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Specific documentation


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The purpose of this site is to give an easy access to the numerous and various documentations available around ARPEGE/ALADIN/AROME

  • specific documentation (grouped by topics)
  • specific presentations and full lectures given during training courses
  • other presentations (grouped by topics)
  • Newsletters
  • Some targered articles for Newcomers to ALADIN or New Phasers.

The home page of this site presents the last articles and news item published (in reverse chronological order). Many tools (on top and bottom menus) should made your reading easier :

"Site Map" : overview of all articles "Summary" : calendar of articles publication "Contact" : send a message to the administrator
the possibility of syndication for each section, sub-section, article
the "Search" engine based on a word indexing system : it is available in the header of all pages and it searches in sections or sub-sections, articles and also in the contents of the joined documents (.pdf, .ps, ...)

Most recent articles


Most recent articles


Sphere to sphere transforms in spectral space in the cycle 45 of ARPEGE/IFS: configuration 911.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents This documentation describes configuration formerly numbered 911 which performs dilatation/contraction matrices: these matrices allow to do spectral transformation between a stretched spectral space and between its (...)


Trajectory management in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents In ARPEGE/IFS, some applications (for example a 4DVAR minimisation) use a tangent linear code and an adjoint code. Such codes require to compute a trajectory, this trajectory is computed by running the direct code. (...)


Minimizations in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents This documentation describes the minimizations done in ARPEGE/IFS, for example in the 3DVAR and 4DVAR assimilation. First some algorithmic aspects are recalled about minimizers and solving of linear algebra systems. (...)


Distributed memory features in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents This documentation describes some aspects of the memory distribution for parallel environment (message passing). It is written as a complement of some other documentations (mainly the ECMWF documentation) so some (...)


Basics about ARPEGE/IFS, ALADIN and AROME in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents This documentation has the aim to give a general overview of the ARPEGE/IFS, ALADIN and AROME models, for beginners or for someone which knows some specific points but has no general overview of the whole models. It (...)


Spectral transforms in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents Appendices ARPEGE/IFS and ALADIN are spectral models, so this documentation has for purpose to describe the spectral transforms done. The present note has for aim to give a brief summary of the spectral method (how (...)


Horizontal diffusion computations in cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents This documentation recalls some basics about horizontal diffusion schemes, and describes how they are implemented in ARPEGE/IFS and its LAM (limited area model) counterpart. The ECMWF way of implementing them (which (...)


Integration of the model equations, and eulerian dynamics, in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents Appendices This documentation can be seen as a long introduction to modeling. The general purpose of this documentation is to describe the set of equations used, and also the way to integrate the dynamics of the (...)


Semi-Lagrangian computations in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents Abstract RESUME Contents The general purpose of this documentation is to describe the set of equations used, and also the way to integrate the dynamics of the model with the semi-Lagrangian method currently implemented in ARPEGE/IFS. The (...)


Semi-Implicit spectral computations and predictor-corrector schemes in the cycle 45 of ARPEGE/IFS.

Thursday 29 June 2017 by Karim Yessad
Table of contents 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 (...)

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