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Photochemical depletion of heavy CO isotopes in the Martian atmosphere

Montmessin, Franck; Belyaev, Denis A.; Fedorova, Anna A. +12 more

The atmosphere of Mars is enriched in heavy isotopes with respect to Earth as a result of the escape of the atmosphere to space over billions of years. Estimating this enrichment requires a rigorous understanding of all atmospheric processes that contribute to the evolution of isotopic ratios between the lower and upper atmosphere, where escape pr…