An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa

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dc.contributor.advisorReason, Chrisen_ZA
dc.contributor.authorMpheshea, Lerato Elizabethen_ZA
dc.date.accessioned2014-11-05T03:58:12Z
dc.date.available2014-11-05T03:58:12Z
dc.date.issued2014en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractThe region below the 5ᵒS latitude is defined here as southern Africa. This region is subject to high inter-annual rainfall variability attributed to the local and remote SST fluctuations. The main purpose of this study is to investigate the unique impact that SST conditions related to ENSO, Benguela Niño and subtropical Indian Ocean Dipole (SIOD) has on summer rainfall over southern Africa. To achieve this, a partial correlation method was employed to analyse the possible relationship between rainfall variability and interannual SST variability in the Niño3.4 index, Angola-Benguela front and SIOD index for the climatological period between 1950 and 2010. The results revealed ENSO as a prime mode of rainfall variability in southern Africa. The ENSO-rainfall relationship in the central region of southern Africa tends to be modulated by the Benguela Niño and SIOD signal. In the west coast region of Namibia and Angola, the Benguela Niño was found to be strongly linked to rainfall variability. However, this Benguela Niño-rainfall relationship tends to weaken when the effect of ENSO and SIOD is removed. The SIOD impact on the rainfall was found to be dependent on ENSO.en_ZA
dc.identifier.apacitationMpheshea, L. E. (2014). <i>An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/9211en_ZA
dc.identifier.chicagocitationMpheshea, Lerato Elizabeth. <i>"An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 2014. http://hdl.handle.net/11427/9211en_ZA
dc.identifier.citationMpheshea, L. 2014. An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mpheshea, Lerato Elizabeth AB - The region below the 5ᵒS latitude is defined here as southern Africa. This region is subject to high inter-annual rainfall variability attributed to the local and remote SST fluctuations. The main purpose of this study is to investigate the unique impact that SST conditions related to ENSO, Benguela Niño and subtropical Indian Ocean Dipole (SIOD) has on summer rainfall over southern Africa. To achieve this, a partial correlation method was employed to analyse the possible relationship between rainfall variability and interannual SST variability in the Niño3.4 index, Angola-Benguela front and SIOD index for the climatological period between 1950 and 2010. The results revealed ENSO as a prime mode of rainfall variability in southern Africa. The ENSO-rainfall relationship in the central region of southern Africa tends to be modulated by the Benguela Niño and SIOD signal. In the west coast region of Namibia and Angola, the Benguela Niño was found to be strongly linked to rainfall variability. However, this Benguela Niño-rainfall relationship tends to weaken when the effect of ENSO and SIOD is removed. The SIOD impact on the rainfall was found to be dependent on ENSO. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa TI - An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa UR - http://hdl.handle.net/11427/9211 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/9211
dc.identifier.vancouvercitationMpheshea LE. An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9211en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Oceanographyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.titleAn investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africaen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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