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    Response to a steady poleward outflow. Part I : the linear, quasigeostrophic problem

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    2008jpo3999%2E1.pdf (3.111Mb)
    Date
    2009-07
    Author
    Durland, Theodore S.  Concept link
    Pedlosky, Joseph  Concept link
    Spall, Michael A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4001
    As published
    https://doi.org/10.1175/2008JPO3999.1
    DOI
    10.1175/2008JPO3999.1
    Keyword
     Coastal flows; Estuaries; Currents; Vorticity; Plumes 
    Abstract
    The response of a zonal channel to a uniform, switched-on but subsequently steady poleward outflow is presented. An eastward coastal current with a Kelvin wave’s cross-shore structure is found to be generated instantly upon initiation of the outflow. The current is essentially in geostrophic balance everywhere except for the vicinity of the outflow channel mouth, where the streamlines must cross planetary vorticity contours to feed the current. The adjustment of this region generates a plume that propagates westward at Rossby wave speeds. The cross-shore structure of the plume varies with longitude, and at any given longitude it evolves with time. The authors show that the plume evolution can be understood both conceptually and quantitatively as the westward propagation of the Kelvin current’s meridional spectrum, with each spectral element propagating at its own Rossby wave group velocity.
    Description
    Author Posting. © American Meteorological Society, 2009. 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 39 (2009): 1541-1550, doi:10.1175/2008JPO3999.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Physical Oceanography 39 (2009): 1541-1550
     
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