Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod
Water properties measured by the central mooring in the Line W mooring array southeast of Cape Cod document a large character shift during the period of November 2001 to April 2008. The observed temperature, salinity and planetary potential vorticity (PPV) anomalies manifest changes in the formation...
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ftunivtasecite:oai:ecite.utas.edu.au:78157 2023-05-15T17:06:00+02:00 Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod Pena-Molino, B Joyce, TM Toole, JM 2011 application/pdf https://doi.org/10.1016/j.dsr.2011.07.006 http://ecite.utas.edu.au/78157 en eng Pergamon-Elsevier Science Ltd http://ecite.utas.edu.au/78157/1/Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod.pdf http://dx.doi.org/10.1016/j.dsr.2011.07.006 Pena-Molino, B and Joyce, TM and Toole, JM, Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod, Deep-Sea Research. Part 1: Oceanographic Research Papers, 58, (10) pp. 1019-1030. ISSN 0967-0637 (2011) [Refereed Article] http://ecite.utas.edu.au/78157 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.1016/j.dsr.2011.07.006 2019-12-13T21:44:00Z Water properties measured by the central mooring in the Line W mooring array southeast of Cape Cod document a large character shift during the period of November 2001 to April 2008. The observed temperature, salinity and planetary potential vorticity (PPV) anomalies manifest changes in the formation region of the water masses present at Station W, specifically upper Labrador Sea Water (uLSW), deep Labrador Sea Water (dLSW) and Overflow Water (OW). During the observation period, the minimum in the PPV anomaly field relative to the record mean PPV profile migrated from 1500 m, where it was originally found, to 700 m. Temporal changes in the vertical distribution of temperature and salinity were correlated with the PPV changes. This suggests a dLSW-dominated first half of the record versus an uLSW-dominated second half. The structure of these anomalies is consistent with observations within the Labrador Sea, and their transit time to Line W agrees well with tracer-derived times for signals spreading along the western boundary. In that context, the observed water properties at Line Win the early 2000s reflected the intense deep convection in the Labrador Sea in the mid-1990s, with less intense convection subsequently affecting lighter isopycnals. The observed velocity field is dominated by high-frequency (periods of days to months) fluctuations, however, a fraction of the velocity variability is correlated with changes in water mass properties, and indicate a gradual acceleration of the southwestward flow, with a corresponding increase in Deep Western Boundary Current transport. Article in Journal/Newspaper Labrador Sea eCite UTAS (University of Tasmania) Deep Sea Research Part I: Oceanographic Research Papers 58 10 1019 1030 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Pena-Molino, B Joyce, TM Toole, JM Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
Water properties measured by the central mooring in the Line W mooring array southeast of Cape Cod document a large character shift during the period of November 2001 to April 2008. The observed temperature, salinity and planetary potential vorticity (PPV) anomalies manifest changes in the formation region of the water masses present at Station W, specifically upper Labrador Sea Water (uLSW), deep Labrador Sea Water (dLSW) and Overflow Water (OW). During the observation period, the minimum in the PPV anomaly field relative to the record mean PPV profile migrated from 1500 m, where it was originally found, to 700 m. Temporal changes in the vertical distribution of temperature and salinity were correlated with the PPV changes. This suggests a dLSW-dominated first half of the record versus an uLSW-dominated second half. The structure of these anomalies is consistent with observations within the Labrador Sea, and their transit time to Line W agrees well with tracer-derived times for signals spreading along the western boundary. In that context, the observed water properties at Line Win the early 2000s reflected the intense deep convection in the Labrador Sea in the mid-1990s, with less intense convection subsequently affecting lighter isopycnals. The observed velocity field is dominated by high-frequency (periods of days to months) fluctuations, however, a fraction of the velocity variability is correlated with changes in water mass properties, and indicate a gradual acceleration of the southwestward flow, with a corresponding increase in Deep Western Boundary Current transport. |
format |
Article in Journal/Newspaper |
author |
Pena-Molino, B Joyce, TM Toole, JM |
author_facet |
Pena-Molino, B Joyce, TM Toole, JM |
author_sort |
Pena-Molino, B |
title |
Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod |
title_short |
Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod |
title_full |
Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod |
title_fullStr |
Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod |
title_full_unstemmed |
Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod |
title_sort |
recent changes in the labrador sea water within the deep western boundary current southeast of cape cod |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2011 |
url |
https://doi.org/10.1016/j.dsr.2011.07.006 http://ecite.utas.edu.au/78157 |
genre |
Labrador Sea |
genre_facet |
Labrador Sea |
op_relation |
http://ecite.utas.edu.au/78157/1/Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod.pdf http://dx.doi.org/10.1016/j.dsr.2011.07.006 Pena-Molino, B and Joyce, TM and Toole, JM, Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod, Deep-Sea Research. Part 1: Oceanographic Research Papers, 58, (10) pp. 1019-1030. ISSN 0967-0637 (2011) [Refereed Article] http://ecite.utas.edu.au/78157 |
op_doi |
https://doi.org/10.1016/j.dsr.2011.07.006 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
58 |
container_issue |
10 |
container_start_page |
1019 |
op_container_end_page |
1030 |
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