KelvinWave and Its Impact on the Venus Atmosphere Tested by Observing System Simulation Experiment

Norihiko Sugimoto, Yukiko Fujisawa, Mimo Shirasaka, Mirai Abe, Shinya Murakami, Toru Kouyama, Hiroki Ando, Masahiro Takagi, Masaru Yamamoto

Research output: Contribution to journalArticlepeer-review

Abstract

At the cloud top of the Venus atmosphere, equatorial Kelvin waves have been observed and are considered to play an important role in the super-rotation. We were able to reproduce the wave in a general circulation model (GCM) by conducting an observing system simulation experiment (OSSE) with the help of a data assimilation system. The synthetic horizontal winds of the Kelvin wave produced by the linear wave propagating model are assimilated at the cloud top (~70 km) in realistic conditions, assuming they are obtained from cloud tracking of ultra-violet images (UVI) taken by the Venus orbiters. It is demonstrated using Eliassen–Palm (EP) fluxes that the reproduced Kelvin wave transports angular momentum and plays an important role in the magnitude and structure of the super-rotation, causing the acceleration and deceleration of zonal wind of ~0.1 m/s day−1. The conditions required in order to reproduce the Kelvin wave have also been investigated. It is desirable to have 24 hourly dayside satellite observations in an equatorial orbit, such as the Akatsuki Venus climate orbiter. The results of this type of data assimilation study will be useful in the planning of future observation missions to the atmospheres of planets.

Original languageEnglish
Article number182
JournalAtmosphere
Volume13
Issue number2
DOIs
Publication statusPublished - 2022 Feb

Keywords

  • Data assimilation
  • Kelvin wave
  • Momentum transport
  • Super-rotation
  • Venus atmosphere

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)

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