2006-
ASIMUT is a modular program for radiative transfer calculations in planetary atmospheres. It is one of our main tool.
ASIMUT is a modular program for radiative transfer calculations in planetary atmospheres. One of the main particularities of the software is the possibility to retrieve columns and/or profiles of atmospheric constituents simultaneously from different spectra, which may have been recorded by different instruments or obtained under different geometries. This allows the possibility to perform combined retrieval, e.g., of a ground-based measurement and a satellite-based one probing the same air mass or from spectra recorded by different instruments on the same platform. This radiative transfer code derives the Jacobians analytically and includes the optimal estimation method, using diagonal or full covariance matrices. Initially developed for the Earth’s atmosphere, its applicability has been extended to extraterrestrial atmospheres, such as those of Mars and Venus. ASIMUT has been coupled to SPHER/TMATRIX and LIDORT codes to include the complete treatment of the scattering effects in the radiative transfer calculations. ASIMUT-ALVL can be used as a forward modeling tool and also as a retrieval module. It allows to fit simultaneously or sequentially different parts of one or more spectra, to fit the surface temperature, to fit column/vertical profiles for molecular species and for aerosols, and to fully characterize the outputs (averaging kernels, errors, degrees of freedom, etc.).
The code is available on demand. We are glad to share it with the community.
