Dynamics
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Published on 12 February 2019
by Karim Yessad
by Karim Yessad
Abstract:
ARPEGE/IFS, ALADIN and AROME are spectral models, so this documentation has for purpose to describe the spectral transforms done. The present note has for aim to give a brief summary of the spectral method (how to compute Legendre polynomials, spectral transforms) and to describe (...)
Published on 12 February 2019
by Karim Yessad
by Karim Yessad
Abstract:
This documentation recalls some basics about horizontal diffusion schemes, and describes how they are implemented in ARPEGE/IFS and its LAM (limited area model) counterpart. The ECMWF way of implementing them (which is slightly different from the METEO-FRANCE one) is not described in (...)
Published on 12 February 2019
by Karim Yessad
by Karim Yessad
Abstract:
This documentation can be seen as a long introduction to modeling. The general purpose of this documentation is to describe the set of equations used, and also the way to integrate the dynamics of the model. Two points will be examined in detail in this documentation: the Eulerian (...)
Published on 12 February 2019
by Karim Yessad
by Karim Yessad
Abstract:
The general purpose of this documentation is to describe the set of equations used, and also the way to integrate the dynamics of the model with the semi-Lagrangian method currently implemented in ARPEGE/IFS. The following points will be described: semi-Lagrangian formulation and (...)
Published on 12 February 2019
by Karim Yessad
by Karim Yessad
Abstract:
This documentation describes two types of schemes allowing to stabilize the numerical discretizations of the models: the semi-implicit scheme and the iterative centred-implicit scheme (sometimes called predictor-corrector scheme). An algorithmic description to different types of (...)