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How waves and turbulence maintain the super-rotation of Venus' atmosphere

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Title: How waves and turbulence maintain the super-rotation of Venus' atmosphere
Authors: Horinouchi, Takeshi Browse this author →KAKEN DB
Hayashi, Yoshi-Yuki Browse this author →KAKEN DB
Watanabe, Shigeto Browse this author →KAKEN DB
Yamada, Manabu Browse this author →KAKEN DB
Yamazaki, Atsushi Browse this author →KAKEN DB
Kouyama, Toru Browse this author →KAKEN DB
Taguchi, Makoto Browse this author →KAKEN DB
Fukuhara, Tetsuya Browse this author →KAKEN DB
Takagi, Masahiro Browse this author →KAKEN DB
Ogohara, Kazunori Browse this author →KAKEN DB
Murakami, Shin-ya Browse this author
Peralta, Javier Browse this author
Limaye, Sanjay S. Browse this author
Imamura, Takeshi Browse this author →KAKEN DB
Nakamura, Masato Browse this author →KAKEN DB
Sato, Takao M. Browse this author
Satoh, Takehiko Browse this author →KAKEN DB
Issue Date: 24-Apr-2020
Publisher: The American Association for the Advancement of Science(AAAS)
Journal Title: Science
Volume: 368
Issue: 6489
Start Page: 405
End Page: 409
Publisher DOI: 10.1126/science.aaz4439
Abstract: Venus has a thick atmosphere that rotates 60 times as fast as the surface, a phenomenon known as superrotation. We use data obtained from the orbiting Akatsuki spacecraft to investigate how the super-rotation is maintained in the cloud layer, where the rotation speed is highest. A thermally induced latitudinal-vertical circulation acts to homogenize the distribution of the angular momentum around the rotational axis. Maintaining the super-rotation requires this to be counteracted by atmospheric waves and turbulence. Among those effects, thermal tides transport the angular momentum, which maintains the rotation peak, near the cloud top at low latitudes. Other planetary-scale waves and large-scale turbulence act in the opposite direction. We suggest that hydrodynamic instabilities adjust the angular-momentum distribution at mid-latitudes.
Rights: This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science, vol.368 on 24 Apr 2020, DOI: 10.1126/science.aaz4439
Type: article (author version)
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 堀之内 武

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