Simulation procedures to retrieve atmosppheric parameters from a PFS-experiment on board a future Mars mission

Abstract

A radiative transfer simulation technique is described that will be applied to retrieve atmospheric parameters from the measured infrared signatures recorded by the Planetary Fourier Spectrometer (PFS) onboard a future Mars mission. A prestored set of absorption coefficients which is based on quasi-monochromatic line-by-line calculations is used to predict the transmission functions for CO2, CO and H2O at 2.0 cm_-1 resolution in a layered atmosphere. Synthetic spectra of the Martian emergent radiance have been calculated in the 200-8000 cm_-1 wavenumber range (1.25-25 muem) for a variety of atmospheric models including the surface contribution. The influence of multiple scattering by different types of aerosols on radiative transfer is investigated on the basis of a successive order technique. Retrieval procedures and theoretical results for temperature profiles will be discussed.