A Time Downscaling Scheme of Pr ecipitation by Using Geostationary Meteorological Satellite Data
基于静止气象卫星观测的降水时间降尺度研究

Precipitation estimation with high quality and highresolution in time and space is significant for land model simulation,land data assimilation,and the weather,climate and environment research.To estimate precipitation distribution from rain gauge,the traditional methods interpolate the precipitation in space and time without considering the function of the cloud and discontinuity of precipitation incident in time and space.The paper develops a high-resolution precipitation estimation scheme by using geostationary satellite data,which estimates six-hour resolution precipitation by using multi-channel satellite data and gauge data,and then interpolates the six-hour resolution precipitation into one-hour resolution precipitation by using cloud precipitation probability as weight.The newly developed method is applied to FY2C satellite data and its 6-hour resolution precipitation data to get one-hour resolution precipitation,and is validated again precipitation observation,which shows that the scheme is reasonable.