Absolute velocity along the AR7W section in the Labrador Sea
Author Posting. © Elsevier B.V., 2012. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87, doi:10.1016/j.dsr.2012.11.005. Nearly every spring since 1990, hydrographic data have been collected along a section in the Labrador Sea known as A...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5803 2023-05-15T17:06:03+02:00 Absolute velocity along the AR7W section in the Labrador Sea Hall, Melinda M. Torres, Daniel J. Yashayaev, Igor 2012-11-19 application/pdf https://hdl.handle.net/1912/5803 en_US eng Elsevier B.V. https://doi.org/10.1016/j.dsr.2012.11.005 Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87 https://hdl.handle.net/1912/5803 doi:10.1016/j.dsr.2012.11.005 Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87 doi:10.1016/j.dsr.2012.11.005 Labrador Sea Boundary currents Lowered acoustic doppler current profiler Ocean heat transport Geostrophic velocity Deep ocean circulation Meridional overturning Article 2012 ftwhoas https://doi.org/10.1016/j.dsr.2012.11.005 2022-05-28T22:58:47Z Author Posting. © Elsevier B.V., 2012. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87, doi:10.1016/j.dsr.2012.11.005. Nearly every spring since 1990, hydrographic data have been collected along a section in the Labrador Sea known as AR7W. Since 1995, lowered acoustic doppler current profiler (LADCP) data have also been collected. In this work we use data from six of these sections, spanning the time period 1995 through 2008, to determine absolute velocity across AR7W and analyze the main features of the general circulation in the area. We find that absolute velocity fields are characterized by strong, nearly barotropic flows all along the section, meaning there is no “level of no motion” for geostrophic velocity calculations. There is strong variability from year to year, especially in the strength of the boundary currents at each end; nevertheless, combining data from.all 6 sections yields a well-organized velocity field resembling that presented by Pickart and Spall (2007), except that our velocities tend to be stronger: there is a cyclonic boundary current system with offshore recirculations at both ends of the line; the interior is filled with virtually uniform, top-to-bottom bands of velocity with alternating signs. At the southwestern end of the section, the LADCP data reveal a dual core of the Labrador Current at times when horizontal resolution is adequate. At the northeastern end, the location of the recirculation offshore of the boundary current is bimodal, and hence the apparent width of the boundary current is bimodal as well. In the middle of the section, we have found a bottom current carrying overflow waters along the Northwest Atlantic Mid-Ocean Channel, suggesting one of various possible fast routes for those waters to reach the central Labrador Sea. We have used the hydrographic data to compute geostrophic velocities, referenced to the LADCP profiles, as well as to compute ocean heat transport across AR7W for four of our ... Article in Journal/Newspaper Labrador Sea Northwest Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Northwest Atlantic Mid-Ocean Channel ENVELOPE(-52.709,-52.709,58.577,58.577) Deep Sea Research Part I: Oceanographic Research Papers 72 72 87 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Labrador Sea Boundary currents Lowered acoustic doppler current profiler Ocean heat transport Geostrophic velocity Deep ocean circulation Meridional overturning |
spellingShingle |
Labrador Sea Boundary currents Lowered acoustic doppler current profiler Ocean heat transport Geostrophic velocity Deep ocean circulation Meridional overturning Hall, Melinda M. Torres, Daniel J. Yashayaev, Igor Absolute velocity along the AR7W section in the Labrador Sea |
topic_facet |
Labrador Sea Boundary currents Lowered acoustic doppler current profiler Ocean heat transport Geostrophic velocity Deep ocean circulation Meridional overturning |
description |
Author Posting. © Elsevier B.V., 2012. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87, doi:10.1016/j.dsr.2012.11.005. Nearly every spring since 1990, hydrographic data have been collected along a section in the Labrador Sea known as AR7W. Since 1995, lowered acoustic doppler current profiler (LADCP) data have also been collected. In this work we use data from six of these sections, spanning the time period 1995 through 2008, to determine absolute velocity across AR7W and analyze the main features of the general circulation in the area. We find that absolute velocity fields are characterized by strong, nearly barotropic flows all along the section, meaning there is no “level of no motion” for geostrophic velocity calculations. There is strong variability from year to year, especially in the strength of the boundary currents at each end; nevertheless, combining data from.all 6 sections yields a well-organized velocity field resembling that presented by Pickart and Spall (2007), except that our velocities tend to be stronger: there is a cyclonic boundary current system with offshore recirculations at both ends of the line; the interior is filled with virtually uniform, top-to-bottom bands of velocity with alternating signs. At the southwestern end of the section, the LADCP data reveal a dual core of the Labrador Current at times when horizontal resolution is adequate. At the northeastern end, the location of the recirculation offshore of the boundary current is bimodal, and hence the apparent width of the boundary current is bimodal as well. In the middle of the section, we have found a bottom current carrying overflow waters along the Northwest Atlantic Mid-Ocean Channel, suggesting one of various possible fast routes for those waters to reach the central Labrador Sea. We have used the hydrographic data to compute geostrophic velocities, referenced to the LADCP profiles, as well as to compute ocean heat transport across AR7W for four of our ... |
format |
Article in Journal/Newspaper |
author |
Hall, Melinda M. Torres, Daniel J. Yashayaev, Igor |
author_facet |
Hall, Melinda M. Torres, Daniel J. Yashayaev, Igor |
author_sort |
Hall, Melinda M. |
title |
Absolute velocity along the AR7W section in the Labrador Sea |
title_short |
Absolute velocity along the AR7W section in the Labrador Sea |
title_full |
Absolute velocity along the AR7W section in the Labrador Sea |
title_fullStr |
Absolute velocity along the AR7W section in the Labrador Sea |
title_full_unstemmed |
Absolute velocity along the AR7W section in the Labrador Sea |
title_sort |
absolute velocity along the ar7w section in the labrador sea |
publisher |
Elsevier B.V. |
publishDate |
2012 |
url |
https://hdl.handle.net/1912/5803 |
long_lat |
ENVELOPE(-52.709,-52.709,58.577,58.577) |
geographic |
Northwest Atlantic Mid-Ocean Channel |
geographic_facet |
Northwest Atlantic Mid-Ocean Channel |
genre |
Labrador Sea Northwest Atlantic |
genre_facet |
Labrador Sea Northwest Atlantic |
op_source |
Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87 doi:10.1016/j.dsr.2012.11.005 |
op_relation |
https://doi.org/10.1016/j.dsr.2012.11.005 Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87 https://hdl.handle.net/1912/5803 doi:10.1016/j.dsr.2012.11.005 |
op_doi |
https://doi.org/10.1016/j.dsr.2012.11.005 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
72 |
container_start_page |
72 |
op_container_end_page |
87 |
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1766060970307747840 |