双线偏振多普勒雷达估算降水方法的比较研究

用美国KOUN双线偏振多普勒雷达2003年5～6月观测的两次强对流降水的天气过程资料，研究了从冰雹云降水回波中剔除冰雹回波得到液态降水区域的方法，冰雹回波剔除的结果保证了估测降水量不受冰雹的影响；分析了S波段双线偏振多普勒雷达几种估测降水强度方法的差异，并与地面雨量站资料进行对比，研究了KDP计算方法本身对降水估测的影响。结果表明：在实际的估测降水中，不同降水估测方法得到的结果有较大的差异，利用KDP估测降水的方法不适合小雨阶段的测量。

A Comparison of Methods of Rainfall Rate Measurements by Dual Linear Polarization Doppler Radar

Based on the data observed by KOUN radar of USA on the two convective rainfall events on May 10th and June 12th in 2003, a method of estimating liquid precipitation is developed by eliminating the hail echo from hybridtype precipitation echo. This method ensures hail has no influence on estimating rainfall rate. By analysis of the differences of the four methods on estimating rain intensity at S band of dual linear polarization Doppler radar, the influence of KDP numerical method on the estimating rainfall is al~ studied here. The conclusion is that there is great difference in the four estimation methods and the K~ method is not fit to estimate precipitation when the rain intensity is weak.