中文摘要：

利用1998-2008年56个气象台站降水资料,结合TRMM月降水产品,通过对TRMM3B43降水数据在不同气候区、不同时空尺度的精度对比分析,探讨了卫星遥感反演降水产品在中国西北内陆河流域的适应性.结果表明：TRMM探测的月降水数据与实测月降水数据在整体上具有较好的一致性和线性相关性,相关系数为0.76,效率系数为0.58,其探测的降水量比观测值略大;TRMM在高原气候区月降水量的探测效果要优于在西风带区的;TRMM数据所反映的降水量的年内变化过程和实测降水量结果基本一致,但在具体的量上有一定的差异,表现为对降水相对集中的5-9月低估实测降水量,而在降水较少的10月-次年4月高估实测降水量,反映了TRMM对较大强度降水量的探测能力不足.流域多年平均降水量呈现南、北部大,中部小的格局,降水量的高值中心主要出现在高山地区,高达300 mm;而受西风环流影响的塔里木盆地东南面的且末-若羌一带、吐鲁番盆地和受高原区影响的柴达木盆地为极端干旱少雨区,降水量均不足100 mm.

英文摘要：

Based on the precipitation data retrieved from a tropical rainfall measuring mission（TRMM） and 56 meteorological stations from 1998 to 2008,the precisions of TRMM monthly precipitation were analyzed for different spatial-temporal distributions and climate districts to evaluate the availability of remote sensing precipitation estimates over the inland river basins of Northwest China.In general,the TRMM 3B43 estimates agreed well with the gauge data in the whole study area on monthly time scale,with a correlation coefficient of 0.76,efficiency coefficient of 0.58,a slightly negative bias and a better detection in the plateau region than the westerly belt region.The annual variation of precipitation reflected by TRMM was basically the same as that by observed data,but there was some difference in the specific amount of precipitation.TRMM data overestimated observed data in months with a relative concentration of precipitation from May to September, while underestimated observed data in months with less precipitation from October to April the following year, reflecting a lack of detection to precipitation with a greater strength.The satellite precipitation product was also evaluated at yearly time scales.The spatial distribution presented the fact that more precipitation was observed in the southern and northern parts of the basin than in the central parts.The precipitation was mainly concentrated in mountain areas with 300 mm,while in the Tarim Basin and Turpan Basin which was affected by westerly circulation,and Qaidam Basin which was influenced by the plateau region,the precipitation was less than 100 mm.