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dc.contributor.authorLedwell, James R.  Concept link
dc.contributor.authorSt. Laurent, Louis C.  Concept link
dc.contributor.authorGirton, James B.  Concept link
dc.contributor.authorToole, John M.  Concept link
dc.date.accessioned2011-03-22T16:38:38Z
dc.date.available2011-07-01T08:25:28Z
dc.date.issued2011-01
dc.identifier.citationJournal of Physical Oceanography 41 (2011): 241-246en_US
dc.identifier.urihttps://hdl.handle.net/1912/4409
dc.descriptionAuthor Posting. © American Meteorological Society, 2011. 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 41 (2011): 241-246, doi:10.1175/2010JPO4557.1.en_US
dc.description.abstractThe vertical dispersion of a tracer released on a density surface near 1500-m depth in the Antarctic Circumpolar Current west of Drake Passage indicates that the diapycnal diffusivity, averaged over 1 yr and over tens of thousands of square kilometers, is (1.3 ± 0.2) × 10−5 m2 s−1. Diapycnal diffusivity estimated from turbulent kinetic energy dissipation measurements about the area occupied by the tracer in austral summer 2010 was somewhat less, but still within a factor of 2, at (0.75 ± 0.07) × 10−5 m2 s−1. Turbulent diapycnal mixing of this intensity is characteristic of the midlatitude ocean interior, where the energy for mixing is believed to derive from internal wave breaking. Indeed, despite the frequent and intense atmospheric forcing experienced by the Southern Ocean, the amplitude of finescale velocity shear sampled about the tracer was similar to background amplitudes in the midlatitude ocean, with levels elevated to only 20%–50% above the Garrett–Munk reference spectrum. These results add to a long line of evidence that diapycnal mixing in the interior middepth ocean is weak and is likely too small to dictate the middepth meridional overturning circulation of the ocean.en_US
dc.description.sponsorshipThis material is based upon work supported by the National Science Foundation Grants OCE-0622825,OCE-0622670, OCE-0622630, and OCE-0623177.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/2010JPO4557.1
dc.subjectDiapycnal mixingen_US
dc.subjectCurrentsen_US
dc.subjectAntarcticaen_US
dc.subjectOcean circulationen_US
dc.subjectMeridional overturning circulationen_US
dc.titleDiapycnal mixing in the Antarctic Circumpolar Currenten_US
dc.typeArticleen_US
dc.identifier.doi10.1175/2010JPO4557.1


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