Martian Atmosphere Sample Return

Details Martian Atmosphere Sample Return Martian Atmosphere Sample Return

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000came.work..208m&link_type=abstract

Concepts and Approaches for Mars Exploration, p. 208

Mathematics

Logic

Mars Atmosphere, Mars (Planet), Mars Sample Return Missions, Mission Planning, Atmospheric Composition, Snc Meteorites, Water, Mars Surface

Scientific paper

The elemental and isotopic composition of the Martian atmosphere are poorly known from the analyses of Viking. The similarity between this composition and that of trapped gas inclusions in SNC (shergottites, nakhlites, chassignites) meteorites led to the conclusion that SNC were from Mars and allowed scientists to refine estimates of Mars atmospheric composition. Due to the large uncertainties remaining on the elemental and isotopic compositions of C, O, N and noble gases, extremely important problems concerning the origin and evolution of the Martian hydrosphere and atmosphere as well as for the geodynamical evolution of Mars cannot be resolved with available measurements. Specifically, the following processes require a precise knowledge of the Martian atmospheric composition: (1) Chemical and isotopic zoning in the solar nebula; (2) Accretion processes; (3) degassing of the planetary interior (catastrophic or/and continuous); (4) contributions of chondritic and cometary material; (5) solar wind input; and (6) atmospheric evolution (T. Tauri, thermal, sputtering, impact erosion). Geological features of the presence of liquid water and its present-day absence, the relative abundance of CO2 and N2, the relative abundances of noble gases, isotopic composition of hydrogen, nitrogen, argon and xenon are all puzzling features which would be explained in a comprehensive model.

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