Quasi-periodic atmosphere-regolith-cap CO2 redistribution in the martian past

Details Quasi-periodic atmosphere-regolith-cap CO2 redistribution in the martian past Quasi-periodic atmosphere-regolith-cap CO2 redistribution in the martian past

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..111..305f&link_type=abstract

Icarus (ISSN 0019-1035), vol. 111, no. 2, p. 305-316

Mathematics

13

Abundance, Carbon Dioxide, Dynamic Models, Mars (Planet), Mars Atmosphere, Mars Surface, Polar Caps, Spatial Distribution, Atmospheric Pressure, Axes Of Rotation, Erosion, Mathematical Models, Obliqueness, Solar Constant, Thermal Conductivity

Scientific paper

Our earlier Mars regolith-atmosphere-cap CO2 distribution model (Fanale et al., 1982, Icarus 50, 381-407) has been improved, revised, and extended back over Mars' mid to late history. The present model takes into account four new factors: (1) a more realistic long-term obliquity cycle, (2) thermal conduction as it affects the surface energy balance, (3) the changing solar constant, and (4) atmospheric erosion 3.5 byr ago to the present. Solar insolation and temperatures are computed for the full range of obliquities, latitudes, and epochs, and a CO2 adsorption relation is used, together with a conservation of mass constraint, to calculate atmospheric pressures and exchangeable CO2 mass as functions of obliquity and epoch for the regolith, atmosphere, and polar caps for two assumed thicknesses of a basalt regolith. It is found that the heat conduction term in the surface boundary condition has an important effect in reducing the range of atmospheric pressures over the obliquity cycle at all epochs.

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