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    Energetics of Bottom Ekman Layers during Buoyancy Arrest

    Source: Journal of Physical Oceanography:;2015:;Volume( 045 ):;issue: 012::page 3099
    Author:
    Umlauf, Lars
    ,
    Smyth, William D.
    ,
    Moum, James N.
    DOI: 10.1175/JPO-D-15-0041.1
    Publisher: American Meteorological Society
    Abstract: urbulent bottom Ekman layers are among the most important energy conversion sites in the ocean. Their energetics are notoriously complex, in particular near sloping topography, where the feedback between cross-slope Ekman transports, buoyancy forcing, and mixing affects the energy budget in ways that are not well understood. Here, the authors attempt to clarify the energy pathways and different routes to mixing, using a combined theoretical and modeling approach. The analysis is based on a newly developed energy flux diagram for turbulent Ekman layers near sloping topography that allows for an exact definition of the different energy reservoirs and energy pathways. Using a second-moment turbulence model, it is shown that mixing efficiencies increase for increasing slope angle and interior stratification, but do not exceed the threshold of 5% except for very steep slopes, where the canonical value of 20% may be reached. Available potential energy generated by cross-slope advection may equal up to 70% of the energy lost to dissipation for upwelling-favorable flow, and up to 40% for downwelling-favorable flow.
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      Energetics of Bottom Ekman Layers during Buoyancy Arrest

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226993
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    contributor authorUmlauf, Lars
    contributor authorSmyth, William D.
    contributor authorMoum, James N.
    date accessioned2017-06-09T17:21:23Z
    date available2017-06-09T17:21:23Z
    date copyright2015/12/01
    date issued2015
    identifier issn0022-3670
    identifier otherams-83735.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226993
    description abstracturbulent bottom Ekman layers are among the most important energy conversion sites in the ocean. Their energetics are notoriously complex, in particular near sloping topography, where the feedback between cross-slope Ekman transports, buoyancy forcing, and mixing affects the energy budget in ways that are not well understood. Here, the authors attempt to clarify the energy pathways and different routes to mixing, using a combined theoretical and modeling approach. The analysis is based on a newly developed energy flux diagram for turbulent Ekman layers near sloping topography that allows for an exact definition of the different energy reservoirs and energy pathways. Using a second-moment turbulence model, it is shown that mixing efficiencies increase for increasing slope angle and interior stratification, but do not exceed the threshold of 5% except for very steep slopes, where the canonical value of 20% may be reached. Available potential energy generated by cross-slope advection may equal up to 70% of the energy lost to dissipation for upwelling-favorable flow, and up to 40% for downwelling-favorable flow.
    publisherAmerican Meteorological Society
    titleEnergetics of Bottom Ekman Layers during Buoyancy Arrest
    typeJournal Paper
    journal volume45
    journal issue12
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-15-0041.1
    journal fristpage3099
    journal lastpage3117
    treeJournal of Physical Oceanography:;2015:;Volume( 045 ):;issue: 012
    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
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