TY - JOUR
T1 - Intense Zonal Wind in the Martian Mesosphere During the 2018 Planet-Encircling Dust Event Observed by Ground-Based Infrared Heterodyne Spectroscopy
AU - Miyamoto, Akiho
AU - Nakagawa, Hiromu
AU - Kuroda, Takeshi
AU - Takami, Kosuke
AU - Murata, Isao
AU - Medvedev, Alexander S.
AU - Yoshida, Nao
AU - Aoki, Shohei
AU - Sagawa, Hideo
AU - Kasaba, Yasumasa
AU - Terada, Naoki
N1 - Funding Information:
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.
Funding Information:
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.
Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.
PY - 2021/6/16
Y1 - 2021/6/16
N2 - 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.
AB - 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.
KW - Mars
KW - atmosphere
KW - dust storm
KW - dynamics
KW - infrared observation
KW - spectroscopy
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U2 - 10.1029/2021GL092413
DO - 10.1029/2021GL092413
M3 - Article
AN - SCOPUS:85107540303
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 11
M1 - e2021GL092413
ER -