Wave propagation and growth on a surface front in a two-layer geostrophic current.

Studies small amplitude perturbations of a geostrophically balanced semi-infinite layer of light water having a surface front and lying above a heavier layer of finite vertical thickness which is at rest in the mean. Finds that the equilibrium is always unstable regardless of the distribution of potential vorticity, and the maximum growth rates are generally much larger than in the 'one-layer' case.-from Authors