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Modelling wave-ice interactions in three dimensions in the marginal ice zone.
Will Perrie1, Michael H Meylan2, Bechara Toulany1
1Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada.
Summary
New wave-ice interaction models show reduced wave height attenuation in the marginal ice zone (MIZ). These formulations improve wave scattering and attenuation simulations for flexible ice floes.
Area of Science:
- Oceanography
- Polar Science
- Applied Mathematics
Background:
- Ocean surface waves significantly impact the marginal ice zone (MIZ).
- Accurate modeling of wave-ice interactions is crucial for understanding MIZ dynamics.
- Existing parametrizations for wave scattering by ice floes have limitations.
Purpose of the Study:
- To compare two recent 3D formulations for wave-ice interactions.
- To evaluate selected parametrizations for ocean wave scattering by flexible ice floes.
- To assess the performance of these formulations within the WAVEWATCH III® (WW3) model.
Main Methods:
- Idealized simulations of wave-ice interactions.
- Implementation of wave-ice parametrizations as source terms in WW3's action balance equation.
- Hypothetical experiments to characterize parametrization behaviors.
Main Results:
- The two new formulations exhibit less intense wave height attenuation in the propagation direction compared to others.
- One-dimensional attenuation spans the entire frequency domain, reaching the high-frequency limit.
- Simulations show a 'roll-over' effect in attenuation within the MIZ beyond the ice edge.
Conclusions:
- The new wave-ice formulations show potential for improving wave scattering and attenuation simulations in the MIZ.
- These models offer a more nuanced representation of wave energy dissipation by flexible ice.
- Further research can refine these models for enhanced MIZ process understanding.
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