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Pre-processing of ZTD observations from GPS stations (Nov 2007) (Observations)

Thursday 8 November 2007 by Paul Poli
The present French documentation (from Paul Poli) describes the pre-processing of zenith total delays (ZTD) observations from ground-based GPS stations. This pre-processing requires in input: GPS ZTD observations as well as a GPS station selection list. The pre-processing as presented here is (...)


ODB items used to store GPSRO information in IFS CY32 (June 2007) (Observations)

Tuesday 5 June 2007 by Paul Poli
The present documentation (by Paul Poli) lists the ODB items used to store GPS radio occultation (GPSRO) information in the IFS CY32 system at Météo-France.


Variational diagnotic analysis (2006) (Variational)

Thursday 9 March 2006 by Ludovic Auger
A variational diagnostic analysis tool has been developed for diagnostic purposes. This tool will be the successor of "diagpack" for nowcasting issues. It is inspired by the concept of diagnostic analysis which has been the central concept for the development of diagpack. From the technical (...)


Preliminary experiments towards the pre-operational ALADIN 3DVar (2005) (Variational)

Thursday 24 February 2005
This report was published by Thibaut Montmerle, Claude Fisher and Loïk Berre on February 2005. It presents the aim, strategy and first results for the implementation of an operational variational data assimilation systelm in the ALADIN/France model. Starting from the experience gathered over (...)


Optimal interpolation : CANARI (2002) (CANARI)

December 2002
CANARI est the acronym of : Code d’Analyse Nécessaire à Arpege pour ses Rejets et son Initialisation Code for the Analysis Necessary for Arpege for its Rejects and its Initiamization CANARI is a software which performs an optimum interpolation analysis for any variable of the meteorological (...)


ALADIN documentation / 3DVAR aspects, 2007 updated (Variational)

November 2002
This note gives a detailed description of the algorithmic part, for the benefit of phasing, remote installations and development. A theoretical overview is recalled for completeness with the technical section. A "User’s guide" is added for the general users of 3dvar. Formalism of incremental (...)


Blending of initial fields in ALADIN (2001) (Analysis and assimilation)

March 2001
This document of March 2001 is a tentative synthesis of previous contributions. In dynamical adaptation mode, the initial conditions for ALADIN short-range forecasts are simply interpolated from those of the coupling model (ARPEGE hereafter). Whatever the quality of the interpolation method (...)


4D-VAR script documentation (2002, in French) (Variational)

July 2002
This 4D-Var documentation was written in July 2002 by Gérald Desroziers et Pascale Riber. It is in French. Guide d’utilisation Installation du script Définition et lancement d’une expérience Formalisme général Assimilation 4D-Var Assimilation 3D-Var FGAT Structure du script Arbre des appels (...)


2000 - Realization of a simplified, differentiable and realistic physical parametrization for incremental four-dimensional variational data assimilation (Variational)

June 2000
A complete set of the simplified physical parametrizations has been developed for incremental 4D-Var assimilation system. It contains a simplified computation of radiative fluxes, vertical turbulent diffusion, orographic gravity waves, deep convection and stratiform precipitation fluxes. The (...)


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