Intercalibration of FY-3C MWRI Brightness Temperature Against GMI Measurements Based on Ocean Microwave Radiative Transfer Model

This paper presents a method to intercalibrate the brightness temperature (TB) acquired by the Microwave Radiation Imager (MWRI) on Chinese meteorological satellite Fengyun 3C (FY-3C) against the measurements obtained by the Global Precipitation Measurement (GPM) Microwave Imager (GMI) based on an ocean microwave radiative transfer model, and the intercalibration coefficients of FY-3C MWRI are obtained. The results show that the MWRI measurements are underestimated, especially the TB in the low frequency bands, and the calibration bias decreases with the frequency increment. In addition, the calibration of FY-3C MWRI ascending data is much better than that of FY-3C MWRI descending data.