Evaluation of Eight High-Resolution Gridded Precipitation Products in the Heihe River Basin, Northwest China

The acquisition of the precise spatial distribution precipitation is great importance and necessity in many fields, such as hydrology, meteorology ecological environments. However, arid semiarid regions Northwest China, especially over mountainous areas Heihe River basin (HRB), scarcity uneven rainfall stations have created certain challenges gathering information that accurately describes for use applications. In this study, accuracy estimates from eight high-resolution gridded products (CMORPHv1-CRT, CRU TSv.4.05, ERA5, GSMaP_NRT, IMERG V06B-Final, MSWEPv2.0, PERSIANN-CDR TRMM 3B42v7) are comprehensively evaluated by referring to observations 23 HRB using six indices (root mean square error, standard deviation, Pearson correlation coefficient, relative error Kling–Gupta efficiency) different temporal scales. results show at an annual scale, MSWEP has highest entire basin, while PERSIANN, ERA5 most accurate upper, middle lower reaches HRB, respectively. At a seasonal performance IMERG, superior other all seasons reaches, Over PERSIANN displays smallest deviation except spring. shows spring autumn, summer winter, monthly products, with relatively stronger almost every month, GSMaP inferior products. Moreover, perform best, favorable statistical around station, worse performance. addition, tends overestimate higher values, values basin. overestimation appear upper reach area, area. Only yield underestimations precipitation, strongest tendency appearing study display some findings on uncertainties several frequently used datasets high mountains poorly gauged will be helpful researchers various fields who need well data producers want improve their