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    Intrusion of warm Bering/Chukchi waters onto the shelf in the western Beaufort Sea

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    2008JC004870.pdf (1.316Mb)
    Date
    2009-06-27
    Author
    Okkonen, Stephen R.  Concept link
    Ashjian, Carin J.  Concept link
    Campbell, Robert G.  Concept link
    Maslowski, Wieslaw  Concept link
    Clement-Kinney, Jaclyn L.  Concept link
    Potter, Rachel  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3678
    As published
    https://doi.org/10.1029/2008JC004870
    DOI
    10.1029/2008JC004870
    Keyword
    Beaufort index
    Abstract
    Wind-driven changes in the path of warm Bering/Chukchi waters carried by the Alaska Coastal Current (ACC) through Barrow Canyon during late summer are described from high-resolution hydrography, acoustic Doppler current profiler–measured currents, and satellite-measured sea surface temperature imagery acquired from mid-August to mid-September 2005–2007 near Barrow, Alaska. Numerical simulations are used to provide a multidecadal context for these observational data. Four generalized wind regimes and associated circulation states are identified. When winds are from the east or east-southeast, the ACC jet tends to be relatively strong and flows adjacent to the shelf break along the southern flank of Barrow Canyon. These easterly winds drive inner shelf currents northwestward along the Alaskan Beaufort coast where they oppose significant eastward intrusions of warm water from Barrow Canyon onto the shelf. Because these easterly winds promote sea level set down over the Beaufort shelf and upwelling along the Beaufort slope, the ACC jet necessarily becomes weaker, broader, and displaced seaward from the Beaufort shelf break upon exiting Barrow Canyon. Winds from the northeast promote separation of the ACC from the southern flank of Barrow Canyon and establish an up-canyon current along the southern flank that is fed in part by waters from the western Beaufort shelf. When winds are weak or from the southwest, warm Bering/Chukchi waters from Barrow Canyon intrude onto the western Beaufort shelf.
    Description
    Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 114 (2009): C00A11, doi:10.1029/2008JC004870.
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    • Biology
    Suggested Citation
    Journal of Geophysical Research 114 (2009): C00A11
     

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