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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/gmd-2019-341
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-341
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: development and technical paper 28 Jan 2020

Submitted as: development and technical paper | 28 Jan 2020

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This preprint is currently under review for the journal GMD.

Multi-grid algorithm for passive tracer transport in NEMO ocean circulation model: a case study with NEMO OGCM (version 3.6)

Clément Bricaud1, Julien Le Sommer2, Madec Gurvan3, Christophe Calone2, Julie Deshayes3, Christian Ethe3, Jérôme Chanut4, and Marina Levy3 Clément Bricaud et al.
  • 1Mercator Ocean International, 31520 Ramonville-Saint-Agne, France
  • 2Univ. Grenoble Alpes, CNRS, IRD, G-INP, IGE, 38000 Grenoble, France
  • 3Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN), IPSL, Sorbonne Université, Paris, 75005, France
  • 4Mercator Ocean International, 31520 Ramonville-Saint-Agne, France

Abstract. Ocean biogeochemical models are key tools for both scientific and operational applications. Nevertheless the cost of running these models is often expensive because of the large number of biogeochemical tracers. This has motivated the development of multi-grid approaches where ocean dynamics and tracer transport are computed on grids of different spatial resolution. However, existing multi-grid approaches to tracer transport in ocean modelling do not allow to compute ocean dynamics and tracer transport simultaneously. This paper describes a new multi-grid approach developed for accelerating the computation of passive tracer transport in the NEMO ocean circulation model. In practice, passive tracer transport is computed at runtime on a grid with coarser spatial resolution than the hydrodynamics, which allows to reduce the CPU cost of computing the evolution of tracer. We describe the multi-grid algorithm, its practical implementation in the NEMO ocean model, and discuss its performance on the basis of a series of sensitivity experiments with global ocean model configurations. Our experiments confirm that the spatial resolution of hydrodynamical fields can be coarsened by a factor 3 in both horizontal directions without significantly affecting the resolved passive tracer fields. Overall, the proposed algorithm yields a reduction by a factor 7 of the overhead associated with running a full biogeochemical model like PISCES (with 24 passive tracers). Propositions for reducing further this cost without affecting the resolved solution are discussed.

Clément Bricaud et al.

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Clément Bricaud et al.

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Model outputs for "Multi-grid algorithm for passive tracer transport in NEMO ocean circulation model" Clément Bricaud https://doi.org/10.5281/zenodo.3547421

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Code, scripts and input files for "Multi-grid algorithm for passive tracer transport in NEMO ocean circulation model: a case study with NEMO OGCM (version 3.6)" paper. Clément Bricaud https://doi.org/10.5281/zenodo.3615356

Clément Bricaud et al.

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Latest update: 28 Feb 2020
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Short summary
In order to reduce the cost of Ocean biogeochemical models, a multi-grid approach where ocean dynamics and tracer transport are computed with different spatial resolution has been developed in NEMO 3.6 OGCM. Different experiments confirm that the spatial resolution of hydro-dynamical fields can be coarsened without significantly affecting the resolved passive tracer fields. This approach leads to a reduction by a factor 7 of the overhead associated with running a full biogeochemical model.
In order to reduce the cost of Ocean biogeochemical models, a multi-grid approach where ocean...
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