Enhanced diapycnal diffusivity in intrusive regions of the Drake Passage
Author Posting. © American Meteorological Society, 2016. 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 46 (2016): 1309-1321, doi:10.1175/JPO-D-15-0068.1....
Published in: | Journal of Physical Oceanography |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Meteorological Society
2016
|
Subjects: | |
Online Access: | https://hdl.handle.net/1912/7980 |
id |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7980 |
---|---|
record_format |
openpolar |
spelling |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7980 2023-05-15T16:02:25+02:00 Enhanced diapycnal diffusivity in intrusive regions of the Drake Passage Merrifield, Sophia T. St. Laurent, Louis C. Owens, W. Brechner Thurnherr, Andreas M. Toole, John M. 2016-04-05 https://hdl.handle.net/1912/7980 en eng American Meteorological Society https://doi.org/10.1175/JPO-D-15-0068.1 Journal of Physical Oceanography 46 (2016): 1309-1321 https://hdl.handle.net/1912/7980 doi:10.1175/JPO-D-15-0068.1 Journal of Physical Oceanography 46 (2016): 1309-1321 doi:10.1175/JPO-D-15-0068.1 Geographic location/entity Southern Ocean Circulation/ Dynamics Diapycnal mixing Mixing Turbulence Atm/Ocean Structure/ Phenomena Fronts Observational techniques and algorithms Profilers oceanic Article 2016 ftwhoas https://doi.org/10.1175/JPO-D-15-0068.1 2022-05-28T22:59:34Z Author Posting. © American Meteorological Society, 2016. 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 46 (2016): 1309-1321, doi:10.1175/JPO-D-15-0068.1. 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. This work was supported by grants from the U.S. National Science Foundation. 2016-10-05 Article in Journal/Newspaper Drake Passage Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Southern Ocean Drake Passage Osborn ENVELOPE(-120.378,-120.378,56.604,56.604) Journal of Physical Oceanography 46 4 1309 1321 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Geographic location/entity Southern Ocean Circulation/ Dynamics Diapycnal mixing Mixing Turbulence Atm/Ocean Structure/ Phenomena Fronts Observational techniques and algorithms Profilers oceanic |
spellingShingle |
Geographic location/entity Southern Ocean Circulation/ Dynamics Diapycnal mixing Mixing Turbulence Atm/Ocean Structure/ Phenomena Fronts Observational techniques and algorithms Profilers oceanic Merrifield, Sophia T. St. Laurent, Louis C. Owens, W. Brechner Thurnherr, Andreas M. Toole, John M. Enhanced diapycnal diffusivity in intrusive regions of the Drake Passage |
topic_facet |
Geographic location/entity Southern Ocean Circulation/ Dynamics Diapycnal mixing Mixing Turbulence Atm/Ocean Structure/ Phenomena Fronts Observational techniques and algorithms Profilers oceanic |
description |
Author Posting. © American Meteorological Society, 2016. 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 46 (2016): 1309-1321, doi:10.1175/JPO-D-15-0068.1. 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. This work was supported by grants from the U.S. National Science Foundation. 2016-10-05 |
format |
Article in Journal/Newspaper |
author |
Merrifield, Sophia T. St. Laurent, Louis C. Owens, W. Brechner Thurnherr, Andreas M. Toole, John M. |
author_facet |
Merrifield, Sophia T. St. Laurent, Louis C. Owens, W. Brechner Thurnherr, Andreas M. Toole, John M. |
author_sort |
Merrifield, Sophia T. |
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 |
2016 |
url |
https://hdl.handle.net/1912/7980 |
long_lat |
ENVELOPE(-120.378,-120.378,56.604,56.604) |
geographic |
Southern Ocean Drake Passage Osborn |
geographic_facet |
Southern Ocean Drake Passage Osborn |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_source |
Journal of Physical Oceanography 46 (2016): 1309-1321 doi:10.1175/JPO-D-15-0068.1 |
op_relation |
https://doi.org/10.1175/JPO-D-15-0068.1 Journal of Physical Oceanography 46 (2016): 1309-1321 https://hdl.handle.net/1912/7980 doi:10.1175/JPO-D-15-0068.1 |
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_ |
1766398001861885952 |