The O2 vertical profiles in the Martian atmosphere with the ACS-NIR onboard TGO ExoMars - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

The O2 vertical profiles in the Martian atmosphere with the ACS-NIR onboard TGO ExoMars

Résumé

The molecular oxygen is the minor constituent of the Martian atmosphere with the mean mixing ratio of (1.56 ± 0.06) 10-3. As it is a long-lived incondensable species (with the lifetime ∼60 years) the O2 mixing ratio should have latitudinal variations induced by condensation and sublimation of CO2 from the polar caps that result in enrichment and depletion and seasonal variations following the total CO2 amount in the atmosphere. The O2 column-averaged mixing ratio was provided by several ground-based observations as well as by Herschel orbiting observatory. Now the high precision measurements of the O2 mean surface mixing ratio were obtained by the quadrupole mass spectrometer as a part of Mars Science Laboratory at the Curiosity rover. The Atmospheric Chemistry Suite (ACS) is a set of three spectrometers (-NIR, -MIR, and -TIRVIM) intended to observe Mars atmosphere onboard the ESA-Roscosmos ExoMars 2016 Trace Gas Orbiter (TGO) mission. The near infrared channel (NIR) is a compact spectrometer operating in the range of 0.7-1.7 μm with a resolving power of λ/Δλ ∼ 25,000. It is designed to operate in nadir and in solar occultation modes. A vertical profiling of the O2 density based on 0.76 μm band is a unique feature of the ACS NIR science in occultation. No other instrument on a Mars orbiting platform being sensitive to O2 from 10 to 60 km altitude range. Here we present the first results of the O2 density retrievals from the ACS/NIR solar occultations for the first year of observations and the comparison with the LMD General Circulation model.
Fichier non déposé

Dates et versions

insu-04456177 , version 1 (13-02-2024)

Identifiants

Citer

Anna Fedorova, Alexander Trokhimovsky, Franck Lefèvre, Oleg Korablev, Franck Montmessin, et al.. The O2 vertical profiles in the Martian atmosphere with the ACS-NIR onboard TGO ExoMars. 21st EGU General Assembly, EGU2019, Apr 2019, Vienna & Online, Austria. pp.id.14878. ⟨insu-04456177⟩
3 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More