Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"South Indian Ocean"”.
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Ocean model diagnosis of variability in the South Indian Ocean
… sea surface temperature (SST) variability in the South Indian Ocean may significantly influence weather and climate patterns in the southern African region. SST, in tum, can be influenced by variability in ocean fluxes, observations of which are limited in the South Indian Ocean and it is necessary to …
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Sea surface temperature anomalies in the South Indian ocean : observations and atmospheric modelling
Sea surface temperature (SSTs) variations in the South Indian Ocean have been found to influence rainfall over Southern Africa. As one of the modes of South Indian Ocean SST variability, the subtropical South Indian Ocean dipole is observed to be associated with dry and wet summer conditions over …
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The biophysical processes controlling the South-East Madagascar Bloom
… blooms are ecological hotspots in the ocean, and are fundamental to the biogeochemical cycling of elements, the storage of carbon and the ability to regulate the atmospheric carbon dioxide; and the life in the ocean. The South-East Madagascar Bloom, one of the largest blooms in the …
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An examination of the spatially extensive heavy precipitation events over South Africa and the associated moisture trajectories
… possibly the most important climatic variable in southern Africa. The absence of a good rainy season is often marked with low productivity and in some cases starvation. However, excessive rainfall can also bring with it disaster and destruction. Investigating the causes of such events has been the …
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The South Indian Convergence Zone and relationship with rainfall variability in Mozambique
Southern Hemisphere atmospheric circulation and sea surface temperatures in the South Indian Ocean, associated with the South Indian Convergence Zone (SICZ), the main rain producing system over southern Africa, and links with rainfall over Mozambique, are analysed. Cluster analysis applied to …
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Impact of spatio-temporal variability of the Mascarene High on weather and climate over Southern Africa
… over subtropical belts for both the Northern and Southern Hemispheres. This study investigates the spatio-temporal variability of the Mascarene High over the South Indian Ocean on (anomalous) weather and climate over southern Africa at intraseasonal, seasonal, interannual, multidecadal and event …
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Sensitivity of tropical cyclones in the Southwest Indian Ocean to the topography of Madagascar
… of tropical cyclone (TC) characteristics in the Southwest Indian Ocean (SWIO) to the presence of Madagascar topography. This is achieved through running two sensitivity experiments where the topography is i) flattened to a uniform plateau of 300 m height (FLAT run) or ii) ocean grid points …
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Upper ocean variability and tropical cyclones in the South West Indian Ocean
… (BLT). Similar to cyclones in other tropical ocean basins, tropical cyclones in the South West Indian Ocean also cause significant social and economic damage in southeastern Africa and Madagascar. To forecast TC intensity more accurately, monitoring upper ocean conditions in the South Indian …
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Where three oceans meet : the Algulhas retroflection region
The highly energetic Agulhas Retroflection region south of the African continent lies at the junction of the South Indian, South Atlantic, and Circumpolar Oceans. A new survey of the Agulhas Retroflection taken in March 1985, plus historical hydrographic data, allow its dynamical and water-mass …
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Nitrogen cycling in the South Atlantic and South Indian Oceans investigated using nitrate isotopes: implications for nutrient supply, ocean fertility, carbon export, and climate
… growth across much of the (sub)tropical ocean, thereby modulating ocean fertility and climate. Dinitrogen (N2) fixation is the dominant source of new N to the ocean and is thought to occur mainly in well-lit, warm, oligotrophic waters. The under-sampled South Atlantic and South Indian …
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An investigation into the impacts of the Benguela Niño on rainfall over southern Africa
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 …
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A numerical simulation of tropical storm Chedza over south-eastern Africa
… and agriculture over several regions in south-eastern Africa. The flooding was associated with tropical storm Chedza that developed in the Mozambique Channel on 11 January 2015. This study investigates the atmospheric circulation and potential mechanisms responsible for the heavy rainfall …
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A comparative study of Phoebetria albatrosses' interactions with mesoscale oceanographic features south of the African continent
… and palpebrata breeding at Marion Island in the South Indian Ocean were studied. Adult individuals were tracked between 2008 and 2011. The study examined the foraging distribution of the two species in relation to environmental parameters such as sea surface temperature. Interaction with …
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Neogene to quaternary foraminifera from the western margin of southern Africa
The western margin of southern Africa underwent major palaeoceanographic changes since the initiation of the Benguela Upwelling System during the Neogene. Microfossils in marine sediments provide key proxies in our understanding of how the margin evolved. Fossil shells (tests) of foraminifera …
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A fine-scale volumetric census of the water masses of the Agulhas retroflection area
… of the quantification of water masses around southern Africa are described in this thesis. The first, a pilot study, is concerned with the volumetric analysis of historic hydrographic data from the region off the South African west coast. It uses data that have been collected with various …
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Modelling wind-driven inter-ocean exchange in the greater Agulhas with the regional ocean modelling system
Two Regional Ocean Modelling System configurations, AGIO and ARC112, are developed to investigate (1) the structure of the Agulhas leakage, (2) the dynamical link between the leakage and the Agulhas Current, and (3) the sensitivity of this link to changes in the regional wind field. Both …
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Large-scale conditions that result in wet summers over arid Western Southern Africa
… rainfall patterns across the western region of southern Africa are poorly understood compared to the rest of southern Africa. Although the western interior of southern Africa is considered mostly arid, it is prone to highly variable rainfall and flash floods, impacting vulnerable communities and …
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An analysis of recent severe climate events over Tanzania
… The circulation patterns over the Atlantic and Indian oceans responsible for inter-annual and intra-seasonal rainfall variability in Tanzania were analysed and the skill of Global Circulation Model (GCM) in capturing the inter-annual variability assessed. The results were tailored to the …
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Long-lived mesoscale convective systems over Eastern South Africa
Previous studies on severe weather in South Africa have often focused on synoptic-scale systems such as cut off lows, tropical extratropical cloud bands, and tropical cyclones, with little attention placed on the smaller mesoscale convective systems (MCSs). On a global scale, MCSs are not only …
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