Thermal infrared properties of the Martian atmosphere. II - The 15-micron band measurements

Details Thermal infrared properties of the Martian atmosphere. II - The 15-micron band measurements Thermal infrared properties of the Martian atmosphere. II - The 15-micron band measurements

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2843m&link_type=abstract

Journal of Geophysical Research, vol. 84, June 10, 1979, p. 2843-2852.

Physics

18

Atmospheric Temperature, Dust Storms, Infrared Spectroscopy, Mars Atmosphere, Thermal Mapping, Brightness Temperature, Latitude, Polar Caps, Satellite-Borne Instruments, Spectral Bands, Viking Orbiter Spacecraft, Viking, Infrared Thermal Mapper (Viking), Observations, Carbon Dioxide, Mars, Wavelengths, Atmosphere, Dust, Thermal Properties, Dust Storms, Diurnal Variations, Brightness, Temperatures, Seasons, Polar Regions, Condensation, Surface, Martian, Data Reduction, Annual Variations, Infrared

Scientific paper

Viking infrared thermal mapper observations of Mars in the 15-micron CO2 band reveal global atmospheric thermal behavior at the 0.3to 0.6-mbar level. Dust entrained by storms produces major modification of diurnal and latitudinal structure in the brightness temperature. In the dust-laden atmosphere of southern spring and summer 1977, the brightness temperature was a maximum in late afternoon at a latitude well south of the subsolar latitude. Diurnal amplitude was as great as 30 K, while diurnal mean temperatures exceeded 220 K. Over the northern winter polar cap, the brightness temperature increased dramatically following the second global dust storm of 1977; even in regions of polar night the change was up to 80 K. Inversions of similar magnitude resulted, and the change in downward radiance was sufficient to modify substantially the rate of CO2 condensation at the surface.

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