Physics – Fluid Dynamics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dyato..25..233y&link_type=abstract
Dyn. Atmos. Oceans, Vol. 25, No. 4, p. 233 - 272
Physics
Fluid Dynamics
Earth Atmosphere: Fluid Dynamics, Jupiter Atmosphere: Fluid Dynamics
Scientific paper
The linear dynamics of the unstably stratified geophysical flows is investigated with a two-layer formulation. A 'convective' deformation radius classifies the dynamics into three regimes: (1) scales smaller than the deformation radius: the dynamics characterized by unstable inertial-gravity modes; (2) scales larger than the deformation radius: a quasi-geostrophic regime; and (3) scales close to the deformation radius, where the dynamics transits from the inertial-gravity regime to the quasi-geostrophic regime. The Rossby wave can propagate eastward in the unstably stratified quasi-geostrophic regime. The baroclinic instabilities are basically realized as a larger-scale extent of the inertial-gravity instabilities, but the former can be isolated from the latter in a limit of small β-effect, with a very deep lower layer. The results suggest that the convectively unstable Jovian atmospheric dynamics can be well described as a quasi-geostrophic system.
Sommeria Joel
Yano Jun-Ichi
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