The HDO cycle on Mars : Comparison of ACS observations with GCM simulations - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Journal of Geophysical Research. Planets Year : 2022

The HDO cycle on Mars : Comparison of ACS observations with GCM simulations

Loïc Rossi
Connectez-vous pour contacter l'auteur
Margaux Vals
  • Function : Author
  • PersonId : 1107216
Franck Montmessin
Franck Lefèvre


The D/H ratio and its implications on the atmospheric escape, make it an essential observable to study the current and past inventory of water on Mars. With the arrival of the Trace Gas Orbiter around Mars, new measurements of the D/H ratio are now available and require tools to interpret the observations and understand the HDO cycle. We here present simulations of an updated version of the LMD Mars GCM which includes HDO and in particular the fractionation processes it undergoes. We compare our model simulations with the HDO observations in solar occultation from ACS-MIR on-board TGO (Alday et al., 2021). The model successfully reproduces the general trends of the D/H ratio, indicating that the main physical processes are captured by theory. A consistent simulation of condensation processes is found to be key in the representation of the D/H ratio. Improvements in the representation of clouds and on the water cycle will help improving the representation of the HDO cycle and better help extrapolate back in times the conditions of water escape on Mars.
Fichier principal
Vignette du fichier
JGR Planets - 2022 - Rossi - The HDO Cycle on Mars Comparison of ACS Observations With GCM Simulations.pdf (4.54 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03740469 , version 1 (21-07-2023)





Loïc Rossi, Margaux Vals, Juan Alday, Franck Montmessin, Anna Fedorova, et al.. The HDO cycle on Mars : Comparison of ACS observations with GCM simulations. Journal of Geophysical Research. Planets, 2022, 127 (8), pp.e2022JE007201. ⟨10.1029/2022JE007201⟩. ⟨insu-03740469⟩
36 View
5 Download



Gmail Facebook X LinkedIn More