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Le cycle du CO2 sur Mars

CO2 cycle on Mars

During the local winter, the Martian atmospheric CO2 condensate to form a layer of ice with a thickness up to 1 m. In the spring, under the effect of solar radiation, this layer of CO2 sublimates again and inflates the atmosphere. This condensation/sublimation process create a seasonal cap in both North and South polar regions.

Using hyperspectral imaging OMEGA observations, I mapped the presence of ice at the sublimation of the seasonal cap of Mars South.

The background grayscale represents the altitude and the colored traces are representing the actual OMEGA data. The yellow color indicates the presence of dust, purple color indicates the presence of CO2 ice, the indigo color indicates the presence of water ice.

Reference :

Schmidt F., Douté S., Schmitt B., Vincendon, M., Langevin, Y., Bibring J.-P. and the OMEGA Team ; “Albedo control of the Seasonal South Polar Cap recession” ; Icarus, 2009, 200, 374-394

Schmidt F., Schmitt B., Douté S., Forget, F., Jeng, J.-J., Martin, P., Langevin, Y., Bibring J.-P. and the OMEGA Team ; “Sublimation of the Martian CO2 seasonal south Polar Cap”, Planetary and Space Science, 2010, 58, 1129- 1138





IDES Université Paris-Sud 11 CNRS Faculté des Sciences
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