An investigation into the impacts of the Benguela Niño on rainfall over southern Africa

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dc.contributor.advisorReason, Chrisen_ZA
dc.contributor.authorHansingo, Kabumbween_ZA
dc.date.accessioned2014-08-13T19:49:05Z
dc.date.available2014-08-13T19:49:05Z
dc.date.issued2008en_ZA
dc.descriptionIncludes abstract.en_ZA
dc.descriptionIncludes bibliographical references (leaves 109-124).en_ZA
dc.description.abstractThe impacts of the Benguela Niño on southern African rainfall and circulation are investigated using an atmospheric general circulation model. The model used is the United Kingdom Met Office Hadley Centre Atmospheric General Circulation Model version 3 and experiments using idealizations of observed regional and remote SST anomalies during various Benguela Niño events were performed. It is found that SST forcing in tropical South East Atlantic induces a regional baroclinic response and that a Benguela Niño is capable of forcing anomalous wet conditions over western Angola on its own, via changes to uplift and evaporation over the SST forcing. It is also capable of forcing anomalous rainfall much further inland when the intensity is increased. An experiment with the tropical South East Atlantic SST anomaly shifted slightly further north produced a larger circulation and rainfall response in the model. Additional experiments with various SST anomalies in the South West Indian Ocean/central equatorial Pacific combined with those in the South East Atlantic were performed. These experiments are motivated by the fact that equatorial Pacific/South Indian Ocean SST anomalies of varying signs often occur at the same time as the Benguela Niño Events. The results suggest that depending on its sign, magnitude and location, SST forcing from the South West Indian Ocean may augment or oppose the southern African rainfall anomalies occurring during a Benguela Niño event to varying degree.en_ZA
dc.identifier.apacitationHansingo, K. (2008). <i>An investigation into the impacts of the Benguela Niño on rainfall over southern Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/6479en_ZA
dc.identifier.chicagocitationHansingo, Kabumbwe. <i>"An investigation into the impacts of the Benguela Niño on rainfall over southern Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 2008. http://hdl.handle.net/11427/6479en_ZA
dc.identifier.citationHansingo, K. 2008. An investigation into the impacts of the Benguela Niño on rainfall over southern Africa. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hansingo, Kabumbwe AB - The impacts of the Benguela Niño on southern African rainfall and circulation are investigated using an atmospheric general circulation model. The model used is the United Kingdom Met Office Hadley Centre Atmospheric General Circulation Model version 3 and experiments using idealizations of observed regional and remote SST anomalies during various Benguela Niño events were performed. It is found that SST forcing in tropical South East Atlantic induces a regional baroclinic response and that a Benguela Niño is capable of forcing anomalous wet conditions over western Angola on its own, via changes to uplift and evaporation over the SST forcing. It is also capable of forcing anomalous rainfall much further inland when the intensity is increased. An experiment with the tropical South East Atlantic SST anomaly shifted slightly further north produced a larger circulation and rainfall response in the model. Additional experiments with various SST anomalies in the South West Indian Ocean/central equatorial Pacific combined with those in the South East Atlantic were performed. These experiments are motivated by the fact that equatorial Pacific/South Indian Ocean SST anomalies of varying signs often occur at the same time as the Benguela Niño Events. The results suggest that depending on its sign, magnitude and location, SST forcing from the South West Indian Ocean may augment or oppose the southern African rainfall anomalies occurring during a Benguela Niño event to varying degree. DA - 2008 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 T1 - An investigation into the impacts of the Benguela Niño on rainfall over southern Africa TI - An investigation into the impacts of the Benguela Niño on rainfall over southern Africa UR - http://hdl.handle.net/11427/6479 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/6479
dc.identifier.vancouvercitationHansingo K. An investigation into the impacts of the Benguela Niño on rainfall over southern Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 2008 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/6479en_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.titleAn investigation into the impacts of the Benguela Niño on rainfall over southern Africaen_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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