Preprints
https://doi.org/10.5194/gmd-2023-208
https://doi.org/10.5194/gmd-2023-208
Submitted as: development and technical paper
 | 
10 Jan 2024
Submitted as: development and technical paper |  | 10 Jan 2024
Status: a revised version of this preprint is currently under review for the journal GMD.

Split-explicit external mode solver in finite volume sea ice ocean model FESOM2

Tridib Banerjee, Patrick Scholz, Sergey Danilov, Knut Klingbeil, and Dimitry Sidorenko

Abstract. A novel split-explicit (SE) external mode solver for the Finite volumE Sea ice–Ocean Model (FESOM2) and its sub-versions (example 2.5) is presented. It is compared with the semi-implicit (SI) solver currently used in FESOM2. The split-explicit solver utilizes a dissipative asynchronous (forward–backward) time-stepping scheme. Its implementation with Arbitrary Lagrangian-Eulerian vertical coordinates like Z-star (Z ) and Z-tilde (Z˜) is explored. The comparisons are performed through multiple test cases involving idealized and realistic global simulations. The SE solver demonstrates lower phase errors and dissipation, but maintain a simulated mean ocean state very similar to the SI solver. The SE solver is also shown to possess better run-time performance and parallel scalability across all tested workloads.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Tridib Banerjee, Patrick Scholz, Sergey Danilov, Knut Klingbeil, and Dimitry Sidorenko

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2023-208', Mark R. Petersen, 27 Feb 2024
    • AC3: 'Reply on RC1', Tridib Banerjee, 06 Jun 2024
  • CC1: 'Comment on gmd-2023-208', Ange Ishimwe, 29 Feb 2024
    • AC1: 'Reply on CC1', Tridib Banerjee, 01 Mar 2024
      • CC2: 'Reply on AC1', Ange P. Ishimwe, 01 Mar 2024
        • AC2: 'Reply on CC2', Tridib Banerjee, 04 Mar 2024
  • RC2: 'Comment on gmd-2023-208', Anonymous Referee #2, 26 Mar 2024
    • AC4: 'Reply on RC2', Tridib Banerjee, 06 Jun 2024
Tridib Banerjee, Patrick Scholz, Sergey Danilov, Knut Klingbeil, and Dimitry Sidorenko

Model code and software

FESOM2.5 with preliminary Split-Explicit Subcycling Banerjee Tridib, Danilov Sergey, Scholz Patrick, Klingbeil Knut, and Sidorenko Dimitry https://zenodo.org/doi/10.5281/zenodo.10040943

Tridib Banerjee, Patrick Scholz, Sergey Danilov, Knut Klingbeil, and Dimitry Sidorenko

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Short summary
In this paper we propose a new alternative to one of the functionalities of sea-ice model FESOM2. The alternative we propose allows for the model to capture and simulate more accurately fast changes in quantities like sea-surface-elevation. We also demonstrate that the new alternative is faster and is more adept in taking advantages of highly parallelised computing infrastructure. We show that this new alternative can in future became a great addition to the sea-ice model FESOM2.