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    Mechanisms of tidal oscillatory salt transport in a partially stratified estuary

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    jpo-d-15-0031%2E1.pdf (2.928Mb)
    Date
    2015-11
    Author
    Wang, Tao  Concept link
    Geyer, W. Rockwell  Concept link
    Engel, Patricia A.  Concept link
    Jiang, Wensheng  Concept link
    Feng, Shizuo  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7685
    As published
    https://doi.org/10.1175/JPO-D-15-0031.1
    DOI
    10.1175/JPO-D-15-0031.1
    Keyword
     Geographic location/entity; Estuaries; Circulation/ Dynamics; Baroclinic flows; Dispersion; Shear structure/flows; Atm/Ocean Structure/ Phenomena; Diapycnal mixing; Models and modeling; Regional models 
    Abstract
    Tidal oscillatory salt transport, induced by the correlation between tidal variations in salinity and velocity, is an important term for the subtidal salt balance under the commonly used Eulerian method of salt transport decomposition. In this paper, its mechanisms in a partially stratified estuary are investigated with a numerical model of the Hudson estuary. During neap tides, when the estuary is strongly stratified, the tidal oscillatory salt transport is mainly due to the hydraulic response of the halocline to the longitudinal variation of topography. This mechanism does not involve vertical mixing, so it should not be regarded as oscillatory shear dispersion, but instead it should be regarded as advective transport of salt, which results from the vertical distortion of exchange flow obtained in the Eulerian decomposition by vertical fluctuations of the halocline. During spring tides, the estuary is weakly stratified, and vertical mixing plays a significant role in the tidal variation of salinity. In the spring tide regime, the tidal oscillatory salt transport is mainly due to oscillatory shear dispersion. In addition, the transient lateral circulation near large channel curvature causes the transverse tilt of the halocline. This mechanism has little effect on the cross-sectionally integrated tidal oscillatory salt transport, but it results in an apparent left–right cross-channel asymmetry of tidal oscillatory salt transport. With the isohaline framework, tidal oscillatory salt transport can be regarded as a part of the net estuarine salt transport, and the Lagrangian advective mechanism and dispersive mechanism can be distinguished.
    Description
    Author Posting. © American Meteorological Society, 2015. 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 45 (2015): 2773–2789, doi:10.1175/JPO-D-15-0031.1.
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    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of Physical Oceanography 45 (2015): 2773–2789
     

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