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 34 for “"Indian Ocean Dipole"”.
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Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall
… to El Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole/Zonal Mode (IODZM) for the period 1950 to 1999. An empirical orthogonal function (EOF) analysis of OND rainfall field revealed that the north-south aligned areas of the eastern SADC are located in different covariability regions. …
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An investigation into the relative contributions of ENSO, Benguela Niño and the sub-tropical Indian Ocean dipole on summer rainfall over southern Africa
… related to ENSO, Benguela Niño and subtropical Indian Ocean Dipole (SIOD) has on summer rainfall over southern Africa. To achieve this, a partial correlation method was employed to analyse the possible relationship between rainfall variability and interannual SST variability in the Niño3.4 …
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Sea surface temperature anomalies in the South Indian ocean : observations and atmospheric modelling
… 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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On the external forcing of Indian Ocean climate variability across timescales
… thesis explores how external forcings affect Indian Ocean climate in the past, present, and future using paleoclimate archives in conjunction with observational and climate model data. Chapter 2 presents a novel geochemical stalagmite record from northern Madagascar which spans the end of the …
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On the external forcing of Indian Ocean climate variability across timescales
… thesis explores how external forcings affect Indian Ocean climate in the past, present, and future using paleoclimate archives in conjunction with observational and climate model data. Chapter 2 presents a novel geochemical stalagmite record from northern Madagascar which spans the end of the …
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Understanding the Effect of Internal Climate Variability on 20th Century Indian Ocean Sea Level: Results from Newly Reconstructed Sea Level Data
… coastal zones of countries that border the Indian Ocean are at risk due to sea level rise. However, sea level change in the Indian Ocean is poorly understood primarily due to short and sparse tide gauge observations. Although satellite altimetry provides accurate basin-wide sea level …
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Aspects of sea level variability in the southwest Indian Ocean and the east coast of Africa - (latitude 0-35°S and from the coast to 60°E)
… of varying durations in the southwest Indian Ocean and the East coast of Africa (Lamu, Mombasa, Zanzibar, Durban, Port La Rue and Port Louis) show variability which are related to global, regional time scales, local weather and climatic changes, oceanographic and hydrological forcing …
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Simulating the characteristics of tropical cyclones over the South West Indian Ocean using an adaptive Stretched-Grid Global Climate Model
… Tropical Cyclones (TCs) over the South West Indian Ocean (SWIO) have used Global Circulation Models (GCMs) with uniform grid. This study examines the capability of a GCM with adaptive grid stretching (CAM-EULAG, hereafter CEU) in simulating the characteristics of TCs over the SWIO. In the …
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Sexual segregation and abundance trend of whale sharks in southern Mozambique
… time from high tide, moon illumination, Indian Ocean dipole index, wind, and chlorophyll a concentration) predictors were modelled in relation to the total, male, and female sightings. Encounter histories of individual sharks were then used in three capture-markrecapture model …
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Drought in Southern Africa: structure, characteristics and impacts
… ward whilst cloud bands shift to the warm ocean east of Madagascar. The jet stream is strengthened and displaced equator ward as the Angola Low weakens at the surface. The low-level moisture flux from the Indian Ocean is reduced and westerly wind anomalies become dominant. The vertical …
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Variability of coastal upwelling south of Madagascar
… index is calculated. The influence of winds and ocean currents as drivers of the upwelling are investigated using satellite, in-situ observations, and a numerical model. Results reveal the presence of two well-defined upwelling cells. The first cell (Core 1) is located in the southeastern corner …
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The Study of the Indian Ocean Response to Climatic Events Using Satellite Observations and Model Simulations
… and interannual climate variability with surface ocean properties is an active area of research in the Indian Ocean region. Understanding how climate variations impact basin-wide salinity patterns is an important step in understanding how this variable impacts ocean circulation and feedbacks.</p> …
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Simulation of variability in the tropical Western Indian Ocean
The oceanic circulation and properties in the Tanzanian shelf region in the tropical western Indian Ocean have been studied in this thesis using a regional ocean model. The study investigated the influences of the Northeast Madagascar Current (NEMC) in the Tanzanian shelf waters at the annual …
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Influence of the Indian Ocean Subtropical Dipole on the Agulhas current
… studies have successfully linked Subtropical Dipole (SIOD) events to southern Africa’s austral summer precipitation patterns, however, none have investigated the SIOD’s influence on the Greater Agulhas Current System. Here, the SIOD climatology was developed using a Regional Ocean Modeling …
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Modelling the mesoscale variability in the greater Agulhas Current system using hybrid coordinate Ocean model
The ocean circulation dynamics in the greater Agulhas Current system are dominated by mesoscale variability, which is highly non-linear, and therefore difficult to measure and simulate accurately. Moreover, the shedding of Agulhas rings from the retroflection south of Africa, which is the dominant …
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Investigating the movement and foraging ecology of reef manta rays (Mobula alfredi) in the Chagos Archipelago
… The species is dispersed throughout the Indian and West Pacific Oceans in small, isolated populations that tend to have a limited home range. Individuals within a population regularly visit specific locations to routinely engage in activities such as feeding, where they often exhibit …
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Study On the Basin Scale Salt Exchange In the Indian Ocean Using Satellite Observations and Model Simulations
<p>The importance of Indian Ocean circulation dynamics to the regional and global weather signatures is increasingly recognized at large partly due to improved ocean observations in the last few decades. Observational and modeling efforts are directed towards understanding the impact of …
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Effects of oceanic and atmospheric phenomena on precipitation and flooding in the Manafwa River Basin
… to determine the relationship between certain oceanic and atmospheric phenomena and the precipitation patterns in the Manafwa River Basin of eastern Uganda. Such phenomena are the El Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). The indices that describe ENSO and IOD are …
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Links between the Seychelles-Chagos thermocline ridge and large scale climate modes and primary productivity; and the annual cycle of chlorophyll-a
… 90°E and 5°S-12°S in the southwest tropical Indian Ocean. It is a region of strong ocean-atmosphere interactions due to the high variability of the thermocline depth caused by the local Ekman pumping. Sea-viewing Wide Field-of-view Sensor (SeaWiFS) has shown high variability of surface …
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An altimetry based examination of the path and variability of the Agulhas Return Current
… strengthening wind stress over the worlds oceans is yielding a western boundary intensification and pole-ward shift of oceanic currents (Yang, 2016). Shifting wind regimes and perturbations in neighboring currents have been associated with variations in the flow path of western boundary …
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