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    The Cascade of Tidal Energy from Low to High Modes on a Continental Slope

    Source: Journal of Physical Oceanography:;2012:;Volume( 042 ):;issue: 007::page 1217
    Author:
    Kelly, Samuel M.
    ,
    Nash, Jonathan D.
    ,
    Martini, Kim I.
    ,
    Alford, Matthew H.
    ,
    Kunze, Eric
    DOI: 10.1175/JPO-D-11-0231.1
    Publisher: American Meteorological Society
    Abstract: he linear transfer of tidal energy from large to small scales is quantified for small tidal excursion over a near-critical continental slope. A theoretical framework for low-wavenumber energy transfer is derived from ?flat bottom? vertical modes and evaluated with observations from the Oregon continental slope. To better understand the observations, local tidal dynamics are modeled with a superposition of two idealized numerical simulations, one forced by local surface-tide velocities and the other by an obliquely incident internal tide generated at the Mendocino Escarpment 315 km southwest of the study site. The simulations reproduce many aspects of the observed internal tide and verify the modal-energy balances. Observed transfer of tidal energy into high-mode internal tides is quantitatively consistent with observed turbulent kinetic energy (TKE) dissipation. Locally generated and incident simulated internal tides are superposed with varying phase shifts to mimic the effects of the temporally varying mesoscale. Altering the phase of the incident internal tide alters (i) internal-tide energy flux, (ii) internal-tide generation, and (iii) energy conversion to high modes, suggesting that tidally driven TKE dissipation may vary between 0 and 500 watts per meter of coastline on 3?5-day time scales. Comparison of observed in situ internal-tide generation and satellite-derived estimates of surface-tide energy loss is inconclusive.
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      The Cascade of Tidal Energy from Low to High Modes on a Continental Slope

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    contributor authorKelly, Samuel M.
    contributor authorNash, Jonathan D.
    contributor authorMartini, Kim I.
    contributor authorAlford, Matthew H.
    contributor authorKunze, Eric
    date accessioned2017-06-09T17:19:14Z
    date available2017-06-09T17:19:14Z
    date copyright2012/07/01
    date issued2012
    identifier issn0022-3670
    identifier otherams-83117.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226307
    description abstracthe linear transfer of tidal energy from large to small scales is quantified for small tidal excursion over a near-critical continental slope. A theoretical framework for low-wavenumber energy transfer is derived from ?flat bottom? vertical modes and evaluated with observations from the Oregon continental slope. To better understand the observations, local tidal dynamics are modeled with a superposition of two idealized numerical simulations, one forced by local surface-tide velocities and the other by an obliquely incident internal tide generated at the Mendocino Escarpment 315 km southwest of the study site. The simulations reproduce many aspects of the observed internal tide and verify the modal-energy balances. Observed transfer of tidal energy into high-mode internal tides is quantitatively consistent with observed turbulent kinetic energy (TKE) dissipation. Locally generated and incident simulated internal tides are superposed with varying phase shifts to mimic the effects of the temporally varying mesoscale. Altering the phase of the incident internal tide alters (i) internal-tide energy flux, (ii) internal-tide generation, and (iii) energy conversion to high modes, suggesting that tidally driven TKE dissipation may vary between 0 and 500 watts per meter of coastline on 3?5-day time scales. Comparison of observed in situ internal-tide generation and satellite-derived estimates of surface-tide energy loss is inconclusive.
    publisherAmerican Meteorological Society
    titleThe Cascade of Tidal Energy from Low to High Modes on a Continental Slope
    typeJournal Paper
    journal volume42
    journal issue7
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-11-0231.1
    journal fristpage1217
    journal lastpage1232
    treeJournal of Physical Oceanography:;2012:;Volume( 042 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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