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Variations in Vertical CO/CO2 Profiles in the Martian Mesosphere and Lower Thermosphere Measured by the ExoMars TGO/NOMAD: Implications of Variations in Eddy Diffusion Coefficient

dc.contributor.authorYoshida, N.
dc.contributor.authorNakagawa, H.
dc.contributor.authorAoki, S.
dc.contributor.authorErwin, J.
dc.contributor.authorVandaele, A.C.
dc.contributor.authorDaerden, F.
dc.contributor.authorThomas, I.
dc.contributor.authorTrompet, L.
dc.contributor.authorKoyama, S.
dc.contributor.authorTerada, N.
dc.contributor.authorNeary, L.
dc.contributor.authorMurata, I.
dc.contributor.authorVillanueva, G.
dc.contributor.authorLiuzzi, G.
dc.contributor.authorLopez-Valverde, M.A.
dc.contributor.authorBrines, A.
dc.contributor.authorModak, A.
dc.contributor.authorKasaba, Y.
dc.contributor.authorRistic, B.
dc.contributor.authorBellucci, G.
dc.contributor.authorLópez-Moreno, J.J.
dc.contributor.authorPatel, M.
dc.date2022
dc.date.accessioned2022-05-31T10:09:43Z
dc.date.available2022-05-31T10:09:43Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/9947
dc.descriptionAbstract Using the Nadir and Occultation for MArs Discovery instrument aboard Trace Gas Orbiter, we derived the CO/CO2 profiles between 75 and 105 km altitude with the equivalent width technique. The derived CO/CO2 profiles showed significant seasonal variations in the southern hemisphere with decreases near perihelion and increases near aphelion. The estimation of the CO/CO2 profiles with a one-dimensional photochemical model shows that an altitude-dependent eddy diffusion coefficient better reproduces the observed profiles than a vertically uniform one. Our estimation suggests that the eddy diffusion coefficient in Ls = 240–270 is uniformly larger by a factor of ∼2 than that in Ls = 90–120 in the southern hemisphere, while they are comparable in the northern hemisphere. This fact demonstrates that the eddy diffusion coefficient is variable with season and latitude.
dc.languageeng
dc.titleVariations in Vertical CO/CO2 Profiles in the Martian Mesosphere and Lower Thermosphere Measured by the ExoMars TGO/NOMAD: Implications of Variations in Eddy Diffusion Coefficient
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeMars
dc.subject.freeeddy diffusion coefficient
dc.subject.freeatmospheric composition
dc.subject.freemesosphere
dc.subject.freespectroscopy
dc.subject.freeretrieval
dc.source.titleGeophysical Research Letters
dc.source.volume49
dc.source.issue10
dc.source.pagee2022GL098485
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/2022GL098485
dc.identifier.scopus


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