<  Retour au portail Polytechnique Montréal

Improving the simulation of landfast ice by combining tensile strength and a parameterization for grounded ridges

Jean-François Lemieux, Frédéric Dupont, Philippe Blain, François Roy, Gregory C. Smith et Gregory M. Flato

Article de revue (2016)

Document en libre accès dans PolyPublie et chez l'éditeur officiel
[img]
Affichage préliminaire
Libre accès au plein texte de ce document
Version officielle de l'éditeur
Conditions d'utilisation: Creative Commons: Attribution-Pas d'utilisation commerciale-Pas de modification (CC BY-NC-ND)
Télécharger (1MB)
Afficher le résumé
Cacher le résumé

Abstract

In some coastal regions of the Arctic Ocean, grounded ice ridges contribute to stabilizing andmaintaining a landfast ice cover. Recently, a grounding scheme representing this effect on sea ice dynamicswas introduced and tested in a viscous-plastic sea ice model. This grounding scheme, based on a basalstress parameterization, improves the simulation of landfast ice in many regions such as in the East SiberianSea, the Laptev Sea, and along the coast of Alaska. Nevertheless, in some regions like the Kara Sea, the areaof landfast ice is systematically underestimated. This indicates that another mechanism such as ice archingis at play for maintaining the ice cover fast. To address this problem, the combination of the basal stressparameterization and tensile strength is investigated using a 0.258Pan-Arctic CICE-NEMO configuration.Both uniaxial and isotropic tensile strengths notably improve the simulation of landfast ice in the Kara Seabut also in the Laptev Sea. However, the simulated landfast ice season for the Kara Sea is too short com-pared to observations. This is especially obvious for the onset of the landfast ice season which systematical-ly occurs later in the model and with a slower build up. This suggests that improvements to the sea icethermodynamics could reduce these discrepancies with the data.

Key Points - A grounding scheme is not enough to simulate landfast ice in Pan-Arctic simulations; - Both uniaxial and isotropic tensile strengths notably improve the simulation of landfast ice in deep coastal regions; - Simulated landfast ice season in the Kara Sea is still too short suggesting that thermodynamics should be improved.

Sujet(s): 4500 Hydrologie > 4505 Glaciologie
4600 Océanographie > 4600 Océanographie
Département: Département de génie physique
URL de PolyPublie: https://publications.polymtl.ca/4997/
Titre de la revue: Journal of Geophysical Research : Oceans (vol. 121, no 10)
Maison d'édition: AGU Publications
DOI: 10.1002/2016jc012006
URL officielle: https://doi.org/10.1002/2016jc012006
Date du dépôt: 19 déc. 2022 14:30
Dernière modification: 28 sept. 2024 04:05
Citer en APA 7: Lemieux, J.-F., Dupont, F., Blain, P., Roy, F., Smith, G. C., & Flato, G. M. (2016). Improving the simulation of landfast ice by combining tensile strength and a parameterization for grounded ridges. Journal of Geophysical Research : Oceans, 121(10), 7354-7368. https://doi.org/10.1002/2016jc012006

Statistiques

Total des téléchargements à partir de PolyPublie

Téléchargements par année

Provenance des téléchargements

Dimensions

Actions réservées au personnel

Afficher document Afficher document