atmosphere; dust storm; dynamics; infrared observation; Mars; spectroscopy; Direct measurement; Dust event; Equatorial regions; Ground based; Heterodyne spectroscopy; High resolution; Mars general circulation model; Meridional circulation; Geophysics; Earth and Planetary Sciences (all); General Earth and Planetary Sciences
Abstract :
[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Miyamoto, Akiho ; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Nakagawa, Hiromu ; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Kuroda, Takeshi ; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Takami, Kosuke; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Murata, Isao; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Medvedev, Alexander S. ; Max Planck Institute for Solar System Research, Göttingen, Germany
Yoshida, Nao ; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Aoki, Shohei ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Brussels, Belgium
Sagawa, Hideo; Faculty of Science, Kyoto Sangyo University, Kyoto, Japan
Kasaba, Yasumasa ; Planetary Plasma and Atmospheric Research Center, Graduate School of Sciences, Tohoku University, Sendai, Japan
Terada, Naoki ; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
Language :
English
Title :
Intense Zonal Wind in the Martian Mesosphere During the 2018 Planet-Encircling Dust Event Observed by Ground-Based Infrared Heterodyne Spectroscopy
This work was supported by the Grant-in-Aid for Scientific Research (A) 19H00707, (B) 15H05209, (C) JP19K03943, JP19K03980, and JP20K04046 from JSPS, and Grant-in-Aid for Scientific Research on Innovative Areas for No. 20H04605 from JSPS. This work was carried out by the joint research program of the Institute for Space-Earth Environmental Research, Nagoya University. S. Aoki is “Chargé de Recherches” of the F.R.S.-FNRS.This work was supported by the Grant‐in‐Aid for Scientific Research (A) 19H00707, (B) 15H05209, (C) JP19K03943, JP19K03980, and JP20K04046 from JSPS, and Grant‐in‐Aid for Scientific Research on Innovative Areas for No. 20H04605 from JSPS. This work was carried out by the joint research program of the Institute for Space‐Earth Environmental Research, Nagoya University. S. Aoki is “Chargé de Recherches” of the F.R.S.‐FNRS.
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