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Spectral transforms in the cycle 46t1r1 of ARPEGE/IFS.

Published on 12 February 2019
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 (…)

Horizontal diffusion computations in cycle 46t1r1 of ARPEGE/IFS.

Published on 12 February 2019
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 (…)

Integration of the model equations, and eulerian dynamics, in the cycle 46t1r1 of ARPEGE/IFS.

Published on 12 February 2019
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 (…)

Semi-Lagrangian computations in the cycle 46t1r1 of ARPEGE/IFS.

Published on 12 February 2019
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 (…)

Semi-Implicit spectral computations and predictor-corrector schemes in the cycle 46t1r1 of ARPEGE/IFS.

Published on 12 February 2019
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 (…)