TRMM PR雷达与阜阳雷达降水资料的对比研究

选取了1998年与1999年HUBEX观测资料，将TRMM卫星上的星载降雨雷达PR与阜阳的713数字化天气雷达资料在以下3个方面做了比较：(1)强度场的分布；(2)平均反射率廓线；(3)灵敏度。分析、比较结果可知阜阳雷达在探测灵敏度和水平方向的分辨率要高于PR，但由于波束宽度、衰减和资料转化过程计算误差的原因，其远距离处的观测值与真实值有一定偏差。PR波长短，对衰减敏感，尤其是在垂直方向上经过强衰减后，订正值仍偏小。但由于探测方式的不同PR在水平方向上不存在衰减的问题，且其资料分布均匀，因此提出一种用PR资料来订正地基雷达资料的方法用以提高地基雷达探测的精确度。

A Comparative Study of Data from TRMM Precipitation Radar and Fuyang Radar

The precipitation radar (PR), the first space-borne rain radar, carried by Tropical Rainfall Measuring Mission (TRMM)satellite, has provided a new sounding method for atmospheric research and has played an important role in understanding the circulation of global energy and water for five years. In this paper, the data of Fuyang ground-based radar and PR data, both obtained from Huihe River Basin Experiment (HUBEX)in 1998 and 1999, have been compared in three aspects, 1) Distribution of echo intensity, 2) Averaged reflectivity profiles, 3) Sensitivity Analyses indicate that Fuyang radar is better than PR in sensitivity and horizontal resolution, but the observing error still exists in data because of attenuation-influence and beam-width influence. The farther the observed region is away from Fuyang radar station, the more difference between the observed value and true value is. The wavelength of PR is shorter than the Fuyang's therefore the PR is more sensitive to the attenuation in strong echo. Especially when the strong attenuation is encountered, the corrected echo value of PR is still smaller than the true value. The way of PR detecting precipitation clouds, from space to surface, is thoroughly different from Fuyang ground-based radar's. The PR data can easily avoid the attenuation-influence in horizontal direction. The vertical resolution of PR data is much better than the Fuyang's and the PR data is symmetrically distributed in spatial domain which is dislike Fuyang radar data, so a new effective method for correcting echo value of Fuyang ground-based radar is provided in this paper by comparing the averaged profiles of PR and Fuyang in different regions.