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    Interpreting Energy and Tracer Spectra of Upper-Ocean Turbulence in the Submesoscale Range (1–200 km)

    Source: Journal of Physical Oceanography:;2013:;Volume( 043 ):;issue: 011::page 2456
    Author:
    Callies, Jörn
    ,
    Ferrari, Raffaele
    DOI: 10.1175/JPO-D-13-063.1
    Publisher: American Meteorological Society
    Abstract: ubmesoscale (1?200 km) wavenumber spectra of kinetic and potential energy and tracer variance are obtained from in situ observations in the Gulf Stream region and in the eastern subtropical North Pacific. In the Gulf Stream region, steep kinetic energy spectra at scales between 200 and 20 km are consistent with predictions of interior quasigeostrophic?turbulence theory, both in the mixed layer and in the thermocline. At scales below 20 km, the spectra flatten out, consistent with a growing contribution of internal-wave energy at small scales. In the subtropical North Pacific, the energy spectra are flatter and inconsistent with predictions of interior quasigeostrophic?turbulence theory. The observed spectra and their dependence on depth are also inconsistent with predictions of surface quasigeostrophic?turbulence theory for the observed ocean stratification. It appears that unbalanced motions, most likely internal tides at large scales and the internal-wave continuum at small scales, dominate the energy spectrum throughout the submesoscale range. Spectra of temperature variance along density surfaces, which are not affected by internal tides, are also inconsistent with predictions of geostrophic-turbulence theories. Reasons for this inconsistency could be the injection of energy in the submesoscale range by small-scale baroclinic instabilities or modifications of the spectra by coupling between surface and interior dynamics or by ageostrophic frontal effects.
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      Interpreting Energy and Tracer Spectra of Upper-Ocean Turbulence in the Submesoscale Range (1–200 km)

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226732
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    contributor authorCallies, Jörn
    contributor authorFerrari, Raffaele
    date accessioned2017-06-09T17:20:30Z
    date available2017-06-09T17:20:30Z
    date copyright2013/11/01
    date issued2013
    identifier issn0022-3670
    identifier otherams-83501.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226732
    description abstractubmesoscale (1?200 km) wavenumber spectra of kinetic and potential energy and tracer variance are obtained from in situ observations in the Gulf Stream region and in the eastern subtropical North Pacific. In the Gulf Stream region, steep kinetic energy spectra at scales between 200 and 20 km are consistent with predictions of interior quasigeostrophic?turbulence theory, both in the mixed layer and in the thermocline. At scales below 20 km, the spectra flatten out, consistent with a growing contribution of internal-wave energy at small scales. In the subtropical North Pacific, the energy spectra are flatter and inconsistent with predictions of interior quasigeostrophic?turbulence theory. The observed spectra and their dependence on depth are also inconsistent with predictions of surface quasigeostrophic?turbulence theory for the observed ocean stratification. It appears that unbalanced motions, most likely internal tides at large scales and the internal-wave continuum at small scales, dominate the energy spectrum throughout the submesoscale range. Spectra of temperature variance along density surfaces, which are not affected by internal tides, are also inconsistent with predictions of geostrophic-turbulence theories. Reasons for this inconsistency could be the injection of energy in the submesoscale range by small-scale baroclinic instabilities or modifications of the spectra by coupling between surface and interior dynamics or by ageostrophic frontal effects.
    publisherAmerican Meteorological Society
    titleInterpreting Energy and Tracer Spectra of Upper-Ocean Turbulence in the Submesoscale Range (1–200 km)
    typeJournal Paper
    journal volume43
    journal issue11
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-063.1
    journal fristpage2456
    journal lastpage2474
    treeJournal of Physical Oceanography:;2013:;Volume( 043 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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