TRMM、CMORPH、PERSIANN三組衛星資料對臺灣降雨日變化特色的表現能力評估

This study evaluates the performance of TRMM, CMORPH, and PERSIANN precipitation productions in representing the characteristics of diurnal precipitation (including daily mean and diurnal variation) in Taiwan during four different seasons: spring (March to May), summer (June to August), autumn (September to November) and winter (December to next February). Results show that TRMM is the best among the three for depicting both the spatial-temporal characteristics of the daily mean and the diurnal variation of precipitation in Taiwan during the seasons of spring, summer and autumn. While for the winter season, none of the three satellite products can capture the observed regional difference in the timing of occurrence of maximum diurnal precipitation. Possible causes for the differences among TRMM, CMORPH and PERSIANN in depicting the characteristics of diurnal variation of precipitation in Taiwan during the seasons of spring, summer and autumn are also discussed. Analyses also show that the three satellites have larger differences in depicting the diurnal variation of precipitation in Taiwan, compared to the differences in depicting the diurnal variation of precipitation over the nearby ocean.