Mars - The role of the regolith in determining atmospheric pressure and the atmosphere's response to insolation changes

Details Mars - The role of the regolith in determining atmospheric pressure and the atmosphere's response to insolation changes Mars - The role of the regolith in determining atmospheric pressure and the atmosphere's response to insolation changes

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2321f&link_type=abstract

Journal of Geophysical Research, vol. 83, May 10, 1978, p. 2321-2325.

Physics

3

Adsorption, Atmospheric Pressure, Carbon Dioxide, Insolation, Mars Atmosphere, Rocks, Atmospheric Composition, Atmospheric Models, Oxygen 18, Planetary Evolution, Pressure Measurement, Mars, Regolith, Atmosphere, Carbon Dioxide, Climate, Models, Origin

Scientific paper

A quantitative model for atmosphere-regolith exchange of CO2 on Mars is presented. The model, based on new laboratory measurements of CO2 adsorption on ground rock at 158, 175, 196, and 231 K for CO2 pressures from 1.0 to 80 mbar, is consistent with Viking observations, while models involving a massive residual CO2 cap and no long-term atmosphere-regolith CO2 exchange are not consistent. The model indicates: (1) the atmosphere-plus-cap system is buffered on a long-term basis by exchangeable CO2 adsorbed in the regolith; (2) if the atmosphere-plus-cap system suddenly disappeared, the system would eventually be almost completely restored by reequilibration with the regolith; (3) exchange with the adsorbed phase in the regolith has greatly restricted O-18 enrichment of the atmosphere; (4) the layered terrain primarily represents current periodic pressure increases; and (5) pressures of 100-300 nbar might have existed during the early history of the planet.

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