The effect of observed ice conditions on the drag coefficient in the summer East Greenland Sea Marginal Ice Zone

The summer East Greenland Sea marginal ice zone is a region characterized by extreme horizontal variations of surface roughness characteristics. The surface drag coefficient is found to be correlated with these roughness characteristics, in particular, ice concentration and ice floe roughness and size. The estimates of wind stress and wind speed yield neutral drag coefficients CDN with standard deviations of 2.3 ± 0.8 × 10−3 for areas with less than 40% ice concentration and 4.0 ± 1.1 × 10−3 for ice concentrations greater than 70%. Much of the variation in CDN for a given ice concentration is explained by differences in ice floe size and roughness. Very small, concentrated, rough floes that have been affected by wave action produce twice as much wind stress (CDN = 4.2 ± 0.7 × 10−3) as relatively large, flat floes (CDN = 2.1 ± 0.6 × 10−3) and 4 times as much as typical open ocean for a given wind speed and stability. The drag coefficients in this region are higher than other marginal ice zones, probably a result of the presence of large amounts of multiyear ice floes that extend higher above the ocean surface and create more drag than first-year floes.

[1]  C. Fairall,et al.  Mesoscale variations in surface stress, heat fluxes, and drag coefficient in the marginal ice zone during the 1983 Marginal Ice Zone Experiment , 1987 .

[2]  C. W. Fairall,et al.  Inertial-dissipation methods and turbulent fluxes at the air-ocean interface , 1986 .

[3]  J. Overland.  Atmospheric boundary layer structure and drag coefficients over sea ice , 1985 .

[4]  Robert J. Anderson,et al.  An investigation of a polynya in the Canadian Archipelago , 1983 .

[5]  S. Macklin.  Wind drag coefficient over first‐year sea ice in the Bering Sea , 1983 .

[6]  Sylvain M. Joffre,et al.  Momentum and heat transfers in the surface layer over a frozen sea , 1982 .

[7]  W. Large,et al.  Sensible and Latent Heat Flux Measurements over the Ocean , 1982 .

[8]  C. Fairall,et al.  Measurements of the rate of dissipation of turbulent kinetic energy, ɛ, over the ocean , 1981 .

[9]  Robert A. Brown.  Modeling the geostrophic drag coefficient for AIDJEX , 1981 .

[10]  W. Large,et al.  Open Ocean Momentum Flux Measurements in Moderate to Strong Winds , 1981 .

[11]  Carl A. Friehe,et al.  Flux Measurements, Flux Estimation Techniques, and Fine-Scale Turbulence Measurements in the Unstable Surface Layer Over Land. , 1977 .

[12]  S. Arya,et al.  A drag partition theory for determining the large-scale roughness parameter and wind stress on the Arctic pack ice , 1975 .

[13]  G. McBean,et al.  The Vertical Transports of Kinetic Energy by Turbulence and Pressure in the Boundary Layer , 1975 .

[14]  A. Dyer.  A review of flux-profile relationships , 1974 .

[15]  S. D. Smith,et al.  Wind stress on Arctic sea ice , 1973 .

[16]  S. Arya.  Contribution of form drag on pressure ridges to the air stress on Arctic ice , 1973 .

[17]  J. Wyngaard,et al.  The Budgets of Turbulent Kinetic Energy and Temperature Variance in the Atmospheric Surface Layer , 1971 .

[18]  Hans A. Panofsky,et al.  The geostrophic drag coefficient and the ‘effective’ roughness length , 1972 .

[19]  P. A. Sheppard.  Atmospheric Turbulence , 1947, Nature.