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The evidence for unusually high hydrogen abundances in the central part of Valles Marineris on Mars

Mitrofanov, I.; Zelenyi, L.; Malakhov, A. +6 more

Studies of hydrogen deposition in the shallow Martian subsurface have been conducted by two neutron and one gamma-ray detectors in the past and provided global hydrogen maps (Boynton et al., 2002; Feldman et al., 2002; Mitrofanov et al., 2002). It is known from these maps that hydrogen is most abundant in the polar permafrost areas compared to the…

Photochemistry of HCl in the martian atmosphere

Krasnopolsky, Vladimir A.

The recent discovery of HCl in the martian atmosphere using the ExoMars Trace Gas Orbiter (Korablev et al., 2021, Sci. Adv. 7, eabe4386) during a global dust storm indicates a correlation between the HCl appearance and dust. Here this idea is studied using one-dimensional photochemical modeling on two summer midlatitude sites in the aphelion and p…

Atmospheric processes affecting methane on Mars

Rauer, H.; Arnold, G.; Herbst, K. +6 more

It is currently uncertain as to whether methane exists on Mars. Data from the Curiosity Rover suggests a background methane concentration of a few tenths parts per billion whereas data from the Trace Gas Orbiter suggest an upper limit of twenty parts per trillion. If methane exists on Mars then we do not understand fully the physical and chemical …

Reflectance study of ice and Mars soil simulant associations-II. CO₂ and H₂O ice

Thomas, Nicolas; Pommerol, Antoine; Poch, Olivier +1 more

We measure the visible and near-infrared reflectance of icy analogues of the Martian surface made of CO₂ ice associated in different ways with H₂O ice and the regolith simulant JSC Mars-1. Such experimental results obtained with well-controlled samples in the laboratory are precious to interpret quantitatively the imaging and…