Comparison of aerosol parameter retrieval results from the analysis of ADEOS/POLDER and ADEOS/OCTS data Original Research Article

In this study we presented a new multi-directional R-P(Reflectance-Polarization) algorithm which retrieves aerosolʹs three optical parameters, namely, the real part of refractive index, optical thickness and Ångström exponent, by using ADEOS/ POLDERʹs single near-infrared band data. We validated our retrieved results, by comparing with the simultaneously measured sky observation data at the target site. We found a good agreement between them. Furthermore, the retrieval results by the proposed algorithm were compared with those by a multi-directional R-R(Reflectance-Reflectance) algorithm using the reflectance data of POLDER in a single infrared band and by a mono-directional R-R algorithm using the reflectance data of ADEOS/OCTS in two infrared bands. Although we had a good agreement in the aerosol optical thickness among these algorithms, we found that the retrieval results of Ångström exponent are not reliable in the cases of the latter two algorithms using the reflectance data alone.