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 26 for “"nitrous oxide emissions"”.
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Natural variability in eastern tropical Pacific nitrous oxide emissions
Nitrous oxide (N2O) is a powerful greenhouse 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 …
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Paddock scale nitrous oxide emissions from intensively grazed pasture: Quantification and mitigation
… soils are the main contributor to global emissions of the potent greenhouse gas nitrous oxide (N₂O) to the atmosphere. Nitrous oxide can absorb and transform radiative energy emitted from the sun to earth into heat. The ability of N₂O to absorb energy is part of the greenhouse effect and …
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Nitrous oxide emissions under different corn field managements in the United States
Nitrous oxide (N2O) is a potent greenhouse gas that also contributes to stratospheric ozone depletion. Intensive nitrogen fertilizer use has increased agricultural N2O emissions and motivated research efforts to identify field management techniques that best mitigate N2O emissions and reduce these …
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Legacy Effects of Long-term Manure Applications on Soil-derived Nitrous Oxide Emissions
… regime to annual urea applications would affect nitrous oxide (N2O) emissions. My hypotheses were that long-term manure applications would produce a legacy (or priming) effect that would result in enhanced N2O emissions following the changeover to a more readily available nitrogen source and that …
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The influence of redox dynamics on nitrogen cycling and nitrous oxide emissions from soils
Soils are a dominant source of nitrous oxide (N2O), a potent greenhouse gas. The complexity of drivers of N2O production and emissions has hindered our ability to predict the magnitude and spatial dynamics of N2O fluxes. Soil moisture can be considered a key driver because it influences oxygen …
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Estimating regional nitrous oxide emissions using isotopic ratio observations and a Bayesian inverse framework
Atmospheric nitrous oxide (N₂O) significantly impacts Earth's climate due to its dual role as an inert potent greenhouse gas in the troposphere and as a reactive source of ozone-destroying nitrogen oxides in the stratosphere. Global atmospheric concentrations of N₂O, produced by natural and …
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Spring-Thaw Nitrous Oxide Emissions From Reed Canarygrass On Wet Marginal Soil In New York State
… climates, a significant fraction of annual emissions of nitrous oxide (N2O) from agricultural land occurs during soil thaw. The objective of this study is to determine the impact of conversion of long-term fallow grassland to perennial grass bioenergy crops on N2O emissions during …
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Direct and indirect nitrous oxide emissions from controlled release and conventional fertilizers applied to potatoes in coarse textures soil.
… quality concern, and may potentially also reduce emissions of N2O, a greenhouse gas with nearly 300 times the warming potential of carbon dioxide. However, comparisons of multiple PCUs are uncommon. Studies were conducted over three years to compare N loss (as NO3 - and N2O), yield response, and N …
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The effect of winter grazing and a nitrification inhibitor on nitrous oxide emissions and denitrification in a stony soil
… the production of the powerful greenhouse gas, nitrous oxide (N₂O). However, at the beginning of this research project, no information was available on denitrification and N₂O emission from forage crops grown in free-draining stony soils, which are widespread in Canterbury. The objectives of …
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The carbon footprint analysis of wastewater treatment plants and nitrous oxide emissions from full-scale biological nitrogen removal processes in Spain
… approach. Literature on greenhouse gas (GHG) emissions and LCA are reviewed and the methodology employed in the analysis is discussed. Two selected WWTPs in Madrid, Spain, i.e. La Gavia and Boadilla, are analyzed and the carbon footprints are calculated, using GaBi software by …
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Climate change and global crop yield: impacts, uncertainties and adaptation
… of crop response to elevated carbon dioxide. Third, to link climate impacts with adaptation, I introduced the recently developed concept of representative agricultural pathways and examined their potential use in models to explore farming adaptation options within biophysical and …
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Mitigation strategies for nitrous oxide emissions based on fertilization management of irrigated crops in a mediterranean climate = Estrategias de mitigación de óxidos de nitrógeno basadas en el manejo de la fertilización en cultivos de regadío bajo clima mediterráneo
… to reduce atmospheric pollutants such as nitrous oxides from agricultural soils. However, little is known about it in soils from Mediterranean and tropical countries. This study investigates the influence of different factors on nitrous and nitric oxide (N2O and NO) emissions and therefore …
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Characterization of reactive and non reactive trace gas fluxes in and above soil
… human activities have dramatically increased emissions and removal of nitrogen to the global atmosphere by as much as three to five fold. Nitrous oxide is the fourth largest single contributor to positive radiative forcing, and serves as the only long-lived atmospheric tracer of human …
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Systems approaches to infer microbial community interactions and their impacts on ecosystem function
… and the role of nitrate-reducing communities in nitrous oxide emissions. I also highlight how microbial community-scale metabolic models (MCMMs) can be leveraged to predict Clostridioides difficile (C. difficile) colonization in the human gut microbiome, provide mechanistic insights into the …
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The regulation of denitrification in P. denitrificans
… the complete removal of nitrite, nitric oxide and nitrous oxide from the cytoplasm. Comparison of anaerobic and aerobic gene expression data in continuous cultures of Paracoccus denitrificans revealed a majority of highly expressed genes were co-regulated by CPR/FNR type transcriptional …
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Application of Multi-Port Mixing for Passive Suppression of Thermo-Acoustic Instabilities in Premixed Combustors
… gas turbines as a means of meeting strict emissions standards without compromising efficiency. Mixing the fuel and air prior to combustion allows for lower temperature flame zones, creating the potential for drastically reduced nitrous oxide emissions. While effective, these systems are …
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Dialing in the most corn-profitable and environmentally responsible nitrogen rate
… leaching, ammonia (NH3-N) volatilization, and nitrous oxide (N2O-N) emissions. The mean economic optimum N rate (EONR) was 173 kg N ha-1, with a coefficient of variation (CV) of 23%, corresponding to an optimum range of 133 to 213 kg N ha-1. Above this threshold, yield gains plateaued or …
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Direct and Indirect Greenhouse Gas Emissions from Biomass Storage: Implications for Life Cycle Assessment of Biofuels
… in the United States and reduce greenhouse gas emissions. Gaps in current approaches to estimating the net greenhouse gas emissions from second-generation biofuels may lead to underestimation of the carbon intensity of these fuels. Current life cycle assessment models of biofuels do not …
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A Process-Based Nutrient Model for the Bedded Manure Pack of Confined Beef Systems
… to determine differences in ammonia, carbon dioxide, nitrous oxide, and methane concentrations and moisture content, nutrient concentrations (ammonium nitrogen, total nitrogen, total phosphorus, total potassium), short-term nitrification activity potential, and denitrification enzyme activity …
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Assessment of perennial bioenergy buffers within a row crop production system
… water quality, biodiversity loss, greenhouse gas emissions, and declining soil health). One component of multifunctional landscape design in annual row crop production is the integration of perennial bioenergy crops on marginal lands (buffers, filter strips, shelter belts, etc.) which has the …
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