| 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) |
| URI: | http://hdl.handle.net/2115/78661 |
| 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)
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