Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach.

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dc.contributor.advisorLucas, Mikeen_ZA
dc.contributor.advisorTurnewitsch, Roberten_ZA
dc.contributor.authorThomalla, S Jen_ZA
dc.date.accessioned2014-08-13T19:44:48Z
dc.date.available2014-08-13T19:44:48Z
dc.date.issued2007en_ZA
dc.descriptionIncludes bibliographical references (leaves 228-270).en_ZA
dc.description.abstractSubtropical ocean gyres are typically characterised by low carbon export into the deep ocean. However, due to their large area, even relatively small average carbon export may be globally significant. Strong correlations observed between deep-sea organic carbon, calcite and opal suggest that mineral phases may enhance the export and survival of organic matter as it sinks (the 'ballast effect'). However, the processes underlying these correlations are not well understood and remain key uncertainties in models that predict global carbon cycling. To better constrain carbon and mineral export from the surface ocean of subtropical gyres, radioactive disequilibria between 234Th and 238U were used to estimate fluxes of particulate organic carbon (POe), calcite and opal in the North and South Atlantic subtropical gyres.en_ZA
dc.identifier.apacitationThomalla, S. J. (2007). <i>Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/6452en_ZA
dc.identifier.chicagocitationThomalla, S J. <i>"Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 2007. http://hdl.handle.net/11427/6452en_ZA
dc.identifier.citationThomalla, S. 2007. Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Thomalla, S J AB - Subtropical ocean gyres are typically characterised by low carbon export into the deep ocean. However, due to their large area, even relatively small average carbon export may be globally significant. Strong correlations observed between deep-sea organic carbon, calcite and opal suggest that mineral phases may enhance the export and survival of organic matter as it sinks (the 'ballast effect'). However, the processes underlying these correlations are not well understood and remain key uncertainties in models that predict global carbon cycling. To better constrain carbon and mineral export from the surface ocean of subtropical gyres, radioactive disequilibria between 234Th and 238U were used to estimate fluxes of particulate organic carbon (POe), calcite and opal in the North and South Atlantic subtropical gyres. DA - 2007 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 T1 - Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach TI - Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach UR - http://hdl.handle.net/11427/6452 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/6452
dc.identifier.vancouvercitationThomalla SJ. Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 2007 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/6452en_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.titleParticulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach.en_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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