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On simulating high-frequency variability in Antarctic sea-ice dynamics models

  • W. D. Hibler III (a1), Petra Heil (a2) and Victoria I. Lytle (a3)

Abstract

Due to frequent and intense storm systems moving across the Antarctic sea ice, ice drift and deformation fluctuate substantially. Observations of drilling buoys show inertial power to be a substantial component of ice drift and deformation. Because the inertial period at high latitudes is close to tidal periods, this peak can be amplified due to resonance. in practice, the energy dissipation by ice interaction plays a significant role in dampening out this inertial energy. in present sea-ice dynamics models both with and without ice interaction, this inertial motion is overdamped due to the underestimation of coupling to the ocean boundary layer. To develop a more consistent treatment of ice drift under fluctuating wind fields, we consider here a vertically integrated formulation of the ice-ocean boundary-layer system that incorporates a more realistic treatment of the upper ocean. Under steady wind conditions this model reduces to the normal water-drag formulation used in most sea-ice dynamics models. Simulations using this “imbedded” model are analyzed to elucidate the role of ice interaction in the Antarctic ice-pack in modifying the high-frequency motion and inducing deformation which in turn significantly impact ice-thickness characteristics. The simulations demonstrate that in an interacting ice field in the presence of kinematic waves inertial imbedding can lead to oscillations in ice concentration of up to ~10% open water. These variations are similar in magnitude to observed deformation fluctuations in tide-free regions.

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Copyright

References

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Geiger, C. A., Ackley, S. F. and Hibler, W. D., III. 1998. Sea ice drift and deformation processes in the western Weddcll Sea. in Jeffries, M. O., ed. Antarctic sea ice: physical processes, interactions and variability. Washington DC, American Geophysical Union, 141160. (Antarctic Research Series 74.)
Geiger, C. A., Hibler, W. D., III and Ackley, S. F.. in press. Large-scale sea ice drift and deformation processes in the western Weddcll Sea. J. Geophys. Res.
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On simulating high-frequency variability in Antarctic sea-ice dynamics models

  • W. D. Hibler III (a1), Petra Heil (a2) and Victoria I. Lytle (a3)

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