Quasi-Periodic Variation of the Lower Equatorial Cloud Induced by Atmospheric Waves on Venus

Hiroki Ando, Masahiro Takagi, Hideo Sagawa, Norihiko Sugimoto, Miho Sekiguchi, Yoshihisa Matsuda

研究成果: Article査読

抄録

A quasi-periodic variation of the lower cloud amount induced by atmospheric waves was reproduced in our Venus general circulation model for the first time. This result agrees well with previous 2.3-μm infrared nightside measurements. The cloud amount variation is mainly caused by a temperature fluctuation with a period of ∼5.5 Earth days near the cloud base, which is associated with a Kelvin-like gravity wave with a zonal wavenumber-1 structure. Our result might be able to explain the mechanism of the periodical variation of the brightness in the Venusian low-latitudes shown by the previous 2.3-μm infrared nightside measurements. It is also suggested that the temporal variation of the mass loading due to the temperature fluctuation is related to the abrupt appearance and disappearance of the large cloud particle (Mode 3) and explains the sharp discontinuity of the lower cloud found by the recent Akatsuki and ground-based infrared nightside measurements.

本文言語English
論文番号e2020JE006781
ジャーナルJournal of Geophysical Research: Planets
126
6
DOI
出版ステータスPublished - 2021 6

ASJC Scopus subject areas

  • 地球化学および岩石学
  • 地球物理学
  • 地球惑星科学(その他)
  • 宇宙惑星科学

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