Preprints
https://doi.org/10.5194/gmd-2023-239
https://doi.org/10.5194/gmd-2023-239
Submitted as: model description paper
 | 
25 Jan 2024
Submitted as: model description paper |  | 25 Jan 2024
Status: a revised version of this preprint is currently under review for the journal GMD.

CICE on a C-grid: new momentum, stress, and transport schemes for CICEv6.5

Jean-Francois Lemieux, William Lipscomb, Anthony Craig, David A. Bailey, Elizabeth Hunke, Philippe Blain, Till A. S. Rasmussen, Mats Bentsen, Frederic Dupont, David Hebert, and Richard Allard

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.

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Jean-Francois Lemieux, William Lipscomb, Anthony Craig, David A. Bailey, Elizabeth Hunke, Philippe Blain, Till A. S. Rasmussen, Mats Bentsen, Frederic Dupont, David Hebert, and Richard Allard

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-2023-239', Anonymous Referee #1, 14 Mar 2024
  • RC2: 'Comment on gmd-2023-239', Anonymous Referee #2, 03 Apr 2024
  • AC1: 'Comment on gmd-2023-239', J.-F. Lemieux, 02 May 2024
Jean-Francois Lemieux, William Lipscomb, Anthony Craig, David A. Bailey, Elizabeth Hunke, Philippe Blain, Till A. S. Rasmussen, Mats Bentsen, Frederic Dupont, David Hebert, and Richard Allard

Model code and software

CICE version 6.5.0 E. Hunke et al. https://github.com/CICE-Consortium/CICE/releases/tag/CICE6.5.0

Jean-Francois Lemieux, William Lipscomb, Anthony Craig, David A. Bailey, Elizabeth Hunke, Philippe Blain, Till A. S. Rasmussen, Mats Bentsen, Frederic Dupont, David Hebert, and Richard Allard

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Short summary
We present the latest version of the CICE model. CICE solves equations that describe the dynamics and the growth/melt of sea ice. To do so, the domain is divided in grid cells and the variables are positioned at specific locations in the cells. A new implementation (C-grid) is presented with the velocity located on cell edges. Compared to the previous B-grid, the C-grid allows a natural coupling with some oceanic and atmospheric models. It also allows the transport of ice in narrow channels.