GPM双频测雨雷达与C波段雷达资料对比研究

Comparative Study Between GPM Dual-frequency Precipitation Radar and C-band Radar

对全球降水测量卫星(GPM)双频测雨雷达(DPR)和C波段双线偏振多普勒天气雷达反射率因子数据进行分类型降水对比研究,以更好地了解二者的差异性和相似性。采用几何匹配法将二者的观测数据进行时空匹配,选取典型个例进行层状云和对流性分类型降水对比研究,并对2016年15对匹配数据进行统计对比分析。通过研究发现,C波段双偏振多普勒雷达与GPM星载双频雷达的相关性很好,总体相关系数达0.81,降水回波基本一致,探测差异较小,其中层状云降水相对对流性降水,两部雷达相关性更好。

In order to better understand the differences and similarities between dual-frequency precipitation radar(DPR)on global precipitation measurement(GPM)and C-band dual-polarization Doppler weather radar(CDP),a comparative study is implemented using their reflectivity factor data.First,observation data in time and space of two radar is matched by geometric matching method.Then,a typical case is selected for comparative study of stratiform and convective precipitation.Meanwhile,a statistical comparative analysis of 15 pairs of matched up data in 2016 is studied.Through this study,the CDP is found to have a good correlation with DPR,with coefficient of correlation up to 0.81,and their precipitation echoes are basically consistent.Compared with convective precipitation,radar relevance of stratiform precipitation is better.