Martian Northern Polar Latitudes: the Winter Atmosphere From Mariner 9 IRIS Data

Details Martian Northern Polar Latitudes: the Winter Atmosphere From Mariner 9 IRIS Data Martian Northern Polar Latitudes: the Winter Atmosphere From Mariner 9 IRIS Data

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.5119z&link_type=abstract

American Astronomical Society, DPS Meeting #32, #51.19; Bulletin of the American Astronomical Society, Vol. 32, p.1097

Astronomy and Astrophysics

Astronomy

Scientific paper

Several hundred spectra were obtained at latitudes > 65N in late northern winter (Ls = 322o -352o ). Solar zenith angles ranged from 75o to 125o ; however, most of these spectra were obtained in polar darkness. The data reveal complex spectral features, including a complex shape in the 15μ m CO2 band. Temperature profiles and aerosol opacities were retrieved in a self consistent way. Temperature profiles show an inversion at 5-10 km above the local surface. At higher levels the temperature decreases with altitude, reaching a minimum near 20 km; above that it increases again up to 40-45 km. A near surface fog, consisting of H2O ice particles, was found with optical depth at 10μ m ranging from 0.1 to greater than 1 (with typical values 0.3-0.5). For an exponential model, its scale height was found to be 1-2 km, with a mean particle radius of about 1 μ m (assuming a normal particle size distribution). Total water content in the fog is 1-10 pr μ m. Most of the spectral features in the range 200-900 cm-1 are successfully reproduced by this model. Condensation of CO2 may occur at 10-25 km altitudes for latitudes > 75N. A deposit of CO2 may exist, with CO2 condensation clouds present, for latitudes > 80N and in some cold spots from 70-80N.

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