Vol. 10, issue 10, article # 2

pdf McCormick N. J., Sanchez R., Yi H. C. Cloud optical thickness estimation from ground-level measurements. // Atmospheric and oceanic optics. 1997. V. 10. No. 10. P. 702-708.
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Two methods for estimating the unknown optical thickness of a homogeneous cloudy atmosphere using a ground-level downward radiance or irradiance measurement are presented. An iteration method incorporates an analytically-computed first derivative of the unknown that is obtained from the FN method of transport theory; sample results from a sensitivity analysis for the iteration scheme are included. A noniterative method derived from two analytical solutions of the equation of radiative transfer is also given – an asymptotic radiative transfer algorithm and a transport-corrected diffusion algorithm.