Retrieval of Martian Atmospheric CO Vertical Profiles From NOMAD Observations During the First Year of TGO Operations - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research. Planets Année : 2023

Retrieval of Martian Atmospheric CO Vertical Profiles From NOMAD Observations During the First Year of TGO Operations

Ashimananda Modak
  • Fonction : Auteur
Miguel Angel López-Valverde
  • Fonction : Auteur
Adrian Brines
  • Fonction : Auteur
Aurélien Stolzenbach
  • Fonction : Auteur
Bernd Funke
  • Fonction : Auteur
Francisco González-Galindo
  • Fonction : Auteur
Brittany Hill
  • Fonction : Auteur
Shohei Aoki
  • Fonction : Auteur
Ian Thomas
  • Fonction : Auteur
Giuliano Liuzzi
  • Fonction : Auteur
Gerónimo Villanueva
  • Fonction : Auteur
Justin Erwin
  • Fonction : Auteur
José Juan Lopez Moreno
  • Fonction : Auteur
Nao Yoshida
  • Fonction : Auteur
Udo Grabowski
  • Fonction : Auteur
Frank Daerden
  • Fonction : Auteur
Bojan Ristic
  • Fonction : Auteur
Giancarlo Bellucci
  • Fonction : Auteur
Manish Patel
  • Fonction : Auteur
Loic Trompet
  • Fonction : Auteur
Ann-Carine Vandaele
  • Fonction : Auteur

Résumé

We present CO density profiles up to about 100 km in the Martian atmosphere obtained for the first time from retrievals of solar occultation measurements by the Nadir and Occultation for Mars Discovery (NOMAD) onboard ExoMars Trace Gas Orbiter (TGO). CO is an important trace gas on Mars, as it is controlled by CO2 photolysis, chemical reaction with the OH radicals, and the global dynamics. However, the measurements of CO vertical profiles have been elusive until the arrival of TGO. We show how the NOMAD CO variations describe very well the Mars general circulation. We observe a depletion of CO in the upper troposphere and mesosphere during the peak period, LS = 190°-200°, more pronounced over the northern latitudes, confirming a similar result recently reported by Atmospheric Chemistry Suite onboard TGO. However, in the lower troposphere around 20 km, and at least at high latitudes of the S. hemisphere, NOMAD CO mixing ratios increase over 1,500 ppmv during the GDS (Global Dust Storm) onset. This might be related to the downwelling branch of the Hadley circulation. A subsequent increase in tropospheric CO is observed during the decay phase of the GDS around LS = 210°-250° when the dust loading is still high. This could be associated with a reduction in the amount of OH radicals in the lower atmosphere due to lack of solar insolation. Once the GDS is over, CO steadily decreases globally during the southern summer season. A couple of distinct CO patterns associated with the Summer solstice and equinox circulation are reported and discussed.
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Dates et versions

insu-04196530 , version 1 (08-12-2023)

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Ashimananda Modak, Miguel Angel López-Valverde, Adrian Brines, Aurélien Stolzenbach, Bernd Funke, et al.. Retrieval of Martian Atmospheric CO Vertical Profiles From NOMAD Observations During the First Year of TGO Operations. Journal of Geophysical Research. Planets, 2023, 128, ⟨10.1029/2022JE007282⟩. ⟨insu-04196530⟩
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