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Computation of solar radiation flux within a fog layer is essential during the dissipation stage. A new parameterization of the asymmetry factor g and of the single scattering albedo ω allows the use of a monospectral model (FB), already designed for cloudy layer by Fouquart and Bonnel (1980). This new parameterization is necessary because of the different droplet size distributions existing in clouds and fogs. A calculation method of new g and ω values, in function of the optical thickness δ and of the effective radius re of droplet size distribution is proposed.

A method is given for calculating the absorption coefficient spectra k ( v ) from experimental data in a real atmosphere for narrow spectral intervals centered in a CO 2 absorption band (λ = 740 cm −1 ). The results have been compared with radiometric data and are useful for calculating emission and absorption in the atmosphere.