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Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory

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dc.contributor.author Nikurashin, Maxim
dc.contributor.author Ferrari, Raffaele
dc.date.accessioned 2011-04-22T18:22:47Z
dc.date.available 2011-04-22T18:22:47Z
dc.date.issued 2009-10
dc.date.submitted 2008-12
dc.identifier.issn 1520-0485
dc.identifier.issn 0022-3670
dc.identifier.uri http://hdl.handle.net/1721.1/62299
dc.description.abstract Observations and inverse models suggest that small-scale turbulent mixing is enhanced in the Southern Ocean in regions above rough topography. The enhancement extends O(1) km above the topography, suggesting that mixing is supported by the breaking of gravity waves radiated from the ocean bottom. In this study, it is shown that the observed mixing rates can be sustained by internal waves generated by geostrophic motions flowing over bottom topography. Weakly nonlinear theory is used to describe the internal wave generation and the feedback of the waves on the zonally averaged flow. Vigorous inertial oscillations are driven at the ocean bottom by waves generated at steep topography. The wave radiation and dissipation at equilibrium is therefore the result of both geostrophic flow and inertial oscillations differing substantially from the classical lee-wave problem. The theoretical predictions are tested versus two-dimensional high-resolution numerical simulations with parameters representative of Drake Passage. This work suggests that mixing in Drake Passage can be supported by geostrophic motions impinging on rough topography rather than by barotropic tidal motions, as is commonly assumed. en_US
dc.description.sponsorship National Science Foundation (U.S.) (Grant No. OCE-6919248) en_US
dc.language.iso en_US
dc.publisher American Meteorological Society en_US
dc.relation.isversionof http://dx.doi.org/10.1175/2009jpo4199.1 en_US
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. en_US
dc.source American Meteorological Society en_US
dc.title Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory en_US
dc.type Article en_US
dc.identifier.citation Nikurashin, Maxim, and Raffaele Ferrari. “Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory.” J. Phys. Oceanogr. 40.5 (2010): 1055-1074. © 2010 American Meteorological Society en_US
dc.contributor.department Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences en_US
dc.contributor.approver Ferrari, Raffaele
dc.contributor.mitauthor Ferrari, Raffaele
dc.relation.journal Journal of Physical Oceanography en_US
dc.identifier.mitlicense PUBLISHER_POLICY en_US
dc.eprint.version Final published version en_US
dc.type.uri http://purl.org/eprint/type/JournalArticle en_US
eprint.status http://purl.org/eprint/status/PeerReviewed en_US
dspace.orderedauthors Nikurashin, Maxim; Ferrari, Raffaele en


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