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Zonal circulation across 52°W in the North Atlantic

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dc.contributor.author Hall, Melinda M.
dc.contributor.author Joyce, Terrence M.
dc.contributor.author Pickart, Robert S.
dc.contributor.author Smethie, William M.
dc.contributor.author Torres, Daniel J.
dc.date.accessioned 2010-06-04T18:27:11Z
dc.date.available 2010-06-04T18:27:11Z
dc.date.issued 2004-11-18
dc.identifier.citation Journal of Geophysical Research 109 (2004): C11008 en_US
dc.identifier.uri http://hdl.handle.net/1912/3582
dc.description Author 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.abstract In 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.sponsorship This work was supported by NSF grants OCE95-29607, OCE 95-31864, OCE98-18266, and OCE-0219644. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2003JC002103
dc.subject North Atlantic Circulation en_US
dc.subject Gulf Stream en_US
dc.subject Deep Western Boundary Current en_US
dc.title Zonal circulation across 52°W in the North Atlantic en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2003JC002103


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