Comprehensive applicability evaluation of four precipitation products at multiple spatiotemporal scales in Northwest China  

作　　者：WANG Xiangyu XU Min KANG Shichang LI Xuemei HAN Haidong LI Xingdong 

机构地区：[1]School of Mathematics,Lanzhou Jiaotong University,Lanzhou 730070,China [2]Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730070,China

出　　处：《Journal of Arid Land》2024年第9期1232-1254,共23页干旱区科学（英文版）

基　　金：supported by the National Key Research and Development Program of China(2023YFC3206300);the National Natural Science Foundation of China(42477529,42371145,42261026);the China-Pakistan Joint Program of the Chinese Academy of Sciences(046GJHZ2023069MI);the Gansu Provincial Science and Technology Program(22ZD6FA005);the National Cryosphere Desert Data Center(E01Z790201).

摘　　要：Precipitation plays a crucial role in the water cycle of Northwest China.Obtaining accurate precipitation data is crucial for regional water resource management,hydrological forecasting,flood control and drought relief.Currently,the applicability of multi-source precipitation products for long time series in Northwest China has not been thoroughly evaluated.In this study,precipitation data from 183 meteorological stations in Northwest China from 1979 to 2020 were selected to assess the regional applicability of four precipitation products(the fifth generation of European Centre for Medium-Range Weather Forecasts(ECMWF)atmospheric reanalysis of the global climate(ERA5),Global Precipitation Climatology Centre(GPCC),Climatic Research Unit gridded Time Series Version 4.07(CRU TS v4.07,hereafter CRU),and Tropical Rainfall Measuring Mission(TRMM))based on the following statistical indicators:correlation coefficient,root mean square error(RMSE),relative bias(RB),mean absolute error(MAE),probability of detection(POD),false alarm ratio(FAR),and equitable threat score(ETS).The results showed that precipitation in Northwest China was generally high in the east and low in the west,and exhibited an increasing trend from 1979 to 2020.Compared with the station observations,ERA5 showed a larger spatial distribution difference than the other products.The overall overestimation of multi-year average precipitation was approximately 200.00 mm and the degree of overestimation increased with increasing precipitation intensity.The multi-year average precipitation of GPCC and CRU was relatively close to that of station observations.The trend of annual precipitation of TRMM was overestimated in high-altitude regions and the eastern part of Lanzhou with more precipitation.At the monthly scale,GPCC performed well but underestimated precipitation in the Tarim Basin(RB=-4.11%),while ERA5 and TRMM exhibited poor accuracy in high-altitude regions.ERA5 had a large bias(RB≥120.00%)in winter months and a strong dispersion(RMSE≥35.00 mm)in sum

关 键 词：precipitation products the fifth generation of European Centre for Medium-Range Weather Forecasts(ECMWF)atmospheric reanalysis of the global climate(ERA5) Global Precipitation Climatology Centre(GPCC) Climatic Research Unit gridded Time Series(CRU TS) Tropical Rainfall Measuring Mission(TRMM) applicability evaluation Northwest China 

分 类 号：P339[天文地球—水文科学] P426.6[水利工程—水文学及水资源]