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Esters, L,Breivik, O,Landwehr, S,ten Doeschate, A,Sutherland, G,Christensen, KH,Bidlot, JR,Ward, B
2018
March
Journal Of Geophysical Research-Oceans
Turbulence Scaling Comparisons in the Ocean Surface Boundary Layer
Published
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Optional Fields
turbulence scaling upper ocean KINETIC-ENERGY DISSIPATION WAVE-ENHANCED TURBULENCE NEAR-SURFACE MIXED-LAYER BREAKING WAVES STOKES DRIFT MICROSTRUCTURE MEASUREMENTS LANGMUIR TURBULENCE VERTICAL STRUCTURE GAS TRANSFER
123
2172
2191
Direct observations of the dissipation rate of turbulent kinetic energy, epsilon, under open ocean conditions are limited. Consequently, our understanding of what chiefly controls dissipation in the open ocean, and its functional form with depth, is poorly constrained. In this study, we report direct open ocean measurements of epsilon from the Air-Sea Interaction Profiler (ASIP) collected during five different cruises in the Atlantic Ocean. We then combine these data with ocean-atmosphere flux measurements and wave information in order to evaluate existing turbulence scaling theories under a diverse set of open ocean conditions. Our results do not support the presence of a "breaking" or a "transition layer," which has been previously suggested. Instead, epsilon decays as vertical bar z vertical bar(-1.29) over the depth interval, which was previously defined as "transition layer," and as vertical bar z vertical bar(-1.15) over the mixing layer. This depth dependency does not significantly vary between nonbreaking or breaking wave conditions. A scaling relationship based on the friction velocity, the wave age, and the significant wave height describes the observations best for daytime conditions. For conditions during which convection is important, it is necessary to take buoyancy forcing into account.
10.1002/2017JC013525
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