Loss of Atmosphere from Mars Due to Solar Wind-Induced Sputtering

Details Loss of Atmosphere from Mars Due to Solar Wind-Induced Sputtering Loss of Atmosphere from Mars Due to Solar Wind-Induced Sputtering

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...268..697k&link_type=abstract

Science, Volume 268, Issue 5211, pp. 697-699

Computer Science

66

Scientific paper

Because Mars does not have a strong intrinsic magnetic field, the atmosphere is eroded by interactions with the solar wind. Early solar-system conditions enhanced the sputtering loss. It is calculated that ~3 bars of carbon dioxide (CO_2) have been sputtered over the last 3.5 billion years. This significant increase over the previous estimate by Luhmann et al. of ~0.14 bar of CO_2 is the result of the development of a more complete model. The model also predicts slightly greater loss of water-~80 meters instead of the ~50 meters predicted by Luhmann et al. Because estimates of CO_2 on early Mars range from 0.5 to 5 bars, the 0.14-bar estimate is insignificant but the ~3-bar estimate will have a large effect on our understanding of the planet's evolution.

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