Generation of gravity waves from thermal tides in the Venus atmosphere

Norihiko Sugimoto (), Yukiko Fujisawa, Hiroki Kashimura, Katsuyuki Noguchi, Takeshi Kuroda, Masahiro Takagi and Yoshi-Yuki Hayashi
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Norihiko Sugimoto: Keio University
Yukiko Fujisawa: Keio University
Hiroki Kashimura: Kobe University
Katsuyuki Noguchi: Nara Women’s University
Takeshi Kuroda: Tohoku University
Masahiro Takagi: Kyoto Sangyo University
Yoshi-Yuki Hayashi: Kobe University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24002-1

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DOI: 10.1038/s41467-021-24002-1

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