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Title:
Xenological constraints on the impact erosion of the early Martian atmosphere
Authors:
Zahnle, K. J.
Affiliation:
AA(NASA, Ames Research Center, Moffett Field, CA)
Publication:
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E6, p. 10,899-10,913. (JGR Homepage)
Publication Date:
06/1993
Category:
Lunar and Planetary Exploration; Mars
Origin:
STI
NASA/STI Keywords:
Atmospheric Composition, Carbon Dioxide Concentration, Erosion, Mars Atmosphere, Xenon Isotopes, Carbonaceous Rocks, Constraints, Rare Gases
Keywords:
MARS, ATMOSPHERE, EROSION, IMPACT EFFECTS, DEPLETION, RARE GASES, NITROGEN, XENON, HYPOTHESES, ARGON, ESCAPE, CALCULATIONS, MODEL, VELOCITY, EVOLUTION, VOLATILES, ISOTOPES, PARAMETERS, REGOLITH, CARBON DIOXIDE, COMETS, OUTGASSING, RECYCLING, IMPACTORS, COMPOSITION
DOI:
10.1029/92JE02941
Bibliographic Code:
1993JGR....9810899Z

Abstract

This paper considers impact erosion as the agent of the early Martian atmophere escape, by examining xenon-related constraints imposed on the impact erosion. It is found that, if impact erosion of a planetary atmosphere is important, the remnant atmosphere is likely to fall into one of two qualitatively distinct categories: (1) cometary xenon has an unexpected isotopic composition or (2) factors other than impacts, such as outgassing or recycling, are needed. Neither of these categories can readily account for the present Martian atmosphere.
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