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    Explanation for the Increase in High‐Altitude Water on Mars Observed by NOMAD During the 2018 Global Dust Storm

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    Authors
    Neary, L.
    Daerden, F.
    Aoki, S.
    Whiteway, J.
    Clancy, R.T.
    Smith, M.
    Viscardy, S.
    Erwin, J.T.
    Thomas, I.R.
    Villanueva, G.
    Liuzzi, G.
    Crismani, M.
    Wolff, M.
    Lewis, S.R.
    Holmes, J.A.
    Patel, M.R.
    Giuranna, M.
    Depiesse, C.
    Piccialli, A.
    Robert, S.
    Trompet, L.
    Willame, Y.
    Ristic, B.
    Vandaele, A.C.
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    Discipline
    Physical sciences
    Subject
    Mars
    dust storm
    Mars Year 34
    GCM modeling
    hydrogen escape
    Audience
    Scientific
    Date
    2020
    Metadata
    Show full item record
    Description
    The Nadir and Occultation for MArs Discovery (NOMAD) instrument on board ExoMars Trace Gas Orbiter measured a large increase in water vapor at altitudes in the range of 40–100 km during the 2018 global dust storm on Mars. Using a three‐dimensional general circulation model, we examine the mechanism responsible for the enhancement of water vapor in the upper atmosphere. Experiments with different prescribed vertical profiles of dust show that when more dust is present higher in the atmosphere, the temperature increases, and the amount of water ascending over the tropics is not limited by saturation until reaching heights of 70–100 km. The warmer temperatures allow more water to ascend to the mesosphere. Photochemical simulations show a strong increase in high‐altitude atomic hydrogen following the high‐altitude water vapor increase by a few days.
    Citation
    Neary, L.; Daerden, F.; Aoki, S.; Whiteway, J.; Clancy, R.T.; Smith, M.; Viscardy, S.; Erwin, J.T.; Thomas, I.R.; Villanueva, G.; Liuzzi, G.; Crismani, M.; Wolff, M.; Lewis, S.R.; Holmes, J.A.; Patel, M.R.; Giuranna, M.; Depiesse, C.; Piccialli, A.; Robert, S.; Trompet, L.; Willame, Y.; Ristic, B.; Vandaele, A.C. (2020). Explanation for the Increase in High‐Altitude Water on Mars Observed by NOMAD During the 2018 Global Dust Storm. , Geophysical Research Letters, Vol. 47, Issue 7, e2019GL084354, DOI: 10.1029/2019GL084354.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7499
    doi: http://dx.doi.org/10.1029/2019GL084354
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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