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For an efficient assimilation of OPERA radar data, Feb. 2020 (Observations)

Friday 14 February 2020 by Patricia
This document describes the choices made at Météo France in order to efficiently assimilate OPERA radar data, using the metadata and the quality flags existing in the files available on the OIFS (OPERA Internet File System).


EPYGRAM tool (February 2020) (Files and data)

Monday 10 February 2020 by Patricia
The epygram library package is a set of Python classes and functions designed to handle meteorological fields in Python, as well as interfacing their storage in various usual (or not) data formats. The purpose of the library is to provide user-friendly interfaces to formats of data resources (...)


Turbulence diagnostic (Eddy Dissipation Rate), ARPEGE cy43, January 2020 (Diagnostics)

Friday 10 January 2020 by Patricia
A new global turbulence forecast product for aeronautics Aeronautical turbulence is a major risk for this sector with dozen of millions of dollars for companies, and more than 7000 hours of sick leaves. Turbulence suffered by planes has multiple sources such as CAT (Clear Air Turbulence) which (...)


Diagnostics by Horizontal Domains : DDH (2019) (Diagnostics)

Tuesday 1 October 2019
Guide for users and developpers : Variables and budget equations, in horizontal mean ARPEGE, ALADIN and AROME models, new documentation available on October 1, 2019. The documentation presents the diagnostics on horizontal domains (DDH) developed initially for the variable mesh of ARPEGE, (...)


Eradication of arrays bounds violations in IFS/ARPEGE/AROME, August 2019 (Technical and coding aspects)

Thursday 26 September 2019 by Patricia
In this note, Ryad explains the origins of the arrays bounds violations issue and proposes a solution to eradicate them. This solution has been implemented in the code (CY47T0).


BATOR’s Changes and input files used (Observations)

Friday 17 May 2019 by Frank Guillaume

1/ Since CY42 some changes have been made in BATOR :

  • ’ficdate’ file which describe timeslots is deprecated.
  • ’refdata’ files are replaced by ’batormap’ ones

2/ How to write a param_bator.cfg input file (from CY43)

3/ namelist entities used as input in Bator

4/ how Bator does read OPERA radar files



Cycling in the IFS-ARPEGE-AROME code: a GIT view, April 2019 (Coding, phasing, porting)

Wednesday 17 April 2019 by Patricia
The diagram prepared by Alexandre Mary illustrates the evolution of cycles in the common code IFS-ARPEGE-AROME in the GIT repository of Meteo-France. Main features to remember: all the main cycles (e.g. CY43T2, CY46) are tags on the master branch. a T cycle (e.g. CY47T1) is constructed as a (...)


CFU (cumulated fluxes) and XFU (instantaneous fluxes) in the cycle 46t1r1 of ARPEGE/IFS. (Diagnostics)

Tuesday 12 February 2019 by Karim Yessad
Sommaire Abstract RESUME Contents This documentation describes some diagnostics done on the physical fluxes: CFU (cumulated fluxes) and XFU (instantaneous fluxes). Some algorithmic aspects and technical aspects (organigramme for example) are described. CETTE (...)


Digital filtering initialisation in the cycle 46t1r1 of ARPEGE/IFS. (Dynamics)

Tuesday 12 February 2019 by Karim Yessad
Sommaire Abstract RESUME Contents This documentation describes the digital filtering initialisation (DFI) and its implementation in ARPEGE/IFS. Some theoretical aspects are recalled. The way of implementing the DFI in ARPEGE/IFS is then described, and an (...)


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

Tuesday 12 February 2019 by Karim Yessad
Sommaire Abstract RESUME Contents 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 (...)


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