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dc.contributor.authorPena-Molino, Beatriz  Concept link
dc.coverage.spatialDeep Western Boundary Current
dc.date.accessioned2010-11-12T20:25:05Z
dc.date.available2010-11-12T20:25:05Z
dc.date.issued2010-09
dc.identifier.urihttps://hdl.handle.net/1912/4080
dc.descriptionSubmitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2010en_US
dc.description.abstractThe variability in the DWBC, its connection to the forcing in the northern North Atlantic and interaction with the Gulf Stream were explored from a combination of remote sensing and in-situ measurements in the western North Atlantic. Using satellite altimetry and Sea Surface Temperature (SST) we found evidence of the relation between changes in the Gulf Stream path and the variability in the temperature and velocity fields in the Slope Water. This relation was such that southward shifts of the main axis of the Gulf Stream were preceded by cold temperature anomalies and intensification of the southwestward flow. The analysis of 5.5 years of moored CTD and horizontal velocity data in the DWBC at 69°W recorded during the period 2002-2008, showed that the variability along the DWBC is linked to changes in the dense water formation regions. The evolution of potential vorticity (PV) at the mooring site, characterized by a transition from deep to upper Labrador Sea Water (LSW), was similar to that observed in the Labrador Sea 6 to 9 years earlier, and imply spreading rates for the LSW that varied over time from 1.5 to 2.5cm/s. The time dependence of the spreading rates was in good agreement with changes in the strength of the DWBC at the mooring site. The evolution of the DWBC transport was explored in more detail from a 5-element moored array, also at 69°W. The results, for the period of 2004-2008, were consistent with the single mooring analysis. The variability measured from the array showed that upper, intermediate and deep water mass layers expand and contract at each other’s expense, leading to alternating positive and negative PV anomalies at the upper-LSW, deep-LSW and Overflow Water (OW). Larger DWBC transports were associated with enhanced presence of recently ventilated upper-LSW and OW, rather than deep-LSW. The relative contribution of the different water masses to the observed circulation was investigated by inverting individual PV anomalies isolated from the observations. We found that changes in the depth-integrated circulation were mostly driven by changes in the OW.en_US
dc.description.sponsorshipDuring the first two years, my time here was funded through a La Caixa Foundation fellowship as well as an MIT presidential fellowship. Financial support for my thesis work was provided by National Science Foundation grants OCE-0241354 and OCE-0726720. Support for traveling to meetings was also provided by the MIT Houghton Fund and the WHOI Academic Programs Office.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherMassachusetts Institute of Technology and Woods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Thesesen_US
dc.subjectOcean currentsen_US
dc.subjectOcean temperatureen_US
dc.subjectEndeavor (Ship: 1976-) Cruise EN256en_US
dc.subjectEndeavor (Ship: 1976-) Cruise EN257en_US
dc.subject440en_US
dc.subjectKnorr (Ship : 1970-) Cruise KN173-2en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC269en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC401en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC411en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC417en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC421en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC432en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC436en_US
dc.subjectOceanus (Ship : 1975-) Cruise OC446en_US
dc.titleVariability in the North Atlantic Deep Western Boundary Current : upstream causes and downstream effects as observed at Line Wen_US
dc.typeThesisen_US
dc.identifier.doi10.1575/1912/4080


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