多源降水产品在不同气候带的水文模拟评估

以NOAA-CPC-US降水产品作为参照,选取美国不同气候带的8个流域,通过对比分析,评估了卫星降水PERSIANN和GPM-IMERG、雷达降水StageIV以及第5代ECMWF大气再分析全球气候数据ERA5等降水产品的精度,继而以5种降水数据驱动分布式水文模型(CREST),评估了它们在径流模拟中的效用.结果表明:雷达降水StageIV在8个不同气候带中的降水估算精度最好,其次是卫星降水GPM-IMERG和PERSIANN,气候模式降水ERA5.在径流模拟中,Stage IV和NOAA-CPC-US在不同气候带的流域都表现较好,能够满足不同气候带流域水文模拟需求.降水GPM-IMERG和PERSIANN的径流模拟能力在不同气候带并不一致,稳定性不高,地处低纬度的气候带好于高纬度气候带;且总体上降水GPM-IMERG优于PERSIANN,这2种降水产品在水文模拟使用时还需进一步验证;ERA5的水文模拟效果不理想,尚不能支撑不同气候带小流域的水文模拟.

Hydrological simulation and evaluation of multi-source precipitation products in different climatic zones

Using NOAA-CPC-US precipitation products as a reference, eight watersheds in different climatic zones in the United States were selected. Through comparative analysis, the accuracy of satellite precipitation PERSIANN and GPM-IMERG, radar precipitation StageIV, and the fifth-generation ECMWF atmospheric reanalysis global climate data ERA5 were evaluated. Then, five types of precipitation data driven distributed hydrological models(CREST)were used to evaluate their utility in runoff simulation. The results show that radar precipitation StageIV has the best precipitation estimation accuracy in eight different climatic zones, followed by GPM-IMERG and PERSIANN satellite precipitation and ERA5 climate model precipitation. In runoff simulation, Stage IV and NOAA-CPC-US perform well in watersheds in different climatic zones, which can meet the hydrological simulation needs of watersheds in different climatic zones. The rainfall-runoff simulation capabilities of precipitation GPM-IMERG and PERSIANN is not consistent in different climate zones, and the stability is not high. The climate zone located in low latitudes is better than that in high latitudes.In general, the precipitation GPM-IMERG is better than PERSIANN and these two precipitation products need to be further verified when used in hydrological simulation. The hydrological simulation effect of ERA5 precipitation is not atisfactory and cannot support the hydrological simulation of small watersheds in diffe-rent climatic zones.