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Use of the 2D structure of GOM-arrays for the assimilation of radar reflectivities in the AROME model at MÃ©tÃ©o-France, April 2012

2012-12-13T10:42:00Z

Use of the 2D structure of GOM-arrays for the assimilation of
radar reflectivities in the AROME model at MÃ©tÃ©o-France by Eric Wattrelot : A 1D method to get relative humidity retrievals from
radar reflectivities : why and how ? Dataflow of the 2D-GOM and specific points linked to
radar assimilation
– > data assimilation

- Variational

Variational diagnotic analysis (2006)

Ludovic Auger — 2006-03-09T14:36:14Z

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 point of view, it is based on the ALADIN 3dvar analysis that enables to have a complete analysis of both altitude and screen-level fields.
Moreover, flowing the ALADIN 3dvar logic is a major advantage (…)

- Variational

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

2005-02-24T00:00:00Z

This report was published by Thibaut Montmerle, Claude Fisher and LoÃ¯k 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 the last five years with 3D-VAR in ALADIN as a research configuration, the goal is to settle a continuous, permanent assimilation cycle with an initial update fraquency of 6 hours.
A discussion (…)

- Variational

ALADIN documentation / 3DVAR aspects, 2007 updated

2002-11-01T00:00:00Z

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 variational analysis 3dvar Background error covariance matrix B Preconditioning 4dvar Data flow and code organisation Screening 3dvar minimisation 4dvar minimisation User's guide : scripts and (…)

- Variational

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

2002-07-01T00:00:00Z

This 4D-Var documentation was written in July 2002 by GÃ©rald Desroziers et Pascale Riber. It is in French. Guide d'utilisation Installation du script DÃ©finition et lancement d'une expÃ©rience Formalisme gÃ©nÃ©ral Assimilation 4D-Var Assimilation 3D-Var FGAT Structure du script Arbre des appels Algorithmique de la minimisation Namelists Les principales variables du script RÃ©sultats d'une expÃ©rience

- Variational

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

2000-06-01T10:31:00Z

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 validation of the whole direct simplified physical package has been done.
To include the described simplified physical parametrizations into assimilating model, their tangent linear and adjoint have (…)

- Variational