Martian north polar hazes and surface ice - Results from the Viking Survey/Completion mission

Details Martian north polar hazes and surface ice - Results from the Viking Survey/Completion mission Martian north polar hazes and surface ice - Results from the Viking Survey/Completion mission

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.4587c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 10, 1984, p. 4587-4596.

Physics

50

Cloud Glaciation, Infrared Signatures, Mars Atmosphere, Mars Surface, Polar Caps, Viking Orbiter 1, Annual Variations, Brightness Temperature, Glaciology, Haze, Infrared Scanners, Opacity, Thermal Mapping, Mars, Polar Regions, Ice, Surface, Viking Missions, Observations, Infrared, Wavelengths, Optical Properties, Opacity, Abundance, Water, Condensates, Comparisons, Seasonal Variations, Viking 1 Orbiter, Irtm, Infrared Thermal Mapper, Mars Atmospheric Water Vapor Detector, Mawd, Spectra, Absorption

Scientific paper

Viking infrared observations of the Martian north polar regions have been used to locate, to determine the composition, and to estimate the temperature and opacity of hazes above the edge of the retreating seasonal cap for the period from late winter to midspring (Ls = 240° - 86°). These hazes, composed of water ice, are remarkably uniform and are present for most of the period of observations. The cloud temperatures appear to vary from ≡210K near the cap edge to values below 180K over the cap interior. Comparison of these estimated temperatures with Viking radio occultation profiles from the previous spring and with simultaneous IRTM T15 values suggests that the polar haze is 3 - 8 km above the surface. The visible opacities of the clouds are approximately unity, equivalent to 1 - 2 pr μm of water vapor. The polar hazes may provide a temporary reservoir for water.

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