CORRECTION OF THE RAIN RATE ESTIMATES OF GROUND RADAR USING GPM/DPR DATA

Abstract

 To calculate the return period of previous heavy rainfall events and to simulate rainfall data under a future climate, high-accuracy and high-resolution spatial rainfall data are required. While Precipitation Analysis (Radar-AMeDAS) by Japan Meteorological Agency is used in previous studies, X-band Multi-Parameter radar network (XRAIN) is used in this study to take the advantage of its higher-resolution. XRAIN has been pointed out to overestimate rainfall over mountainous area and around radar sites. To correct the overestimation, XRAIN measurements are matched up with Dual-frequency Precipitation Radar (DPR) on the core satellite of the Global Precipitation Measurement (GPM) mission, then correction methods for XRAIN are developed. And the correction result are evaluated by the rain gage data and the ground radar data provided by the Japan Meteorological Agency.