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dc.contributor.authorLankhorst, Matthias  Concept link
dc.contributor.authorFratantoni, David M.  Concept link
dc.contributor.authorOllitrault, Michel  Concept link
dc.contributor.authorRichardson, Philip L.  Concept link
dc.contributor.authorSend, Uwe  Concept link
dc.contributor.authorZenk, Walter  Concept link
dc.date.accessioned2009-10-02T18:04:19Z
dc.date.available2009-10-02T18:04:19Z
dc.date.issued2009-05-29
dc.identifier.urihttps://hdl.handle.net/1912/3017
dc.descriptionAuthor Posting. © The Author(s), 2009. 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 56 (2009): 1615-1632, doi:10.1016/j.dsr.2009.06.002.en_US
dc.description.abstractA comprehensive analysis of velocity data from subsurface floats in the northwestern tropical Atlantic at two depth layers is presented: one representing the Antarctic Intermediate Water (AAIW, pressure range 600–1050 dbar), the other the upper North Atlantic Deep Water (uNADW, pressure range 1200–2050 dbar). New data from three independent research programs are combined with previously available data to achieve blanket coverage in space for the AAIW layer, while coverage in the uNADW remains more intermittent. Results from the AAIW mainly confirm previous studies on the mean flow, namely the equatorial zonal and the boundary currents, but clarify details on pathways, mostly by virtue of the spatial data coverage that sets float observations apart from e. g. shipborne or mooring observations. Mean transports in each of five zonal equatorial current bands is found to be between 2.7 and 4.5 Sv. Pathways carrying AAIW northward beyond the North Brazil Undercurrent are clearly visible in the mean velocity field, in particular a northward transport of 3.7 Sv across 16° N between the Antilles islands and the Mid- Atlantic Ridge. New maps of Lagrangian eddy kinetic energy and integral time scales are presented to quantify mesoscale activity. For the uNADW, mean flow and mesoscale properties are discussed as data availability allows. Trajectories in the uNADWeast of the Lesser Antilles reveal interactions between the Deep Western Boundary Current (DWBC) and the basin interior, which can explain recent hydrographic observations of changes in composition of DWBC water along its southward flow.en_US
dc.description.sponsorshipMOVE was funded by the Bundesministerium fu¨r Bildung und Forschung (grants 03F0246A and 03F0377B) as well as by the Deutsche Forschungsgemeinschaft (grant SE815/21), NBC by the National Science Foundation through grants OCE 97-29765 and OCE 01-36477, and SAMBA was fully supported by Ifremer.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.relation.urihttps://doi.org/10.1016/j.dsr.2009.06.002
dc.subjectFloatsen_US
dc.subjectTropical Atlanticen_US
dc.subjectAntarctic Intermediate Wateren_US
dc.subjectNorth Atlantic Deep Waten_US
dc.subjectEquatorial currentsen_US
dc.titleThe mid-depth circulation of the northwestern tropical Atlantic observed by floatsen_US
dc.typePreprinten_US


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