基于多卫星遥感产品的极端降水监测研究

Study on Extreme Precipitation Monitoring Based on Multi-Satellite Remote Sensing Products

以中国气象局提供的地面观测站点逐小时降水数据为基准数据,综合评估了目前国际上主流的高分辨率多卫星遥感降水在2015年强台风灿鸿所带来的极端降水事件中的表现。结果表明:1所有的卫星遥感降水产品在此次极端降水事件中对实际降水都存在着低估,其中IMERG系列下经过校正的Final产品IMERG-Final-Calibrated表现得最好;2IMERG-Late-Calibrated在实时产品中表现最好,一定程度上可以满足极端降水事件监测对实时性的要求;3总的来说,在此次极端降水事件中,不管是滞时类产品还是实时类产品,IMERG系列卫星降水的表现均要好于TMPA系列下卫星降水的表现。

Based on the hourly precipitation datasets provided by gauge stations of China Meteorological Administration（CMA）, the performance of current mainstream high resolution multi-satellite remote sensing precipitation products is analyzed comprehensively in the extreme heavy rainfall event brought by Can-hom typhoon in 2015. The result show that： 1all the satellite-based precipitation products underestimate the rainfall on this event, and the IMERGFinal-Calibrated performs the best; 2IMERG-Late-Calibrated performs well in real time products, it can meet the requirements of real-time monitoring of extreme precipitation events at some degree; 3overall, in this extreme event, both of the time delay products and real-time products, the performance of IMERG series products is better than TMPA series products.