Retrieval of atmospheric and surface parameters of Mars based on synthetic spectra (1.25 - 50 μm)

Details Retrieval of atmospheric and surface parameters of Mars based on synthetic spectra (1.25 - 50 μm) Retrieval of atmospheric and surface parameters of Mars based on synthetic spectra (1.25 - 50 μm)

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23.1603h&link_type=abstract

Advances in Space Research, Volume 23, Issue 9, p. 1603-1607.

Computer Science

3

Scientific paper

The retrieval of atmospheric thermal structure and composition as well as surface properties from measured spectra recorded by a spaceborne instrument is based on an iterative comparison with synthetic spectra of planetary radiation. Synthetic infrared spectra of Mars have been calculated for a variety of atmospheric models and surface conditions. The radiative transfer simulation method uses prestored sets of temperature and pressure dependent absorption cross-sections of CO2, H2O and CO obtained from quasi-monochromatic line-by-line calculations. Aerosol absorption and scattering efficiencies are determined from laboratory data on refractive indices applying Mie theory. Multiple aerosol scattering is considered by a successive order technique. The 15 and 2 μm CO2 bands are used to retrieve temperature profiles and surface pressure simultaneously, while the 2.0 and 2.7 μm bands allow to separate radiance contributions from atmospheric dust extinction and surface reflectance. Aerosol optical depths are primarily determined in the 8-13 μm window region. The modelling results will serve as the base for interpreting the spectroscopic measurements of the Planetary Fourier Spectrometer PFS onboard the European Mars-Express mission in 2003.

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