Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study

 

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dc.contributor.advisor Jury, Mark R en_ZA
dc.contributor.advisor Brundrit, Geoff B en_ZA
dc.contributor.author Mpeta, Emmanuel Jonathan en_ZA
dc.date.accessioned 2016-05-13T09:35:55Z
dc.date.available 2016-05-13T09:35:55Z
dc.date.issued 1997 en_ZA
dc.identifier.citation Mpeta, E. 1997. Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/19650
dc.description.abstract Intraseasonal convection oscillation over the northeastern and southwestern Tanzania during MAM and DJF seasons respectively are examined using December, 1979 to May, 1994 pentad (5-day mean) Outgoing Longwave Radiation (OLR) as an indicator of convective cloud distribution. Area-averaged OLR indices are derived for the two areas. Time series of OLR indices for MAM and DJF indicate large quasi-periodic OLR fluctuations in some years and small fluctuations in other years. Periodogram analyses results reveal that dominant periodogram values for the oscillations were different in different years over both areas. Dominant periodogram peaks with periods more than 6 pentads (30 days) occurred 40% of the time on the average. Based on the pentad OLR time series plots deep convection and their precursors are composited. The time evolution of composite OLR maps reveal that patterns of low OLR values (indicating deep connection) shift north-eastwards coupled with low OLR values associated with mid-latitude troughs and linked to the ITCZ. Composite of kinematic and thermodynamic parameters associated with deep conJection and precursors are composited. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Oceanography en_ZA
dc.title Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study 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 Mpeta, E. J. (1997). <i>Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Oceanography. Retrieved from http://hdl.handle.net/11427/19650 en_ZA
dc.identifier.chicagocitation Mpeta, Emmanuel Jonathan. <i>"Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Oceanography, 1997. http://hdl.handle.net/11427/19650 en_ZA
dc.identifier.vancouvercitation Mpeta EJ. Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Oceanography, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19650 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mpeta, Emmanuel Jonathan AB - Intraseasonal convection oscillation over the northeastern and southwestern Tanzania during MAM and DJF seasons respectively are examined using December, 1979 to May, 1994 pentad (5-day mean) Outgoing Longwave Radiation (OLR) as an indicator of convective cloud distribution. Area-averaged OLR indices are derived for the two areas. Time series of OLR indices for MAM and DJF indicate large quasi-periodic OLR fluctuations in some years and small fluctuations in other years. Periodogram analyses results reveal that dominant periodogram values for the oscillations were different in different years over both areas. Dominant periodogram peaks with periods more than 6 pentads (30 days) occurred 40% of the time on the average. Based on the pentad OLR time series plots deep convection and their precursors are composited. The time evolution of composite OLR maps reveal that patterns of low OLR values (indicating deep connection) shift north-eastwards coupled with low OLR values associated with mid-latitude troughs and linked to the ITCZ. Composite of kinematic and thermodynamic parameters associated with deep conJection and precursors are composited. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study TI - Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study UR - http://hdl.handle.net/11427/19650 ER - en_ZA


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