Are geostrophic and quasi-geostrophic approximations valid in Venus' differential super-rotation?

Masaru Yamamoto, Hiroshi Tanaka

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

Geostrophic dynamics in the horizontally differential super-rotation of Venus are examined using fA (the Coriolis parameter defined by the angular velocity of a basic flow in an inertial frame) and Γ (the differential rotation parameter defined by the latitudinal gradient of the angular velocity) under the conditions that vertical shear of the basic field is not considered and the intrinsic phase velocity has a magnitude comparable to that of an eddy horizontal flow. The geostrophic and quasi-geostrophic approximations are valid in the regions of weakly differential and rigid-body super-rotations; however, they are invalid in the regions of strongly differential super-rotation even when the Rossby number RO is sufficiently smaller than unity for synoptic eddies. In a general circulation model of a Venus-like atmosphere, the horizontal divergence that results from the strong differential cannot be ignored over a wide range within latitudes ±60° and below 60 km elevation because of large Γ/fA(≥1/2).

本文言語英語
ページ(範囲)185-195
ページ数11
ジャーナルGeophysical and Astrophysical Fluid Dynamics
100
3
DOI
出版ステータス出版済み - 6 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Astronomy and Astrophysics
  • Geophysics
  • Mechanics of Materials
  • Geochemistry and Petrology

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