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Generation of gravity waves from thermal tides in the Venus atmosphere

Author

Listed:
  • Norihiko Sugimoto

    (Keio University
    Keio University)

  • Yukiko Fujisawa

    (Keio University)

  • Hiroki Kashimura

    (Kobe University
    Kobe University)

  • Katsuyuki Noguchi

    (Nara Women’s University)

  • Takeshi Kuroda

    (Tohoku University)

  • Masahiro Takagi

    (Kyoto Sangyo University)

  • Yoshi-Yuki Hayashi

    (Kobe University
    Kobe University)

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.

Suggested Citation

  • Norihiko Sugimoto & Yukiko Fujisawa & Hiroki Kashimura & Katsuyuki Noguchi & Takeshi Kuroda & Masahiro Takagi & Yoshi-Yuki Hayashi, 2021. "Generation of gravity waves from thermal tides in the Venus atmosphere," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24002-1
    DOI: 10.1038/s41467-021-24002-1
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