CMORPH和TRMM 3B42降水估计产品的评估检验

Evaluation and Verification of CMORPH and TRMM 3B42Precipitation Estimation Products

文章利用2007-2010年中国2447个站点的逐小时降水观测数据对同期CMORPH和TRMM 3B42卫星降水估计产品进行了检验和评估。经过对比分析得出:CMORPH和TRMM 3B42卫星降水资料与地面台站资料的日平均降水量空间分布具有较好的相似性,3 h降水量的相关系数在大部分地区分别在0.5和0.4以上;偏差均在±0.25 mm之间,但CMORPH存在显著的南北差异;平均绝对误差、相对误差和均方根误差均存在明显的季节周期性变化;两种卫星资料能够较好反映我国大部分区域夏季降水日变化特征,但在部分地区存在大的偏差;CMORPH和TRMM 3B42总空演率分别为7.23%和2.63%,总漏演率分别为3.25%和5.50%。

The hourly precipitation observation data from 2447 rain gauge records are used to verify and evaluate the satellite precipitation estimation products of Climate Prediction Center Morphing Technique (CMORPH)and Tropical Rainfall Measuring Mission (TRMM)3B42 during 2007-2010 in China.The results show that the two satellite precipitation data are similar to ground gain gauge data in revealing the spatial patterns of daily mean precipitation amount.The pattern correlation coefficients of 3 h rainfall amount are over 0.5 and 0.4 in most areas,respectively.Bias of two satellite precipitation products are both between the positive and negative 0.25 mm,but there are significant difference between the north and the south.And the mean absolute error,relative error and root-mean-square error all have a significant seasonal periodic variations.The two satellite precipitation products can reflect the summer rainfall diurnal variation well in most parts of China,but there are also clear distinctions in some areas.The overall vacan-cy retrieval rate of CMORPH and TRMM 3B42 products are 7.23% and 2.63%,overall missing retrieval rate are 3.25% and 5.5%,respectively.