In simple GCMs, the time scale associated with the persistence of one particular phase of the modelâ€™s leading mode of variability can often be unrealistically large. In a particularly extreme example, the time scale in the Polvaniâ€“Kushner model is about an order of magnitude larger than the observed atmosphere. From the fluctuationâ€“dissipation theorem, oneâ€¦ (More)

We investigate the dynamics of zonal jets in a semi-hemisphere zonally-reentrant ocean model. The forcings imposed in the model are an idealized atmospheric wind stress and relaxation to a latitudinal temperature profile held constant in time. While there are striking similarities to the observed atmospheric annular modes, where the leading mode ofâ€¦ (More)