The effect of dissipation processes and exogenic sources on the N-15/N-14 isotope ratio in the Mars atmosphere

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Atmospheric Composition, Exosphere, Mars Atmosphere, Nitrogen Isotopes, Carbon Dioxide, Interplanetary Dust, Nitrogen 15

Scientific paper

The N-15/N-14 isotope ratio of the Mars atmosphere was measured in two independent experiments of the Viking program, and it was shown that it is greater than the corresponding ratio in the earth's atmosphere by 62 + or - 16%. This anomalous enrichment of N-15 is considered in the framework of a model of the nonthermal dissipation of nitrogen from the Mars atmosphere. The anomalous enrichment is explained by taking into account the transport of nitrogen into the atmosphere by interplanetary dust and by the effect of CO2-content variations on the dissipation of N-14 and N-15 in the atmosphere.

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