Measurements of HDO and the D/H ratio in the Martian atmosphere from ACS MIR

Ashwin Braude (1) , Franck Montmessin (1) , Kevin Olsen (2) , Margaux Vals (1) , Juan Alday (3, 2) , Loïc Rossi (1) , Alexander Trokhimovskiy (4) , Anna Fedorova (4) , Frédéric Schmidt (4) , Oleg Korablev (4) , Franck Lefèvre (1) , Lucio Baggio (1) , Abdanour Irbah (1) , Gaetan Lacombe (1) , Andrey Patrakeev (4) , Alexey Shakun (4)

1 PLANETO - LATMOS
2 AOPP - Department of Atmospheric, Oceanic and Planetary Physics [Oxford]
3 School of Physical Sciences [Milton Keynes]
4 IKI - Space Research Institute of the Russian Academy of Sciences

Measuring vertical variations in the deuterium to hydrogen ratio with altitude is essential in understanding the processes that lead to the escape of water vapour from the Martian atmosphere. We retrieve vertical profiles of HDO and H 2 O from the ACS instrument, monitoring seasonal changes particularly above the water condensation level. We discuss these results in relation to previously observed seasonal variations in D/H together with the expected variations from theoretical models.

Domaines: Planète et Univers [physics]

Ashwin Braude, Franck Montmessin, Kevin Olsen, Margaux Vals, Juan Alday, et al.. Measurements of HDO and the D/H ratio in the Martian atmosphere from ACS MIR. Europlanet Science Congress 2022, Sep 2022, Granada, Spain. pp.EPSC2022-696. ⟨insu-03776855⟩