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Communication Dans Un Congrès Année : 2021

CO and O2 in the Martian atmosphere with ACS NIR onboard TGO

Franck Lefèvre
Franck Montmessin

Résumé

The molecular oxygen (O2) and carbon oxide (CO) are minor constituents of the Martian atmosphere with the annual mean mixing ratio of (1560 ± 60 ppm) and (673 ± 2.6 ppm), respectively (Krasnopolsky, 2017). Both are non-condensable species and their latitudinal variations are induced by condensation and sublimation of CO2 from the polar caps that result in enrichment and depletion and seasonal variations are following the total CO2 amount in the atmosphere.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 (Korablev et al., 2018). 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. The simultaneous vertical profiling of the O2 and CO density at altitudes of 10-60 km based on 0.76 µm and 1.57 µm bands, respectively, is a unique feature of the ACS NIR science in occultation. In this work we present the seasonal and latitudional distribution of the O2 and CO mixing ratios obtained for period of 2018-2020 (MY34 and35) and the comparison with the LMD General Circulation model. We report the averaged mixing ratio for CO of ~950 ppm and for O2 of~1800 ppm at low altitudes (~20 km). Also, we detected extremely enriched CO layer at 10-15 km in the southern polar region at Ls=100-200° both for MY34 and MY35.
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Dates et versions

insu-04437127 , version 1 (04-02-2024)

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Anna Fedorova, Franck Lefèvre, Alexander Trokhimovskiy, Oleg Korablev, Franck Montmessin, et al.. CO and O2 in the Martian atmosphere with ACS NIR onboard TGO. vEGU21, the 23rd EGU General Assembly, Apr 2021, Online, Unknown Region. pp.id.EGU21-14406, ⟨10.5194/egusphere-egu21-14406⟩. ⟨insu-04437127⟩
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