Simultaneous observations of HCl, ozone, and water vapour with ACS MIR on the ExoMars Trace Gas Orbiter. - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2021

Simultaneous observations of HCl, ozone, and water vapour with ACS MIR on the ExoMars Trace Gas Orbiter.

Résumé

The Atmospheric Chemistry Suite (ACS) on the ExoMars Trace Gas Orbiter (TGO) has been collecting high quality science data for over three years. ACS is a cross-dispersion spectrometer that uses the solar occultation technique to measure vertical profiles of the abundances of atmospheric gases by observing how much infrared solar radiation they absorb. This presentation focuses on the spectral region between 2800 and 3100 cm-1 as observed by the mid-infrared channel (ACS MIR), where we can measure HCl, O3, CH4, H2O, and HDO. HCl is a gas that may indicate active volcanic activity on Mars. Its discovery, presented here, was made using ACS MIR observations from shortly after the global dust storm in 2018 (Mars year 34). It exhibits seasonal behaviour appearing during the dusty season when it is summer in the southern hemisphere, and is strongly correlated with water vapour. Ozone has been previously observed at high altitudes using transitions in the ultraviolet. ACS MIR is able to distinguish O3 spectral features at low altitudes in the infrared. O3 has an opposing seasonal cycle to HCl and is anti-correlated to water vapour. The fine vertical resolution of ACS allows for the first time the direct comparison of simultaneously measured gaseous species along the vertical. Here we present comparisons of trace gas abundances with each other, dust and ice aerosols, and temperature to investigate the chemistry that governs their seasonal behaviour.
Fichier non déposé

Dates et versions

insu-04436740 , version 1 (03-02-2024)

Identifiants

Citer

Kevin Olsen, Anna Fedorova, Francois Forget, Ehouarn Millour, Antoine Bierjon, et al.. Simultaneous observations of HCl, ozone, and water vapour with ACS MIR on the ExoMars Trace Gas Orbiter.. AGU Fall Meeting 2021, Dec 2021, New Orleans, United States. pp.id. P31B-07. ⟨insu-04436740⟩
13 Consultations
0 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More