Two-way nesting in split-explicit ocean models: Algorithms, implementation and validation

Laurent Debreu; Patrick Marchesiello; Pierrick Penven; Gildas Cambon

hal-00690731, version 1

Two-way nesting in split-explicit ocean models: Algorithms, implementation and validation

Laurent Debreu ¹, Patrick Marchesiello ², Pierrick Penven ^3, 4, Gildas Cambon ⁵

Ocean Modelling 49-50 (2012) 1-21

Abstract: A full two-way nesting approach for split-explicit, free surface ocean models is presented. It is novel in three main respects: the treatment of grid refinement at the fast mode (barotropic) level; the use of scale selective update schemes; the conservation of both volume and tracer contents via refluxing. An idealized application to vortex propagation on a β plane shows agreement between nested and high resolution solutions. A realistic application to the California Current System then confirm these results in a complex configuration. The selected algorithm is now part of ROMS_AGRIF. It is fully consistent with ROMS parallel capabilities on both shared and distributed memory architectures. The nesting implementation authorizes several nesting levels and several grids at any particular level. This operational capability, combined with the inner qualities of our two-way nesting algorithm and generally high-order accuracy of ROMS numerics, allow for realistic simulation of coastal and ocean dynamics at multiple, interacting scales.

1: MOISE (INRIA Grenoble Rhône-Alpes / LJK Laboratoire Jean Kuntzmann)
CNRS : UMR5224 – INRIA – Laboratoire Jean Kuntzmann – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
2: Laboratoire d'Etudes en Géophysique et Océanographie Spatiales (LEGOS)
Institut de recherche pour le développement [IRD] – CNRS : UMR065
3: Department of Oceanography
University of Cape Town
4: Laboratoire de physique des océans (LPO)
CNRS : UMR6523 – Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) – INSU – Université de Bretagne Occidentale [UBO] – Institut de recherche pour le développement [IRD] – Institut Universitaire Européen de la Mer (IUEM)
5: Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS)
CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III

hal-00690731, version 1
http://hal.archives-ouvertes.fr/hal-00690731
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From: Francoise Cudennec <>
Submitted on: Tuesday, 24 April 2012 11:57:15
Updated on: Tuesday, 24 April 2012 11:57:15

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DOI: 10.1016/j.ocemod.2012.03.003

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%% hal-00690731, version 1
%% http://hal.archives-ouvertes.fr/hal-00690731
@article{debreu:hal-00690731,
    hal_id = {hal-00690731},
    url = {http://hal.archives-ouvertes.fr/hal-00690731},
    title = {{Two-way nesting in split-explicit ocean models: Algorithms, implementation and validation}},
    author = {Debreu, Laurent and Marchesiello, Patrick and Penven, Pierrick and Cambon, Gildas},
    abstract = {{A full two-way nesting approach for split-explicit, free surface ocean models is presented. It is novel in three main respects: the treatment of grid refinement at the fast mode (barotropic) level; the use of scale selective update schemes; the conservation of both volume and tracer contents via refluxing. An idealized application to vortex propagation on a $\beta$ plane shows agreement between nested and high resolution solutions. A realistic application to the California Current System then confirm these results in a complex configuration. The selected algorithm is now part of ROMS\_AGRIF. It is fully consistent with ROMS parallel capabilities on both shared and distributed memory architectures. The nesting implementation authorizes several nesting levels and several grids at any particular level. This operational capability, combined with the inner qualities of our two-way nesting algorithm and generally high-order accuracy of ROMS numerics, allow for realistic simulation of coastal and ocean dynamics at multiple, interacting scales.}},
    keywords = {Two-way nesting ; Finite difference method ; Modeling ; Boundary conditions ; Coastal upwelling},
    language = {English},
    affiliation = {MOISE - INRIA Grenoble Rh{\^o}ne-Alpes / LJK Laboratoire Jean Kuntzmann , Laboratoire d'Etudes en G{\'e}ophysique et Oc{\'e}anographie Spatiales - LEGOS , Department of Oceanography , Laboratoire de physique des oc{\'e}ans - LPO , Laboratoire d'{\'e}tudes en G{\'e}ophysique et oc{\'e}anographie spatiales - LEGOS},
    pages = {1-21},
    journal = {Ocean Modelling},
    volume = {49-50},
    audience = {international },
    doi = {10.1016/j.ocemod.2012.03.003 },
    year = {2012},
    month = Jun,
}

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