Waves in a Venus general circulation model

Norihiko Sugimoto, Masahiro Takagi, Yoshihisa Matsuda

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Waves in the Venus atmosphere are numerically investigated by extending a work of Sugimoto et al. (2014). Fast superrotating zonal flow of 120 m s-1 at the equator is reproduced and maintained by solar heating for more than 10 Earth years. The meridional distribution of the obtained fast zonal flow is quite consistent with observations at the cloud levels. In the cloud layer, baroclinic waves develop continuously with a life cycle of ~25 Earth days at midlatitudes, using available potential energy derived from a baroclinically unstable basic state. Rossby waves observed at the cloud top are generated by the baroclinic waves and induce spatio-temporal variation of the superrotation with amplitude larger than 25 m s-1. Further, Kelvin waves with a period of ∼ 6.2 days appear in the equatorial region below ~50 km. Momentum and heat transports produced by these waves are discussed. Key Points Realistic Venus superrotating flow is reproduced self-consistently in the GCMSo-called Rossby waves on Venus are generated by the baroclinic wavesObserved variations of the superrotation are caused by the baroclinic waves

Original languageEnglish
Pages (from-to)7461-7467
Number of pages7
JournalGeophysical Research Letters
Volume41
Issue number21
DOIs
Publication statusPublished - 2014 Nov 16

Keywords

  • GCM
  • Venus atmosphere
  • superrotation
  • waves

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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