A COMPARISON OF RADIATION TRANSFER ALGORITHMS FOR MODELING OF THE ZENITH SKY RADIANCE OBSERVATIONS USED FOR DETERMINATION OF STRATOSPHERIC TRACE GASES AND AEROSOL

摘要

S A preliminary comparison of radiative transfer codes applicable to the algorithms of the gas and aerosol profile retrieval from skylight measurements performed at solar zenith angles of about 90° was carried out. There are compared codes of the Monte Carlo simulation, a code of successive orders of scattering, and a code based on the Combined Differential-Integral approach involving the Picard Iterative Approximation (CDIPI). For solar zenith angles from 0° to 93° and wavelengths 311, 332, 450 and 800 nm, the results obtained with different codes agree with accuracy of a few percent. For solar zenith angles larger than 94° a qualitative agreement of three codes is obtained. For these angels agreement better than 5% between the Monte Carlo and the CDIPI codes was received in all cases for atmosphere without aerosol.