人民长江2024，Vol.55Issue(4)：103-117,15.DOI:10.16232/j.cnki.1001-4179.2024.04.015
中国典型降水产品精度多时间尺度变化及空间分布
Precision variation of typical precipitation products at multi-time scale and their spatial distributions in China
摘要
Abstract
To evaluate the accuracy of 3 typical precipitation products,including MSWEP V2.8,TRMM 3B42 V7,and China Meteorological Forcing Dataset(CMFD),with long time series and high temporal resolution in China's mainland,we analyzed them from the perspectives of multi-scale,evolution function and spatial heterogeneities.Based on the hourly data of 2117 mete-orological stations in recent 5 a,the 4 indexes of correlation coefficient(Corr),root mean square error(RMSE),median of relative error(REM),and probability of detection(POD)were selected to systematically evaluate their accuracy and spatial distribution characteristics at the hourly,daily,ten-day and monthly scales,and the evolution function models were established to describe the trends of these indices accompanied with the increase of temporal scale.The results reveals that the accuracies of the 3 precip-itation products,generally,increase from the northwest to the southeast regions,and MSWEP exhibits a higher accuracy than CM-FD and TRMM in POD and REM at all scales while they show inconsistency in Corr and RMSE at sub-daily and ten-day/monthly scales.As for the evolution function models,RMSE and REM can be described by a power function,and Corr and POD from hourly to monthly scale follow a modified logarithmic Gamma distribution function well.The research results can provide ref-erences for optimal identification,accuracy improvement,and deep fusion of precipitation production.关键词
降水产品/精度评价/尺度演变/空间分布/函数模型Key words
precipitation products/accuracy evaluation/multiscale evolution/spatial distribution/function model分类
天文与地球科学引用本文复制引用
赵珊珊,周向阳,童锦施..中国典型降水产品精度多时间尺度变化及空间分布[J].人民长江,2024,55(4):103-117,15.基金项目
国家自然科学基金项目(51969006,42167037) （51969006,42167037）
贵州省科技项目(黔科合支撑[2019]2875号) （黔科合支撑[2019]2875号）
贵州省水利科技项目(KT201707) （KT201707）
