西藏高原测站降水与TRMM估测降水一致性评估

利用124个测站2011—2012年6—8月逐小时降水资料，分辨率为0.25°×0.25°的TRMM估测降水和DEM 高程数据，采用相关系数、相对误差和准确性指标，分析了西藏高原TRMM估测降水整体表现能力及海拔高度对降水估测影响。结果表明：TRMM估测降水在西藏高原整体趋势较一致，降水量级偏大，次数偏多；平均无降水准确率远高于平均有降水准确率，漏测率低而空测率高，降水量大的测站TRMM估测能力相对强。西藏高原上大部分测站处于相对低洼（河谷）地带，海拔高度差较小的区域TRMM估测降水与测站降水误差小，较大的区域误差则大。

Consistency Evaluation for Observation and TRMM Precipitation Estimation in Tibetan Plateau

Using hourly precipitation observation data from 124 stations during the period from June to August, 2011-2012, TRMM estimated precipitation data with 0.25°×0.25° resolution, DEM elevation data, the correlation coefficient, relative error and accuracy index, the TRMM precipitation estimate ability in Tibetan and the elevation effect on precipitation estimation are analyzed. The results show that TRMM precipitation estimation trend in the plateau is consistent with larger precipitation intensity and more frequency. The average accuracy without precipitation is much higher than mean accuracy rate of precipitation, the missing rate is lower and false alarm is higher. The TRMM data have better estimate ability on the observation station with more rains. The observing sites of Tibetan are mostly located in relatively low lying area (valley). When the elevation error between observating stations and surrounding areas is small, the precipitation error between TRMM and observation is small. On the contrary, precipitation error becomes larger when the elevation error is larger.