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dc.contributor.authorKukulka, Tobias  Concept link
dc.contributor.authorPlueddemann, Albert J.  Concept link
dc.contributor.authorTrowbridge, John H.  Concept link
dc.contributor.authorSullivan, Peter P.  Concept link
dc.date.accessioned2011-08-29T16:19:33Z
dc.date.available2012-02-04T09:31:41Z
dc.date.issued2011-08-04
dc.identifier.citationJournal of Geophysical Research 116 (2011): C08005en_US
dc.identifier.urihttps://hdl.handle.net/1912/4789
dc.descriptionAuthor Posting. © American Geophysical Union, 2011. 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 116 (2011): C08005, doi:10.1029/2011JC006971.en_US
dc.description.abstractLangmuir circulation (LC) is a turbulent process driven by wind and surface waves that plays a key role in transferring momentum, heat, and mass in the oceanic surface layer. On the coastal shelves the largest-scale LC span the whole water column and thus couple the surface and bottom boundary layers and enhance turbulent mixing. Observations and large eddy simulations (LES) of a shallow coastal ocean demonstrate that these relatively large scale Langmuir cells are strongly influenced by crosswind tidal currents. Two mechanisms by which crosswind tidal shear may distort and disrupt Langmuir cells are proposed. The first mechanism involves cell shearing due to differential advection across the whole cell. For the second mechanism, middepth vertical LC currents advect sheared mean crosswind current, leading to the attraction of upwelling and downwelling regions, so that LC cells are unsustainable when both regions overlap. Scaling arguments indicate that LC cells are more susceptible to crosswind shear distortion for smaller LC surface velocity convergence and greater cell aspect ratio (vertical to horizontal LC scale), which is consistent with the results obtained from the observations and LES. These results imply that scaling of LC characteristics in a coastal ocean differs from that in the open ocean, which has important practical implications for parameterizing enhanced mixing due to LC.en_US
dc.description.sponsorshipThis research was supported by the Office of Naval Research through grant N00014‐06‐1‐0178 (A.P., J.T.). Author T.K. received support from Faculty Startup Funds of the University of Delaware College of Earth, Ocean, and Environment.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2011JC006971
dc.subjectLangmuir circulationen_US
dc.subjectBoundary layer dynamicsen_US
dc.subjectTidesen_US
dc.titleThe influence of crosswind tidal currents on Langmuir circulation in a shallow oceanen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2011JC006971


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