The influence of the Agulhas Current on two South African extreme weather events

 

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dc.contributor.advisor Rouault, Mathieu en_ZA
dc.contributor.author White, Sarah April en_ZA
dc.date.accessioned 2016-04-22T13:40:54Z
dc.date.available 2016-04-22T13:40:54Z
dc.date.issued 2000 en_ZA
dc.identifier.citation White, S. 2000. The influence of the Agulhas Current on two South African extreme weather events. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/19150
dc.description Includes bibliographical references. en_ZA
dc.description.abstract Surface station, satellite and NCEP re-analysis data are used to examine the evolution of two severe storms that occurred over the eastern coastal regions during South Africa's summer season 1998/99. The storms in November and December were both accompanied by heavy rainfall in two widely separated locations. The storm in December proved to be more severe as it resulted in flooding while tornadoes were reported in the Umtata and Hogsback regions of the Eastern Cape. Both storms appeared to result from interaction between a continental heat low, advection of warm moist air around an anticyclone in the South-west Indian Ocean and an approaching midlevel westerly trough. NCEP derived moisture flux diagrams and back trajectories of air parcels constructed from ECMWF data suggest that the Agulhas Current region was a major source of low level moisture for both storms. TRMM satellite imagery captured heavy rainfall above the high sea surface temperatures of the Agulhas Current. TRMM measurements of rainfall and latent heat in the atmosphere show that the high sea surface temperatures of the Agulhas Current modified the mesoscale environment above the current. To what extent the mesoscale environment above the Agulhas Current modified the synoptic situations over land could be answered using regional modeling and more frequent radiosonde data. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Oceanography en_ZA
dc.title The influence of the Agulhas Current on two South African extreme weather events 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 White, S. A. (2000). <i>The influence of the Agulhas Current on two South African extreme weather events</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/19150 en_ZA
dc.identifier.chicagocitation White, Sarah April. <i>"The influence of the Agulhas Current on two South African extreme weather events."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 2000. http://hdl.handle.net/11427/19150 en_ZA
dc.identifier.vancouvercitation White SA. The influence of the Agulhas Current on two South African extreme weather events. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 2000 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19150 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - White, Sarah April AB - Surface station, satellite and NCEP re-analysis data are used to examine the evolution of two severe storms that occurred over the eastern coastal regions during South Africa's summer season 1998/99. The storms in November and December were both accompanied by heavy rainfall in two widely separated locations. The storm in December proved to be more severe as it resulted in flooding while tornadoes were reported in the Umtata and Hogsback regions of the Eastern Cape. Both storms appeared to result from interaction between a continental heat low, advection of warm moist air around an anticyclone in the South-west Indian Ocean and an approaching midlevel westerly trough. NCEP derived moisture flux diagrams and back trajectories of air parcels constructed from ECMWF data suggest that the Agulhas Current region was a major source of low level moisture for both storms. TRMM satellite imagery captured heavy rainfall above the high sea surface temperatures of the Agulhas Current. TRMM measurements of rainfall and latent heat in the atmosphere show that the high sea surface temperatures of the Agulhas Current modified the mesoscale environment above the current. To what extent the mesoscale environment above the Agulhas Current modified the synoptic situations over land could be answered using regional modeling and more frequent radiosonde data. DA - 2000 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2000 T1 - The influence of the Agulhas Current on two South African extreme weather events TI - The influence of the Agulhas Current on two South African extreme weather events UR - http://hdl.handle.net/11427/19150 ER - en_ZA


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