The evolution of CO2 on Mars

Details The evolution of CO2 on Mars The evolution of CO2 on Mars

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..232k&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program p 232-234 (SEE N85-23474 13-91)

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1

Carbon Dioxide, Mars Surface, Moisture, Planetary Evolution, Water, Geochemistry, Geothermal Anomalies, Mars Atmosphere, Sedimentary Rocks, Structural Properties (Geology)

Scientific paper

The consequences of the hypothesis that the evolution of CO2 is directly linked to the occurrence of at least transitory pockets of moisture were exposed. The current conditions preclude the existence of open bodies of liquid water and the formation of moisture in disequilibrium is not excluded by any known constraints. The water evaporation rate is inversely proportional to PCO2, and the existence of a limiting value (P*) for which liquid water can form in the Mars environment is postulated. The evolution of PCO2 is controlled largely by relatively rapid aqueous chemistry forming carbon-containing sedimentary rocks, perhaps during early history in open water, but more recently in transitory pockets of moisture in the soil. Once the total atmospheric pressure is reduced to near P*, the occurrence of transitory moisture is inhibited, and atmospheric CO2 is no longer depleted by an efficient mechanism. The role of the carbonate reservoir in the current overall carbon budget on Mars, according to this scheme, is illustrated.

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