Behavior of volatiles in Mars' polar areas - A model incorporating new experimental data

Physics

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Atmospheric Models, Carbon Dioxide, Mars Atmosphere, Polar Caps, Volatility, Water Vapor, Albedo, Annual Variations, Atmospheric Moisture, Atmospheric Pressure, Atmospheric Temperature, Viking Orbiter 2

Scientific paper

A model has been developed to explain the north polar water vapor results obtained by the Viking orbiter Mars atmospheric water detector; it has also been used to compute the thickness of seasonally deposited CO2 frost, the variation of the total atmospheric pressure, and wind velocities due to mass motions associated with CO2 condensation. A north polar water ice thickness in excess of 1 m and an ice albedo a of 0.34(+0.06,-0.03) are inferred from a comparison of the model and experimental data. The model results confirm an earlier conclusion that the atmosphere over the ice is saturated. It is suggested that concentration of the atmospheric inert gases in the polar region, combined with local topography and arctic circulation patterns, could be responsible for the south remnant cap not being at the south pole

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