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Mixing Efficiencies in Turbulent Tidal Fronts: Results from Direct and Indirect Measurements of Density Flux

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  • The authors report direct measurements of density flux at a single depth in a turbulent tidal flow, made by towing a CTD beside the vertical beam of a modified acoustic Doppler current profiler. The direct flux estimates are compared with indirect estimates of density flux based on simultaneous microscale profiler measurements of ϵ and χ, dissipation rates of turbulent kinetic energy and of temperature variance, respectively. Two mixing efficiency estimates are made using Γ𝒹 from the ratios of indirect flux estimates and Γ₀ from the ratio of direct to ϵ flux estimates. The analysis indicates that • Γ𝒹 is no different from that determined in other open ocean experiments and is independent of the sign of the flux • Γ 𝒹 < |Γ₀|, regardless of the sign of the flux • Γ₀ (flux > 0) < |Γ₀| (flux < 0). The consequences for interpretation of ocean microstructure flux estimates are discussed.
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  • Gargett, Ann E., J. N. Moum, 1995: Mixing Efficiencies in Turbulent Tidal Fronts: Results from Direct and Indirect Measurements of Density Flux. J. Phys. Oceanogr., 25, 2583–2608.
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  • 25
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  • 11
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  • Oregon State participation in this work was supported by ONR Grant N00014-89-J3211.
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