Turbulence and diapycnal mixing in Drake Passage
Author Posting. © American Meteorological Society, 2012. 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 42 (2012): 2143–2152, doi:10.1175/JPO-D-12-027.1. D...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5752 2023-05-15T13:53:14+02:00 Turbulence and diapycnal mixing in Drake Passage St. Laurent, Louis C. Naveira Garabato, Alberto C. Ledwell, James R. Thurnherr, Andreas M. Toole, John M. Watson, Andrew J. 2012-12 application/pdf https://hdl.handle.net/1912/5752 en_US eng American Meteorological Society https://doi.org/10.1175/JPO-D-12-027.1 Journal of Physical Oceanography 42 (2012): 2143–2152 https://hdl.handle.net/1912/5752 doi:10.1175/JPO-D-12-027.1 Journal of Physical Oceanography 42 (2012): 2143–2152 doi:10.1175/JPO-D-12-027.1 Southern Ocean Turbulence Diapycnal mixing Article 2012 ftwhoas https://doi.org/10.1175/JPO-D-12-027.1 2022-05-28T22:58:47Z Author Posting. © American Meteorological Society, 2012. 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 42 (2012): 2143–2152, doi:10.1175/JPO-D-12-027.1. Direct measurements of turbulence levels in the Drake Passage region of the Southern Ocean show a marked enhancement over the Phoenix Ridge. At this site, the Antarctic Circumpolar Current (ACC) is constricted in its flow between the southern tip of South America and the northern tip of the Antarctic Peninsula. Observed turbulent kinetic energy dissipation rates are enhanced in the regions corresponding to the ACC frontal zones where strong flow reaches the bottom. In these areas, turbulent dissipation levels reach 10−8 W kg−1 at abyssal and middepths. The mixing enhancement in the frontal regions is sufficient to elevate the diapycnal turbulent diffusivity acting in the deep water above the axis of the ridge to 1 × 10−4 m2 s−1. This level is an order of magnitude larger than the mixing levels observed upstream in the ACC above smoother bathymetry. Outside of the frontal regions, dissipation rates are O(10−10) W kg−1, comparable to the background levels of turbulence found throughout most mid- and low-latitude regions of the global ocean. This work was supported by the U.S. National Science Foundation and by the Natural Environment Research Council of the United Kingdom. 2013-06-01 Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Southern Ocean The Antarctic Antarctic Peninsula Drake Passage Journal of Physical Oceanography 42 12 2143 2152 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Southern Ocean Turbulence Diapycnal mixing |
spellingShingle |
Southern Ocean Turbulence Diapycnal mixing St. Laurent, Louis C. Naveira Garabato, Alberto C. Ledwell, James R. Thurnherr, Andreas M. Toole, John M. Watson, Andrew J. Turbulence and diapycnal mixing in Drake Passage |
topic_facet |
Southern Ocean Turbulence Diapycnal mixing |
description |
Author Posting. © American Meteorological Society, 2012. 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 42 (2012): 2143–2152, doi:10.1175/JPO-D-12-027.1. Direct measurements of turbulence levels in the Drake Passage region of the Southern Ocean show a marked enhancement over the Phoenix Ridge. At this site, the Antarctic Circumpolar Current (ACC) is constricted in its flow between the southern tip of South America and the northern tip of the Antarctic Peninsula. Observed turbulent kinetic energy dissipation rates are enhanced in the regions corresponding to the ACC frontal zones where strong flow reaches the bottom. In these areas, turbulent dissipation levels reach 10−8 W kg−1 at abyssal and middepths. The mixing enhancement in the frontal regions is sufficient to elevate the diapycnal turbulent diffusivity acting in the deep water above the axis of the ridge to 1 × 10−4 m2 s−1. This level is an order of magnitude larger than the mixing levels observed upstream in the ACC above smoother bathymetry. Outside of the frontal regions, dissipation rates are O(10−10) W kg−1, comparable to the background levels of turbulence found throughout most mid- and low-latitude regions of the global ocean. This work was supported by the U.S. National Science Foundation and by the Natural Environment Research Council of the United Kingdom. 2013-06-01 |
format |
Article in Journal/Newspaper |
author |
St. Laurent, Louis C. Naveira Garabato, Alberto C. Ledwell, James R. Thurnherr, Andreas M. Toole, John M. Watson, Andrew J. |
author_facet |
St. Laurent, Louis C. Naveira Garabato, Alberto C. Ledwell, James R. Thurnherr, Andreas M. Toole, John M. Watson, Andrew J. |
author_sort |
St. Laurent, Louis C. |
title |
Turbulence and diapycnal mixing in Drake Passage |
title_short |
Turbulence and diapycnal mixing in Drake Passage |
title_full |
Turbulence and diapycnal mixing in Drake Passage |
title_fullStr |
Turbulence and diapycnal mixing in Drake Passage |
title_full_unstemmed |
Turbulence and diapycnal mixing in Drake Passage |
title_sort |
turbulence and diapycnal mixing in drake passage |
publisher |
American Meteorological Society |
publishDate |
2012 |
url |
https://hdl.handle.net/1912/5752 |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Drake Passage |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Drake Passage |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
op_source |
Journal of Physical Oceanography 42 (2012): 2143–2152 doi:10.1175/JPO-D-12-027.1 |
op_relation |
https://doi.org/10.1175/JPO-D-12-027.1 Journal of Physical Oceanography 42 (2012): 2143–2152 https://hdl.handle.net/1912/5752 doi:10.1175/JPO-D-12-027.1 |
op_doi |
https://doi.org/10.1175/JPO-D-12-027.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
42 |
container_issue |
12 |
container_start_page |
2143 |
op_container_end_page |
2152 |
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1766258244304502784 |