Structure of Mars' atmosphere up to 100 kilometers from the entry measurements of Viking 2

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Atmospheric Temperature, Carbon Dioxide, Mars Atmosphere, Temperature Measurement, Temperature Profiles, Viking Lander 2, Atmospheric Density, Atmospheric Pressure, Landing Sites, Vertical Distribution, Viking Mars Program

Scientific paper

Viking 2 entry data on the structure of Mars' atmosphere up to 100 kilometers define a morning atmosphere with an isothermal region near the surface; a surface pressure 10% greater than that recorded simultaneously at the Viking 1 site; and a thermal structure to 100 kilometers at least qualitatively consistent with pre-Viking modeling of thermal tides. The temperature profile exhibits waves whose amplitude grows with altitude, to about 25 K at 90 kilometers. The atmosphere is stable against convection, except possibly in some very local regions. Temperature is everywhere appreciably above the carbon dioxide condensation boundary at both landing sites, precluding the occurrence of carbon dioxide hazes in northern summer at latitudes to at least 50 deg N. Thus, ground-level mists seen in these latitudes would appear to be condensed water vapor.

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