Abstract: A variational principle is presented for periodic, finite-amplitude gravity waves in terms of a stream-function.

Abstract: A recent analysis of atmospheric observations has shown evidence of bimodality in the statistical distribution of wave amplitude in the ultralong (zonal wavenumber group 2?4), low frequency (period >5 days). Similar analysis ...

Abstract: The response of a simple quasi-unidimensional barotropic model is studied. Wave-wave interaction, and bending the linear resonant response to the topographic forcing allows multiple equilibria if the zonal mean flow is ...

Abstract: The authors search the stationary solutions of the barotropic vorticity equation in spherical coordinates by numerically solving the equations with the Newton?Keller pseudoarclength continuation method. The solutions consist ...

Abstract: In a preceding paper the authors showed that planetary waves of very different amplitudes can be sustained on the same configuration of the zonal wind by asymptotically balancing the energy contributions related to Ekman ...