Submitted as: development and technical paper
04 May 2023
Submitted as: development and technical paper |  | 04 May 2023
Status: this preprint is currently under review for the journal GMD.

CD-type discretization for sea ice dynamics in FESOM version 2

Sergey Danilov, Carolin Mehlmann, Dmitry Sidorenko, and Qiang Wang

Abstract. Two recently proposed variants of CD-type discretizations of sea-ice dynamics on triangular meshes are implemented in the Finite volumE Sea ice – Ocean Model (FESOM version 2). The implementations employ the finite element method in spherical geometry using longitude-latitude coordinates. Both of them rely on the edge-based sea-ice velocity vectors, but differ in basis functions used to represent velocities. The first one uses nonconforming linear (Crouzeix–Raviart) basis functions, and the second one uses continuous linear basis functions on subtriangles obtained by splitting parent triangles into four smaller triangles. Test simulations are used to show how the performance of the new discretizations compares with the A-grid discretization using linear basis functions. Both the CD discretizations are found to simulate a finer structure of linear kinematic features (LKFs). Only the first CD variant demonstrates some sensitivity to the representation of scalar fields (sea-ice concentration and thickness), simulating a finer structure of LKFs with the cell-based scalars than with the vertex-based scalars.

Sergey Danilov et al.

Status: open (extended)

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  • RC1: 'Comment on gmd-2023-37', Anonymous Referee #1, 04 Jun 2023 reply

Sergey Danilov et al.

Sergey Danilov et al.


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Short summary
Sea ice models are a necessary component of climate models. At very high resolution they are capable of simulating linear kinematic features, such as leads, which are important for better prediction of heat exchanges between the ocean and atmosphere. Two new discretizations are described which improve the sea-ice component of the Finite volumE Sea ice – Ocean Model (FESOM version 2) by allowing simulations of finer scales.