In order to improve the operational application ability of the Fengyun-4A(FY-4A)new sounding dataset,in this pa-per,validation of the FY-4A Geosynchronous Interferometric Infrared Sounder(FY-4A/GIIRS)temperature was car-ried out using the balloon sounding temperature from meteorological sounding stations.More than 350,000 samples were obtained through time-space matching,and the results show that the FY-4A/GIIRS temperature mean bias(MB)is 0.07℃,the mean absolute error(MAE)is 1.80℃,the root-mean-square error(RMSE)is 2.546℃,and the correla-tion coefficient(RR)is 0.95.The FY-4A/GIIRS temperature error is relatively larger in the upper and lower tropo-sphere,and relatively smaller in the middle troposphere;that is,the temperature at 500 hPa is better than that at 850 hPa.The temporal variation is smaller in the upper and middle troposphere than in the lower troposphere.The recon-struction of missing data of FY-4A/GIIRS temperature in cloudy areas is also carried out and the results are evaluated.The spatial distribution of reconstructed FY-4A/GIIRS temperature and the fifth generation ECMWF reanalysis(ERA5)data is consistent and completely retains the minimum temperature center with high precision of FY-4A/GIIRS.There are more detailed characteristics of intensity and position at the cold center than that of the reana-lysis data.Therefore,an operational satellite retrieval temperature product with time-space continuity and high accur-acy is formed.The reconstructed FY-4A/GIIRS temperature is used to monitor a strong cold wave event in Novem-ber 2021.The results show that the product effectively monitors the movement and intensity of cold air activities,and it also has good indication for the phase transition of rain and snow triggered by cold wave.

Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites,Innovation Center for Fengyun Meteorological Satellite(FYSIC),National Satellite Meteorological Center,China Meteorological Administration,Beijing 100081;National Meteorological Center,China Meteorological Administration,Beijing 100081

[1]Suling REN;Jianying JIANG;Xiang FANG;Hui LIU;Zhiqiang CAO-.FY-4A/GIIRS Temperature Validation in Winter and Application to Cold Wave Monitoring)[J].气象学报（英文版）,2022(04):658-676

tropo,reana,accur

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