Dissipation of wind waves by pancake and frazil ice in the autumn Beaufort Sea: WAVE DAMPING BY ICE IN THE BEAUFORT SEA

A model for wind-generated surface gravity waves, WAVEWATCH IIIR , is used to analyze and interpret buoy measurements of wave spectra. The model is applied to a hindcast of a wave event in sea ice in the western Arctic, 11–14 October 2015, for which extensive buoy and ship-borne measurements were made during a research cruise. The model, which uses a viscoelastic parameterization to represent the impact of sea ice on the waves, is found to have good skill—after calibration of the effective viscosity—for prediction of total energy, but over-predicts dissipation of high frequency energy by the sea ice. This shortcoming motivates detailed analysis of the apparent dissipation rate. A new inversion method is applied to yield, for each buoy spectrum, the inferred dissipation rate as a function of wave frequency. For 102 of the measured wave spectra, visual observations of the sea ice were available from buoy-mounted cameras, and ice categories (primarily for varying forms of pancake and frazil ice) are assigned to each based on the photographs. When comparing the inversion-derived dissipation profiles against the independently derived ice categories, there is remarkable correspondence, with clear sorting of dissipation profiles into groups of similar ice type. These profiles are largely monotonic: they do not exhibit the ‘‘roll-over’’ that has been found at high frequencies in some previous observational studies.

[1]  William Perrie,et al.  Emerging trends in the sea state of the Beaufort and Chukchi seas , 2016 .

[2]  J. Gemmrich,et al.  Spatial characteristics of ocean surface waves , 2016, Ocean Dynamics.

[3]  Fabrice Ardhuin,et al.  Ocean waves across the Arctic: Attenuation due to dissipation dominates over scattering for periods longer than 19 s , 2016 .

[4]  Yu Wang,et al.  Wind and Wave Influences on Sea Ice Floe Size and Leads in the Beaufort and Chukchi Seas During the Summer-Fall Transition 2014 , 2016 .

[5]  J. Gemmrich,et al.  Wave-Breaking Turbulence in the Ocean Surface Layer , 2015 .

[6]  P. Posey,et al.  Short‐term sea ice forecasting: An assessment of ice concentration and ice drift forecasts using the U.S. Navy's Arctic Cap Nowcast/Forecast System , 2015 .

[7]  Johannes E. M. Mosig,et al.  Comparison of viscoelastic‐type models for ocean wave attenuation in ice‐covered seas , 2015 .

[8]  H. Shen,et al.  Comparison of wave propagation through ice covers in calm and storm conditions , 2015 .

[9]  Giacomo De Carolis,et al.  Relating wave attenuation to pancake ice thickness, using field measurements and model results , 2015 .

[10]  Maria Flatau,et al.  The Navy Global Environmental Model , 2014 .

[11]  S. Zieger,et al.  New Wave-Ice Interaction Physics in WAVEWATCH III , 2014 .

[12]  L. Bennetts,et al.  In situ measurements and analysis of ocean waves in the Antarctic marginal ice zone , 2014 .

[13]  A. Kohout,et al.  Storm-induced sea-ice breakup and the implications for ice extent , 2014, Nature.

[14]  Jim Thomson,et al.  Swell and sea in the emerging Arctic Ocean , 2014 .

[15]  L. Bennetts,et al.  Wave-ice interactions in the marginal ice zone. Part 1: Theoretical foundations , 2013 .

[16]  L. Bennetts,et al.  Wave-ice interactions in the marginal ice zone. Part 2: Numerical implementation and sensitivity studies along 1D transects of the ocean surface , 2013 .

[17]  J. Bidlot,et al.  Wave buoy measurements at the Antarctic sea ice edge compared with an enhanced ECMWF WAM: Progress towards global waves-in-ice modelling , 2013 .

[18]  J. Thomson.  Wave Breaking Dissipation Observed with “SWIFT” Drifters , 2012 .

[19]  Jamie MacMahan,et al.  Observing Ocean Surface Waves with GPS-Tracked Buoys , 2012 .

[20]  David Rind,et al.  Regions of rapid sea ice change: An inter‐hemispheric seasonal comparison , 2012 .

[21]  L. Bennetts,et al.  On the calculation of an attenuation coefficient for transects of ice-covered ocean , 2012, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[22]  Dany Dumont,et al.  A wave‐based model for the marginal ice zone including a floe breaking parameterization , 2011 .

[23]  H. Shen,et al.  Gravity waves propagating into an ice-covered ocean: A viscoelastic model , 2010 .

[24]  M. Doble.  Simulating pancake and frazil ice growth in the Weddell Sea: A process model from freezing to consolidation , 2009 .

[25]  E. Rogers,et al.  Semiempirical Dissipation Source Functions for Ocean Waves. Part I: Definition, Calibration, and Validation , 2009, 0907.4240.

[26]  A. Kohout,et al.  An elastic plate model for wave attenuation and ice floe breaking in the marginal ice zone , 2008 .

[27]  V. Polnikov,et al.  Calculation of the nonlinear energy transfer through the wave spectrum at the sea surface covered with broken ice , 2007 .

[28]  F. Parmiggiani,et al.  SAR imaging of wave dispersion in Antarctic pancake ice and its use in measuring ice thickness , 2004 .

[29]  G. Carolis,et al.  Dispersion and attenuation of gravity waves in ice: a two-layer viscous fluid model with experimental data validation , 2002 .

[30]  W. Perrie,et al.  Air–Ice–Ocean Momentum Exchange. Part 1:Energy Transfer between Waves and Ice Floes , 1996 .

[31]  Peter Wadhams,et al.  The development of the Odden ice tongue in the Greenland Sea during winter 1993 from remote sensing and field observations , 1996 .

[32]  Andrew T. Cox,et al.  Evaluation of Contemporary Ocean Wave Models in Rare Extreme Events: The “Halloween Storm” of October 1991 and the “Storm of the Century” of March 1993 , 1996 .

[33]  Hendrik L. Tolman,et al.  A Third-Generation Model for Wind Waves on Slowly Varying, Unsteady, and Inhomogeneous Depths and Currents , 1991 .

[34]  Paris W. Vachon,et al.  Wave propagation in the marginal ice zone: Model predictions and comparisons with buoy and synthetic aperture radar data , 1991 .

[35]  D. Masson,et al.  Spectral evolution of wind-generated surface gravity waves in a dispersed ice field , 1989, Journal of Fluid Mechanics.

[36]  D. J. Goodman,et al.  The attenuation rates of ocean waves in the marginal ice zone , 1988 .

[37]  B. Johansson,et al.  Dynamical coupling of wind and ocean waves through wave-induced air flow , 2003 .

[38]  Hendrik L. Tolman,et al.  Treatment of unresolved islands and ice in wind wave models , 2003 .

[39]  S. Ackley,et al.  A conceptual model for pancake-ice formation in a wave field , 2001, Annals of Glaciology.

[40]  Peter Wadhams,et al.  Of Ocean Waves and Sea Ice , 1995 .

[41]  S. Elgar.  Bias of Effective Degrees of Freedom of a Spectrum , 1987 .

[42]  B. Ramsay,et al.  Published online in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/hyp.6720 Enhancements to, and forthcoming developments in the Interactive Multisensor Snow and Ice Mapping System (IMS) † , 2022 .