Planetary-scale streak structure reproduced in high-resolution simulations of the Venus atmosphere with a low-stability layer

Hiroki Kashimura, Norihiko Sugimoto, Masahiro Takagi, Yoshihisa Matsuda, Wataru Ohfuchi, Takeshi Enomoto, Kensuke Nakajima, Masaki Ishiwatari, Takao M. Sato, George L. Hashimoto, Takehiko Satoh, Yoshiyuki O. Takahashi, Yoshi Yuki Hayashi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Cloud patterns are important clues for revealing the atmospheric circulation of Venus. Recently, a planetary-scale streak structure has been discovered in middle- and lower-cloud images of Venus’ night-side taken by IR2, the 2-μm camera, on board the Akatsuki orbiter. However, its formation mechanism has not been investigated. Here we succeed, for the first time, in reproducing the patterns of the observed streak structure, as regions of strong downward flows that develop in high-resolution global simulations of the Venus atmosphere. The streaks are formed in both hemispheres with equatorial symmetry, which is caused by equatorial Rossby-like and Kelvin-like waves with zonal wavenumber one. The low-stability layer that has been suggested by past observations is essential for reproducing the streak structure. The streaks of downward flow result from the interaction of the meridionally tilted phase lines of the Rossby-like waves and the characteristics of baroclinic instability produced around the low-stability layer.

Original languageEnglish
Article number23
JournalNature Communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

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Venus
Venus atmosphere
Venus (planet)
Atmosphere
baroclinic instability
Kelvin waves
atmospheric circulation
high resolution
hemispheres
planetary waves
night
simulation
cameras
symmetry
Cameras
interactions

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Planetary-scale streak structure reproduced in high-resolution simulations of the Venus atmosphere with a low-stability layer. / Kashimura, Hiroki; Sugimoto, Norihiko; Takagi, Masahiro; Matsuda, Yoshihisa; Ohfuchi, Wataru; Enomoto, Takeshi; Nakajima, Kensuke; Ishiwatari, Masaki; Sato, Takao M.; Hashimoto, George L.; Satoh, Takehiko; Takahashi, Yoshiyuki O.; Hayashi, Yoshi Yuki.

In: Nature Communications, Vol. 10, No. 1, 23, 01.12.2019.

Research output: Contribution to journalArticle

Kashimura, H, Sugimoto, N, Takagi, M, Matsuda, Y, Ohfuchi, W, Enomoto, T, Nakajima, K, Ishiwatari, M, Sato, TM, Hashimoto, GL, Satoh, T, Takahashi, YO & Hayashi, YY 2019, 'Planetary-scale streak structure reproduced in high-resolution simulations of the Venus atmosphere with a low-stability layer', Nature Communications, vol. 10, no. 1, 23. https://doi.org/10.1038/s41467-018-07919-y
Kashimura, Hiroki ; Sugimoto, Norihiko ; Takagi, Masahiro ; Matsuda, Yoshihisa ; Ohfuchi, Wataru ; Enomoto, Takeshi ; Nakajima, Kensuke ; Ishiwatari, Masaki ; Sato, Takao M. ; Hashimoto, George L. ; Satoh, Takehiko ; Takahashi, Yoshiyuki O. ; Hayashi, Yoshi Yuki. / Planetary-scale streak structure reproduced in high-resolution simulations of the Venus atmosphere with a low-stability layer. In: Nature Communications. 2019 ; Vol. 10, No. 1.
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