Development of GOSAT Air Pollution Watch (GAPW)

Abstract

We developed a prototype system to generate PM2.5 concentration maps using GOSAT/CAI L1B products. The AOT (Aerosol Optical Thickness) retrieving process at 380 nm was reimplemented. We developed a formula to calculate PM2.5 concentrations by comparing satellite images and ground measurement data. Estimated PM2.5 concentrations showed good correlation with ground data (r=0.713 RMSE=22.4 μg/m³). Finally, PM2.5 concentrations maps were generated. In addition, an empirical cloud-screening method using CAI band1 images (SCUV) was also developed.