Preprints
https://doi.org/10.5194/tc-2021-273
https://doi.org/10.5194/tc-2021-273

  01 Nov 2021

01 Nov 2021

Review status: this preprint is currently under review for the journal TC.

A probabilistic seabed-ice keel interaction model

Frédéric Dupont4, Dany Dumont1, Jean-François Lemieux2, Elie Dumas-Lefebvre1, and Alain Caya3 Frédéric Dupont et al.
  • 1Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, Rimouski QC, Canada
  • 2Recherche en Prévision Numérique Environnementale/Environnement et Changement Climatique Canada, 2121 route Transcanadienne, Dorval QC, Canada
  • 3Recherche en assimilation de données et météorologie satellitaire, Environnement et Changement Climatique Canada, 2121 route Transcanadienne, Dorval QC, Canada
  • 4Service Météorologique Canadien, Environnement et Changement Climatique Canada, 2121 route Transcanadienne, Dorval QC, Canada

Abstract. In some coastal regions of the Arctic Ocean, as well as in shallow seasonally ice-covered seas, grounded ice ridges contribute to stabilizing and maintaining a landfast ice cover. Recently, a grounding scheme representing this effect on sea ice dynamics was introduced and tested in a coupled ice-ocean model. This grounding scheme, based on a parameterization of ridged keel thickness linearly correlated to the mean thickness, improves the simulation of landfast ice in many regions such as in the East Siberian Sea, the Laptev Sea and along the coast of Alaska. Nevertheless, this parameterization is based solely on the mean properties of sea ice. Here, we extend the parameterization by taking into account subgridscale ice thickness distribution and bathymetry distributions, which are generally non-normal, and by computing the maximum seabed stress as a joint probability interaction between the ice and the seabed. The probabilistic approach shows a reasonably good agreement with observations and with the previously proposed grounding scheme while potentially offering more physical insights in the formation of landfast ice.

Frédéric Dupont et al.

Status: open (until 27 Dec 2021)

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Frédéric Dupont et al.

Frédéric Dupont et al.

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Short summary
In some shallow seas, grounded ice ridges contribute to stabilizing and maintaining a landfast ice cover. A scheme has already proposed where the keel thickness varies linearly with the mean thickness. Here, we extend the approach by taking into account the ice thickness and bathymetry distributions. The probabilistic approach shows a reasonably good agreement with observations and previous grounding scheme while potentially offering more physical insights in the formation of landfast ice.