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User's guide for getting data from BDM (French Data Base of Meteorological data, 2006, in French and English)

Frank Guillaume — 2012-12-19T08:20:00Z

This document mainly deals with : how getting data from the database on SOPRANO system from ARPEGE/ALADIN/AROME cycle 29T2 concrete use of tools such as Oulan (OBSOUL: ASCII files), extraction script of BUFR files, refdata files, ouloutput files, ... A subset of extracted data from BDM (excluding 'conventional' data) is also avalaible in a separate document (for cycle 38). French summary : Ce document décrit, pour l'environnement SOPRANO, le principe général utilisé pour extraire les (...) - Observations

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

2012-12-13T09:42:00Z

Use of the 2D structure of GOM-arrays for the assimilation of radar reflectivities in the AROME model at Météo-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

OBSTAT documention

Paul Poli — 2008-06-04T07:40:00Z

This documentation was written by Paul Poli in April 2006 and is regularly updated since then. Abstract The OBSTAT software computes and plots statistics on observations assimilated in the ECMWF or Meteo France assimilation suite. One common application of OBSTAT is to produce statistics of observation minus background and observation minus analysis quantities. One assimilation time period is sufficient to run OBSTAT, but statistics over several assimilation time periods can be cumulated (...) - Observations

ODB items used to store GPSRO information in IFS CY33 (February 2008)

Paul Poli — 2008-02-20T14:41:04Z

The present documentation (by Paul Poli) lists the ODB items used to store GPS radio occultation (GPSRO) information in the IFS CY33 system at Météo-France. - Observations

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

Paul Poli — 2007-11-08T16:46:00Z

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 applied in the 4DVAR ARPEGE, 3DVAR ALADIN, and 3DVAR AROME assimilation systems. Cette note décrit le pré-traitement des données GPS sol avant leur assimilation dans ARPEGE, ALADIN, et (...) - Observations

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

Paul Poli — 2007-06-05T15:49:12Z

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. - Observations

Variational diagnotic analysis (2006)

Ludovic Auger — 2006-03-09T13:36:14Z

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 in (...) - Variational

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

2005-02-23T23:00:00Z

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 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

Optimal interpolation : CANARI (2002)

2002-11-30T23:00:00Z

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 forecast model ARPEGE/ALADIN. It runs operationally in Meteo-France to initialize the surface variables of the model only since the upperair variables are updated by the 4D-var analysis. A technival (...) - CANARI

ALADIN documentation / 3DVAR aspects, 2007 updated

2002-10-31T23:00:00Z

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 namelists (...) - Variational