Martian aerosols: Near-infrared spectral properties and effects on the observation of the surface

Details Martian aerosols: Near-infrared spectral properties and effects on the observation of the surface Martian aerosols: Near-infrared spectral properties and effects on the observation of the surface

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..111..317e&link_type=abstract

Icarus (ISSN 0019-1035), vol. 111, no. 2, p. 317-337

Mathematics

Logic

46

Aerosols, Atmospheric Scattering, Infrared Absorption, Infrared Spectra, Mars (Planet), Mars Atmosphere, Mars Surface, Mineralogy, Accuracy, Albedo, Calibrating, Infrared Spectroscopy, Spectral Reflectance, Spectrum Analysis

Scientific paper

Imaging sprectroscopic measurements (ISM) of Mars acquired by the ISM instrument on Phobos-2 are used to investigate the NIR spectral properties of aerosols and the effects of atmospheric scattering on inferred mineralogy of the surface. Estimates of aerosols spectra between 0.77 and 2.6 micrometers are derived above Tharsis and Ophir Planum. The spectral continua are consistent with the particle size distribution derived using data from the solar occultation experiment on-board the spacecraft (effective radius approximately = 1.2 micrometers, with an effective variance approximately = 0.2). The aerosols spectra contain water-ice absorption features and possibly absorptions due to clay and/or sulfates. The largest effect of the aerosols on surface spectra is in dark regions, where the continuum spectral slope becomes more negative and the 1-micrometers absorption due to Fe in pyroxene is shifted toward longer wavelengths. The effects of aerosols on spectra of bright regions are insufficiently large to change mineralogic interpretations based on ISM data, i.e., that bright regions in Tharsis are dominated spectrally by hematite, but that additional ferric minerals are probably present in other areas including Arabia.

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