Abstract: The nondivergent barotropic vorticity equation is integrated numerically in order to investigate a potential resonance mechanism for Rossby waves on a shear flow in the presence of a nonlinear critical layer. lie numerical ...

Abstract: Scale-dependent phase errors are characteristic of Eulerian advection schemes and can lead to significant erroneous dispersion, especially for features whose length scales are near the resolution limits of a numerical ...

Abstract: There are several reasons why it is desirable to eliminate the interpolation associated with the conventional semi-Larangian scheme. Interpolation leads to smoothing and is also the most costly operation associated with ...

Abstract: The treatment of advection is related to the stability, accuracy and efficiency of models used in numerical weather prediction. In order to remain stable, conventional Eulerian advection schemes must respect a Courant-Fr ...

Abstract: Previous tests with grid-point numerical weather prediction models have shown that semi-Lagrangian schemes permit the use of time steps that are much larger than those permitted by the Courant-Friedrichs-Lewy (CFL) stability ...

Abstract: No abstract available.

Abstract: This study examines the extensions that have been made to a basic semi-Lagrangian semi-implicit multilevel spectral primitive equation model in preparing it for use as an operational data assimilation and medium-range ...

Abstract: It has been demonstrated previously by both analysis and numerical integration that there is a serious problem incorporating orographic forcing into semi-implicit semi-Lagrangian models, since spurious resonance can develop ...

Abstract: Slow-start procedures were developed decades ago in order to provide a smoother evolution in numerical simulations performed with three-time-level integration schemes. The advantages of a slow start versus a conventional ...

Abstract: A complete multilevel atmospheric model of the primitive meteorological equations is integrated at high spatial resolution with a large time step of 90 min. Numerical stability is achieved by associating a semi-Lagrangian ...