Abstract: A simple two-dimensional linear stability analysis is presented to study the characteristics of the scale selection and structure of baroclinic cyclogenesis. Effects of a realistic vertical thermal structure of the environment ...

Abstract: An analytic model is formulated to study the characteristics of shear instabilities in meridionally and vertically sheared flows. The model is based on the quasigeostrophic equations in two layers. The layers are divided ...

Abstract: A number of idealized life-cycle simulations of baroclinically unstable waves are systematically analyzed to study the effects of eddy momentum flux and of zonal mean horizontal shear on the finite-amplitude evolution of ...

Abstract: An exact, two-dimensional (height?latitude type) diagnostic model of tracer transport in the stratosphere is formulated. The model is a generalization of the area analysis method devised by Butchart and Remsberg but uses ...

Abstract: Equilibration of two-dimensional Eady waves is numerically investigated using the geostrophic momentum equations incorporating heat and momentum diffusion. Extended solutions are obtained beyond what would be the collapse ...

Abstract: Two-dimensional mixing of a tracer is diagnosed using A, the area between the tracer contour and a reference contour, as the horizontal coordinate. In the absence of sources or sinks, the tracer distribution in the area ...

Abstract: Effects of isolated transport barriers on the global mixing and fluxes of a tracer are investigated, where a barrier is defined as a local minimum in effective diffusivity. An idealized 1D model with a prescribed diffusivity ...

Abstract: It is shown that the Eulerian-mean advection?diffusion equation for a passive tracer, q, can be cast, uniquely and exactly into where the bar denotes an arbitrary Eulerian average (spatial, temporal, or both), v* is a ...

Abstract: Effective diffusivity calculated from a scalar field that obeys the advection?diffusion equation has proved useful for estimating the permeability of unsteady boundaries of air masses such as the edge of the stratospheric ...

Abstract: Baroclinic adjustment hypothesis fails to account for the enhancement of the barotropic jet observed in idealized baroclinic-wave life-cycle simulations. In this paper, an adjustment theory more consistent with the numerical ...