A rapid assessment of MWRI-RM/FY3G brightness temperature  

作　　者：Wenying He Xinran Xia Shengli Wu Peng Zhang Hongbin Chen Xiang'ao Xia Yuquan Zhou Miao Cai 

机构地区：[1]LAGEO,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China [2]School of Hydrology and Water Resources,Nanjing University of Information Science&Technology,Nanjing,China [3]National Satellite Meteorological Centure,Chinese Meteorological Administration,Beijing,China [4]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing,China [5]Key Laboratory of Cloud-Precipitation Physics and Weather Modification,CMA,Beijing,China

出　　处：《Atmospheric and Oceanic Science Letters》2024年第3期42-46,共5页大气和海洋科学快报（英文版）

基　　金：supported by the National Key R&D Program of China[grant number 2022YFF0801301];the National Natural Science Foundation of China[grant number 41575033];the Fengyun Satellite Application Pioneer Project[grant number FY-APP-2022.0111];the Natural Science Foundation of Jiangsu Province[grant number BK20231148]。

摘　　要：2023年4月发射的FY-3G上搭载17个频率的测雨微波成像仪(MWRI-RM),其业务定标的微波亮温(Tb)数据于2023年10月23日公开发布.本文比对了发布10天的MWRI-RM与全球降水测量(GPM)卫星上的微波成像仪(GMI)相匹配的Tb数据,并借助辐射传输模式进行双差分(DD)交叉定标分析,旨在快速评估新一代MWRI-RM观测数据质量.观测比较表明,MWR1-RM与GMI测量的Tb一致性很好,大多通道的平均偏差(MBE)和均方根误差(RMSE)均小于1K.两种传感器由于观测角度略有不同在水面产生约0.5 K差异.DD分析也展示出MWRI-RM的大多数通道性能与GMI相当接近,尤其是首次启用的高频166 GHz和183 GHz.The Microwave Radiation Imager for the Rainfall Mission(MWRI-RM)onboard the FengYun 3G satellite(FY3G),launched in April 2023,will provide massive brightness temperature(Tb)measurements at 17 frequencies from10.65 GHz to 183 GHz.The operationally calibrated MWRI-RM Level 1B Tb data have been released since 23October 2023.The MWRI-RM measurements are compared with the simultaneous measurements from the GPM Microwave Imager(GMI)to provide a first overview of the MWRI-RM measurement quality.A radiative transfer model(RTM)is performed for the double difference(DD)analysis.The results show that the Tbs of MWRI-RM are in good agreement with those of GMI,with mean bias error(MBE)and root-mean-square error(RMSE)values of less than 1 K for most channels.Larger differences are observed at the horizontal polarization of 36.5 and 89 GHz,with an RMSE of about 2 K.RTM simulations reflect that the Tb difference between MWRI-RM and GMI due to the different Earth incidence angle of the sensors is about 0.5 K over the sea.The DD analysis results suggest that MWRI-RM demonstrates quite similar performance to GMI for most channels,especially for the first used channels at 166 GHz and 183 GHz.

关 键 词：FY3G MWRI-RM GMI 亮度温度 双差分方法 

分 类 号：P407[天文地球—大气科学及气象学]