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

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–back...

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Bibliographic Details
Main Authors: Banerjee, Tridib, Scholz, Patrick, Danilov, Sergey, Klingbeil, Knut, Sidorenko, Dimitry
Format: Text
Language:English
Published: 2024
Subjects:
Sea ice
Online Access:https://doi.org/10.5194/gmd-2023-208
https://gmd.copernicus.org/preprints/gmd-2023-208/
Description
Summary: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.

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