We determine stationary states and examine dynamic mergers of isolated piecewise constant regions of potential vorticity in a two-layer quasigeostrophic model. We focus on the behavior of the critical initial separation distance for merger, d c , as a function of γ -1 (inverse Rossby radius) and δ , the ration of layer depths.
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Polvani et al. (1988) studied this question.
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