On the atmospheric origin of weak absorption features in the infrared spectrum of Mars

Mathematics – Logic

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Atmospheric Attenuation, Carbon Dioxide Concentration, Carbon Monoxide, Infrared Spectra, Mars Atmosphere, Mars Surface, Mineralogy, Near Infrared Radiation, Partial Pressure, Rotational Spectra, Spectral Bands, Vibrational Spectra

Scientific paper

Two weak absorption features identified in the near-infrared of Mars, at 2.35 and 3.8 microns, have been tentatively identified as mineralogic signatures. These features are mostly due to the Martian atmosphere. The 3.8-microns feature, as well as other weaker features around 3.6 and 4 microns, is probably due to weak isotopic bands of carbon dioxide and is well fitted with a nominal atmospheric model assuming a CO2 pressure of 7 mbar at the zero-altitude level. The 2.35-microns feature observed in the region of Arabia is primarily due to the 2-0 band of CO in the Martian atmosphere and, at first order, is well fitted with the same nominal atmospheric model, assuming the canonical value CO/CO2 = 0.0007. There might be a weak remaining absorption of mineralogic origin, especially at 2.285 and 2.41 microns.

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