Abstract
We present two spherical-shell background Monte Carlo radiative transfer codes, designed to calculate the spectral-angular characteristics of the field of thermal radiation, taking into account the 3D cloud effects. The implementation of the radiative models includes light scattering, reflection from the surface according the Lambert's law, absorption by cloud and aerosol particles, and thermal emission utilizing the Planck function. Cloud fields are simulated on the basis of a Poisson model of broken clouds; clouds are approximated by truncated paraboloids of rotation. These algorithms differ in the methods of accounting for the molecular absorption. The first approach is based on the use of the traditional k-distribution technique. The second approach utilizes a modification of the method of randomization in frequency, which is implemented in certain line-by-line radiation codes. The accuracy of the codes has been evaluated against independent calculations (horizontally homogeneous atmosphere) and through cross-checks of our algorithms (inhomogeneous clouds) with satisfactory results. In this work we present examples of calculating the spectral outgoing radiance in the range of 720–1660 cm−1 in two different cloud realizations and under various observation conditions.
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