中国大陆TMPA降水产品气候态的评估

Evaluation of TMPA Precipitation Estimates from 2008 to 2012 over China

利用逐日全国降水分析产品,对2012年12月下旬发布的最新版本的TRMM等多源卫星降水估算产品(TMPA)进行评估,评估时间从2008年9月到2012年8月。从评估结果来看,研究产品3B42V7产品与CPAP产品具有高的相关性,两者的相关系数达到了0.94,相对误差在—0.11%左右,标准偏差约为0.53 mm·d^(-1)。实时产品3B42RT产品与CPAP产品的相关性相对较差,相关系数为0.75,相对误差也上升到了39.3%,标准偏差为1.25 mm·d^(-1)。3B42RT产品在我国西部高估了降水,全年的相对误差为116.60%(春夏秋冬四季分别为104.52%、105.73%、117.64%和326.60%);3B42V7产品的相对误差仅为0.82%(春夏秋冬四季分别为2.25%、1.24%、—5.27%和—24.64%)。

The spatial error structure of surface precipitation derived from the latest version-7 Tropical Rainfall Measuring Mission(TRMM) Multi-satellite Precipitation Analysis(TMPA) algorithms are systematically studied by comparing with the daily China precipitation analysis product(CPAP) from September 2008 to August 2012.The TMPA products include the real-time product 3B42 RT,the research product 3B42(3B42V7).In terms of four-year mean daily precipitation the 3B42V7 products are highly correlated with CPAP with correlation coefficient(CC) being about 0.94,relative bias(RB) about —0.11%and the root mean square error(RMSE) about 0.53 mm · d^(-1).The 3B42 RT product has lower CC about 0.75 and higher relative bias(RB) about 39.30%and RMSE about 1.25 mm · d^(-1).The 3B42 RT product overestimated the rainfall in the west of China with RB about 116.60%for the whole year(104.52%、105.73%、117.64%and 326.60%respectively for spring,summer,autumn and winter).The relative error of 3B42V7 product is only 0.82%(2.25%,1.24%,-5.27%,—24.64%for spring,summer,autumn and winter,respectively).