Modelling wave-ice interactions in three-dimensions in the marginal ice zone

• Main Authors: Perrie, W., Meylan, M., Toulany, B., Casey, M.
• Format: Conference Object
• Language: English
• Published: 2023
• Subjects: Arctic; Bedford; Beaufort Sea; Climate change; Sea ice
• Online Access: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021229

The study and forecasting of Arctic storms, and their ocean surface waves, are important issues, particularly with climate change, and decreasing sea ice. Our focus is three different modern wave-ice models, with particular attention for three-dimensional wave-scattering, which is challenging to implement because of required energy redistribution. These models have only recently been implemented in WAVEWATCHIII wave model, with sufficient efficiency for operational forecasts, as described by Perrie et al. (2022, doi.org/10.1098/rsta.2021.0263). We perform the simulation of large-scale ocean waves and controlled inter-comparisons, for these wave-ice models for a simple hypothetical ocean and Marginal Ice Zone (MIZ); test cases for wave development and attenuation are driven by constant winds, to identify model weaknesses. Our follow-on work compares model simulations with field measurements using relatively high-quality data, collected by wave buoys from the Sea State Boundary Layer Experiment of 2015 in the Beaufort Sea. This experiment includes several storm events and a variety of wave systems and MIZ situations, with differing ice floe sizes, concentrations and thicknesses. Results are given in this presentation. Regarding the wave-ice models, one is the Bedford Institute of Oceanography (BIO) model which involves 3-dimensional wave-ice interactions for wave attenuation and three-dimensional wave scattering. The second model (MBS) uses the full integration of the scattering kernel, (like BIO), and includes flexible ice floes, based on papers by Meylan, Bennetts and Squire. The third is like MBS, with additional energy dissipation. MBS and MBS’ models assume no ice floe submergence; BIO has rigid MIZ floes that submerge partially.