Tracking Labrador Sea Water property signals along the Deep Western Boundary Current
MetadataShow full item record
KeywordOcean observations; Deep Western Boundary Current; General circulation; Labrador Sea Water; Decadal variability; Line W
Observations of the Deep Western Boundary Current (DWBC) at Line W on the western North Atlantic continental slope southeast of Cape Cod from 1995 to 2014 reveal water mass changes that are consistent with changes in source water properties upstream in the Labrador Sea. This is most evident in the cold, dense, and deep class of Labrador Sea Water (dLSW) that was created and progressively replenished and deepened by recurring winter convection during the severe winters of 1987–1994. The arrival of this record cold, fresh, and low potential vorticity anomaly at Line W lags its formation in the Labrador Sea by 3–7 years. Complementary observations along the path of the DWBC provide further evidence that this anomaly is advected along the boundary and indicate that stirring between the boundary and the interior intensifies south of the Flemish Cap. Finally, the consistency of the data with realistic advective and mixing time scales is assessed using the Waugh and Hall (2005) model framework. The data are found to be best represented by a mean transit time of 5 years from the Labrador Sea to Line W, with a leading order role for both advection by the DWBC and mixing between the boundary flow and interior waters.
Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 122 (2017): 5348–5366, doi:10.1002/2017JC012921.
Suggested CitationArticle: Le Bras, Isabela A., Yashayaev, Igor, Toole, John M., "Tracking Labrador Sea Water property signals along the Deep Western Boundary Current", Journal of Geophysical Research: Oceans 122 (2017): 5348–5366, DOI:10.1002/2017JC012921, https://hdl.handle.net/1912/9264
Showing items related by title, author, creator and subject.
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. (2011-07-20)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 ...
Palter, Jaime B.; Lozier, M. Susan; Lavender, Kara L. (American Meteorological Society, 2008-05)Labrador Sea Water (LSW), a dense water mass formed by convection in the subpolar North Atlantic, is an important constituent of the meridional overturning circulation. Understanding how the water mass enters the deep ...
Time series measurements of transient tracers and tracer-derived transport in the Deep Western Boundary Current between the Labrador Sea and the subtropical Atlantic Ocean at Line W Smith, John N.; Smethie, William M.; Yashayaev, Igor; Curry, Ruth G.; Azetsu-Scott, Kumiko (John Wiley & Sons, 2016-11-10)Time series measurements of the nuclear fuel reprocessing tracer 129I and the gas ventilation tracer CFC-11 were undertaken on the AR7W section in the Labrador Sea (1997–2014) and on Line W (2004–2014), located over the ...