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Article Dans Une Revue Planetary and Space Science Année : 2010

Sublimation of the Martian CO2 seasonal South Polar Cap.

Résumé

The polar condensation/sublimation of CO2, that involve about one fourth of the atmosphere mass,is the major Martian climatic cycle.Early observations in visible and thermal infrared have shown that the sublimation of the Seasonal South Polar Cap (SSPC) is not symmetric around the geographic South Pole. Here we use observations by OMEGA/Mars Express in the near-infrared to detect un ambiguously the presence of CO2 at the surface, and to estimate albedo. Second,we estimate the sublimation of CO2 released in the atmosphere and show that there is a two-stepprocess.FromLs¼180° to 220°, the sublimation is nearly symmetric with a slight advantage for the cryptic region.After Ls¼220° the anti-cryptic region sublimation is stronger. Those two phases are not balanced such that there is 22% +- 9 more mass the anti-cryptic region,arguing for more snow precipitation. We compare those results with the MOLA height measurements. Finally we discus simplications for the Martian atmosphere about general circulation and gas tracers,e.g.Ar.

Domaines

Planétologie

Dates et versions

hal-00530185 , version 1 (27-10-2010)

Identifiants

Citer

F. Schmidt, B. Schmidt, S. Doute, F. Forget, J.J. Jian, et al.. Sublimation of the Martian CO2 seasonal South Polar Cap.. Planetary and Space Science, 2010, 58 ((10)), pp.:1129-1138 (IF 2.067). ⟨10.1016/j.pss.2010.03.018⟩. ⟨hal-00530185⟩
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