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    Energy Cascades and Loss of Balance in a Reentrant Channel Forced by Wind Stress and Buoyancy Fluxes

    Source: Journal of Physical Oceanography:;2014:;Volume( 045 ):;issue: 001::page 272
    Author:
    Barkan, Roy
    ,
    Winters, Kraig B.
    ,
    Llewellyn Smith, Stefan G.
    DOI: 10.1175/JPO-D-14-0068.1
    Publisher: American Meteorological Society
    Abstract: large fraction of the kinetic energy in the ocean is stored in the ?quasigeostrophic? eddy field. This ?balanced? eddy field is expected, according to geostrophic turbulence theory, to transfer energy to larger scales. In order for the general circulation to remain approximately steady, instability mechanisms leading to loss of balance (LOB) have been hypothesized to take place so that the eddy kinetic energy (EKE) may be transferred to small scales where it can be dissipated. This study examines the kinetic energy pathways in fully resolved direct numerical simulations of flow in a flat-bottomed reentrant channel, externally forced by surface buoyancy fluxes and wind stress in a configuration that resembles the Antarctic Circumpolar Current. The flow is allowed to reach a statistical steady state at which point it exhibits both a forward and an inverse energy cascade. Flow interactions with irregular bathymetry are excluded so that bottom drag is the sole mechanism available to dissipate the upscale EKE transfer. The authors show that EKE is dissipated preferentially at small scales near the surface via frontal instabilities associated with LOB and a forward energy cascade rather than by bottom drag after an inverse energy cascade. This is true both with and without forcing by the wind. These results suggest that LOB caused by frontal instabilities near the ocean surface could provide an efficient mechanism, independent of boundary effects, by which EKE is dissipated. Ageostrophic anticyclonic instability is the dominant frontal instability mechanism in these simulations. Symmetric instability is also important in a ?deep convection? region, where it can be sustained by buoyancy loss.
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      Energy Cascades and Loss of Balance in a Reentrant Channel Forced by Wind Stress and Buoyancy Fluxes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226809
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    contributor authorBarkan, Roy
    contributor authorWinters, Kraig B.
    contributor authorLlewellyn Smith, Stefan G.
    date accessioned2017-06-09T17:20:47Z
    date available2017-06-09T17:20:47Z
    date copyright2015/01/01
    date issued2014
    identifier issn0022-3670
    identifier otherams-83570.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226809
    description abstractlarge fraction of the kinetic energy in the ocean is stored in the ?quasigeostrophic? eddy field. This ?balanced? eddy field is expected, according to geostrophic turbulence theory, to transfer energy to larger scales. In order for the general circulation to remain approximately steady, instability mechanisms leading to loss of balance (LOB) have been hypothesized to take place so that the eddy kinetic energy (EKE) may be transferred to small scales where it can be dissipated. This study examines the kinetic energy pathways in fully resolved direct numerical simulations of flow in a flat-bottomed reentrant channel, externally forced by surface buoyancy fluxes and wind stress in a configuration that resembles the Antarctic Circumpolar Current. The flow is allowed to reach a statistical steady state at which point it exhibits both a forward and an inverse energy cascade. Flow interactions with irregular bathymetry are excluded so that bottom drag is the sole mechanism available to dissipate the upscale EKE transfer. The authors show that EKE is dissipated preferentially at small scales near the surface via frontal instabilities associated with LOB and a forward energy cascade rather than by bottom drag after an inverse energy cascade. This is true both with and without forcing by the wind. These results suggest that LOB caused by frontal instabilities near the ocean surface could provide an efficient mechanism, independent of boundary effects, by which EKE is dissipated. Ageostrophic anticyclonic instability is the dominant frontal instability mechanism in these simulations. Symmetric instability is also important in a ?deep convection? region, where it can be sustained by buoyancy loss.
    publisherAmerican Meteorological Society
    titleEnergy Cascades and Loss of Balance in a Reentrant Channel Forced by Wind Stress and Buoyancy Fluxes
    typeJournal Paper
    journal volume45
    journal issue1
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-14-0068.1
    journal fristpage272
    journal lastpage293
    treeJournal of Physical Oceanography:;2014:;Volume( 045 ):;issue: 001
    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