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| Titel |
Influence of suprathermal atoms on the escape and evolution of Mars’ CO2 atmosphere |
| VerfasserIn |
Ute Amerstorfer, Hannes Gröller, Herbert Lichtenegger, Helmut Lammer, Feng Tian, Lena Noack, Manuel Scherf, Colin Johnstone, Lin Tu, Manuel Güdel |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250151136
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| Publikation (Nr.) |
 EGU/EGU2017-15689.pdf |
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| Zusammenfassung |
| We study the escape of hot oxygen and carbon from the martian atmosphere for four points in
time in its history corresponding to 1, 3, 10, and 20 times the present solar EUV flux with a
Monte-Carlo model. Different source reactions of hot oxygen and carbon atoms in the
thermosphere and their changing importance with the EUV flux are discussed. Furthermore,
we discuss different magma ocean related and volcanic CO2 outgassing scenarios and
their interplay with thermal and non-thermal loss processes. Our results show that
Mars could not have had a dense atmosphere at the end of the Noachian epoch,
since such an atmosphere would not have been able to escape until today. However,
early Mars could have been hot and wet during the pre-Noachian era with surface
CO2 pressures larger than 1 bar during the first 300 Myr after the planets origin. |
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