Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod Pena-Molino, Beatriz Joyce, Terrence M. Toole, John M. 2011-09-01T18:06:56Z 2011-09-01T18:06:56Z 2011-07-20
dc.description Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 58 (2011): 1019-1030, doi:10.1016/j.dsr.2011.07.006. en_US
dc.description.abstract 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 1500m, where it was originally found, to 700m. 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 W in 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. en_US
dc.description.sponsorship Financial support for the early observations (2001-2004) was provided by the G. Unger Vetlesen Foundation. Observations collected as part of the Line Wprogram (2004-2008) were funded by the U.S. National Science Foundation (grants number OCE-0241354 and OCE-0726720) as well as funding from WHOI’s Ocean and Climate Change Institute. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.subject Deep Western Boundary Current en_US
dc.subject Labrador Sea Water en_US
dc.subject Variability en_US
dc.subject Transport en_US
dc.subject Potential vorticity en_US
dc.title Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod en_US
dc.type Preprint en_US
dspace.entity.type Publication
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