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 82 for “"methane emissions"”.
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Investigation of Methane Emissions and Sources
Methane (CH4) is an important trace gas and the most potent greenhouse gas in the global atmosphere. This study addressed CH4 related issues using a multi-pronged approach to monitor, characterize, and quantify CH4 emissions and sources through three observational platforms including Remote Methane …
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Measuring Methane Emissions in the Urban Environment
Mitigating methane (CH4 ) emissions is a necessary intervention to address the immediate impacts of anthropogenic climate change. Bottom-up inventories and models are used to predict the quantity of CH4 emissions, but these estimates are poorly constrained, especially on a source-by-source basis. …
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Quantifying Methane Emissions from the Greater Toronto Area
… has committed to reduce its greenhouse gas (GHG) emissions by 30% of2005 levels by 2030. The Greater Toronto Area (GTA, pop. 6.4 million) is the most populous city in Canada, thus accurately quantifying GHG emissions from the GTA is an important step towards meeting Ontario’s commitments. In order …
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Characterizing methane emissions on oil and gas sites
Reducing methane emissions from the oil and gas sector is a key component of short-term climate action, and emission reduction efforts in this sector are increasingly driven by measurements at the individual facility scale. This thesis introduces a number of inversion techniques that use methane …
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Assessing Bovine Methane Emissions: Respiratory Simulation and Optical Gas Imaging Methods
Bovine methane emissions contribute significantly to global greenhouse gas levels. Quantifying these emissions is of key importance in mitigating their production. This work investigates the physical simulation of cattle breaths and the assessment of their methane content through the use of optical …
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Alternative Feeding Resources in the Mediterranean areas to mitigate methane emissions from sheep
… of reducing the carbon footprint, alleviating methane gas emission and reducing dependence on cereal feeding in fattening lambs. Two experimental trials were set up in parallel in an experimental farm in Villarosa (EN) both with Comisana lambs at 90 days of age. Two level of inclusion i.e. 24% …
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Quantifying Methane Emissions from Sewer Covers in an Urban Sanitary Wastewater Collection Network
Sewer covers present an interface for biogenic methane (CH4) gas produced in the wastewater collection and transportation system to escape to atmosphere as an emission. However, the contribution of these emissions to municipal CH4 footprints is not well understood. In the research conducted for …
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Methane Emissions from Direct-Seeded, Delayed-Flood Rice Grown on a Clay Soil
<p>Due to the production of methane (CH4) under flooded-soil conditions, rice (Oryza sativa L.) cultivation is a major contributor to agricultural CH4 emissions. Studies examining CH4 emissions from rice have only recently been initiated in Arkansas and no data have been collected from rice …
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Magnitude and spatio-temporal variability of methane emissions from a eutrophic freshwater lake
Methane is the second most important greenhouse gas after carbon dioxide, and it can significantly impact global climate change. Considerable amounts of methane can be released to the atmosphere from freshwater lakes, particularly through bubbling. However, spatial and temporal heterogeneity in …
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Carbon dioxide and methane emissions from the Te Arawa lakes of Rotorua, New Zealand
… to the rapidly increasing greenhouse gas (GHG) emissions, namely CO₂, CH₄ and N₂O. The Intergovernmental Panel for Climate Change (IPCC) has prepared an emission reduction strategy. So far, inland waters, including lakes and reservoirs, have not been included in the global carbon cycle. However, …
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An investigation of the combined stable isotopic composition of methane emissions from northern wetlands
Methane is a radiatively active, naturally occurring atmospheric trace gas which is thought to account for as much as 19% of the enhanced greenhouse effect. Ice core studies have shown that the atmospheric concentration has more than doubled since pre-industrial times. Wetlands are the largest …
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Ice age wetland biogeochemistry: The influence of carbon dioxide starvation on wetland methane emissions
… show that the atmospheric concentration of methane (CH<sub>4</sub>) during the Last Glacial Maximum (LGM) was 40-50% lower than during the preindustrial Holocene. To understand this natural variation it is important to know how the sources and sinks of CH<sub>4</sub> change over time. …
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Evaluation of Ground-Based Spectral Imaging Capabilities for Detecting and Quantifying Landfill Methane Emissions
Methane (CH₄) is the second most important anthropogenic greenhouse gas, contributing significantly to climate change. Landfills are major anthropogenic sources of methane, but these emissions are subject to significant uncertainty. Due to their substantial mitigation potential, accurate and …
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Nitrous oxide and methane emissions from denitrifying bioreactors with and without a soil cover
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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Investigating the atmospheric composition and climate response to mitigation: a methane emissions-driven approach
Methane is the second most important greenhouse gas after carbon dioxide, and also plays a central role in the chemistry of the atmosphere. The combination of its shorter lifetime and higher effectiveness as a greenhouse gas makes it an attractive option for near-term mitigation of climate change. …
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Under Pressure: Decomposing and Predicting Methane Emissions Variability in U.S. Oil and Gas Basins
Methane is a molecule with unique properties that provide a powerful opportunity to take near-term action on climate change and strengthen today’s economy. This is due to methane’s warming power of 28x carbon dioxide, short atmospheric lifespan of 12 years, and methane being the primary component …
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Using Systems Architecture and the EVDT Framework for Monitoring Methane Emissions in Rio de Janeiro
Methane is a powerful greenhouse gas that has important implications for climate change. Over the past decade, satellites have rapidly improved their ability to detect this gas from above the atmosphere. This Thesis uses two Systems Engineering frameworks, Systems Architecture and EVDT, to examine …
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PLANT SECONDARY METABOLITES AS A STRATEGY TO REDUCE METHANE EMISSIONS AND IMPROVE FEED EFFICIENCY IN RUMINANTS
… for about 14.5% of anthropogenic greenhouse gas emissions. Enteric fermentation represents the second largest source of these emissions, being responsible for approximately 40% of total livestock emissions, mainly in the form of methane (CH4). It is crucial to reduce enteric CH4 emissions from …
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Enteric methane emissions mitigation in U.S. beef production: industry adoption, public perception, and potential market impacts
… Cattle are ruminant livestock that emit enteric methane (CH₄) as part of their natural digestive process. The U.S. beef cattle industry is receiving pressure to reduce greenhouse gases emissions, including methane. The U.S. Roundtable for Sustainable Beef has set a target for the U.S. feedlot …
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