Effects of water vapor and anisotropic scattering on aerosol optical depth retrieval.
Clifford, Mary B.
Durkee, Philip A.
Pauley, Patricia M.
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NOAA-7 AVHRR data from April 1982 was used to perform global-scale analysis of aerosol particle characteristics. Mahony's (1991) water vapor correction was incorporated into the AVHRR multichannel satellite data processing technique used by Frost (1988). Channel 4/Channel 5 brightness temperature difference was used as an estimate of water vapor content in an air column. Greatest measured water vapor content was at the equator, decreasing toward the poles. Applying the correction reduced the aerosol particle size index, resulting in an increase in aerosol optical depths. In addition, the high particle size index over the low latitudes in the southern hemisphere noted by Frost, was reduced significantly after applying the correction. A comparison was made between Frost's values for the variable two-term Henyey-Greenstein phase function and those derived with the water vapor correction. The basic shape of the curve is similar to that determined bv Frost.
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