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    Observations of diurnal coastal-trapped waves with a thermocline-intensified velocity field

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    Article (3.138Mb)
    Date
    2019-07-16
    Author
    Schlosser, Tamara L.  Concept link
    Jones, Nicole L.  Concept link
    Musgrave, Ruth C.  Concept link
    Bluteau, Cynthia E.  Concept link
    Ivey, Gregory N.  Concept link
    Lucas, Andrew J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/24522
    As published
    https://doi.org/10.1175/JPO-D-18-0194.1
    DOI
    10.1175/JPO-D-18-0194.1
    Keyword
     Australia; Continental shelf/slope; Boundary currents; Dynamics; Waves, oceanic 
    Abstract
    Using 18 days of field observations, we investigate the diurnal (D1) frequency wave dynamics on the Tasmanian eastern continental shelf. At this latitude, the D1 frequency is subinertial and separable from the highly energetic near-inertial motion. We use a linear coastal-trapped wave (CTW) solution with the observed background current, stratification, and shelf bathymetry to determine the modal structure of the first three resonant CTWs. We associate the observed D1 velocity with a superimposed mode-zero and mode-one CTW, with mode one dominating mode zero. Both the observed and mode-one D1 velocity was intensified near the thermocline, with stronger velocities occurring when the thermocline stratification was stronger and/or the thermocline was deeper (up to the shelfbreak depth). The CTW modal structure and amplitude varied with the background stratification and alongshore current, with no spring–neap relationship evident for the observed 18 days. Within the surface and bottom Ekman layers on the shelf, the observed velocity phase changed in the cross-shelf and/or vertical directions, inconsistent with an alongshore propagating CTW. In the near-surface and near-bottom regions, the linear CTW solution also did not match the observed velocity, particularly within the bottom Ekman layer. Boundary layer processes were likely causing this observed inconsistency with linear CTW theory. As linear CTW solutions have an idealized representation of boundary dynamics, they should be cautiously applied on the shelf.
    Description
    Author Posting. © American Meteorological Society, 2019. 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 49(7), (2019): 1973-1994, doi: 10.1175/JPO-D-18-0194.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Schlosser, T. L., Jones, N. L., Musgrave, R. C., Bluteau, C. E., Ivey, G. N., & Lucas, A. J. (2019). Observations of diurnal coastal-trapped waves with a thermocline-intensified velocity field. Journal of Physical Oceanography, 49(7), 1973-1994.
     
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