Martian atmospheric photochemistry and composition during periods of low obliquity

Physics

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Atmospheric Composition, Atmospheric Moisture, Mars Atmosphere, Mars Surface, Photochemical Reactions, Abundance, Atmospheric Models, Carbon Dioxide, Carbon Monoxide, Regolith, Mars, Atmosphere, Photochemistry, Composition, Obliquity, Variations, Carbon Dioxide, Pressure, Models, Abundance, Thermal Properties, Structure, Oxidation

Scientific paper

During periods of low obliquity, previous work has shown that martian CO2 partial pressures decreased to 0.1 mbar; CO2 partial pressure decreased to 0.02 mbar prior to the formation of the Tharsis bulge. The permanent polar caps act as a cold trap and projected global average water vapor abundances drop to possibly as low as 10-5 precipitable μm. As a result, the odd hydrogen catalytic cycle would not be effective at recombining CO and O back into CO2, and as much as 0.12 mbar of CO and 0.06 mbar of O2 could exist. These increased abundances would radically affect surface oxidation, change the lower atmospheric thermal structure, and completely alter the upper atmosphere.

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