Intercomparison of millimeter-wave radiative transfer models

This study analyzes the performance of the Eddington second-order approximation with and without δ-scaling, the Neumann iterative method, and the Monte Carlo method at millimeter-wave frequencies. The reliability and consistency of these radiative transfer models is identified and the differences and source of those differences in brightness temperatures that may originate in the forward computations are examined. In addition, computation speeds of the radiative transfer calculations are also compared for evaluation.