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- W2804578656 abstract "Abstract Recent progress in direct numerical simulations (DNSs) of stratified turbulent flows has led to increasing attention to the validity of the constancy of the dissipation flux coefficient Γ in the Osborn’s eddy diffusivity model. Motivated by lack of observational estimates of Γ, particularly under weakly stratified deep-ocean conditions, this study estimates Γ using deep microstructure profiles collected in various regions of the North Pacific and Southern Oceans. It is shown that Γ is not constant but varies significantly with the Ozmidov/Thorpe scale ratio R OT in a fashion similar to that obtained by previous DNS studies. Efficient mixing events with Γ ~ O (1) and R OT ~ O (0.1) tend to be frequently observed in the deep ocean (i.e., weak stratification), while moderate mixing events with Γ ~ O (0.1) and R OT ~ O (1) tend to be observed in the upper ocean (i.e., strong stratification). The observed negative relationship between Γ and R OT is consistent with a simple scaling that can be derived from classical turbulence theories. In contrast, the observed results exhibit no definite relationships between Γ and the buoyancy Reynolds number Re b , although Re b has long been thought to be another key parameter that controls Γ." @default.
- W2804578656 created "2018-06-01" @default.
- W2804578656 creator A5027466363 @default.
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- W2804578656 date "2018-08-01" @default.
- W2804578656 modified "2023-10-14" @default.
- W2804578656 title "Observed Variations in Turbulent Mixing Efficiency in the Deep Ocean" @default.
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- W2804578656 doi "https://doi.org/10.1175/jpo-d-17-0275.1" @default.
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