Seasonal kinetic energy variability of near-inertial motions


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dc.contributor.author Silverthorne, Katherine E.
dc.contributor.author Toole, John M.
dc.date.accessioned 2010-10-26T19:38:23Z
dc.date.available 2010-10-26T19:38:23Z
dc.date.issued 2009-04
dc.identifier.citation Journal of Physical Oceanography 39 (2009): 1035-1049 en_US
dc.identifier.uri http://hdl.handle.net/1912/4011
dc.description Author 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.abstract Seasonal 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.sponsorship Funding 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.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.uri http://dx.doi.org/10.1175/2008JPO3920.1
dc.subject Kinetic energy en_US
dc.subject Internal waves en_US
dc.subject Intraseasonal variability en_US
dc.subject North Atlantic Ocean en_US
dc.subject In situ observations en_US
dc.title Seasonal kinetic energy variability of near-inertial motions en_US
dc.type Article en_US
dc.identifier.doi 10.1175/2008JPO3920.1

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