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| A STUDY ON VARIABLE QUANTITATIVE PRECIPITATION ESTIMATION USING DOPPLER RADAR DATA | |
| 作者姓名： | 冀春晓 陈联寿 徐祥德 赵放 吴孟春 |
| 作者单位： | Zhejiang Institute of Meteorological Sciences;Chinese Academy of Meteorological Sciences;Chinese Academy of Meteorological Sciences;Chinese Academy of Meteorological Sciences;Wenzhou Meteorological Bureau |
| 基金项目： | Key Project of Social Development in Zhejiang Province (2006C13025, 2007C13G1610002) |
| 摘 要： | With the pros and cons of the traditional optimization and probability pairing methods thoroughly considered, an improved optimal pairing window probability technique is developed using a dynamic relationship between the base reflectivity Z observed by radar and real time precipitation I by rain gauge. Then, the Doppler radar observations of base reflectivity for typhoons Haitang and Matsa in Wenzhou are employed to establish various Z-I relationships, which are subsequently used to estimate hourly precipitation of the two typhoons. Such estimations are calibrated by variational techniques. The results show that there exist significant differences in the Z-I relationships for the typhoons, leading to different typhoon precipitation efficiencies. The typhoon precipitation estimated by applying radar base reflectivity is capable of exhibiting clearly the spiral rain belts and mesoscale cells, and well matches the observed rainfall. Error statistical analyses indicate that the estimated typhoon precipitation is better with variational calibration than the one without. The variational calibration technique is able to maintain the characteristics of the distribution of radar-estimated typhoon precipitation, and to significantly reduce the error of the estimated precipitation in comparison with the observed rainfall. |
| 关 键 词： | 台风 天气过程 预报 雷达 |
A STUDY ON VARIABLE QUANTITATIVE PRECIPITATION ESTIMATION USING DOPPLER RADAR DATA |
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| JI Chun-xiao,CHEN Lian-shou,XU Xiang-de,ZHAO Fang and WU Meng-chun.A STUDY ON VARIABLE QUANTITATIVE PRECIPITATION ESTIMATION USING DOPPLER RADAR DATA[J].Journal of Tropical Meteorology,2008,14(2):109-112. | |
| Authors: | JI Chun-xiao CHEN Lian-shou XU Xiang-de ZHAO Fang and WU Meng-chun |
| Institution: | 1. Zhejiang Institute of Meteorological Sciences, Hangzhou 310017 China 2. Chinese Academy of Meteorological Sciences, Beijing 100081 China 3. Wenzhou Meteorological Bureau, Wenzhou 325001, China |
| Abstract: | With the pros and cons of the traditional optimization and probability pairing methods thoroughly considered, an improved optimal pairing window probability technique is developed using a dynamic relationship between the base reflectivity Z observed by radar and real time precipitation I by rain gauge. Then, the Doppler radar observations of base reflectivity for typhoons Haitang and Matsa in Wenzhou are employed to establish various Z-I relationships, which are subsequently used to estimate hourly precipitation of the two typhoons. Such estimations are calibrated by variational techniques. The results show that there exist significant differences in the Z-I relationships for the typhoons, leading to different typhoon precipitation efficiencies. The typhoon precipitation estimated by applying radar base reflectivity is capable of exhibiting clearly the spiral rain belts and mesoscale cells, and well matches the observed rainfall. Error statistical analyses indicate that the estimated typhoon precipitation is better with variational calibration than the one without. The variational calibration technique is able to maintain the characteristics of the distribution of radar-estimated typhoon precipitation, and to significantly reduce the error of the estimated precipitation in comparison with the observed rainfall. |
| Keywords: | typhoon radar quantitative precipitation estimation variational calibration verification |
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