Isotopic composition of the Martian atmosphere

Details Isotopic composition of the Martian atmosphere Isotopic composition of the Martian atmosphere

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sci...194...68n&link_type=abstract

Science, vol. 194, Oct. 1, 1976, p. 68-70.

Computer Science

20

Atmospheric Composition, Mars Atmosphere, Nitrogen Isotopes, Oxygen Isotopes, Viking Lander 1, Abundance, Atmospheric Pressure, Carbon Dioxide, Earth Atmosphere, Mass Spectroscopy, Nitrogen 15, Upper Atmosphere, Water

Scientific paper

Results from the neutral mass spectrometer carried on the aeroshell of Viking 1 show evidence for NO in the upper atmosphere of Mars and indicate that the isotopic composition of carbon and oxygen is similar to that of earth. Mars is enriched in N-15 relative to earth by about 75 per cent, a consequence of escape that implies an initial abundance of nitrogen equivalent to a partial pressure of at least 2 millibars. The initial abundance of oxygen present either as CO2 or H2O must be equivalent to an exchangeable atmospheric pressure of at least 2 bars in order to inhibit escape-related enrichment of O-18.

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