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    Seasonal Kinetic Energy Variability of Near-Inertial Motions

    Source: Journal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 004::page 1035
    Author:
    Silverthorne, Katherine E.
    ,
    Toole, John M.
    DOI: 10.1175/2008JPO3920.1
    Publisher: American Meteorological Society
    Abstract: Seasonal variability of near-inertial horizontal kinetic energy is examined using observations from a series of McLane Moored Profiler moorings located at 39°N, 69°W in the western North Atlantic Ocean in combination with a one-dimensional, depth-integrated kinetic energy model. The time-mean kinetic energy and shear vertical wavenumber spectra of the high-frequency motions at the mooring site are in reasonable agreement with the Garrett?Munk internal wave description. Time series of depth-dependent and depth-integrated near-inertial kinetic energy are calculated from available mooring data after filtering to isolate near-inertial-frequency motions. These data document a pronounced seasonal cycle featuring a wintertime maximum in the depth-integrated near-inertial kinetic energy deriving chiefly from the variability in the upper 500 m of the water column. The seasonal signal in the near-inertial kinetic energy is most prominent for motions with vertical wavelengths greater than 100 m but observable wintertime enhancement is seen down to wavelengths of the order of 10 m. Rotary vertical wavenumber spectra exhibit a dominance of clockwise-with-depth energy, indicative of downward energy propagation and implying a surface energy source. A simple depth-integrated near-inertial kinetic energy model consisting of a wind forcing term and a dissipation term captures the order of magnitude of the observed near-inertial kinetic energy as well as its seasonal cycle.
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      Seasonal Kinetic Energy Variability of Near-Inertial Motions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4208981
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    contributor authorSilverthorne, Katherine E.
    contributor authorToole, John M.
    date accessioned2017-06-09T16:25:12Z
    date available2017-06-09T16:25:12Z
    date copyright2009/04/01
    date issued2009
    identifier issn0022-3670
    identifier otherams-67524.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208981
    description abstractSeasonal variability of near-inertial horizontal kinetic energy is examined using observations from a series of McLane Moored Profiler moorings located at 39°N, 69°W in the western North Atlantic Ocean in combination with a one-dimensional, depth-integrated kinetic energy model. The time-mean kinetic energy and shear vertical wavenumber spectra of the high-frequency motions at the mooring site are in reasonable agreement with the Garrett?Munk internal wave description. Time series of depth-dependent and depth-integrated near-inertial kinetic energy are calculated from available mooring data after filtering to isolate near-inertial-frequency motions. These data document a pronounced seasonal cycle featuring a wintertime maximum in the depth-integrated near-inertial kinetic energy deriving chiefly from the variability in the upper 500 m of the water column. The seasonal signal in the near-inertial kinetic energy is most prominent for motions with vertical wavelengths greater than 100 m but observable wintertime enhancement is seen down to wavelengths of the order of 10 m. Rotary vertical wavenumber spectra exhibit a dominance of clockwise-with-depth energy, indicative of downward energy propagation and implying a surface energy source. A simple depth-integrated near-inertial kinetic energy model consisting of a wind forcing term and a dissipation term captures the order of magnitude of the observed near-inertial kinetic energy as well as its seasonal cycle.
    publisherAmerican Meteorological Society
    titleSeasonal Kinetic Energy Variability of Near-Inertial Motions
    typeJournal Paper
    journal volume39
    journal issue4
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2008JPO3920.1
    journal fristpage1035
    journal lastpage1049
    treeJournal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 004
    contenttypeFulltext
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