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 85 for “"Annual variability"”.
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Inter-annual variability of acoustic ray travel times in the northeast Pacific
… times are analyzed in order to investigate inter-annual basin-scale thermal variability. These thermal fluctuations may help detect any greenhouse warming and greater understanding of them will increase knowledge of ocean-atmosphere interactions which affect weather and climate. A discussion of …
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Seasonal and inter-annual variability of SST and chlorophyll-a off Angola
The aim of this dissertation is to use satellite-derived images for the study of spatial and temporal variations in SST and in concentration of surface chlorophyll-a of the main oceanographic features off Angola. SST time-series over the 1987 to 2002 were derived from Meteosat 5-day SST composites …
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The inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar
… of the bloom showed spatial and temporal variability. The wavelet analysis revealed a semi-annual signal for 2006 and 2008 and an annual one in 2004 due to the gradual decline in the concentration of chlorophyll-a. The transport of the bloom is affected by the passage of eddies where the …
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Seasonal and Annual Variability In Elemental and Isotopic Proxies of Past Ocean Conditions: Results From the Guaymas and Cariaco Basins
<p>The isotopic and trace element composition of planktonic foraminiferal shells are controlled by the chemical and physical proprieties of the ambient seawater and can be used to reconstruct past oceanic conditions. These proxies are quantitatively defined and validated by analyzing how the …
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Satellite derived sea surface temperature and wind field variability in the Benguela upwelling region
… the upwelling favorable wind conditions. Inter-annual variability is common, and with these datasets it was possible to highlight periods of anomalous conditions. Results indicated that both the seasonal and inter-annual variability between the northern and southern parts of the Benguela system …
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Precipitation variability and change over Morocco and the Mediterranean
… In addition to strong seasonality and high inter-annual variability, annual precipitation remains low (<500mm) across much of the region. Furthermore, the situation is not expected to improve under climate change as models project a sustained decline in precipitation in the Mediterranean, most …
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Variability of coastal upwelling south of Madagascar
… upwelling. The thesis seeks to characterise the variability of the coastal upwelling south of Madagascar. The first part of the thesis provides new insights on the structure, variability and drivers of the coastal upwelling south of Madagascar. Satellite remote sensing is used to characterize the …
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Evaluating CMIP6 Models in Simulating Southwest Indian Ocean Tropical Cyclone Activity (1979–2014): Comparison with ERA-5 Reanalysis
… was tested through the simulation of the inter-annual variability of tropical cyclones in the SWIO. The results show each CMIP6 model displaying a different signature on simulations. The ten analysed CMIP6 models are capable of reproducing the observed annual mean of genesis potential index …
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The South Indian Convergence Zone and relationship with rainfall variability in Mozambique
… form the SICZ. Intraseasonal and inter-annual variability of these systems and their contribution to the anomalies of rainfall over Mozambique were explored using composite, correlation and regression analyses for both the early (October to December) and the late (January to March) …
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Variability within the 10-year pollen rain of a seasonal neotropical forest
The effect of seasonal and multiannual environmental variability on the abundance and composition of Neotropical pollen rain was investigated using ten years of seasonal aerial pollen samples from Barro Colorado Island (BCI), Panama. Using canonical correspondence analysis, we identified the …
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Simulating South African Climate with a Super parameterized Community Atmosphere Model (SP-CAM)
… the reanalysis. The study further analyzed inter-annual variability of rainfall and temperature for different homogenous regions across the whole of South Africa using both configurations. It was found that SPCAM had a higher skill than CAM in simulating inter-annual variability of rainfall and …
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Seasonality of circulation in southern Africa using the Kohonen self-organising map
… be a robust technique for deducing the modes of variability of map patterns within a circulation data set, allowing variability to be expressed in terms of inter and intra-annual variability. The SOM is also found to be useful for comparing circulation data sets and finds particular application …
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A modelling perspective on precipitationin the Indus River Basin: from synopticto Holocene variability
… the archaeological context. Precipitation variability is investigated at various timescales due to their different impact on human societies and their importance in the climate system: the synoptic scale, the seasonal cycle, the inter-annual to multi-decadal variability, and the …
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Influence of climate, fire and phosphorus in the dynamics of vegetation in the Amazon-Cerrado border simulated with INLAND model
… isolated and combined effects of climate (inter annual variability and CO2), fire (F) and nutritional limitation by phosphorus (P) using the dynamic vegetation model INLAND in the transition between forest-Cerrado. The INLAND model is the first Brazilian model to simulate the vegetation dynamics …
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Migratory patterns of American shad (Alosa sapidissima) revealed by natural geochemical tags in otoliths
… natal tags from 12 rivers. Significant inter-annual variability in geochemical signatures from several rivers was detected, due largely to differences in 8180 values among years. The database was further expanded to include 20 rivers from Florida to Quebec, encompassing all major spawning …
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Vertical Structure of Propagating Features
The inter- and intra-annual variability of the western boundary North Atlantic 26.5 ?N region has been central in the observations of the strength and structure of the Atlantic Meridional Overturning Circulation (AMOC). Interest in this work began when some recent work estimated the inter-annual …
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Generating a climatology of surface solar radiation over the UK with application to wheat yield prediction
… climatology enabled an investigation of UK inter-annual variability and long term trends. The impact of synoptic scale weather typing on SIS accumulations was analysed using a combination of daily satellite based data from CMSAF and daily weather types from the GrossWetterLagen classification …
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Análise da pluviosidade na microrregião de sapé e sua correlação com a produção da cana-de-açúcar: percepção dos agricultores no município de Sobrado/PB.
The aim of this work consists in reviewing the annual and seasonal variations in rainfall in Microrregion Sapé/PB, and verify the degree of relationship of annual precipitation with sugarcane production in the temporal segment from 1996 to 2012. The survey was developed based on the theoretical and …
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Climatic and edaphic influences on the radial growth of eastern redcedar (Juniperus virginiana), Smoke Hole Canyon, West Virginia
The annual variability observed in tree-ring records has been used to reconstruct climate conditions at the local, regional, and global scales. Dendrochronology, the study of tree rings, has typically focused on locations where trees are limited by a single climatic variable (i.e. temperature or …
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How does plankton distribution and activity influence the variability of carbon dioxide uptake in the North Atlantic?
… volunteer observing ships to analyse the variability of the carbon dioxide (CO2) sink in the North Atlantic at a range of spatial and temporal scales. Phytoplankton indices collected from the continuous plankton recorder (CPR) and the concentration of CO2 within the surface waters show …
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