Atmospheric erosion and replenishment induced by impacts of cosmic bodies upon the Earth and Mars |
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| Authors: | V V Svetsov |
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| Institution: | (1) Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38-1, Moscow, 119334, Russia |
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| Abstract: | The atmospheric erosion induced by impacts of cosmic bodies with sizes from ～100 m to 10 km is calculated for the Earth with its present atmosphere and for Mars with a dense carbon dioxide atmosphere that could be at the early stages of planetary evolution. Numerical results are compared to simple analytic models and calculations performed by other authors; approximate formulas are suggested. The evolutions of early atmospheres, which could exist at the late stage of the planetary accumulation, are numerically simulated using an integral model of impact-induced atmospheric erosion and replenishment in the approximation of a one-component atmosphere with a composition determined by the basic atmosphile component of the bodies falling onto the planet. |
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