水科学进展2018，Vol.29Issue(2)：169-178,10.DOI:10.14042/j.cnki.32.1309.2018.02.003
基于分段三伽玛分布的降雨偏差纠正方法
A separated three-gamma bias correction method for precipitation
摘要
Abstract
To solve the problem that there exists large bias between simulated precipitation from global climate models (GCMs) and measured precipitation,a bias correction method based on separated three gamma distributions (STG)was proposed.This method divides the precipitation sequence into three parts,i.e.,the minimum values,the normal values and the maximum values,and then the cumulative distribution functions (CDFs) of these three parts are respectively bias corrected.In addition,based on the thought of quantile deviation accumulation,a comprehensive evaluation index C is also put forward to evaluate the bias correction effects of STG method.The STG method is applied to correct the bias between the simulated precipitation from 18 GCMs and measured precipitation for 17 meteorological stations in Yarlung Tsangpo River basin,and is further compared with the existing two gamma-related bias correction methods,i.e.,Single Gamma (SG) and Double Gamma (DG).The results show that the STG method can effectively remove the bias between GCMs simulated precipitation and observed precipitation,and the evaluation indexes C are mostly above 0.85.Moreover,STG performes better than SG and DG in the validation period which indicates STG is more robust for bias correcting GCMs simulated precipitation.关键词
降雨/偏差纠正/分段三伽玛/全球气候模式/雅鲁藏布江Key words
precipitation/bias correction/separated three-gamma/global climate models/Yarlung Tsangpo River分类
建筑与水利引用本文复制引用
高超,文化,宣伟栋,刘莉,许月萍..基于分段三伽玛分布的降雨偏差纠正方法[J].水科学进展,2018,29(2):169-178,10.基金项目
国家自然科学基金资助项目(91547106) （91547106）
国家重点研发计划政府间国际科技创新合作重点专项(2016YFE0122100)The study is financially supported by the National Natural Science Foundation of China (No.91547106) and the National Key R&D Program of China (No.2016YFE0122100). （2016YFE0122100）
