Rossby solitons - Stability, collisions, asymmetry, and generation by flows with a velocity shear

Details Rossby solitons - Stability, collisions, asymmetry, and generation by flows with a velocity shear Rossby solitons - Stability, collisions, asymmetry, and generation by flows with a velocity shear

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983zhetf..84.1357a&link_type=abstract

Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki (ISSN 0044-4510), vol. 84, April 1983, p. 1357-1372. In Russian.

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12

Drift Rate, Planetary Atmospheres, Rossby Regimes, Rotating Fluids, Solitary Waves, Vortices, Anticyclones, Asymmetry, Cyclones, Flow Visualization, Jupiter Red Spot

Scientific paper

The major properties of Rossby solitons in a rotating shallow fluid of constant depth are investigated. It is shown that of all geostrophic vortices with proper rotation frequencies less than the rotation frequency of the system, only the Rossby solitons are stable, while the other vortices are rapidly transformed into zonal flows. The drift velocity of Rossby solitons increases with their amplitude, and the collisions of Rossby solitons of the various amplitudes are of an inelastic nature: at a sufficiently high velocity of approach the vortices merge into one Rossby soliton whose lifetime is determined by the viscosity of the medium. Rossby solitons are observed only in the form of solitary anticyclones (solitary fluid elevations). Opposite currents in this geometry exhibit instabilities, in which the nonlinear regime of this instability is characterized by a pronounced asymmetry. The probable connection between this observed asymmetry and the nature of the vortex in the Red Spot of Jupiter is examined.

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