Abstract
Abstract Turbulence measurements from under drifting pack ice illustrate the distribution of turbulent mixing length in the well-mixed layer of the upper ocean. Mixing length (λ ≡ K/u*, where K and u* are the local eddy viscosity and square root of Reynolds stress, respectively) is found to vary inversely with wavenumber at the peak in the weighted vertical velocity variance spectrum: λ = cλ/kmax. This relation provides an empirical tool for making local estimates of eddy viscosity if the Reynolds stress is known, or alternatively, deriving fluxes via the inertial-dissipation method in the outer part of the rotational boundary layer. The vertical structure of λ is described for conditions of (i) neutral stratification (negligible surface buoyancy flux) under thick ice. (ii) stable stratification under rapidly melting ice, and (iii) statically unstable conditions from intense freezing. The last example, obtained during the 1992 Lead Experiment, included dime measurements of turbulent salinity flux, 〈w′S′〉....
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