基于TRMM和CMORPH的降雨数据对比分析研究

Comparative Analysis of TRMM and CMORPH Rinfall Data

以四川地区42个地面气象站点的降雨数据为基础,对TRMM和CMORPH降雨数据所反映的降雨特征进行对比分析。通过不同分布图对比分析两种卫星数据反映区域降雨的能力。可看出两种卫星数据所反映出的降雨特点与站点数据反映的特点有较高的相似性,都能反映较为一致的降雨细节特征,但仍然存在差异。其中CMORPH数据的平均相关系数和拟合优度值比TRMM数据稍高,具有更好的表现能力。

Using the rainfall data of 42 ground meteorological stations in Sichuan as a benchmark,the rainfall characteristics reflected by TRMM and CMORPH were compared and analyzed.The ability of these two kinds of satellite data to reflect regional rainfall was explored through distribution maps.It was found that both of the two kinds of satellite data could capture detailed rainfall properties,which are significantly consistent to those reflected by site data,while there are still some differences.More detailedly,CMORPH performed better than TRMM as it had higher values of mean correlation coefficient and goodness of fit between satellite data and site data than TRMM.