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dc.contributor.authorJoyce, Terrence M.  Concept link
dc.coverage.spatialCentral North Atlantic Ocean
dc.coverage.spatialAzores
dc.date.accessioned2007-02-08T19:49:26Z
dc.date.available2007-02-08T19:49:26Z
dc.date.issued1981-06
dc.identifier.citationJoyce, T. M. (1981). The influence of the mid-Atlantic ridge upon the circulation and the properties of the Mediterranean water southwest of the Azores. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/1488
dc.identifier.urihttps://hdl.handle.net/1912/1488
dc.descriptionOriginally published in Journal of Marine Research 39 (1981): 31-52en
dc.description.abstractThe warm, salty water influenced by the Mediterranean outfow can be observed at mid-depth throughout the Central North Atlantic Ocean. Katz (1970) first noted that rather than a gradual salinity decrease away from the source, large changes were observable over major topographic features such as the mid-Atlantic Ridge, despite the fact that the topography presented no direct physical barrier to the core layer. Two mechanisms are considered which can account for this sub-surface frontal transition: variable eddy diffusivity and horiontal shear induced by submarine topography. The structure of the actual geostrophic currents and water masses southwest of the Azores is explored with CTD, XBT, and float data collected in June 1977 aboard the R.V. Knorr. A CTD section normal to and crossing the ridge axis near 35N, 35W shows the thermocline to be domed up 200 m over the ridge axis compared with stations 200 km to either side. At 1000 meters depth a change in salinity of nearly 0.15% in the Mediterranean Water is observed to occur over a horizontal distance of 100-150 km, and is located west of the ridge near 38N and over the ridge axis near 34N. Near this transition two neutrally buoyant floats were tracked for a period of a day. CTD stations around and over a float at 810 meters depth showed the temperature and salinity intrusions to persist with time and horiontal space scales in excess of 15 hours and 4 km. If the currents observed SW of the Azores are representative of the general circulation of the region, they not only explain the water mass structure in the thermocline and Mediterranean Water but also point out that the historical data base of zonal hydrographic sections does not adequately resolve the baroclinic structure.en
dc.description.sponsorshipThe research program reported was supported by the Office of Naval Research, contract N00014-76-C-197 NR083-400 with the Woods Hole Oceanographic Institution.en
dc.format.extent1723042 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherWoods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Technical Reportsen
dc.relation.ispartofseriesWHOI-81-55en
dc.subjectMediterranean water southwest of the Azoresen
dc.subjectCTD section across the mid-Atlantic Ridgeen
dc.subjectFrontogenesis by horizontal shearsen
dc.subjectKnorr (Ship : 1970-) Cruise KN66en
dc.titleThe influence of the mid-Atlantic ridge upon the circulation and the properties of the Mediterranean water southwest of the Azoresen
dc.typeTechnical Reporten
dc.identifier.doi10.1575/1912/1488


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