Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers
Author Posting. © American Meteorological Society, 2008. 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 38 (2008): 133–145, doi:10.1175/2007JPO3782.1. Five...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4041 2023-05-15T14:53:05+02:00 Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers Timmermans, Mary-Louise Toole, John M. Proshutinsky, Andrey Krishfield, Richard A. Plueddemann, Albert J. 2008-01 application/pdf https://hdl.handle.net/1912/4041 en_US eng American Meteorological Society https://doi.org/10.1175/2007JPO3782.1 Journal of Physical Oceanography 38 (2008): 133–145 https://hdl.handle.net/1912/4041 doi:10.1175/2007JPO3782.1 Journal of Physical Oceanography 38 (2008): 133–145 doi:10.1175/2007JPO3782.1 Arctic Eddies Profilers Stability Salinity Article 2008 ftwhoas https://doi.org/10.1175/2007JPO3782.1 2022-05-28T22:58:09Z Author Posting. © American Meteorological Society, 2008. 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 38 (2008): 133–145, doi:10.1175/2007JPO3782.1. Five ice-tethered profilers (ITPs), deployed between 2004 and 2006, have provided detailed potential temperature θ and salinity S profiles from 21 anticyclonic eddy encounters in the central Canada Basin of the Arctic Ocean. The 12–35-m-thick eddies have center depths between 42 and 69 m in the Arctic halocline, and are shallower and less dense than the majority of eddies observed previously in the central Canada Basin. They are characterized by anomalously cold θ and low stratification, and have horizontal scales on the order of, or less than, the Rossby radius of deformation (about 10 km). Maximum azimuthal speeds estimated from dynamic heights (assuming cyclogeostrophic balance) are between 9 and 26 cm s−1, an order of magnitude larger than typical ambient flow speeds in the central basin. Eddy θ–S and potential vorticity properties, as well as horizontal and vertical scales, are consistent with their formation by instability of a surface front at about 80°N that appears in historical CTD and expendable CTD (XCTD) measurements. This would suggest eddy lifetimes longer than 6 months. While the baroclinic instability of boundary currents cannot be ruled out as a generation mechanism, it is less likely since deeper eddies that would originate from the deeper-reaching boundary flows are not observed in the survey region. The engineering design work for the ITP was initiated by the Cecil H. and Ida M. Green Technology Innovation Program (an internal program at the Woods Hole Oceanographic Institution). Prototype development and construction were funded jointly by the U.S. National Science Foundation (NSF) Oceanographic Technology and Interdisciplinary Coordination Program and Office of Polar Programs (OPP) under Award ... Article in Journal/Newspaper Arctic Arctic Ocean canada basin Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Arctic Ocean Canada Ida ENVELOPE(170.483,170.483,-83.583,-83.583) Central Basin ENVELOPE(43.000,43.000,73.500,73.500) Journal of Physical Oceanography 38 1 133 145 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Arctic Eddies Profilers Stability Salinity |
spellingShingle |
Arctic Eddies Profilers Stability Salinity Timmermans, Mary-Louise Toole, John M. Proshutinsky, Andrey Krishfield, Richard A. Plueddemann, Albert J. Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers |
topic_facet |
Arctic Eddies Profilers Stability Salinity |
description |
Author Posting. © American Meteorological Society, 2008. 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 38 (2008): 133–145, doi:10.1175/2007JPO3782.1. Five ice-tethered profilers (ITPs), deployed between 2004 and 2006, have provided detailed potential temperature θ and salinity S profiles from 21 anticyclonic eddy encounters in the central Canada Basin of the Arctic Ocean. The 12–35-m-thick eddies have center depths between 42 and 69 m in the Arctic halocline, and are shallower and less dense than the majority of eddies observed previously in the central Canada Basin. They are characterized by anomalously cold θ and low stratification, and have horizontal scales on the order of, or less than, the Rossby radius of deformation (about 10 km). Maximum azimuthal speeds estimated from dynamic heights (assuming cyclogeostrophic balance) are between 9 and 26 cm s−1, an order of magnitude larger than typical ambient flow speeds in the central basin. Eddy θ–S and potential vorticity properties, as well as horizontal and vertical scales, are consistent with their formation by instability of a surface front at about 80°N that appears in historical CTD and expendable CTD (XCTD) measurements. This would suggest eddy lifetimes longer than 6 months. While the baroclinic instability of boundary currents cannot be ruled out as a generation mechanism, it is less likely since deeper eddies that would originate from the deeper-reaching boundary flows are not observed in the survey region. The engineering design work for the ITP was initiated by the Cecil H. and Ida M. Green Technology Innovation Program (an internal program at the Woods Hole Oceanographic Institution). Prototype development and construction were funded jointly by the U.S. National Science Foundation (NSF) Oceanographic Technology and Interdisciplinary Coordination Program and Office of Polar Programs (OPP) under Award ... |
format |
Article in Journal/Newspaper |
author |
Timmermans, Mary-Louise Toole, John M. Proshutinsky, Andrey Krishfield, Richard A. Plueddemann, Albert J. |
author_facet |
Timmermans, Mary-Louise Toole, John M. Proshutinsky, Andrey Krishfield, Richard A. Plueddemann, Albert J. |
author_sort |
Timmermans, Mary-Louise |
title |
Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers |
title_short |
Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers |
title_full |
Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers |
title_fullStr |
Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers |
title_full_unstemmed |
Eddies in the Canada Basin, Arctic Ocean, observed from ice-tethered profilers |
title_sort |
eddies in the canada basin, arctic ocean, observed from ice-tethered profilers |
publisher |
American Meteorological Society |
publishDate |
2008 |
url |
https://hdl.handle.net/1912/4041 |
long_lat |
ENVELOPE(170.483,170.483,-83.583,-83.583) ENVELOPE(43.000,43.000,73.500,73.500) |
geographic |
Arctic Arctic Ocean Canada Ida Central Basin |
geographic_facet |
Arctic Arctic Ocean Canada Ida Central Basin |
genre |
Arctic Arctic Ocean canada basin |
genre_facet |
Arctic Arctic Ocean canada basin |
op_source |
Journal of Physical Oceanography 38 (2008): 133–145 doi:10.1175/2007JPO3782.1 |
op_relation |
https://doi.org/10.1175/2007JPO3782.1 Journal of Physical Oceanography 38 (2008): 133–145 https://hdl.handle.net/1912/4041 doi:10.1175/2007JPO3782.1 |
op_doi |
https://doi.org/10.1175/2007JPO3782.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
38 |
container_issue |
1 |
container_start_page |
133 |
op_container_end_page |
145 |
_version_ |
1766324509526196224 |