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Evolutionary impact of sputtering of the Martian atmosphere by O(+) pickup ions (1992)

Luhmann, J. G. ; Zhang, M. H. G. ; Johnson, R. E.

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Publication Date: 2019-08-28

Description: Calculations of solar wind-induced loss rates for evolving solar and atmospheric conditions like those described by Zhang et al. (1992), but including sputtering of the Martian atmosphere by reentering O(+) pickup ions, are described. The inclusion of the sputter loss increases by about 30 percent the cumulative estimated loss of oxygen to that in about 50 m of water (global surface depth) over the last 3.5 billion years. These ions also sputter CO2 and its fragments in substantial amounts. That integrated loss is equivalent to about 0.14 bar atmospheric CO2 pressure, of the order of some estimates of Mars' early atmospheric inventory.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Geophysical Research Letters (ISSN 0094-8276); 19; 21; p. 2151-2154.

Format: text

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