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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2018-329
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-329
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model evaluation paper 04 Feb 2019

Model evaluation paper | 04 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Assessment of the Finite VolumE Sea Ice Ocean Model (FESOM2.0), Part I: Description of selected key model elements and comparison to its predecessor version

Patrick Scholz1, Dmitry Sidorenko1, Ozgur Gurses1, Sergey Danilov1,2, Nikolay Koldunov1,3, Qiang Wang1, Dmitry Sein1, Margarita Smolentseva1, Natalja Rakowsky1, and Thomas Jung1,4 Patrick Scholz et al.
  • 1Alfred Wegener Institute Helmholtz Center for Polar and Marine Research (AWI), Bremerhaven, Germany
  • 2Jacobs University Bremen, Department of Mathematics & Logistics, Bremen, Germany
  • 3MARUM-Center for Marine Environmental Sciences, Bremen, Germany
  • 4University of Bremen, Department of Physics and Electrical Engineering, Bremen, Germany

Abstract. The evaluation and model element description of the second version of the unstructured-mesh Finite-volumE Sea ice–Ocean circulation Model (FESOM2.0) is presented. The model sensitivity to arbitrary Lagrangian Eulerian (ALE) linear and nonlinear free surface formulation, Gent McWilliams eddy parameterisation, isoneutral Redi diffusion and different vertical mixing schemes is documented. The hydrographic biases, large scale circulation, numerical performance and scalability of FESOM2.0 are compared with its predecessor FESOM1.4. FESOM2.0 shows biases with a magnitude comparable to FESOM1.4 and it simulates a more realistic AMOC. Compared to its predecessor FESOM2.0 provides clearly defined fluxes and a three times higher throughput in terms of simulated years per day (SYPD). It is thus the first mature global unstructured-mesh ocean model with computational efficiency comparable to state-of-the-art structured-mesh ocean models. Other key elements of the model and new development will be described in following-up papers.

Patrick Scholz et al.
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Data sets

FESOM2.0 code P. Scholz, D. Sidorenko, O. Gurses, and S. Danilov https://doi.org/10.5281/zenodo.2348928

Patrick Scholz et al.
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Short summary
This paper is the first in a series documenting and assessing important key components of the Finite-volumE Sea ice–Ocean circulation Model version 2.0 (FESOM2.0). We assess the hydrographic biases, large scale circulation, numerical performance and scalability of FESOM2.0 compared with its predecessor FESOM1.4. The main conclusion is that the results of FESOM2.0 compare well to FESOM1.4 in terms of model biases, but with a remarkable performance speedup with a three times higher throughput.
This paper is the first in a series documenting and assessing important key components of the...
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