Evaluation of ASTER input radiance considering the aerosol effect

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Abstract
The effect of aerosols on the upward radiance at the top of the atmosphere for VNIR (0.56, 0.66, and 0.81 micrometer) and SWIR (1.650, 2.165, 2.205, 2.260, 2.330, and 2.395 micrometer) of EOS/ASTER is investigated using the doubling/adding method. The realistic atmosphere-surface model includes five plane parallel sub-layers bounded by the Lambertian surface. The mid-latitude summer model of LOWTRAN 6 is adopted for molecular scattering and absorption. Three aerosol types are considered: 'dust like,' 'oceanic,' and 'water soluble' models of IRS standard aerosol with optical thickness of 0.0, 0.157, and 0.25 at 0.56 micrometers. The extinction coefficient, single scattering albedo, and phase function are computed by the Mie scattering theory. The surface albedo is 0.7 that is the practically maximum value except for ice/snow field. For the above surface albedo, the radiance at zenith direction generally shows its maximum value when the aerosol is not included, expect for the purely scattering aerosols at small solar zenith angles. Part of this study is utilized for the design of EOS/ASTER VNIR and SWIR sensors.

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