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FY3E is the world&#x0027;s first dust-dawn orbiting meteorological satellite for civil use, which has filled the vacancy of global early-morning-orbit satellite observation by working together with FY3C and FY3D satellites. The Medium Resolution Spectral Imager - Low Light sensor (MERSI-LL) carried by FY3E can detect surface temperature variation. The radiometric calibration conditions of MERSI-LL thermal infrared bands were evaluated using the collected field measurements and atmospheric transfer simulations during December 5-23, 2022 at Lake Erhai. A thermal infrared radiometer equipped on an unmanned surface vehicle (USV) was used to continuously collect surface-emitted radiance and water temperature. Atmospheric conditions, surface emissivity, and aerosol optical depth measured near field experiment site were adopted by atmospheric radiative transfer code to calculate the influence of atmosphere on long-wave radiation during the propagation from land surface to satellite aperture. The good in-orbit operational status could be detected according to our calibration experiments, and the calibration analysis suggested that the differences between the simulated brightness temperature and satellite-based brightness temperature are 0.71K with a RMSE of 0.79K and 0.11K with a RMSE of 0.47K for channel 6 and channel 7, respectively, which achieved better or similar calibration accuracy by comparing with TIR channels of other FengYun satellites.

Radiometric calibration analysis for thermal infrared data from MERSI-LL onboard the dust-dawn orbiting satellite FY3E