Planetary circulations. III - The terrestrial quasi-geostrophic regime

Physics

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Atmospheric Circulation, Geostrophic Wind, Planetary Atmospheres, Aerodynamic Drag, Coriolis Effect, Graphs (Charts), Heat Flux, Hemispheres, Jupiter Atmosphere

Scientific paper

The characteristics of the two-level quasi-geostrophic model are evaluated for a wide range of parameters in the terrestrial domain. Flow form is determined primarily by the Coriolis gradient and by the time scale of the surface drag, acting through the influence of Rhines' transitional wavenumber. Two extreme types of circulation occur: jets when this wavenumber is large, and gyres when wave propagation and drag are negligible. The present terrestrial circulation, in its quasi-geostrophic representation, is extremely efficient: the system can cope with increased heating rates without a significant rise in the pole-to-equator temperature differential. Although each hemisphere is, on occasion, near to transforming into a double-jet state, multi-jet circulations - corresponding to those in the Jovian regime - occur more readily at higher rotation rates. For the existing circulation to switch to a gyre form requires a large, unrealizable drop in surface drag.

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