The physical parameterization of the top-of-atmosphere reflection function for a cloudy atmosphere—underlying surface system: the oxygen A-band case study |
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Authors: | Alexander A Kokhanovsky Vladimir V Rozanov |
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Institution: | a Institute of Environmental Physics, Bremen University, P.O. Box 330440, Bremen, Germany b Institute of Physics, 70 Skarina Avenue, Minsk 220072, Belarus |
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Abstract: | The paper is devoted to the physical parameterization of the top-of-atmosphere reflection function. The accuracy of the parameterization is checked against exact radiative transfer calculations in a cloudy atmosphere for various cloud-top-heights, cloud optical and geometrical thicknesses, solar illumination and surface reflection conditions. It was found that the error of approximation is smaller than 5% for most cases studied at the wavelength interval , which corresponds to the oxygen A-band. This band is routinely used in cloud-top-height retrievals. The model proposed can be used for cloud-top-height and cloud geometrical thickness retrievals. This allows to avoid a standard look-up-table retrieval scheme, involving complex numerical procedures. |
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Keywords: | Radiative transfer Top-of-atmosphere reflection function Oxygen A-band |
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