利用青藏高原色林错流域2014年4月到2015年3月期间5个地面观测站点的降水资料,对两种遥感降水——热带降水测量计划降水产品(Tropical Rainfall Measuring Mission, TRMM)和全球降水测量(Global Precipitation Measurement, GPM)——观测产品在高海拔、寒冷条件的适用性进行了评价。通过相关性评价指标、误差统计评价指标和分类统计评价指标等对比,发现:① 无论在日和年尺度上,相较于TRMM卫星降水产品而言,GPM卫星降水产品的精确度更高;TRMM产品明显过高估测了降水量;② 两种产品对强降水事件的探测性能都有较大缺陷,GPM产品对弱降水事件的探测能力明显优于TRMM产品;③ 随着统计时间尺度的增大,GPM降水产品的精度呈明显增加趋势。
In this paper, the uncertainties of satellite precipitation products, both of Global Precipitation Measurement (GPM) and widely used precipitation product—Tropical Rainfall Measuring Mission (TRMM), were evaluated based on the data from five meteorological stations in the Silin Co Basin in the Tibetan Plateau during the period from April 2014 to March 2015. The accuracies of GPM and TRMM were studied using the correlation evaluation index (Person Correlation Coefficient R), Error statistical evaluation index (including the root mean square error RMSE and percent bias PB) and classification statistical evaluation index (BIAS, POD, FAR and HKS score). The results showed that: ① The accuracy of GPM was higher than that of TRMM at both daily and annual timescales, and the precipitation was significantly overestimated if the TRMM products were used; ② Although GPM performed better than TRMM in detecting weak precipitation events, there were some big flaws of both products in detecting the heavy precipitation events; ③ The accuracy of GPM was obviously increased with the increase of timescale.
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