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    Direct Evidence of an Oceanic Inverse Kinetic Energy Cascade from Satellite Altimetry

    Source: Journal of Physical Oceanography:;2005:;Volume( 035 ):;issue: 009::page 1650
    Author:
    Scott, Robert B.
    ,
    Wang, Faming
    DOI: 10.1175/JPO2771.1
    Publisher: American Meteorological Society
    Abstract: Sea surface height measurements from satellites reveal the turbulent properties of the South Pacific Ocean surface geostrophic circulation, both supporting and challenging different aspects of geostrophic turbulence theory. A near-universal shape of the spectral kinetic energy flux is found and provides direct evidence of a source of kinetic energy near to or smaller than the deformation radius, consistent with linear instability theory. The spectral kinetic energy flux also reveals a net inverse cascade (i.e., a cascade to larger spatial scale), consistent with two-dimensional turbulence phenomenology. However, stratified geostrophic turbulence theory predicts an inverse cascade for the barotropic mode only; energy in the large-scale baroclinic modes undergoes a direct cascade toward the first-mode deformation scale. Thus if the surface geostrophic flow is predominately the first baroclinic mode, as expected for oceanic stratification profiles, then the observed inverse cascade contradicts geostrophic turbulence theory. The latter interpretation is argued for. Furthermore, and consistent with this interpretation, the inverse cascade arrest scale does not follow the Rhines arrest scale, as one would expect for the barotropic mode. A tentative revision of theory is proposed that would resolve the conflicts; however, further observations and idealized modeling experiments are needed to confirm, or refute, the revision. It is noted that no inertial range was found for the inverse cascade range of the spectrum, implying inertial range scaling, such as the established K?5/3 slope in the spectral kinetic energy density plot, is not applicable to the surface geostrophic flow.
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      Direct Evidence of an Oceanic Inverse Kinetic Energy Cascade from Satellite Altimetry

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    contributor authorScott, Robert B.
    contributor authorWang, Faming
    date accessioned2017-06-09T17:17:52Z
    date available2017-06-09T17:17:52Z
    date copyright2005/09/01
    date issued2005
    identifier issn0022-3670
    identifier otherams-82649.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4225786
    description abstractSea surface height measurements from satellites reveal the turbulent properties of the South Pacific Ocean surface geostrophic circulation, both supporting and challenging different aspects of geostrophic turbulence theory. A near-universal shape of the spectral kinetic energy flux is found and provides direct evidence of a source of kinetic energy near to or smaller than the deformation radius, consistent with linear instability theory. The spectral kinetic energy flux also reveals a net inverse cascade (i.e., a cascade to larger spatial scale), consistent with two-dimensional turbulence phenomenology. However, stratified geostrophic turbulence theory predicts an inverse cascade for the barotropic mode only; energy in the large-scale baroclinic modes undergoes a direct cascade toward the first-mode deformation scale. Thus if the surface geostrophic flow is predominately the first baroclinic mode, as expected for oceanic stratification profiles, then the observed inverse cascade contradicts geostrophic turbulence theory. The latter interpretation is argued for. Furthermore, and consistent with this interpretation, the inverse cascade arrest scale does not follow the Rhines arrest scale, as one would expect for the barotropic mode. A tentative revision of theory is proposed that would resolve the conflicts; however, further observations and idealized modeling experiments are needed to confirm, or refute, the revision. It is noted that no inertial range was found for the inverse cascade range of the spectrum, implying inertial range scaling, such as the established K?5/3 slope in the spectral kinetic energy density plot, is not applicable to the surface geostrophic flow.
    publisherAmerican Meteorological Society
    titleDirect Evidence of an Oceanic Inverse Kinetic Energy Cascade from Satellite Altimetry
    typeJournal Paper
    journal volume35
    journal issue9
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO2771.1
    journal fristpage1650
    journal lastpage1666
    treeJournal of Physical Oceanography:;2005:;Volume( 035 ):;issue: 009
    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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