Wind shear and differential upwelling along the South Western tip of Africa

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dc.contributor.advisorBrundrit, Geoff Ben_ZA
dc.contributor.advisorKeen, Cecil Sen_ZA
dc.contributor.authorJury, Mark Roberten_ZA
dc.date.accessioned2016-11-14T06:56:13Z
dc.date.available2016-11-14T06:56:13Z
dc.date.issued1984en_ZA
dc.description.abstractAlong the SW tip of Africa (30-35° S, 17-20° E) topographic irregularities shear the wind stress field giving rise to coastal upwelling with an alongshore variability. The relationship between wind shear and differential upwelling is established using a blend of oceanographic and meteorological investigations. Mesoscale aerial survey case studies form the observational basis from which the spatial variations in winds and upwelling are compared. Coastal winds, controlled by the pressure gradient between the South Atlantic Anticyclone and a summertime interior low, become modulated through interactions with the circumpolar jet stream. Low level winds accelerate over portions of the southern Benguela current region through deflections forced by three pronounced capes, two with mountain ridges exceeding 1000 m. Selected case studies are utilized to contrast the characteristics of deep and shallow wind flow, and the exposed and sheltered offshore regions. The spatial variability of the low level wind and sea surface temperature fields is correlated by means of aerial survey techniques applied at alongshore spacings of 10 to 50 km. Vertical transect and profile data collected at altitudes up to 1 km illustrate the variable depth of wind flow. Vertical wind shear controls the interaction of topography and winds. Field results show that vertical shears of -2 (10⁻²)s⁻¹ produce horizontal wind vorticities of -6 (10⁻⁴)s⁻¹ and alongshore sea surface temperature gradients of 1°C (10km)⁻¹ , a characteristic of summertime upwelling in the southern Benguela region.en_ZA
dc.identifier.apacitationJury, M. R. (1984). <i>Wind shear and differential upwelling along the South Western tip of Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/22522en_ZA
dc.identifier.chicagocitationJury, Mark Robert. <i>"Wind shear and differential upwelling along the South Western tip of Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 1984. http://hdl.handle.net/11427/22522en_ZA
dc.identifier.citationJury, M. 1984. Wind shear and differential upwelling along the South Western tip of Africa. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Jury, Mark Robert AB - Along the SW tip of Africa (30-35° S, 17-20° E) topographic irregularities shear the wind stress field giving rise to coastal upwelling with an alongshore variability. The relationship between wind shear and differential upwelling is established using a blend of oceanographic and meteorological investigations. Mesoscale aerial survey case studies form the observational basis from which the spatial variations in winds and upwelling are compared. Coastal winds, controlled by the pressure gradient between the South Atlantic Anticyclone and a summertime interior low, become modulated through interactions with the circumpolar jet stream. Low level winds accelerate over portions of the southern Benguela current region through deflections forced by three pronounced capes, two with mountain ridges exceeding 1000 m. Selected case studies are utilized to contrast the characteristics of deep and shallow wind flow, and the exposed and sheltered offshore regions. The spatial variability of the low level wind and sea surface temperature fields is correlated by means of aerial survey techniques applied at alongshore spacings of 10 to 50 km. Vertical transect and profile data collected at altitudes up to 1 km illustrate the variable depth of wind flow. Vertical wind shear controls the interaction of topography and winds. Field results show that vertical shears of -2 (10⁻²)s⁻¹ produce horizontal wind vorticities of -6 (10⁻⁴)s⁻¹ and alongshore sea surface temperature gradients of 1°C (10km)⁻¹ , a characteristic of summertime upwelling in the southern Benguela region. DA - 1984 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1984 T1 - Wind shear and differential upwelling along the South Western tip of Africa TI - Wind shear and differential upwelling along the South Western tip of Africa UR - http://hdl.handle.net/11427/22522 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22522
dc.identifier.vancouvercitationJury MR. Wind shear and differential upwelling along the South Western tip of Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 1984 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22522en_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.titleWind shear and differential upwelling along the South Western tip of 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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