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Generation of gravity waves from thermal tides in the Venus atmosphere.
Sugimoto, Norihiko; Fujisawa, Yukiko; Kashimura, Hiroki; Noguchi, Katsuyuki; Kuroda, Takeshi; Takagi, Masahiro; Hayashi, Yoshi-Yuki.
Affiliation
  • Sugimoto N; Department of Physics, Keio University, Yokohama, Japan. nori@phys-h.keio.ac.jp.
  • Fujisawa Y; Research and Education Center for Natural Sciences, Keio University, Yokohama, Japan. nori@phys-h.keio.ac.jp.
  • Kashimura H; Research and Education Center for Natural Sciences, Keio University, Yokohama, Japan.
  • Noguchi K; Department of Planetology, Kobe University, Kobe, Japan.
  • Kuroda T; Center for Planetary Science, Kobe University, Kobe, Japan.
  • Takagi M; Faculty of Science, Nara Women's University, Nara, Japan.
  • Hayashi YY; Department of Geophysics, Tohoku University, Sendai, Japan.
Nat Commun ; 12(1): 3682, 2021 Jun 17.
Article in En | MEDLINE | ID: mdl-34140504
ABSTRACT
Gravity waves play essential roles in the terrestrial atmosphere because they propagate far from source regions and transport momentum and energy globally. Gravity waves are also observed in the Venus atmosphere, but their characteristics have been poorly understood. Here we demonstrate activities of small-scale gravity waves using a high-resolution Venus general circulation model with less than 20 and 0.25 km in the horizontal and vertical grid intervals, respectively. We find spontaneous gravity wave radiation from nearly balanced flows. In the upper cloud layer (~70 km), the thermal tides in the super-rotation are primary sources of small-scale gravity waves in the low-latitudes. Baroclinic/barotropic waves are also essential sources in the mid- and high-latitudes. The small-scale gravity waves affect the three-dimensional structure of the super-rotation and contribute to material mixing through their breaking processes. They propagate vertically and transport momentum globally, which decelerates the super-rotation in the upper cloud layer (~70 km) and accelerates it above ~80 km.

Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Nat Commun Journal subject: BIOLOGIA / CIENCIA Year: 2021 Document type: Article Affiliation country: Japan

Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Nat Commun Journal subject: BIOLOGIA / CIENCIA Year: 2021 Document type: Article Affiliation country: Japan