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 320 for “"Temporal variability"”.
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Spatial and temporal variability in Acacia population dynamics
Variability in fire, herbivory, and climate facilitate the coexistence of trees and grasses in savannas and impact upon savanna structure, which also varies substantially both spatially and temporally. These features can shape savannas at an ecosystem and even at a global scale, but mechanisms for …
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Spatial and temporal variability in Acacia population dynamics
Variability in fire, herbivory, and climate facilitate the coexistence of trees and grasses in savannas and impact upon savanna structure, which also varies substantially both spatially and temporally. These features can shape savannas at an ecosystem and even at a global scale, but mechanisms for …
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Mechanisms Promoting Spatial and Temporal Variability in Plant Defense
… garden experiment to empirically measure genetic variability of resistance and tolerance and quantify their associated fitness costs and selection gradients. Lastly, I conducted a field experiment to test the prediction that successional changes in the environment alter the adaptive value of …
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Spatial and Temporal Variability of Subsidence: Fort Bend County, Texas
This study presents new geodetic data revealing the evolution and magnitude of land subsidence in Fort Bend County (FBC) through 2014. Subsidence in the greater Houston metropolitan area has been monitored since 1926 and several generations of maps have portrayed more than three meters of …
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Spatio-temporal Variability in Surface Ocean pCO2 Inferred from Observations
The variability of surface ocean pCO2 is examined on multiple spatial and temporal scales. Temporal autocorrelation analysis is used to examine pCO2 variability over multiple years. Spatial autocorrelation analysis describes pCO2 variability over multiple spatial scales. Spatial autocorrelation …
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Temporal variability of arsenic transport into the Upper Mystic Lake
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Snowstorms in Upstate New York: synoptics, spatial modeling and temporal variability
… significantly decreased in the mid-1990s. The variability in trends may be linked to environmental conditions, as air temperatures were incorporated in 21/35 of the significant models. The Great Lakes also influenced seasonal snowfall totals mostly in Regions 1 and 3, while precipitation and …
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Long Term Ground Based Precipitation Data Analysis: Spatial and Temporal Variability
… of this research for evaluation of spatial and temporal ENSO events from modeled and gauge data using: 1) Wavelets 2) Autoregressive-moving-average (ARMA) model / Empirical Mode Decomposition (EMD) 3) Vector Generalized Linear Model (VGLM). This dissertation aims to propose and evaluate a …
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Elucidating Temporal Variability in Organic Matter Sources and Cycling in Tropical Rivers
… carbon derived from the Lower Basin. Seasonal variability in the composition of particulate lignin corroborates these findings. Finally, the highest concentrations of branched tetraether lipids were found in floodplains and lake beds, suggesting that anaerobic environments may be a significant …
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Characterization of the spatial and temporal variability in pan-Arctic, terrestrial hydrology
… and methods for predicting the spatial and temporal variability in pan-Arctic hydrology.</p><p>This dissertation discusses pan-Arctic water budgets drawn from a hydrological model which is appropriate for applications across the terrestrial Arctic. Including effects from soil-water phase …
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Spatial and temporal variability of carbon stocks within the River Colne Estuary
… therefore to better understand the spatial and temporal variation of saltmarsh sediment total organic carbon (TOC) content. Therefore, three saltmarshes along the salinity gradient of the Colne Estuary were studied. The effect of the study sites’ locations along the estuary, higher plant species …
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Disturbance and temporal variability in invertebrate assemblages in two South African rivers
… as disturbances, the disturbance regime and the temporal dynamics of invertebrate assemblages, over the short term and at intra- and inter-annual time scales in the Molenaars and Berg Rivers in the Western Cape of South Africa. Invertebrate responses to individual floods were investigated by a …
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Spatial and temporal variability of coastal temperature and salinity in Angolan waters
… and interannual temperature and salinity variability. The main aims of this study were thus to identify, quantify and analyze the above parameters and to establish their effects on the appropriate time scales of variability.
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Magnitude and spatio-temporal variability of methane emissions from a eutrophic freshwater lake
… through bubbling. However, spatial and temporal heterogeneity in ebullition has complicated efforts to accurately measure such methane emissions. This thesis presents the results from a two-year study of methane biogeochemistry conducted at the eutrophic, stratified, Upper Mystic Lake …
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Spatial and temporal variability of tide-induced salt flux in a partially mixed estuary
… fortnightly tidal forcing, and along channel variability are explored. Four river discharge conditions were considered: 1200 m3 s-1, 600 m3 s-1, 300 m3 s-1, 150 m3 s-1. Tide-induced residual salt flux was found to be variable along the channel, with locations of counter-gradient flux during …
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Spatio-temporal variability of aerosols in the tropics relationship with atmospheric and oceanic environments
… of recent advances in the study of aerosols variability, uncertainty in their spatial and temporal distributions still presents a challenge in the understanding of climate variability. For example, aerosol loading varies not only from year to year but also on higher frequency intraseasonal …
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Spatial and temporal variability of the soil saturated hydraulic conductivity in gradients of disturbance
… and to describe the resulting spatial-temporal patterns. The main hypotheses were: 1) disturbances cause an apparent displacement of the less permeable soil layer towards the surface, either due to a loss of the permeable surface soil after land-sliding, or as a consequence of the …
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