Applicability assessment of ERA-Interim precipitation data in fujian province

• 1、College of Geographcial Science, Fujian Normal University, Fuzhou 350007

Abstract：By using the precipitation data of 25 observation stations in fujian province, the applicability of ERA-Interim reanalysis data in fujian province was analyzed from different time scales.It was found that, in the whole research area, Era-interim could basically reflect the interannual change process of precipitation, which had high reliability. There is a good consistency between the ERA-Interim precipitation data and site observation data on the annual scale, but there are greater fluctuations than the observed data. The correlation coefficient of era-interim data and observation data on the lunar scale was 0.70.with high correlation. In the analysis of seasonal scale precipitation data, the spring precipitation was the most concentrated and the data was less volatile, and the winter data correlation was the highest and the most volatile. The correlation coefficient of the data of the day scale era-interim data and the observation data was 0.65.The reanalysis data of 25 sites was higher than that observation data, which is more volatile. The error between the rainfall date recorded by era-interim and the station is large. According to the mountain direction in the study area, the main source of the error may be topographic factors such as altitude and slope direction. In addition, the data accuracy can be improved by downscaling.

Keywords： Physical geography Reanalysis of data ERA - Interim Precipitation Applicability