Vortices of the Mozambique ridge current

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dc.contributor.advisorBrundrit, Geoff Ben_ZA
dc.contributor.authorGründlingh, Marten Lutheren_ZA
dc.date.accessioned2016-11-10T06:50:14Z
dc.date.available2016-11-10T06:50:14Z
dc.date.issued1985en_ZA
dc.description.abstractDuring a cruise of the R.V. Meiring Naude in August 1975, anomalous values for temperature, salinity and nutrients were recorded over a deep-sea region of the Southwestern Indian Ocean. It was thought that this oceanographic anomaly may represent part of a cyclonic mesoscale vortex of unknown origin. The scant information available at the time on the circulation in this area precluded any of the known, steady currents from being possible generators. Only once before, in 1962, had a similar observation been made, and its significance had not been recognised. In the period 1976 to 1982, several hydrographic cruises were executed on the R.V. Meiring Naude in the region 27 - 33°S, 32 - 43°E, to locate similar features and to find answers to the following questions: Was the 1975 anomaly really a vortex (i.e. a rotating body of water)? What are the physical and dynamic characteristics (i.e. temperature, salinity, density, velocity, volume transport, energy) and distribution of such vortices? How and where are the vortices generated, and what are their lifetime and eventual fate? In all, more than 500 routine hydrographic stations were occupied to collect data on water properties. Most of these stations extended to a depth of 1 000 m, while about 20% went to at least 1 800 m. Initially, hydrosondes designed and built by the Council for Scientific and Industrial Research were employed, but a Neil Brown Instrument Systems' CTD (conductivity-temperature-depth) microprofiler was used from 1979 onwards. Satellite-tracked buoys and infrared imagery were used to derive information on the circulation patterns, thus extending the coverage of the small research vessel. The drift rate of the ship and current measurements from a drifting array of current meters augmented the calculations of geostrophic velocity, volume transport and energy, and provided insight into the flow dynamics of the water.en_ZA
dc.identifier.apacitationGründlingh, M. L. (1985). <i>Vortices of the Mozambique ridge current</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/22481en_ZA
dc.identifier.chicagocitationGründlingh, Marten Luther. <i>"Vortices of the Mozambique ridge current."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 1985. http://hdl.handle.net/11427/22481en_ZA
dc.identifier.citationGründlingh, M. 1985. Vortices of the Mozambique ridge current. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Gründlingh, Marten Luther AB - During a cruise of the R.V. Meiring Naude in August 1975, anomalous values for temperature, salinity and nutrients were recorded over a deep-sea region of the Southwestern Indian Ocean. It was thought that this oceanographic anomaly may represent part of a cyclonic mesoscale vortex of unknown origin. The scant information available at the time on the circulation in this area precluded any of the known, steady currents from being possible generators. Only once before, in 1962, had a similar observation been made, and its significance had not been recognised. In the period 1976 to 1982, several hydrographic cruises were executed on the R.V. Meiring Naude in the region 27 - 33°S, 32 - 43°E, to locate similar features and to find answers to the following questions: Was the 1975 anomaly really a vortex (i.e. a rotating body of water)? What are the physical and dynamic characteristics (i.e. temperature, salinity, density, velocity, volume transport, energy) and distribution of such vortices? How and where are the vortices generated, and what are their lifetime and eventual fate? In all, more than 500 routine hydrographic stations were occupied to collect data on water properties. Most of these stations extended to a depth of 1 000 m, while about 20% went to at least 1 800 m. Initially, hydrosondes designed and built by the Council for Scientific and Industrial Research were employed, but a Neil Brown Instrument Systems' CTD (conductivity-temperature-depth) microprofiler was used from 1979 onwards. Satellite-tracked buoys and infrared imagery were used to derive information on the circulation patterns, thus extending the coverage of the small research vessel. The drift rate of the ship and current measurements from a drifting array of current meters augmented the calculations of geostrophic velocity, volume transport and energy, and provided insight into the flow dynamics of the water. DA - 1985 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1985 T1 - Vortices of the Mozambique ridge current TI - Vortices of the Mozambique ridge current UR - http://hdl.handle.net/11427/22481 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22481
dc.identifier.vancouvercitationGründlingh ML. Vortices of the Mozambique ridge current. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 1985 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22481en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Oceanographyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherOceanographyen_ZA
dc.titleVortices of the Mozambique ridge currenten_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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