Retrieval of aerosol optical thickness over land using NOAA/AVHRR data

AVHRR data obtained over land on April 24 and 25, 1997, are analyzed and reported in this paper. At our study site, the aerosol optical thicknesses of visible and near-infrared bands were measured using a sky radiometer. The 0.64 channel data were corrected with our atmospheric correction system and the sky observation data. The surface reflectance at the 3.75 channel was converted from the observed radiance by using the Rojer and Vermote scheme. We found empirical linear relationships of the surface reflectance between the 0.64 and 3.75 channels. By using the linear relationships, the aerosol optical thickness at 0.64 μm could be estimated at the study site.