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RISOn the Use of a Wider Class of Linear Systems for the Design of Constant-Coefficients Semi-Implicit Time Schemes in NWP
Publisher: American Meteorological Society
Abstract: The linearization of the meteorological equations around a specified reference state, usually applied in NWP to define the linear system of constant-coefficients semi-implicit schemes, is outlined as an unnecessarily ...
On the Discretization of the Continuity Equation in Semi-Lagrangian Models with a Pressure-Type Vertical Coordinate
Publisher: American Meteorological Society
Abstract: This note presents an alternative way to perform discretization of the column-integrated continuity equation in pressure-type vertical coordinate semi-Lagrangian models. The properties of this alternative form have not yet ...
Well-Posed Lateral Boundary Conditions for Spectral Semi-Implicit Semi-Lagrangian Schemes: Tests in a One-Dimensional Model
Publisher: American Meteorological Society
Abstract: The aim of this paper is to investigate the feasibility of well-posed lateral boundary conditions in a Fourier spectral semi-implicit semi-Lagrangian one-dimensional model. Two aspects are analyzed: (i) the complication ...
Stability of Leapfrog Constant-Coefficients Semi-Implicit Schemes for the Fully Elastic System of Euler Equations: Case with Orography
Publisher: American Meteorological Society
Abstract: The stability of constant-coefficients semi-implicit schemes for the hydrostatic primitive equations and the fully elastic Euler equations in the presence of explicitly treated thermal residuals has been theoretically ...
Nonhydrostatic Simulation of Frontogenesis in a Moist Atmosphere. Part II: Moist Potential Vorticity Budget and Wide Rainbands
Publisher: American Meteorological Society
Abstract: The different processes responsible for the occurrence of wide rainbands, as obtained by high-resolution (5-km) nonhydrostatic two-dimensional simulations of frontogenesis induced by shear, with an explicit representation ...
Nonhydrostatic Simulation of Frontogenesis in a Moist Atmosphere. Part I: General Description and Narrow Rainbands
Publisher: American Meteorological Society
Abstract: A series of experiments using a two-dimensional, nonhydrostatic, numerical cloud model with fine horizontal and vertical resolution is performed with the Hoskins-Bretherton solution to the Eady problem as initial condition. ...
Stabilization of Nonlinear Vertical Diffusion Schemes in the Context of NWP Models
Publisher: American Meteorological Society
Abstract: The stability of the nonlinear vertical diffusion equation such as commonly used for parameterizing the turbulence in NWP models is examined. As a starting point, this paper adopts the idea of Girard and Delage and shows ...
Stability of Leapfrog Constant-Coefficients Semi-Implicit Schemes for the Fully Elastic System of Euler Equations: Flat-Terrain Case
Publisher: American Meteorological Society
Abstract: The stability of semi-implicit schemes for the hydrostatic primitive equations system has been studied extensively over the past 20 yr, since this temporal scheme and this system represented a standard for NWP. However, ...
The AROME-France Convective-Scale Operational Model
Publisher: American Meteorological Society
Abstract: After six years of scientific, technical developments and meteorological validation, the Application of Research to Operations at Mesoscale (AROME-France) convective-scale model became operational at Météo-France at the ...