In this memo we (Pierre Bénard and Karim Yessad) choose, among several possible methods, one practical method for implementing
in Aladin the LESIDG functionality, that is, the possibility of using a SI scheme with a non-uniform version of the
linearized map-factor. The algorithms for the chosen (...)
This general introduction and description of the SLHD was written by Filip Vana in March 2006. It contains also simple
user’s guide. For advanced readers there is a tutorial for an individual
This article by Filip Vana (written in February 2005) explains the new fashion of the spectral horizontal diffusion tuning.
It has been implemented to the model cycle CY29T1. Since that time no
HDIR[x] coefficients are accepted by code. There is also no need any longer
to recompute horizontal (...)
This is a provisionnal version on 19 September 2005 : please send any comments to Pierre Bénard (you can use the forum linked to this article).
This paper derives the equations for a moist precipitating atmosphere in mass coordinate. The starting point is the paper by Sylvie Malardel on the (...)
This is a provisionnal version written in June 2005 : please send any comments to Sylvie Malardel of Jean-François Geleyn (you can use the forum linked to this article).
Initialy, the hydrostatic equations used in the NWP model ARPEGE/ALADIN where designed for a synoptic scale forecasting (...)
This is a provisionnal version, working document : please send any comments to Sylvie Malardel, Jean-François Geleyn or Pierre Bénard (you can use the forum linked to this article).
In the paper, the authors (Sylvie Malardel, Jean-François Geleyn and Pierre Bénard) consider a multiphase system of (...)
This paper written be Pierre Bénard in December 2004 is a working document, which can serve as a starting basis for discussions between ECMWF and Météo-France about the extension of the current IFS Vertical Finite Elements (VFE) scheme to NH modelling.
The current VFE discretisation introduced in (...)
This document written by Pierre Bénard summarizes the principles for implementing an horizontal diffusion in a stretched model and lists the problems encountered in the development and validation of HDF scheme, and its current status. One of the goals is to have a written material in order to (...)
Two documents present the new transform library from cycle23 : a document from Mats Hamrud (June 2002) decribes the new transform library in ARPEGE/IFS: as from cycle 23r4, the spectral transforms have been broken out of the IFS to form a separate library, the source residing in its own VOB. (...)
Document in French published by Pierre Bénard on 9 June 2000.
Ce court document s’adresse a ceux qui veulent comprendre d’une manière simple: ce qu’est l’hydrostatisme ce qu’est le non-hydrostatisme pourquoi et comment cela peut etre important quel rapport cela a avec la prévision (...)