Superrotation and equatorial waves in a T21 Venus-like AGCM

Masaru Yamamoto, Masaaki Takahashi

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Superrotation of more than 100 m s-1 is formed at the cloud top (65-70 km) in a T21 Venus-like atmospheric general circulation model (Venus-like AGCM) driven by a zonal-mean thermal forcing. This is maintained by the Gierasch mechanism, in which meridional circulation efficiently pumps up angular momentum and various waves produce equatorward eddy momentum fluxes. In addition to the above mechanism, fast equatorial waves with a wide frequency range (including a famous 4-day wave) enhance the cloud-top superrotation, since the downward angular momentum flux of vertically propagating gravity waves is canceled by the upward flux of the fast equatorial waves.

Original languageEnglish
JournalGeophysical Research Letters
Volume30
Issue number9
DOIs
Publication statusPublished - May 1 2003
Externally publishedYes

Fingerprint

superrotation
Atmospheric General Circulation Models
equatorial wave
Venus (planet)
atmospheric general circulation model
Venus
angular momentum
meridional circulation
gravity wave
momentum
pump
eddy
gravity waves
frequency ranges
vortices
pumps

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Superrotation and equatorial waves in a T21 Venus-like AGCM. / Yamamoto, Masaru; Takahashi, Masaaki.

In: Geophysical Research Letters, Vol. 30, No. 9, 01.05.2003.

Research output: Contribution to journalArticle

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