Along-Scan Bias of Fengyun-3c Microwave Radiation Imager

In this study, along-scan performance of FengYun-3C microwave radiation imager (MWRI) is examined utilizing one-year data over ocean. Generally-good uniformity along azimuth scan position is found with a TB bias less than 1 K at the edge-of-scan. However, discernible errors can be still found and the behaviors of the scan-position-dependent bias are different for ascending and descending phases of the orbits. It is thus suggested that descending and ascending passes should be taken into account, separately, when correcting antenna pattern in calibration processes.