Abstract: The mean meridional circulation induced by zonal momentum forcing is considered in the context of (i) a wave?mean model, in which the momentum forcing arises naturally from the explicit representation of the stratospheric ...

Abstract: An investigation is made of steady-state and vacillating regimes, in an idealized numerical model of the winter stratosphere, to improve understanding of possible mechanisms for variability in the real stratosphere. ...

Abstract: A simple mechanistic model, with time-independent planetary wave forcing at the lower boundary, is used to investigate the observed differences between the Northern Hemisphere (NH) and Southern Hemisphere (SH) stratospheric ...

Abstract: This paper considers the propagation of waves on the edge of a stratospheric polar vortex, represented by a three-dimensional patch of uniform potential vorticity in a compressible quasigeostrophic system. Waves are ...

Abstract: Although possibly the simplest model for the atmospheres of the giant planets, the turbulent forced-dissipative shallow-water system in spherical geometry has not, to date, been investigated; the present study aims to fill ...

Abstract: This paper examines the nature and robustness of internal stratospheric variability, namely the variability resulting from the internal dynamics of the stratosphere itself, as opposed to that forced by external sources ...

Abstract: This paper examines the interaction of oppositely signed vortices in the compressible (non-Boussinesq) quasigeostrophic system, with a view to understanding vortex interactions in the polar winter stratosphere. A series ...

Abstract: This paper discusses Rossby wave breaking on the isentropic surfaces that intersect the subtropical tropopause, using winds and isentropic potential vorticity from high-resolution meteorological analysis. The focus is both ...

Abstract: The excitation of Rossby waves on the edge of the stratospheric polar vortex, due to time-dependent topographic forcing, is studied analytically and numerically in a simple quasigeostrophic f-plane model. When the atmosphere ...

Abstract: This paper considers the effect of time-dependent lower boundary wave forcing on the internal variability found to appear spontaneously in a stratosphere-only model when the forcing is perfectly steady. While the time-dependent ...