Intercomparison of parametric bias correction methods for daily precipitation of RCMs

Abstract

In this report, we compare several parametric bias correction methods for extreme daily precipitation of RCMs. Using daily precipitation data of RCM20, 100-year precipitation for present and future climate around Ibaraki Prefecture is calculated. The bias correction methods used in this report are based on parametric representation of rainfall frequency distribution, in which RCM precipitation is corrected according to exceedance probability of observed and RCM precipitation. Comparison of four methods with different distribution functions shows that, while the corrected 100-year precipitations differ themselves, the difference of change ratios of present and future climate are relatively small.