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Energy Flux and Dissipation in Luzon Strait: Two Tales of Two Ridges

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dc.creator Alford, Matthew H.
dc.creator MacKinnon, Jennifer A.
dc.creator Nash, Jonathan D.
dc.creator Simmons, Harper
dc.creator Pickering, Andy
dc.creator Klymak, Jody M.
dc.creator Pinkel, Robert
dc.creator Sun, Oliver
dc.creator Rainville, Luc
dc.creator Musgrave, Ruth
dc.creator Beitzel, Tamara
dc.creator Fu, Ke-Hsien
dc.creator Lu, Chung-Wei
dc.date.accessioned 2012-11-12T19:19:17Z
dc.date.available 2012-11-12T19:19:17Z
dc.date.issued 2011-11
dc.identifier.citation Alford, M., Musgrave, R., Beitzel, T., Fu, K., Lu, C., MacKinnon, J., . . . . (2011). Energy flux and dissipation in luzon strait: Two tales of two ridges. Journal of Physical Oceanography, 41(11), 2211-2222. doi: 10.1175/JPO-D-11-073.1 en_US
dc.identifier.uri http://hdl.handle.net/1957/35043
dc.description This is the publisher’s final pdf. The published article is copyrighted by American Meteorological Society and can be found at: http://www.ametsoc.org/. en_US
dc.description.abstract Internal tide generation, propagation, and dissipation are investigated in Luzon Strait, a system of two quasi-parallel ridges situated between Taiwan and the Philippines. Two profiling moorings deployed for about 20 days and a set of nineteen 36-h lowered ADCP-CTD time series stations allowed separate measurement of diurnal and semidiurnal internal tide signals. Measurements were concentrated on a northern line, where the ridge spacing was approximately equal to the mode-1 wavelength for semidiurnal motions, and a southern line, where the spacing was approximately two-thirds that. The authors contrast the two sites to emphasize the potential importance of resonance between generation sites. Throughout Luzon Strait, baroclinic energy, energy fluxes, and turbulent dissipation were some of the strongest ever measured. Peak-to-peak baroclinic velocity and vertical displacements often exceeded 2 m s⁻¹ and 300 m, respectively. Energy fluxes exceeding 60 kW m⁻¹ were measured at spring tide at the western end of the southern line. On the northern line, where the western ridge generates appreciable eastward-moving signals, net energy flux between the ridges was much smaller, exhibiting a nearly standing wave pattern. Overturns tens to hundreds of meters high were observed at almost all stations. Associated dissipation was elevated in the bottom 500-1000 m but was strongest by far atop the western ridge on the northern line, where >500-m overturns resulted in dissipation exceeding 2 x 10⁻⁶ W kg⁻¹ (implying diapycnal diffusivity K[subscript p] > 0.2 m² s⁻¹). Integrated dissipation at this location is comparable to conversion and flux divergence terms in the energy budget. The authors speculate that resonance between the two ridges may partly explain the energetic motions and heightened dissipation. en_US
dc.description.sponsorship This work was supported by the Office of Naval Research underGrantsN00014-09-1-021, N00014-09-1-0273, N00014-09-1-0281, and N00014-09-1- 0274. en_US
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.ispartofseries Journal of Physical Oceanography en_US
dc.relation.ispartofseries Vol. 41 no. 11 en_US
dc.subject South China sea en_US
dc.subject Internal tide en_US
dc.subject Hawaiian ridge en_US
dc.subject Ocean en_US
dc.subject Topography en_US
dc.subject Propagation en_US
dc.subject Generation en_US
dc.subject Turbulence en_US
dc.subject Model en_US
dc.title Energy Flux and Dissipation in Luzon Strait: Two Tales of Two Ridges en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.1175/JPO-D-11-073.1

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