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Rotating Nonlinear Vortical Patterns on a Gamma Plane

Authors


Address for correspondence: Oleg G. Derzho, Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, NL, A1B 3X7 Canada; e-mail: oderzho@mun.ca

Abstract

Nonlinear barotropic vortical patterns on a γ-plane are investigated analytically. The solutions describe large-scale Rossby waves rotating anticyclonically with zero circulation. The Rossby waves are predicted to rotate with a specific angular velocity. The stream function–vorticity relation is assumed to be nonlinear, which may lead to a pronounced asymmetry within the pattern. The similarity between the simulated patterns and the Antarctic Circumpolar Wave is highlighted.

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