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 81 for “"Natural Variability"”.
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Natural variability in eastern tropical Pacific nitrous oxide emissions
… gas and ozone depleting substance, but its natural sources remain poorly constrained. Marine emissions are likely much higher than IPCC estimates predict, due to unusually high emissions from the oxygen minimum zones (OMZs) in the eastern tropical Pacific and Arabian Sea that are not …
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Analyzing the effects of unforced natural variability and anthropogenic forcing on ENSO variability using CESM
… contributor to Earth’s inter-annual climate variability, with worldwide weather effects (Whetton and Rutherfurd, 1994; Hoerling and Zhong, 1997; Dai and Wigley, 2000). Understanding how ENSO may change with climate is a major challenge, given the internal variability of the system and …
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Natural Variability in Phenolic and Sesquiterpene Constituents Among Burdock (<i>Arctium lappa</i> L. and <i>Arctium minus</i> L.) Leaves for Potential Medicinal Interests
… to result in substantial levels of phenotypic variability among and within species, as well as among and within accessions within species with respect to many traits, including levels of potentially health-beneficial compounds found in medicinal or edible plant parts. Moreover, because burdock …
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Floodplain Risk Analysis Using Flood Probability and Annual Exceedance Probability Maps
… two approaches to determining the effects of natural variability and model uncertainty on the extents of computed floodplain boundaries. The first approach represents the floodplain boundary as a spatial map of flood probabilities -- with values between 0 and 100%. Instead of representing the …
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Quasi-periodic oscillations in observed and simulated temperatures, and implications for the future
Earth's climate system displays various modes of variability ranging from intra-seasonal to inter-decadal time scales, which hamper our ability to detect the human-caused warming signal in the climate record. Despite 44 years of climate modeling and much improvement being made, the spatial and …
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
… our mechanistic understanding of the impact of natural variability on carbon and sulfur cycling. Variability in ocean physics, specifically changes in vertical mixing, is shown to significantly impact both cycles. The impact of interannual variability on the detection and attribution of …
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
… our mechanistic understanding of the impact of natural variability on carbon and sulfur cycling. Variability in ocean physics, specifically changes in vertical mixing, is shown to significantly impact both cycles. The impact of interannual variability on the detection and attribution of …
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A Dendroclimatic Investigation of Southwestern Saskatchewan
… are used to extend the historical record of natural variability. Understanding the frequency, magnitude, and duration of past climate extremes allows researchers to better forecast the probability of future extreme hydrological events. Through standard dendrochronological methods, fifteen …
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The impact of ocean climate variability on prey availability and the reproductive performance of a planktivorous seabird, ancient murrelet (Synthliboramphus antiquus)
… as evidenced by exacerbating change to the natural variability in physical and chemical oceanographic conditions. As upper trophic level predators, colonial seabirds are useful indicators to assess long-term trends and changes in oceanographic conditions on various spatial and temporal …
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Integrating GIS with Benthic Metrics: Calibrating a Biotic Index to Effectively Discriminate Stream Impacts in Urban Areas of the Blackland Prairie Eco-Region
… differences in community structure due to natural variability from those caused by changes in water quality due to watershed impacts. Using geographic information systems, a total of nine watersheds, each representing a different mix of land uses, were chosen for evaluation. A total of 30 …
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An 828 Year Streamflow Reconstruction for the Jordan River Drainage Basin of Northern Utah
… records only account for a small amount of the natural variability in streamflow and climate. By utilizing dendrochronology this study seeks to better understand variability of streamflow in the Jordan River Drainage Basin over the last 828 years. A GIS model was used to identify potential …
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Transport of Kinetically Adsorbing Contaminants in Randomly Heterogeneous Aquifers
… in heterogeneous aquifers describes the natural variability in hydraulic conductivity by means of a stationary random field. Therefore, the solute concentration distribution at a given time also becomes a random field. For the case of an inert solute, Dagan found a solution for the …
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The effect of hot-pressing parameters on resin penetration and flakeboard layer properties
… of penetration was found to be a function of the natural variability of the wood and was not influenced by the pressing parameters of temperature, moisture content, pressure, or time. These four parameters were found to influence the area of penetration by controlling the viscosity and flow of the …
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The potential of sodium sulfur battery energy storage to enable further integration of wind
… on-peak availability of wind, and mitigating the natural variability and the forecast errors in wind. Further, energy storage can check the curtailment of wind under low load conditions. Under the liber- alized markets, the effects of additional wind on the system manifest themselves in the energy …
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Examining sources of ecological resilience to climate change for restoration planning
… catalyst to shift approaches that allow for natural variability and shifting dynamics to accommodate for unknown climate change impacts. Restoring natural sources of resilience is believed to be an effective way to build adaptive capacity to climate change. There are however many questions …
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Detecting anthropogenic impacts on estuarine benthic communities
… the impacts of anthropogenic stressors from natural variability in the marine environment is extremely difficult. This is particularly true for estuaries, due to their inherent complexity and the prevalence of difficult-to-manage diffuse stressors. Successful management and protection of …
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The interaction of acidification and warming on the South African abalone, Haliotis midae, and the potential for mitigation in aquaculture
… this commercially valuable species have depleted natural populations. Commercial abalone aquaculture began as a means to meet the market demand for H. midae and currently accounts for 77 % of South Africa's aquaculture revenue. Despite marked growth in this industry over the past decade, further …
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Marine Aggregate Dredging: A New Regional Approach to Environmental Monitoring
… Recovery, Restoration, Habitat Mapping and Natural Variability. The essay then describes the current approach to monitoring, together with its limitations. This is followed by a description of the new monitoring approach, with an explanation of why it is considered more suitable for meeting …
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Evaluation of the Reference Unit Method for Herbaceous Biomass Estimation in Native Grasslands of Southwestern South Dakota
… which is necessary to account for the natural variability of vegetation at a landscape scale. A biomass estimation technique was previously developed using representative samples or "reference units", which eliminated the need to harvest biomass from all sample plots. Use of reference …
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