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    The Description of Mixing in Stratified Layers without Shear in Large-Scale Ocean Models

    Source: Journal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 011::page 3032
    Author:
    Umlauf, Lars
    DOI: 10.1175/2009JPO4006.1
    Publisher: American Meteorological Society
    Abstract: Large-scale geophysical flows often exhibit layers with negligible vertical shear and infinite gradient Richardson number Ri. It is well known that these layers may be regions of active mixing, even in the absence of local shear production of turbulence because, among other processes, turbulence may be supplied by vertical turbulent transport from neighboring regions. This observation is contrasted by the behavior of most turbulence parameterizations used in ocean climate modeling, predicting the collapse of mixing of mass and matter if the Richardson number exceeds a critical threshold. Here, the performance of a simple model without critical Richardson number is evaluated, taking into account the diffusion of turbulence into layers without shear production and therefore avoiding the suppression of mixing at large values of Ri. The model is based on the framework of second-moment turbulence closures, focusing on the consistent modeling of the turbulent length scale for strongly stratified turbulence. Results are compared to eddy-resolving simulations of stratified shear flows that have recently become available. The model is simple enough for inclusion in ocean climate models.
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      The Description of Mixing in Stratified Layers without Shear in Large-Scale Ocean Models

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4210737
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    contributor authorUmlauf, Lars
    date accessioned2017-06-09T16:30:27Z
    date available2017-06-09T16:30:27Z
    date copyright2009/11/01
    date issued2009
    identifier issn0022-3670
    identifier otherams-69104.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4210737
    description abstractLarge-scale geophysical flows often exhibit layers with negligible vertical shear and infinite gradient Richardson number Ri. It is well known that these layers may be regions of active mixing, even in the absence of local shear production of turbulence because, among other processes, turbulence may be supplied by vertical turbulent transport from neighboring regions. This observation is contrasted by the behavior of most turbulence parameterizations used in ocean climate modeling, predicting the collapse of mixing of mass and matter if the Richardson number exceeds a critical threshold. Here, the performance of a simple model without critical Richardson number is evaluated, taking into account the diffusion of turbulence into layers without shear production and therefore avoiding the suppression of mixing at large values of Ri. The model is based on the framework of second-moment turbulence closures, focusing on the consistent modeling of the turbulent length scale for strongly stratified turbulence. Results are compared to eddy-resolving simulations of stratified shear flows that have recently become available. The model is simple enough for inclusion in ocean climate models.
    publisherAmerican Meteorological Society
    titleThe Description of Mixing in Stratified Layers without Shear in Large-Scale Ocean Models
    typeJournal Paper
    journal volume39
    journal issue11
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2009JPO4006.1
    journal fristpage3032
    journal lastpage3039
    treeJournal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 011
    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