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    Internal tidal modal ray refraction and energy ducting in baroclinic Gulf Stream currents

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    jpo-d-18-0031.1.pdf (7.347Mb)
    Date
    2018-08-30
    Author
    Duda, Timothy F.  Concept link
    Lin, Ying-Tsong  Concept link
    Buijsman, Maarten C.  Concept link
    Newhall, Arthur E.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10579
    As published
    https://doi.org/10.1175/JPO-D-18-0031.1
    DOI
    10.1175/JPO-D-18-0031.1
    Keyword
     Internal waves; Wave properties; Tides; Differential equations; Numerical analysis/modeling 
    Abstract
    Upstream mean semidiurnal internal tidal energy flux has been found in the Gulf Stream in hydrodynamical model simulations of the Atlantic Ocean. A major source of the energy in the simulations is the south edge of Georges Bank, where strong and resonant Gulf of Maine tidal currents are found. An explanation of the flux pattern within the Gulf Stream is that internal wave modal rays can be strongly redirected by baroclinic currents and even trapped (ducted) by current jets that feature strong velocities above the thermocline that are directed counter to the modal wavenumber vector (i.e., when the waves travel upstream). This ducting behavior is analyzed and explained here with ray-based wave propagation studies for internal wave modes with anisotropic wavenumbers, as occur in mesoscale background flow fields. Two primary analysis tools are introduced and then used to analyze the strong refraction and ducting: the generalized Jones equation governing modal properties and ray equations that are suitable for studying waves with anisotropic wavenumbers.
    Description
    Author Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 48 (2018): 1969-1993, doi:10.1175/JPO-D-18-0031.1.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of Physical Oceanography 48 (2018): 1969-1993
     

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