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A model study of convergent dynamics in the marginal ice zone
Jean-Pierre Auclair1,2, Dany Dumont3, Jean-François Lemieux4
1Institut des Sciences de la Terre (ISTerre), CNRS/Université Grenoble-Alpes, Saint-Martin d'Hères, 38400, France.
Summary
This study introduces a new wave and sea ice model to understand wave impacts in the marginal ice zone (MIZ). Findings suggest a Mohr-Coulomb parameterization better represents MIZ compressive strength.
Area of Science:
- Oceanography
- Sea Ice Physics
- Wave Dynamics
Background:
- Operational forecasting models increasingly resolve the marginal ice zone (MIZ).
- Wave propagation, attenuation, and their influence on sea ice dynamics in the MIZ are poorly understood.
- Observations show exponential wave energy decay in sea ice, affecting ice strength and structure.
Purpose of the Study:
- To develop and test a one-dimensional, integrated wave and sea ice model.
- To investigate the influence of wave-ice interactions on sea ice dynamics.
- To explore different parameterizations for wave-ice interactions.
Main Methods:
- Development of a fully integrated one-dimensional wave and sea ice model.
- Testing various parameterizations of wave-ice interactions.
- Sensitivity analyses under diverse wind, wave, and ice conditions.
Main Results:
- Wave energy decreases exponentially with distance in sea ice, particularly at higher frequencies.
- Wave-ice interactions transfer energy to the ice, causing fracturing and weakening.
- Sensitivity analyses highlight complex interplay between wave attenuation and ice rheology.
Conclusions:
- A Mohr-Coulomb parameterization with nonlinear thickness dependence may better represent MIZ compressive strength.
- The model provides a framework for testing wave-ice interaction theories.
- Further research is needed to refine models of MIZ dynamics.
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