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

Akiho Miyamoto, Hiromu Nakagawa, Takeshi Kuroda, Kosuke Takami, Isao Murata, Alexander S. Medvedev, Nao Yoshida, Shohei Aoki, Hideo Sagawa, Yasumasa Kasaba, Naoki Terada

研究成果: Article査読

抄録

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.

本文言語English
論文番号e2021GL092413
ジャーナルGeophysical Research Letters
48
11
DOI
出版ステータスPublished - 2021 6 16

ASJC Scopus subject areas

  • 地球物理学
  • 地球惑星科学(全般)

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