The Impact of Tides on Simulated Landfast Ice in a Pan-Arctic Ice-Ocean Model

• Published in: Journal of Geophysical Research: Oceans
• Main Authors: Lemieux, Jean-François, Lei, Ji, Dupont, Frédéric, Roy, François, Losch, Martin, Lique, Camille, Laliberté, Frédéric
• Other Authors: Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: landfast ice; tides; ice-ocean model; [SDU]Sciences of the Universe [physics]; [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Arctic; Gulf of Boothia; Lancaster Sound; Prince Regent Inlet
• Online Access: https://insu.hal.science/insu-03683062; https://insu.hal.science/insu-03683062/document; https://insu.hal.science/insu-03683062/file/JGR%20Oceans%20-%202018%20-%20Lemieux%20-%20The%20Impact%20of%20Tides%20on%20Simulated%20Landfast%20Ice%20in%20a%20Pan%25u2010Arctic%20Ice%25u2010Ocean%20Model.pdf; https://doi.org/10.1029/2018JC014080

International audience The impact of tides on the simulated landfast ice cover is investigated. Pan-Arctic simulations are conducted with an ice-ocean (CICE-NEMO) model with a modified rheology and a grounding scheme. The reference experiment (without tides) indicates there is an overestimation of the extent of landfast ice in regions of strong tides such as the Gulf of Boothia, Prince Regent Inlet, and Lancaster Sound. The addition of tides in the simulation clearly leads to a decrease of the extent of landfast ice in some tidally active regions. This numerical experiment with tides is more in line with observations of landfast ice in all the regions studied. Thermodynamics and changes in grounding cannot explain the lower landfast ice area when tidal forcing is included. We rather demonstrate that this decrease in the landfast ice extent is dynamically driven by the increase of the ocean-ice stress due to the tides.