Abstract: The role of the Kelvin wave, discovered by Hirota (1978), in producing the westerly accelerations of the semiannual zonal wind oscillation in the tropical upper stratosphere is examined quantitatively. It is shown that, ...

Abstract: Using a simplified, approximate ?Lagrangian-mean? dynamical formulation, the mean meridional mass circulation of the stratosphere and mesosphere is discussed. Under solstice conditions, it is shown that this Lagrangian-mean ...

Abstract: Internal gravity waves, and the stress divergence and turbulence induced by them, are essential components of the atmospheric and oceanic general circulations. Theoretical studies have not yet reached a consensus as to how ...

Abstract: The dynamical state of the stratosphere influenced by radiative heating, with no internal sources or sinks of angular momentum, is examined. It is shown that there exists a nonlinear Hadley regime driven by antisymmetric ...

Abstract: Instabilities arising on a latitudinally sheared mean flow fall into one of at least two classes: inertial instabilities associated with a reversed potential vorticity and barotropic instabilities associated with a reversed ...

Abstract: The quasi-biennial oscillation is simulated in two dimensions using a WKB approach for the equatorial waves in which analytic approximations to the wave-induced body forces are inserted as forcing terms in a primitive ...

Abstract: Advection of angular momentum by the mean meridional circulation is important in the quasi-biennial and semiannual oscillations of the tropical middle atmosphere. The advection is nonlinear, implying a finite horizontal ...

Abstract: A simple theoretical model was developed to investigate the inertial instability of zonally nonuniform, non-parallel flow near the equator. The basic state was independent of height and time but included cross-equatorial ...

Abstract: Rawinsonde data from tropical Pacific stations were examined for westward-propagating 3?6-day meridional wind oscillations in the troposphere and lower stratosphere, 1973?1992. Four types were identified from cross- spectrum ...

Abstract: The decelerating effect of enhanced upper tropospheric wavedriving (DF) in winter and early spring induces a ?reverse? component of the residual mean meridional circulation in the polar lower stratosphere opposite to that ...