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.
Results
Showing 1 to 20 of 45 for “"Spatiotemporal variability"”.
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Spatiotemporal variability of methane ebullition from lake sediments
… emissions is delivered by bubbles, and the spatiotemporal heterogeneity of ebullition makes measurement challenging and impacts bubble dissolution and atmospheric emissions. In this thesis, we present an analysis of both the episodicity and spatial structure of methane venting from soft …
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Coral reef soundscapes : spatiotemporal variability and links to species assemblages
… in space and time. However, the drivers of this variability are poorly understood. Tracking these changes and studying how coral reefs respond to natural and anthropogenic disturbance can be challenging and costly, particularly for reefs that are located in remote areas. Because many reef animals …
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Coral reef soundscapes: spatiotemporal variability and links to species assemblages
… in space and time. However, the drivers of this variability are poorly understood. Tracking these changes and studying how coral reefs respond to natural and anthropogenic disturbance can be challenging and costly, particularly for reefs that are located in remote areas. Because many reef animals …
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Intraurban Spatiotemporal Variability of Ambient Air Pollutants across Metropolitan St. Louis
… provided an opportunity to examine intraurban spatiotemporal variability for these air quality parameters.</p><p>This dissertation focused on exploring and assessing aspects of ambient air pollutant spatiotemporal variability in the St. Louis area from three progressively expanded spatial …
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Spatiotemporal Variability of CO2, Solar-Induced Fluorescence, And Precipitation Over the Tropical Rainforests
… models to explore photosynthetic activity, spatiotemporal variability, and correlation among critical variables (e.g., Solar-induced chlorophyll fluorescence (SIF), CO2, precipitation, high vapor pressure deficit (VPD), and burned areas). Specifically, we use Orbiting Carbon Observatory 2 …
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Spatiotemporal variability of hydrologic response : an entropy-based approach using a distributed hydrologic model
… with soil moisture being double-bounded so its variability peaks at intermediate conditions. Finally, although not explicitly coded in MOBIDIC, hysteresis is evident in the discharge-storage plots. It emerges from the use of a dual-pore soil structure that captures the threshold behavior of …
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Spatiotemporal Variability in the Macroinvertebrate Community of a Small Coastal California Stream, Little Creek, Davenport, California
<p>Macroinvertebrate community structure was characterized along the channel gradient of a headwater stream in a coast redwood forest on Cal Poly’s Swanton Pacific Ranch in Davenport, California. The significance of physical habitat characteristics in describing macroinvertebrate assemblage …
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Spatiotemporal variability in Antarctic krill (Euphausia superba) around South Georgia from Antarctic fur seal (Arctocephalus gazella) diets at two long term monitoring sites
Despite its biological, biogeochemical, and economic importance, there is much about Antarctic krill (Euphausia superba Dana, 1852) that is still poorly understood. This is especially true for its recruitment into South Georgia’s waters, which is highly variable and difficult to predict. Krill …
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Interaction between water vapor, radiation and convection in the tropics
The spatiotemporal variability of water vapor near the Equator remains poorly understood because convective organization simultaneously spans the cloud scale (~ 10km) and the planetary scale (~ 10, 000km). Spatiotemporal variability of tropical water vapor may result from internal instabilities of …
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High resolution sedimentary archives of past millennium hurricane activity in the Bahama Archipelago
… and proxy-model integration to constrain the spatiotemporal variability in hurricane activity in the Bahama Archipelago over the past millennium. I present annually-resolved archives of storm activity stretching over the past 1000 to 1500 years in sediment cores from blue holes on three …
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Ground- and satellite-based observations of column nitrogen dioxide: instrument performance, column-to-surface relationships, and the role of meteorology in coastal urban environments
… may address gaps in our understanding of its spatiotemporal variability. Space-based observations of NO2, however, have coarse-resolution sensors, requiring well-constrained inputs, and until recently have only collected one observation per day (at most), limiting their utility for …
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The Effects of Divided Attention on Speech Motor, Verbal Fluency and Manual Motor Task Performance
… decreased, while sound pressure level and spatiotemporal variability increased. The impact of manual motor performance on speech differed between the right and left hand. Manual motor scores significantly decreased when concurrently performed with the verbal fluency task. Also, verbal …
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Determining the influence of transpiration on soil moisture pathways using electrical resistivity imaging
… moisture depletion. ERI successfully captured spatiotemporal variability of soil moisture on daily and seasonal timescales, and with further research could be used to monitor temporal changes in tree water content.
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High resolution sedimentary archives of past millennium hurricane activity in the Bahama Archipelago
… and proxy-model integration to constrain the spatiotemporal variability in hurricane activity in the Bahama Archipelago over the past millennium. I present annually-resolved archives of storm activity derived from sediment cores from blue holes on three islands in the Bahama Archipelago: South …
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Improved estimates of risk of exposure to pathogens transmitted by mosquitoes
… of the effect of exposure to mosquitoes on the variability of risk has not always been clear. The risk of exposure to mosquito-borne pathogens is complicated by the transmission cycle of the pathogen, the dynamic nature of conditions that affect mosquito abundance and species- and …
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An Experimentally-validated Agent-based Model to Study the Emergent Behavior of Bacterial Communities
… do not permit population heterogeneities or spatiotemporal variability in the environment. To bridge this gap, we have created and experimentally validated a scalable, computationally-efficient, agent-based model of bacterial chemotaxis and quorum sensing (QS) which robustly simulates the …
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Articulatory motor performance as a function of phonetic complexity in Parkinson's disease
… range of motion, movement duration, and spatiotemporal variability. Results: Significantly smaller movements and slower movement speeds were evident in talkers with PD, predominantly for words with high phonetic complexity. Additionally, the effect sizes of between-group differences were …
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Relationship Between West African monsoon precipitation characteristics and maize yields across Sub-Saharan West Africa
… precipitation estimates to characterize the spatiotemporal variability of the monsoon. Multi-year annual precipitation characteristics of the monsoon such as total precipitation, number of non-precipitating days, and timing were derived and aggregated across the maize growing regions of West …
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Soil-atmosphere fluxes of CO2 and CH4 in annual and perennial cropping systems in southern Sweden
… also taken. CO2 fluxes exhibited large temporal variability, but low spatial variability, while CH4 fluxes exhibited large spatiotemporal variability. CO2 fluxes were found to have a positive exponential relationship with soil temperature, whereas CH4 fluxes were found to have a negative linear …
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