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    A Comparison of Vertical Eddy Mixing Parameterizations for Equatorial Ocean Models

    Source: Journal of Physical Oceanography:;1993:;Volume( 023 ):;issue: 008::page 1823
    Author:
    Smith, Neville R.
    ,
    Hess, G. Dale
    DOI: 10.1175/1520-0485(1993)023<1823:ACOVEM>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The vertical eddy mixing formulations employed in the K-theory model of Pacanowski and Philander and in second-moment closure models are compared for an equatorial Pacific Ocean simulation. The Pacanowski and Philander model is found to be mainly driven by changes in the stratification rather than shear-generated instabilities, and the position and width of the mixing transition zone between high and low mixing values is found to be sensitive to the parameters of the model. In the second-moment closure models the master length scale limit effectively determines the threshold of the mixing zone, while the inclusion of storage, advection, and diffusion terms in the turbulent kinetic energy equation affects both the position and extent of the transition zone. Viscous mixing is more intense than diffusive mixing in the Pacanowski and Philander scheme, but in the second-moment closure models the reverse tends to be true. As expected, there is no simple functional relationship between the gradient Richardson number and the intensity of mixing in the second-moment closure schemes.
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      A Comparison of Vertical Eddy Mixing Parameterizations for Equatorial Ocean Models

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4165153
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    contributor authorSmith, Neville R.
    contributor authorHess, G. Dale
    date accessioned2017-06-09T14:50:49Z
    date available2017-06-09T14:50:49Z
    date copyright1993/08/01
    date issued1993
    identifier issn0022-3670
    identifier otherams-28077.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165153
    description abstractThe vertical eddy mixing formulations employed in the K-theory model of Pacanowski and Philander and in second-moment closure models are compared for an equatorial Pacific Ocean simulation. The Pacanowski and Philander model is found to be mainly driven by changes in the stratification rather than shear-generated instabilities, and the position and width of the mixing transition zone between high and low mixing values is found to be sensitive to the parameters of the model. In the second-moment closure models the master length scale limit effectively determines the threshold of the mixing zone, while the inclusion of storage, advection, and diffusion terms in the turbulent kinetic energy equation affects both the position and extent of the transition zone. Viscous mixing is more intense than diffusive mixing in the Pacanowski and Philander scheme, but in the second-moment closure models the reverse tends to be true. As expected, there is no simple functional relationship between the gradient Richardson number and the intensity of mixing in the second-moment closure schemes.
    publisherAmerican Meteorological Society
    titleA Comparison of Vertical Eddy Mixing Parameterizations for Equatorial Ocean Models
    typeJournal Paper
    journal volume23
    journal issue8
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1993)023<1823:ACOVEM>2.0.CO;2
    journal fristpage1823
    journal lastpage1830
    treeJournal of Physical Oceanography:;1993:;Volume( 023 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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