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dc.contributor.authorSilverthorne, Katherine E.
dc.contributor.authorToole, John M.
dc.date.accessioned2010-10-26T19:38:23Z
dc.date.available2010-10-26T19:38:23Z
dc.date.issued2009-04
dc.identifier.citationJournal of Physical Oceanography 39 (2009): 1035-1049en_US
dc.identifier.urihttp://hdl.handle.net/1912/4011
dc.descriptionAuthor Posting. © American Meteorological Society, 2009. 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 39 (2009): 1035-1049, doi:10.1175/2008JPO3920.1.en_US
dc.description.abstractSeasonal variability of near-inertial horizontal kinetic energy is examined using observations from a series of McLane Moored Profiler moorings located at 39°N, 69°W in the western North Atlantic Ocean in combination with a one-dimensional, depth-integrated kinetic energy model. The time-mean kinetic energy and shear vertical wavenumber spectra of the high-frequency motions at the mooring site are in reasonable agreement with the Garrett–Munk internal wave description. Time series of depth-dependent and depth-integrated near-inertial kinetic energy are calculated from available mooring data after filtering to isolate near-inertial-frequency motions. These data document a pronounced seasonal cycle featuring a wintertime maximum in the depth-integrated near-inertial kinetic energy deriving chiefly from the variability in the upper 500 m of the water column. The seasonal signal in the near-inertial kinetic energy is most prominent for motions with vertical wavelengths greater than 100 m but observable wintertime enhancement is seen down to wavelengths of the order of 10 m. Rotary vertical wavenumber spectra exhibit a dominance of clockwise-with-depth energy, indicative of downward energy propagation and implying a surface energy source. A simple depth-integrated near-inertial kinetic energy model consisting of a wind forcing term and a dissipation term captures the order of magnitude of the observed near-inertial kinetic energy as well as its seasonal cycle.en_US
dc.description.sponsorshipFunding to initiate the McLane Moored Profiler observations at Line W were provided by grants from the G. Unger Vetlesen Foundation and the Comer Charitable Fund to the Woods Hole Oceanographic Institution’s Ocean and Climate Change Institute. Ongoing moored observations at Line W are supported by the National Science Foundation (NSF Grant OCE-0241354).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttp://dx.doi.org/10.1175/2008JPO3920.1
dc.subjectKinetic energyen_US
dc.subjectInternal wavesen_US
dc.subjectIntraseasonal variabilityen_US
dc.subjectNorth Atlantic Oceanen_US
dc.subjectIn situ observationsen_US
dc.titleSeasonal kinetic energy variability of near-inertial motionsen_US
dc.typeArticleen_US
dc.identifier.doi10.1175/2008JPO3920.1


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