摘要
卫星准确的降水数据对实时的降水监测和天气预报非常重要,本文以中国大陆及其周边海域为研究区域,以 DPR(Dual-frequency Precipitation Radar)降水产品为参考值,采用分类统计指标以及精度评价指标对 2022 年 7 月～9 月的 AMSR2(Advanced Microwave Scanning Radiometer 2)降水产品进行检验评估.结果表明,AMSR2降水产品在海洋上的观测效果最好,观测降水命中率为0.659,ETS评分为0.546,且与DPR的相关系数为0.679,RMSE为4.598 mm/h;在陆地上的观测效果次之,观测降水空报率较大,等于0.277,ETS评分为0.357,且与DPR的相关系数为0.325,RMSE为2.793 mm/h;而在海岸上的观测效果相对较差,观测降水命中率较低,等于0.361,ETS评分为0.307,且与DPR的相关系数为0.329,RMSE为4.527 mm/h.同时随着雨量等级的增大,AMSR2降水产品对降水量的估计误差也越来越大,且在小雨等级,容易高估降水量,在中雨等级,在海岸容易低估降水量,而在海洋和陆地容易高估降水量,在大雨和暴雨等级,容易低估降水量,且低估程度随雨量等级的增大而增大.
Abstract
Accurate precipitation data of satellite is very important for real-time precipitation monitoring and weather forecasting.This paper takes the Chinese mainland and its surrounding sea areas as the research area,and takes the DPR(Dual-frequency Precipitation Radar)precipitation data as the reference value to verify and evaluate the AMSR2(Advanced Microwave Scanning Radiometer 2)precipitation product from July to September 2022 by using classification statistical indicators and accuracy evaluation indicators.The results show that the AMSR2 precipitation product has the best observation effect over the ocean,with the probability of detection of 0.659 and ETS score of 0.546,and the correlation coefficient with DPR is 0.679,RMSE is 4.598 mm/h;The observation effect over the land is second,with the false alarm ratio of 0.277 and ETS score of 0.357,and the correlation coefficient with DPR is 0.325,RMSE is 2.793 mm/h;The observation effect over the coast is relatively poor,with the low probability of detection of 0.361 and ETS score of 0.307,and the correlation coefficient with DPR is 0.329,RMSE is 4.527 mm/h.At the same time,as the rainfall level increases,the estimation error of AMSR2 precipitation product for precipitation is also increasing.It is easy to overestimate precipitation in light rainfall level,and in moderate rainfall level it is easy to underestimate precipitation over the coast,to overestimate precipitation over the sea and land,while in heavy rainfall and heavy rainstorm level it is easy to underestimate precipitation,and the degree of underestimation increases with the increase of rainfall level.
维普
万方数据