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The Martian atmosphere and surface observed by NOMAD on ExoMars Trace Gas Orbiter

Presentation #307.05 in the session Characterizing the Martian Atmosphere, All the Way Up (Oral Presentation)

Published onOct 23, 2023
The Martian atmosphere and surface observed by NOMAD on ExoMars Trace Gas Orbiter

The NOMAD (“Nadir and Occultation for MArs Discovery”) spectrometer suite on board the ExoMars Trace Gas Orbiter (TGO) has been designed to investigate the composition of Mars’ atmosphere, with a particular focus on trace gases, clouds, and dust. The instrument probes the ultraviolet and infrared regions covering large parts of the 0.2-4.3 µm spectral range [1,2], with 3 spectral channels: a solar occultation channel (SO – Solar Occultation; 2.3–4.3 μm), a second infrared channel capable of nadir, solar occultation, and limb sounding (LNO – Limb Nadir and solar Occultation; 2.3–3.8 μm), and an ultraviolet/visible channel (UVIS – Ultraviolet and Visible Spectrometer, 200–650 nm). NOMAD performs solar occultation, nadir and limb observations dedicated to the determination of the composition and the structure of the Martian atmosphere.

TGO started its science phase in April 2018 and instruments have been accumulating since then. We will present selected results obtained by the NOMAD instrument covering the atmosphere and the surface of Mars with observations of several trace gases, dust, clouds, and surface ices. We report on the different discoveries and results highlighted in a recent special issue on the ExoMars Trace Gas Orbiter mission, like updates of CO2 and temperature vertical profiles, studies of aerosol nature and distribution, carbon monoxide distribution, ozone climatology and relation with water vaper, airglow observations, detection of clouds, surface ices and in general advances in the analysis of the spectra recorded by the three channels of NOMAD.


[1] Vandaele, A.C., et al., 2015. Planet. Space Sci. 119, 233-249.

[2] Vandaele et al., 2018. Space Sci. Rev., 214:80,

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