The estimation of aerosol optical parameters from ADEOS/POLDER data

A cross calibration analysis between POLDER and OCTS sensors on board ADEOS satellite in terms of the space reflectance was made. Space reflectance va lues, computed from the POLDER and OCTS data (acquired simultaneously on 26 April 1997) for the same ocean target, were examined and we found that the y are in good agreement in all bands, when the new in-flight calibration ga in factors for each sensor are assumed. Furthermore, we retrieved aerosol o ptical parameters (i.e., the optical thickness, Angstrom exponent, and refr active index) by using several retrieving algorithms from using ADEOS/POLDE R's directional space reflectance and polarization data in infrared bands s imultaneously. Retrieved results were presented by the form of distribution maps. In addition, good and bad points of each retrieval algorithm were di scussed. Finally, we proposed an improved method for retrieving aerosol opt ical parameters, which utilizes theoretical P-SR (polarization-space reflec tance) diagrams at given viewing angles in an 865 nm band. The estimated ae rosol optical parameters by our proposed method were compared with the simu ltaneously measured sky observation data. We found an excellent agreement b etween them. (C) 2000 Elsevier Science Inc. All rights reserved.