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    The Efficiency of Mixing in Turbulent Patches: Inferences from Direct Simulations and Microstructure Observations

    Source: Journal of Physical Oceanography:;2001:;Volume( 031 ):;issue: 008::page 1969
    Author:
    Smyth, W. D.
    ,
    Moum, J. N.
    ,
    Caldwell, D. R.
    DOI: 10.1175/1520-0485(2001)031<1969:TEOMIT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The time evolution of mixing in turbulent overturns is investigated using a combination of direct numerical simulations (DNS) and microstructure profiles obtained during two field experiments. The focus is on the flux coefficient Γ, the ratio of the turbulent buoyancy flux to the turbulent kinetic energy dissipation rate ?. In observational oceanography, a constant value Γ = 0.2 is often used to infer the buoyancy flux and the turbulent diffusivity from measured ?. In the simulations, the value of Γ changes by more than an order of magnitude over the life of a turbulent overturn, suggesting that the use of a constant value for Γ is an oversimplification. To account for the time dependence of Γ in the interpretation of ocean turbulence data, a way to assess the evolutionary stage at which a given turbulent event was sampled is required. The ratio of the Ozmidov scale LO to the Thorpe scale LT is found to increase monotonically with time in the simulated flows, and therefore may provide the needed time indicator. From the DNS results, a simple parameterization of Γ in terms of LO/LT is found. Applied to observational data, this parameterization leads to a 50%?60% increase in median estimates of turbulent diffusivity, suggesting a potential reassessment of turbulent diffusivity in weakly and intermittently turbulent regimes such as the ocean interior.
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      The Efficiency of Mixing in Turbulent Patches: Inferences from Direct Simulations and Microstructure Observations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4166712
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    contributor authorSmyth, W. D.
    contributor authorMoum, J. N.
    contributor authorCaldwell, D. R.
    date accessioned2017-06-09T14:54:41Z
    date available2017-06-09T14:54:41Z
    date copyright2001/08/01
    date issued2001
    identifier issn0022-3670
    identifier otherams-29480.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4166712
    description abstractThe time evolution of mixing in turbulent overturns is investigated using a combination of direct numerical simulations (DNS) and microstructure profiles obtained during two field experiments. The focus is on the flux coefficient Γ, the ratio of the turbulent buoyancy flux to the turbulent kinetic energy dissipation rate ?. In observational oceanography, a constant value Γ = 0.2 is often used to infer the buoyancy flux and the turbulent diffusivity from measured ?. In the simulations, the value of Γ changes by more than an order of magnitude over the life of a turbulent overturn, suggesting that the use of a constant value for Γ is an oversimplification. To account for the time dependence of Γ in the interpretation of ocean turbulence data, a way to assess the evolutionary stage at which a given turbulent event was sampled is required. The ratio of the Ozmidov scale LO to the Thorpe scale LT is found to increase monotonically with time in the simulated flows, and therefore may provide the needed time indicator. From the DNS results, a simple parameterization of Γ in terms of LO/LT is found. Applied to observational data, this parameterization leads to a 50%?60% increase in median estimates of turbulent diffusivity, suggesting a potential reassessment of turbulent diffusivity in weakly and intermittently turbulent regimes such as the ocean interior.
    publisherAmerican Meteorological Society
    titleThe Efficiency of Mixing in Turbulent Patches: Inferences from Direct Simulations and Microstructure Observations
    typeJournal Paper
    journal volume31
    journal issue8
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(2001)031<1969:TEOMIT>2.0.CO;2
    journal fristpage1969
    journal lastpage1992
    treeJournal of Physical Oceanography:;2001:;Volume( 031 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian