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    Intense Zonal Wind in the Martian Mesosphere During the 2018 Planet-Encircling Dust Event Observed by Ground-Based Infrared Heterodyne Spectroscopy

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    Authors
    Miyamoto, A.
    Nakagawa, H.
    Kuroda, T.
    Takami, K.
    Murata, I.
    Medvedev, A.S.
    Yoshida, N.
    Aoki, S.
    Sagawa, H.
    Kasaba, Y.
    Terada, N.
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    Discipline
    Physical sciences
    Subject
    atmosphere
    dust storm
    dynamics
    infrared observation
    Mars
    spectroscopy
    Audience
    Scientific
    Date
    2021
    Metadata
    Show full item record
    Description
    We report on the direct measurements of zonal winds around 80 km altitude during the 2018 planet-encircling dust event (PEDE) by infrared (IR) heterodyne spectroscopy. The observed Doppler shifts assume intense retrograde (easterly) winds (208 ± 17 m s−1, 159 ± 20 m s−1, 211 ± 20 m s−1 on June 21, June 27, August 31, 2018, respectively) in the equatorial region during the 2018 PEDE. This is significantly stronger than those during non-storm conditions reported by the previous study (Sonnabend et al., 2012, https://doi.org/10.1016/j.icarus.2011.11.009). The substantial retrograde wind during the PEDE is qualitatively consistent with the predictions by the Mars general circulation models (MGCMs), however, the observed wind on 31, August, are of a larger magnitude. We evaluated the mechanism of acceleration using the output from a high-resolution MGCM. We find out that the stronger winds are related to strengthening the meridional circulation across the equator and forcing by gravity waves.
    Citation
    Miyamoto, A.; Nakagawa, H.; Kuroda, T.; Takami, K.; Murata, I.; Medvedev, A.S.; Yoshida, N.; Aoki, S.; Sagawa, H.; Kasaba, Y.; Terada, N. (2021). Intense Zonal Wind in the Martian Mesosphere During the 2018 Planet-Encircling Dust Event Observed by Ground-Based Infrared Heterodyne Spectroscopy. , Geophysical Research Letters, Vol. 48, Issue 11, e2021GL092413, DOI: 10.1029/2021GL092413.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7875
    doi: http://dx.doi.org/10.1029/2021GL092413
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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