FINITE-AMPLITUDE BAROCLINIC WAVES

Abstract

A theory is presented for the finite-amplitude behavior of unstable baroclinic waves in a quasi-geostrophic two- layer model. It is shown that in the absence of dissipation the equilibrated finite- amplitude state exhibists an oscillation, both of the mean flow and the baroclinic wave. On the other hand, if sufficient dissipation is present, the final state is a wave whose amplitude is steady and the approach to that state is nonoscillatory.