A Semi-Analytic Technique to Integrate the Radiative Transfer Equation over Optical Depth

B. M. Herman Institute of Atmospheric Physics, The University of Arizona, Tucson 85721

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W. Asous Institute of Atmospheric Physics, The University of Arizona, Tucson 85721

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S. R. Browning Institute of Atmospheric Physics, The University of Arizona, Tucson 85721

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Abstract

A method of fitting polynomials to the intensity distribution as a function of optical depth is described for use with the Gauss-Seidel iterative technique for solving the equation of radiative transfer. This technique enables the τ integration to he performed analytically, thus permitting accurate and rapid solutions for optically thick atmospheres. Results are shown for values of τ up to 50, and various cheeks indicate that the method maintains an accuracy of better than 1%.

Abstract

A method of fitting polynomials to the intensity distribution as a function of optical depth is described for use with the Gauss-Seidel iterative technique for solving the equation of radiative transfer. This technique enables the τ integration to he performed analytically, thus permitting accurate and rapid solutions for optically thick atmospheres. Results are shown for values of τ up to 50, and various cheeks indicate that the method maintains an accuracy of better than 1%.

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