Over-reflection of barotropic Rossby wave packet

Interference of stationary and traveling waves of sufficiently large amplitude can cause vacillations in the instantaneous EP-flux and its divergence. Such fluctuations may provide an explanation for some of the vacillations in transport and in the mean flow observed in the stratosphere. While there has been a focus on a simple two-component system, in reality several spectral components are likely to be present. For sufficiently large mean flow deceleration, the local wave field and the quasi-linear description developed here would presumably break down.