FY-3 Satellite Infrared High Spectral Sounding Technique and Potential Application

High spectral infrared sounders possess distinct advantages in application of atmospheric temperature and humidity profiles retrieval, numerical weather prediction(NWP), climate change study and trace gas measurement due to high spectral resolution, low radiometric noise and high spectral and radiometric accuracy.Infrared Atmospheric Sounder(IRAS)was successfully launched onboard FY-3A/B/C satellites.It measures 26 channels of radiance from visible to infrared spectral range and was used in data assimilation, global atmospheric temperature and humidity profile retrieval, et al.A high spectral infrared atmospheric sounder(HIRAS)designed and manufactured completely by China will be carried onboard FY-3D, marking a new epoch of infrared high spectral vertical sounding system in China.FY-3D/HIRAS was taken as an example, and satellite infrared high spectral sounding technique and key preprocessing issues of high spectral infrared sounders were summarized as well as analysis and discussion of difficult problems that exist in high spectral infrared data application of NWP and climate study.