On the existence of nonzonal flows satisfying sufficient conditions for stability

Physics – Fluid Dynamics

Scientific paper

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Scientific paper

It is shown that flows satisfying Blumen's (1968) quasigeostrophic, baroclinic generalisation of Arnol'd's (1965) sufficient condition for stability must be zonally-symmetric if the boundary conditions are zonally-symmetric. A similar restriction applies to the criteria established by Benzi et al. (1982) for equivalent-barotropic flow. An example is given of a topographically-forced nonzonal flow satisfying Blumen's sufficient conditions for stability; at large distances from the topographic centre this becomes purely zonal and westward. It is demonstrated that all flows satisfying the Arnol'd's-Blumen criteria are pseudo-westward" in the sense that the potential vorticity increases to the right of the geostrophic velocity.

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