The identification and tracking of Agulhas rings using satellite altimetry

 

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dc.contributor.author Taunton-Clark, John en_ZA
dc.date.accessioned 2016-08-24T12:59:52Z
dc.date.available 2016-08-24T12:59:52Z
dc.date.issued 1993 en_ZA
dc.identifier.citation Taunton-Clark, J. 1993. The identification and tracking of Agulhas rings using satellite altimetry. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/21515
dc.description Includes bibliographical references. en_ZA
dc.description.abstract The methods of analysing, interpreting and computing surf ace geostrophic currents from GEOSAT altimeter data are explained. These methods were implemented in an examination of GEOSAT altimeter data for the period 12 July 1988 to 13 May 1989 with application to the identification and tracking of Agulhas rings in the southeast Atlantic Ocean. A population of as many circulation features of as five anticyclonic (and cyclonic) annular form consistent with that reported for Agulhas rings was identified from the altimeter data. The positive identification of the same feature in subsequent repeat cycles was, however, difficult. The Verna ring was identified as it travelled approximately along the ground track of GEOSAT pass A 158. Its horizontal (approximately 200 km diameter) and vertical (>30 cm sea surface elevation) dimensions confirmed its identity as an Agulhas ring. The translation speed of the Verna ring along pass A 158 was determined as 6.8 cm·s⁻¹ consistent with the speeds reported in the literature. Surface geostrophic speeds calculated from the altimeter-derived sea surface slopes showed maximum anticyclonic speeds of nearly 40 cm·s⁻¹ toward the SW at the northern rim and 25 cm·s-1 toward the NE at the southern edge of the ring. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Oceanography en_ZA
dc.title The identification and tracking of Agulhas rings using satellite altimetry en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Oceanography en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Taunton-Clark, J. (1993). <i>The identification and tracking of Agulhas rings using satellite altimetry</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/21515 en_ZA
dc.identifier.chicagocitation Taunton-Clark, John. <i>"The identification and tracking of Agulhas rings using satellite altimetry."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 1993. http://hdl.handle.net/11427/21515 en_ZA
dc.identifier.vancouvercitation Taunton-Clark J. The identification and tracking of Agulhas rings using satellite altimetry. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 1993 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21515 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Taunton-Clark, John AB - The methods of analysing, interpreting and computing surf ace geostrophic currents from GEOSAT altimeter data are explained. These methods were implemented in an examination of GEOSAT altimeter data for the period 12 July 1988 to 13 May 1989 with application to the identification and tracking of Agulhas rings in the southeast Atlantic Ocean. A population of as many circulation features of as five anticyclonic (and cyclonic) annular form consistent with that reported for Agulhas rings was identified from the altimeter data. The positive identification of the same feature in subsequent repeat cycles was, however, difficult. The Verna ring was identified as it travelled approximately along the ground track of GEOSAT pass A 158. Its horizontal (approximately 200 km diameter) and vertical (>30 cm sea surface elevation) dimensions confirmed its identity as an Agulhas ring. The translation speed of the Verna ring along pass A 158 was determined as 6.8 cm·s⁻¹ consistent with the speeds reported in the literature. Surface geostrophic speeds calculated from the altimeter-derived sea surface slopes showed maximum anticyclonic speeds of nearly 40 cm·s⁻¹ toward the SW at the northern rim and 25 cm·s-1 toward the NE at the southern edge of the ring. DA - 1993 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1993 T1 - The identification and tracking of Agulhas rings using satellite altimetry TI - The identification and tracking of Agulhas rings using satellite altimetry UR - http://hdl.handle.net/11427/21515 ER - en_ZA


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