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Related Experiment Videos

Mixing Efficiency in the Ocean.

M C Gregg1, E A D'Asaro1, J J Riley2

  • 1Applied Physics Laboratory and School of Oceanography, University of Washington, Seattle, Washington 98105, USA; email: mgregg@uw.edu , dasaro@apl.washington.edu.

Annual Review of Marine Science
|September 22, 2017
PubMed
Summary
This summary is machine-generated.

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This study validates a mixing coefficient of 0.2 for estimating ocean diapycnal diffusivity. Current methods for mixing efficiency lack convergence, necessitating a collaborative research approach.

Area of Science:

  • Oceanography
  • Fluid Dynamics
  • Turbulence

Background:

  • Mixing efficiency quantifies energy conversion during mixing processes.
  • Accurate parameterizations of mixing efficiency and coefficients are crucial for estimating diapycnal diffusivity from turbulent dissipation rates.

Purpose of the Study:

  • To verify the mixing coefficient for diapycnal diffusivity estimation.
  • To assess the current state of mixing efficiency and coefficient parameterizations.

Main Methods:

  • Comparing diapycnal diffusivities derived from microstructure profiling with those inferred from tracer release experiments.
  • Reviewing various approaches including channel flows, laboratory experiments, and numerical simulations for mixing efficiency estimation.

Main Results:

Keywords:
Kelvin-Helmholtz instabilitydiapycnal diffusivitydifferential diffusionmixing coefficientmixing efficiencystratified turbulence

Related Experiment Videos

  • A mixing coefficient of 0.2 was verified within observational accuracy across a wide range of diapycnal diffusivities.
  • Estimates for mixing efficiency and coefficients from different methods show a lack of convergence.

Conclusions:

  • The validated mixing coefficient provides a reliable tool for diapycnal diffusivity estimation.
  • A coordinated community effort is recommended to advance the understanding and parameterization of mixing efficiency.