22 December 2006 Application of the equivalence theorem to simulate GOSAT observation data under cirrus-present condition
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Abstract
We describe an original methodology to account for aerosol and cirrus cloud contributions to reflected sunlight. This method can be applied to the problem of retrieving greenhouse gases from satellite-observed data and is based on the equivalence theorem with further parameterization of the photon path-length probability density function (PPDF). Monte Carlo simulation was used to validate this parameterization for a vertically non-homogeneous atmosphere including an aerosol layer and cirrus clouds. Initial approximation suggests that the PPDF depends on four parameters that can be interpreted as the effective cloud height, cloud relative reflectance, and two additional factors to account for photon path-length distribution under the cloud. We demonstrate that these parameters can be efficiently retrieved from the nadir radiance measured in the oxygen A-band and from the H2O-saturated area of the CO2 2.0 ?m spectral band.
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Sergey Oshchepkov, Sergey Oshchepkov, Andrey Bril, Andrey Bril, Tatsuya Yokota, Tatsuya Yokota, Gen Inoue, Gen Inoue, } "Application of the equivalence theorem to simulate GOSAT observation data under cirrus-present condition", Proc. SPIE 6405, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications, 640509 (22 December 2006); doi: 10.1117/12.693537; https://doi.org/10.1117/12.693537
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