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dc.contributor.authorHall, Melinda M.
dc.contributor.authorJoyce, Terrence M.
dc.contributor.authorPickart, Robert S.
dc.contributor.authorSmethie, William M.
dc.contributor.authorTorres, Daniel J.
dc.date.accessioned2010-06-04T18:27:11Z
dc.date.available2010-06-04T18:27:11Z
dc.date.issued2004-11-18
dc.identifier.citationJournal of Geophysical Research 109 (2004): C11008en_US
dc.identifier.urihttp://hdl.handle.net/1912/3582
dc.descriptionAuthor Posting. © American Geophysical Union, 2004. 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 109 (2004): C11008, doi:10.1029/2003JC002103.en_US
dc.description.abstractIn July–August 1997, a hydrographic/Acoustic Doppler Current Profiler (ADCP)/tracer section was occupied along 52°W in the North Atlantic as part of the World Ocean Circulation Experiment Hydrographic Program. Underway and lowered ADCP (LADCP) data have been used to reference geostrophic velocities calculated from the hydrographic data; additional (small) velocity adjustments provided by an inverse model, constraining mass and silicate transports in 17 neutral density layers, yield the absolute zonal velocity field for 52°W. We find a vigorous circulation throughout the entire section, with an unusually strong Gulf Stream (169 Sv) and southern Deep Western Boundary Current (DWBC; 64 Sv) at the time of the cruise. At the northern boundary, on the west side of the Grand Banks of Newfoundland, we find the westward flowing Labrador Current (8.6 Sv), whose continuity from the Labrador Sea, east of our section, has been disputed. Directly to the south we identify the slopewater current (12.5 Sv eastward) and northern DWBC (12.5 Sv westward). Strong departures from strictly zonal flow in the interior, which are found in the LADCP data, make it difficult to diagnose the circulation there. Isolated deep property extrema in the southern portion, associated with alternating bands of eastward and westward flow, are consistent with the idea that the rough topography of the Mid-Atlantic Ridge, directly east of our section, causes enhanced mixing of Antarctic Bottom Water properties into overlying waters with distinctly different properties. We calculate heat and freshwater fluxes crossing 52°W that exceed estimates based on air-sea exchanges by a factor of 1.7.en_US
dc.description.sponsorshipThis work was supported by NSF grants OCE95-29607, OCE 95-31864, OCE98-18266, and OCE-0219644.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttp://dx.doi.org/10.1029/2003JC002103
dc.subjectNorth Atlantic Circulationen_US
dc.subjectGulf Streamen_US
dc.subjectDeep Western Boundary Currenten_US
dc.titleZonal circulation across 52°W in the North Atlanticen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2003JC002103


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