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- Title
CICE on a C-grid: new momentum, stress, and transport schemes for CICEv6.5.
- Authors
Lemieux, Jean-François; Lipscomb, William H.; Craig, Anthony; Bailey, David A.; Hunke, Elizabeth; Blain, Philippe; Rasmussen, Till A. S.; Bentsen, Mats; Dupont, Frédéric; Hebert, David; Allard, Richard
- Abstract
This article presents the C-grid implementation of the CICE sea ice model, including the C-grid discretization of the momentum equation, the boundary conditions, and the modifications to the code required to use the incremental remapping transport scheme. To validate the new C-grid implementation, many numerical experiments were conducted and compared to the B-grid solutions. In idealized experiments, the standard advection method (incremental remapping with C-grid velocities interpolated to the cell corners) leads to a checkerboard pattern. A modal analysis demonstrates that this computational noise originates from the spatial averaging of C-grid velocities at corners. The checkerboard pattern can be eliminated by adjusting the departure regions to match the divergence obtained from the solution of the momentum equation. We refer to this approach as the edge flux adjustment method. The C-grid discretization with edge flux adjustment allows transport in channels that are one grid cell wide--a capability that is not possible with the B-grid discretization nor with the C-grid and standard remapping advection. Simulation results match the predicted values of a novel analytical solution for one-grid-cell-wide channels.
- Subjects
MODAL analysis; SEA ice; GRID cells; ICE navigation; ADVECTION; ANALYTICAL solutions
- Publication
Geoscientific Model Development Discussions, 2024, p1
- ISSN
1991-9611
- Publication type
Article
- DOI
10.5194/gmd-2023-239