| Autor: |
Juan Alday, Alexander Trokhimovskiy, Manish Patel, Anna Fedorova, Franck Lefèvre, Franck Montmessin, James Holmes, Kylash Rajendran, Jon Mason, Kevin Olsen, Denis Belyaev, Oleg Korablev, Lucio Baggio, Andrey Patrakeev, Alexey Shakun |
| Rok vydání: |
2023 |
| DOI: |
10.21203/rs.3.rs-2370988/v1 |
| Popis: |
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 the enrichment in heavy isotopes due to atmospheric escape requires a rigorous understanding of all atmospheric processes that contribute to the evolution of isotopic ratios between the lower and upper atmosphere, where escape processes take place. Using a combination of vertical profiles from the Atmospheric Chemistry Suite (ExoMars Trace Gas Orbiter) with the predictions of a photochemical model, we provide evidence for a new process of photochemistry-induced fractionation that depletes the heavy isotopes of C and O in CO. Accounting for this new source of fractionation, we find that only a fraction of ≈12% of the atmosphere needs to have been lost to space through CO photochemical escape to explain the enrichment of 13C/12C in CO2 measured by the Curiosity Rover. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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