A Method of Rainfall Estimation in Sichuan Using FY-2C Geostationary Satellite Data
A statistical analysis of satellite rainfall estimation is performed using 3854 pairs of FY2C infrared cloudtop temperatures and rai nfalls from automatic meteorological observation station on 0607 June 2006 from 0000 to 0600 (Beijing Time). It is found that one hour accumulated rainfall amoun t can be estimated for Sichuan in real time based on the lowest infrared cloud top brightness temperature and the change of IR cloudtop temperature in one hou r. Using this method, a standard database for satellite rainfall estimation is es tablished. The 1h rainfall rates on 27 August 2007 from 1300 to 1900 and on 28 August 2007 from 0400 to 1600 (Beijing Time) are achieved in Sichuan based on the database. The RMSE of rainfall estimations at each IR temperature level is less than 2.0mm. The higher the lowest inf rared cloudtop temperature, the less the RMSE of the estimated rainfall rate. Th e method is feasible for the rainfall estimation of Sichuan.