Modeling the Martian HDO cycle with a Global Climate Model during the “dusty” season

Margaux Vals (1) , Franck Montmessin (1) , Loïc Rossi (1) , Ashwin Braude (1) , Franck Lefèvre (1) , Francisco Gonzalez-Galindo (2) , Jean-Yves Chaufray (1) , Anna Fedorova (3) , Juan Alday (4, 5) , François Forget (6) , Ehouarn Millour (6) , Oleg Korablev (3) , Alexander Trokhimovskiy (3) , Alexey Shakun (3)

1 PLANETO - LATMOS
2 IAA - Instituto de Astrofísica de Andalucía
3 IKI - Space Research Institute of the Russian Academy of Sciences
4 AOPP - Department of Atmospheric, Oceanic and Planetary Physics [Oxford]
5 School of Physical Sciences [Milton Keynes]
6 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)

The D/H ratio measured in the Martian atmosphere gives an estimation of the planet’s water escape rate. We present here a global circulation model including the water isotope HDO and the main physical processes of fractionation. Modeling the D/H cycle accompanies the recent measurements from the ACS spectrometer onboard the orbiter TGO. The comparison between the model outputs and the TGO/ACS observations reveal some discrepancies, in particular during the second half of the martian year, when the escape is supposed to be the most efficient. The present work aims at studying these main differences.

Domaines: Planète et Univers [physics]

Margaux Vals, Franck Montmessin, Loïc Rossi, Ashwin Braude, Franck Lefèvre, et al.. Modeling the Martian HDO cycle with a Global Climate Model during the “dusty” season. Europlanet Science Congress 2022, Sep 2022, Granada, Spain. pp.EPSC2022-451, ⟨10.5194/epsc2022-451⟩. ⟨insu-03840870⟩