Improved Clear Sky Model from In Situ Observations and Spatial Distribution of Aerosol Optical Depth for Satellite-Derived Solar Irradiance over the Korean Peninsula

In solar resource assessment, the climatological environment of target area is objectively quantified by cloudiness or clear sky index, which defined as ratio global horizontal irradiance to insolation. The model calculates incoming on ground surface considering several atmospheric parameters such water vapor and aerosol optical depth. This study investigated importance depth for deriving in radiative transfer models examined its viability a universal community public use. evaluation was conducted based observations at Korea Institute Energy Research (KIER) station from January December 2021. original simulation performed using monthly mean obtained Aerosol Robotic Network station; absolute error 29.9 W m−2. When daily situ KIER incorporated into model, reduced 9.7 Our results confirm that gridded datasets suitable use model.