Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean
Recent estimates from observations and inverse models indicate that turbulent mixing associated withinternal wave breaking is enhanced above rough topography in the Southern Ocean. In most regions of theocean, abyssal mixing has been primarily associated with radiation and breaking of internal tides...
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ftunivtasecite:oai:ecite.utas.edu.au:79716 2023-05-15T16:02:32+02:00 Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean Nikurashin, M Ferrari, R 2010 application/pdf https://doi.org/10.1175/2010JPO4315.1 http://ecite.utas.edu.au/79716 en eng Amer Meteorological Soc http://ecite.utas.edu.au/79716/1/nikurashin_ferrari_2010b.pdf http://dx.doi.org/10.1175/2010JPO4315.1 Nikurashin, M and Ferrari, R, Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean, Journal of Physical Oceanography, 40, (September) pp. 2025-2042. ISSN 0022-3670 (2010) [Refereed Article] http://ecite.utas.edu.au/79716 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2010 ftunivtasecite https://doi.org/10.1175/2010JPO4315.1 2019-12-13T21:45:09Z Recent estimates from observations and inverse models indicate that turbulent mixing associated withinternal wave breaking is enhanced above rough topography in the Southern Ocean. In most regions of theocean, abyssal mixing has been primarily associated with radiation and breaking of internal tides. In this study,it is shown that abyssal mixing in the Southern Ocean can be sustained by internal waves generated bygeostrophic motions that dominate abyssal flows in this region. Theory and fully nonlinear numerical simulationsare used to estimate the internal wave radiation and dissipation from lowered acoustic Doppler currentprofiler (LADCP), CTD, and topography data from two regions in the Southern Ocean: Drake Passage andthe southeast Pacific. The results show that radiation and dissipation of internal waves generated by geostrophicmotions reproduce the magnitude and distribution of dissipation previously inferred from finescale measurementsin the region, suggesting that it is one of the primary drivers of abyssal mixing in the SouthernOcean. Article in Journal/Newspaper Drake Passage Southern Ocean eCite UTAS (University of Tasmania) Drake Passage Pacific Southern Ocean Journal of Physical Oceanography 40 9 2025 2042 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Nikurashin, M Ferrari, R Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
Recent estimates from observations and inverse models indicate that turbulent mixing associated withinternal wave breaking is enhanced above rough topography in the Southern Ocean. In most regions of theocean, abyssal mixing has been primarily associated with radiation and breaking of internal tides. In this study,it is shown that abyssal mixing in the Southern Ocean can be sustained by internal waves generated bygeostrophic motions that dominate abyssal flows in this region. Theory and fully nonlinear numerical simulationsare used to estimate the internal wave radiation and dissipation from lowered acoustic Doppler currentprofiler (LADCP), CTD, and topography data from two regions in the Southern Ocean: Drake Passage andthe southeast Pacific. The results show that radiation and dissipation of internal waves generated by geostrophicmotions reproduce the magnitude and distribution of dissipation previously inferred from finescale measurementsin the region, suggesting that it is one of the primary drivers of abyssal mixing in the SouthernOcean. |
format |
Article in Journal/Newspaper |
author |
Nikurashin, M Ferrari, R |
author_facet |
Nikurashin, M Ferrari, R |
author_sort |
Nikurashin, M |
title |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean |
title_short |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean |
title_full |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean |
title_fullStr |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean |
title_full_unstemmed |
Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean |
title_sort |
radiation and dissipation of internal waves generated by geostrophic motions impinging on small-scale topography: application to the southern ocean |
publisher |
Amer Meteorological Soc |
publishDate |
2010 |
url |
https://doi.org/10.1175/2010JPO4315.1 http://ecite.utas.edu.au/79716 |
geographic |
Drake Passage Pacific Southern Ocean |
geographic_facet |
Drake Passage Pacific Southern Ocean |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_relation |
http://ecite.utas.edu.au/79716/1/nikurashin_ferrari_2010b.pdf http://dx.doi.org/10.1175/2010JPO4315.1 Nikurashin, M and Ferrari, R, Radiation and Dissipation of Internal Waves Generated by Geostrophic Motions Impinging on Small-Scale Topography: Application to the Southern Ocean, Journal of Physical Oceanography, 40, (September) pp. 2025-2042. ISSN 0022-3670 (2010) [Refereed Article] http://ecite.utas.edu.au/79716 |
op_doi |
https://doi.org/10.1175/2010JPO4315.1 |
container_title |
Journal of Physical Oceanography |
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40 |
container_issue |
9 |
container_start_page |
2025 |
op_container_end_page |
2042 |
_version_ |
1766398198830596096 |