Abstract: Further numerical and analytical solutions are obtained for unstable disturbances in a two-layer, hydrostatic, quasi-geostrophic model with both vertical and meridional shear in the basic zonal wind, the meridional shear ...

Abstract: No abstract available.

Abstract: A stability analysis has been performed for an easterly lower tropospheric jet which approximates the observed flow over West Africa during summer. The most unstable disturbance has a growth rate of 0.27 day?1, a wavelength ...

Abstract: A study is made of the computational stability of semi-implicit treatments of gravity wave motion suitable for use with two-time-level advection schemes. The analysis is for horizontally uniform reference values of temperature ...

Abstract: Integrations of spectral models are presented in which the ?Gaussian? grid of points at which the nonlinear terms are evaluated is reduced as the poles are approached. A maximum saving in excess of one-third the number of ...

Abstract: The growth rate, phase speed, structure and transfer properties of normal modes of the primitive and quasi-geostrophic equations have been determined by applying an initial value technique to global nonlinear atmospheric ...

Abstract: An energy and angular-momentum conserving vertical finite-difference scheme is introduced for a general terrain-following vertical coordinate which is a function of pressure and its surface value. A corresponding semi-implicit ...

Abstract: No abstract.

Abstract: Baroclinic instability calculations published by Gall are repeated using the model developed by the authors for use in their own stability studies. Results indicate that some of the differences in the wavelength of maximum ...

Abstract: The authors' previous study of baroclinic instability using a primitive equation model with spherical geometry is extended to include more realistic initial distributions of zonal wind and temperature in the upper troposphere ...