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

Tuesday 12 February 2019 by Karim Yessad
Table of contents 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 (...)


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

Tuesday 12 February 2019 by Karim Yessad
Table of contents 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, (...)


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

Tuesday 12 February 2019 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 (...)


Semi-Lagrangian computations in the cycle 46t1r1 of ARPEGE/IFS. (Dynamics)

Tuesday 12 February 2019 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 (...)


Integration of the model equations, and eulerian dynamics, in the cycle 46t1r1 of ARPEGE/IFS. (Dynamics)

Tuesday 12 February 2019 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 (...)


Horizontal diffusion computations in cycle 46t1r1 of ARPEGE/IFS. (Dynamics)

Tuesday 12 February 2019 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 (...)


Spectral transforms in the cycle 46t1r1 of ARPEGE/IFS. (Dynamics)

Tuesday 12 February 2019 by Karim Yessad
Table of contents Abstract RESUME Contents Appendices ARPEGE/IFS, ALADIN and AROME 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 (...)


Basics about ARPEGE/IFS, ALADIN and AROME in the cycle 46t1r1 of ARPEGE/IFS. (Configurations)

Tuesday 12 February 2019 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 (...)


Distributed memory features in the cycle 46t1r1 of ARPEGE/IFS. (Technical and coding aspects)

Tuesday 12 February 2019 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 (...)


Minimizations in the cycle 46t1r1 of ARPEGE/IFS. (Technical and coding aspects)

Tuesday 12 February 2019 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. (...)


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