meteorological Bureau, Macao, China |
| Abstract: | Based on the QuikSCAT data, the features of surface wind distribution of the typhoon Vongfong landfall process are analyzed. We have also studied the variance spectral configuration of the surface wind field using DCT (Discrete Cosine Transform). The conclusions are as follows: The near-surface wind field is highly asymmetric; the variance components of asymmetric surface wind field depend mainly on the airflow direction of wavenumber 1 and 2. When the typhoon moves west, there are two wave spectral centers lining up in the zonal direction, mainly the airflow from zonal wavenumber 2 and meridional wavenumber 2; when it moves north, there are two wave spectral centers in a meridional array, mainly the airflow from zonal wavenumber 1 and meridional wavenumber 2. The airflow for wavenumber 1 mainly contributes to the variance of the tangential wind while that for wavenumber 2 to the variance of the radial wind. The asymmetrical distribution changes with the large-scale environment and self-rotating circulation around the typhoon. When it approached land, the associated gale appears in front portion in the advancing direction of the storm. It is in effect similar to the model of Chen Lian-shou for typhoon-related gales NNW on the left front portion and SE on the right front portion. |
| Keywords: | wind distribution asymmetric spectral configuration DCT |
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