CONSIDERATION ON NONSTATIONARITY AND EXTREME VALUE OF PRECIPITATION BY USING AMeDAS AND d4PDF DATA

Abstract

 We have some sense that frequency of high-intensity precipitation has recently increased. We confirmed that this sense by using observation data (AMeDAS data) and d4PDF(database for Policy Decision making for Future climate change) data. Furthermore, we estimated spatial average of annual precipitation of Japanese terrestorial area. It is approximately 1,900mm and it has increased during recent 60 years. Finally, we compared 100 year-precipitation calculated by using population (whole data of d4PDF) and thoese calculated by each member of d4PDF. As a conclusion, 100y-precipitation calculated by using one member potentially has large bias.