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    Inhibited upper ocean restratification in nonequilibrium swell conditions

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    grl50708.pdf (349.3Kb)
    Date
    2013-07-30
    Author
    Kukulka, Tobias  Concept link
    Plueddemann, Albert J.  Concept link
    Sullivan, Peter P.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6231
    As published
    https://doi.org/10.1002/grl.50708
    DOI
    10.1002/grl.50708
    Keyword
     Swell; Upper ocean turbulence; Restratification; Diurinal heating; Langmuir turbulence; Langmuir circulation 
    Abstract
    Diurnal restratification of the ocean surface boundary layer (OSBL) represents a competition between mixing of the OSBL and solar heating. Langmuir turbulence (LT) is a mixing process in the OSBL, driven by wind and surface waves, that transfers momentum, heat, and mass. Observations in nonequilibrium swell conditions reveal that the OSBL does not restratify despite low winds and strong solar radiation. Motivated by observations, we use large-eddy simulations of the wave-averaged Navier-Stokes equations to show that LT is capable of inhibiting diurnal restratification of the OSBL. Incoming heat is redistributed vertically by LT, forming a warmer OSBL with a nearly uniform temperature. The inhibition of restratification is not reproduced by two common Reynolds-averaged Navier-Stokes equation models, highlighting the importance of properly representing sea-state dependent LT dynamics in OSBL models.
    Description
    Author Posting. © American Geophysical Union, 2013. 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 40 (2013): 3672–3676, doi:10.1002/grl.50708.
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    • Physical Oceanography (PO)
    Suggested Citation
    Geophysical Research Letters 40 (2013): 3672–3676
     

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