The code of Regional multi-Air Pollutant Assimilation System (RAPAS v1.0) for emission estimates

RAPAS is a Regional multi-Air Pollutant Assimilation System, which can quantitatively optimize gridded source emissions of CO, SO2, NOx, primary PM2.5 and coarse PM10 on regional scale via simultaneously assimilating surface measurements of CO, SO2, NO2, PM2.5 and PM10. These codes correspond to the paper entitled "A Regional multi-Air Pollutant Assimilation System (RAPAS v1.0) for emission estimates: system development and application". 3DVar directory contains original GSI DA codes and extended codes by the author used to optimize CMAQ initial conditions. EnKF directory contains DA codes originally created by the author used to optimize emissions.