Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage
Direct measurements of oceanic turbulent parameters were taken upstream of and across Drake Passage, in the region of the Subantarctic and Polar Fronts. Values of turbulent kinetic energy dissipation rate ε estimated by microstructure are up to two orders of magnitude lower than previously published...
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2015
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ftmit:oai:dspace.mit.edu:1721.1/106308 2023-06-11T04:11:19+02:00 Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage Laurent, Louis St. Owens, Breck Thurnherr, Andreas M. Toole, John M. Merrifield, Sophia Tiare Merrifield, Sophia Tiare 2015-04 application/pdf http://hdl.handle.net/1721.1/106308 en_US eng American Meteorological Society http://dx.doi.org/10.1175/jpo-d-15-0068.1 Journal of Physical Oceanography 0022-3670 1520-0485 http://hdl.handle.net/1721.1/106308 Merrifield, Sophia T. et al. “Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage.” Journal of Physical Oceanography 46.4 (2016): 1309–1321. © 2016 American Meteorological Society orcid:0000-0002-4152-7285 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. American Meteorological Society Article http://purl.org/eprint/type/JournalArticle 2015 ftmit https://doi.org/10.1175/jpo-d-15-0068.1 2023-05-29T08:40:28Z Direct measurements of oceanic turbulent parameters were taken upstream of and across Drake Passage, in the region of the Subantarctic and Polar Fronts. Values of turbulent kinetic energy dissipation rate ε estimated by microstructure are up to two orders of magnitude lower than previously published estimates in the upper 1000 m. Turbulence levels in Drake Passage are systematically higher than values upstream, regardless of season. The dissipation of thermal variance χ is enhanced at middepth throughout the surveys, with the highest values found in northern Drake Passage, where water mass variability is the most pronounced. Using the density ratio, evidence for double-diffusive instability is presented. Subject to double-diffusive physics, the estimates of diffusivity using the Osborn–Cox method are larger than ensemble statistics based on ε and the buoyancy frequency. National Science Foundation (U.S.) Article in Journal/Newspaper Drake Passage DSpace@MIT (Massachusetts Institute of Technology) Drake Passage Osborn ENVELOPE(-120.378,-120.378,56.604,56.604) Journal of Physical Oceanography 46 4 1309 1321 |
institution |
Open Polar |
collection |
DSpace@MIT (Massachusetts Institute of Technology) |
op_collection_id |
ftmit |
language |
English |
description |
Direct measurements of oceanic turbulent parameters were taken upstream of and across Drake Passage, in the region of the Subantarctic and Polar Fronts. Values of turbulent kinetic energy dissipation rate ε estimated by microstructure are up to two orders of magnitude lower than previously published estimates in the upper 1000 m. Turbulence levels in Drake Passage are systematically higher than values upstream, regardless of season. The dissipation of thermal variance χ is enhanced at middepth throughout the surveys, with the highest values found in northern Drake Passage, where water mass variability is the most pronounced. Using the density ratio, evidence for double-diffusive instability is presented. Subject to double-diffusive physics, the estimates of diffusivity using the Osborn–Cox method are larger than ensemble statistics based on ε and the buoyancy frequency. National Science Foundation (U.S.) |
author2 |
Merrifield, Sophia Tiare |
format |
Article in Journal/Newspaper |
author |
Laurent, Louis St. Owens, Breck Thurnherr, Andreas M. Toole, John M. Merrifield, Sophia Tiare |
spellingShingle |
Laurent, Louis St. Owens, Breck Thurnherr, Andreas M. Toole, John M. Merrifield, Sophia Tiare Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage |
author_facet |
Laurent, Louis St. Owens, Breck Thurnherr, Andreas M. Toole, John M. Merrifield, Sophia Tiare |
author_sort |
Laurent, Louis St. |
title |
Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage |
title_short |
Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage |
title_full |
Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage |
title_fullStr |
Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage |
title_full_unstemmed |
Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage |
title_sort |
enhanced diapycnal diffusivity in intrusive regions of the drake passage |
publisher |
American Meteorological Society |
publishDate |
2015 |
url |
http://hdl.handle.net/1721.1/106308 |
long_lat |
ENVELOPE(-120.378,-120.378,56.604,56.604) |
geographic |
Drake Passage Osborn |
geographic_facet |
Drake Passage Osborn |
genre |
Drake Passage |
genre_facet |
Drake Passage |
op_source |
American Meteorological Society |
op_relation |
http://dx.doi.org/10.1175/jpo-d-15-0068.1 Journal of Physical Oceanography 0022-3670 1520-0485 http://hdl.handle.net/1721.1/106308 Merrifield, Sophia T. et al. “Enhanced Diapycnal Diffusivity in Intrusive Regions of the Drake Passage.” Journal of Physical Oceanography 46.4 (2016): 1309–1321. © 2016 American Meteorological Society orcid:0000-0002-4152-7285 |
op_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. |
op_doi |
https://doi.org/10.1175/jpo-d-15-0068.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
46 |
container_issue |
4 |
container_start_page |
1309 |
op_container_end_page |
1321 |
_version_ |
1768386273211318272 |