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Comparing observations and parameterizations of ice-ocean drag through an annual cycle across the Beaufort Sea
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  • Samuel Dale Brenner,
  • Luc Rainville,
  • Jim Thomson,
  • Sylvia T. Cole,
  • Craig M. Lee
Samuel Dale Brenner
Applied Physics Laboratory, University of Washington

Corresponding Author:[email protected]

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Luc Rainville
Applied Physics Laboratory, University of Washington
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Jim Thomson
University of Washington
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Sylvia T. Cole
Woods Hole Oceanographic Institution
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Craig M. Lee
Applied Physics Laboratory, University of Washington
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Abstract

Understanding and predicting sea ice dynamics and ice-ocean feedback processes requires accurate descriptions of momentum fluxes across the ice-ocean interface. In this study, we present observations from an array of moorings in the Beaufort Sea. Using a force-balance approach, we determine ice-ocean drag coefficient values over an annual cycle and a range of ice conditions. Statistics from high resolution ice draft measurements are used to calculate expected drag coefficient values from morphology-based parameterization schemes. With both approaches, drag coefficient values ranged from approximately 1-10×10^-3, with a minimum in fall and a maximum at the end of spring, consistent with previous observations. The parameterizations do a reasonable job of predicting the observed drag values if the under ice geometry is known, and reveal that keel drag is the primary contributor to the total ice-ocean drag coefficient. When translations of bulk model outputs to ice geometry are included in the parameterizations, they overpredict drag on floe edges, leading to the inverted seasonal cycle seen in prior models. Using these results to investigate the efficiency of total momentum flux across the atmosphere-ice-ocean interface suggests an inter-annual trend of increasing coupling between the atmosphere and the ocean.