Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory
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...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.222.2495 2023-05-15T16:02:28+02:00 Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory Maxim Nikurashin Raffaele Ferrari The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.222.2495 http://www.gfdl.noaa.gov/cms-filesystem-action/user_files/m1n/2009jpo4199.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.222.2495 http://www.gfdl.noaa.gov/cms-filesystem-action/user_files/m1n/2009jpo4199.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.gfdl.noaa.gov/cms-filesystem-action/user_files/m1n/2009jpo4199.pdf text 2008 ftciteseerx 2016-01-07T18:22:09Z 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 highresolution 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 Text Drake Passage Southern Ocean Unknown Drake Passage Southern Ocean |
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English |
description |
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 highresolution 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 |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Maxim Nikurashin Raffaele Ferrari |
spellingShingle |
Maxim Nikurashin Raffaele Ferrari Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory |
author_facet |
Maxim Nikurashin Raffaele Ferrari |
author_sort |
Maxim Nikurashin |
title |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory |
title_short |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory |
title_full |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory |
title_fullStr |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory |
title_full_unstemmed |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Theory |
title_sort |
radiation and dissipation of internal waves generated by geostrophic motions impinging on small-scale topography: theory |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.222.2495 http://www.gfdl.noaa.gov/cms-filesystem-action/user_files/m1n/2009jpo4199.pdf |
geographic |
Drake Passage Southern Ocean |
geographic_facet |
Drake Passage Southern Ocean |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_source |
http://www.gfdl.noaa.gov/cms-filesystem-action/user_files/m1n/2009jpo4199.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.222.2495 http://www.gfdl.noaa.gov/cms-filesystem-action/user_files/m1n/2009jpo4199.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766398101890793472 |