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RISDesign of a Dynamical Core Based on the Nonhydrostatic “Unified System” of Equations
Publisher: American Meteorological Society
Abstract: his paper presents the design of a dry dynamical core based on the nonhydrostatic ?unified system? of equations. The unified system filters vertically propagating acoustic waves. The dynamical core predicts the potential ...
Design of an Atmospheric Model Based on a Generalized Vertical Coordinate
Publisher: American Meteorological Society
Abstract: Although there are important advantages in the use of an isentropic vertical coordinate in atmospheric models, it requires overcoming computational difficulties associated with intersections of coordinate surfaces with the ...
Vertical Differencing of the Primitive Equations Based on the Charney–Phillips Grid in Hybrid &sigma–p Vertical Coordinates
Publisher: American Meteorological Society
Abstract: Two types of vertical grids are used for atmospheric models: the Lorenz grid (L grid) and the Charney?Phillips grid (CP grid). Although the CP grid is the standard grid for quasigenstrophic models, it is not widely used ...
Multipoint Explicit Differencing (MED) for Time Integrations of the Wave Equation
Publisher: American Meteorological Society
Abstract: For time integrations of the wave equation, it is desirable to use a scheme that is stable over a wide range of the Courant number. Implicit schemes are examples of such schemes, but they do that job at the expense of ...
Unification of the Anelastic and Quasi-Hydrostatic Systems of Equations
Publisher: American Meteorological Society
Abstract: A system of equations is presented that unifies the nonhydrostatic anelastic system and the quasi-hydrostatic compressible system for use in global cloud-resolving models. By using a properly defined quasi-hydrostatic ...
Choice of a Vertical Grid in Incorporating Condensation Heating into an Isentropic Vertical Coordinate Model
Publisher: American Meteorological Society
Abstract: Advantages of using an isentropic vertical coordinate in atmospheric models are well recognized. In particular, the use of an isentropic coordinate virtually eliminates discretization errors for vertical advection since ...
Optimized Icosahedral Grids: Performance of Finite-Difference Operators and Multigrid Solver
Publisher: American Meteorological Society
Abstract: his paper discusses the generation of icosahedral hexagonal?pentagonal grids, optimization of the grids, how optimization affects the accuracy of finite-difference Laplacian, Jacobian, and divergence operators, and a ...
A Study of the Stratospheric Major Warming and Subsequent Flow Recovery during the Winter of 1979 with an Isentropic Vertical Coordinate Model
Publisher: American Meteorological Society
Abstract: The principal goal of this paper is to gain further insight into the dynamical processes during the stratospheric major warming of February and early March 1979, with a special emphasis on the recovery stage. To achieve ...
Modeling Rossby Wave Breaking in the Southern Spring Stratosphere
Publisher: American Meteorological Society
Abstract: ossby wave breaking (RWB) plays a central role in the evolution of stratospheric flows. The generation and evolution of RWB is examined in the simple dynamical framework of a one-layer shallow-water system on a sphere. The ...
Parameterization of PBL Processes in an Atmospheric General Circulation Model: Description and Preliminary Assessment
Publisher: American Meteorological Society
Abstract: This paper presents the basic features of a newly developed planetary boundary layer (PBL) parameterization, and the performance assessment of a version of the University of California, Los Angeles (UCLA), Atmospheric ...