Shortwave Infrared Multi-Angle Polarization Imager (MAPI) Onboard Fengyun-3 Precipitation Satellite for Enhanced Cloud Characterization

Accurate measurement of the radiative properties clouds and aerosols is great significance to global climate change numerical weather prediction. The multi-angle polarization imager (MAPI) onboard Fengyun-3 precipitation satellite, planned be launched in 2023, will provide multi-angle, multi-shortwave infrared (SWIR) channels multi-polarization satellite observation aerosols. MAPI operates a non-sun-synchronized inclined orbit provides images with spatial resolution 3 km (sub-satellite) swath 700 km. include 1030 nm, 1370 1640 nm corresponding non-polarization channels, which information from 14 angles. In-flight radiometric polarimetric calibration strategies are introduced, aiming achieve accuracy 5% 2%. Simulation experiments show that has some unique advantages characterizing For cloud observation, phase functions around scattering angle cloudbow strong sensitivity droplet radius effective variance. In addition, polarized higher content for aerosol than VIS-NIR. Additionally, geometry non-sun-synchronous orbits can more expanded Thus, new SWIR channel optimize state identification microphysical parameter inversion, as well retrieval results obtained simulations support design next generation imagers China.