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    Turbulent mixing in a far‐field plume during the transition to upwelling conditions : microstructure observations from an AUV

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    Supporting Information S1 (411Kb)
    Data Set S1 (131.5Kb)
    Data Set S2 (254.7Kb)
    Data Set S3 (125.6Kb)
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    Date
    2018-09-23
    Author
    Fisher, Alexander W.  Concept link
    Nidzieko, Nicholas J.  Concept link
    Scully, Malcolm E.  Concept link
    Chant, Robert J.  Concept link
    Hunter, Elias J.  Concept link
    Mazzini, Piero L. F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10791
    As published
    https://doi.org/10.1029/2018GL078543
    DOI
    10.1029/2018GL078543
    Keyword
     River plume; Upwelling; Turbulence; Autonomous underwater vehicle; Mixing 
    Abstract
    A REMUS 600 autonomous underwater vehicle was used to measure turbulent mixing within the far‐field Chesapeake Bay plume during the transition to upwelling. Prior to the onset of upwelling, the plume was mixed by a combination of energetic downwelling winds and bottom‐generated shear resulting in a two‐layer plume structure. Estimates of turbulent dissipation and buoyancy flux from a nose‐mounted microstructure system indicate that scalar exchange within the plume was patchy and transient, with direct wind mixing constrained to the near surface by stratification within the plume. Changing wind and tide conditions contributed to temporal variability. Following the separation of the upper plume from the coast, alongshore shear became a significant driver of mixing on the shoreward edge of the plume.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 45 (2018): 9765-9773, doi:10.1029/2018GL078543.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Geophysical Research Letters 45 (2018): 9765-9773
     

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