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 22 for “"Air quality model"”.
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Modification of an ambient air quality model for assessment of US naval aviation emittants.
Two programs which form part of a generalized air quality assessment model for USAF operations were obtained and analyzed. Areas of incompatibility with USN aircraft operations were identified and modified to closely approximate these operations. Data were obtained by observation of operations at a …
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Implementing and Improved Soil NOx Parameterization in the Community Multiscale Air Quality Model: Implications for Air Pollution
Soil NO emissions are critical to accurate atmospheric simulations which inform decisions to protect human health. Several studies indicate that the scheme, Yienger and Levy 1995 (YL95), underestimates soil NO emissions by a significant amount. The Berkeley Dalhousie Soil NOx Parameterization …
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The impacts of aviation emissions on human health through changes in air quality and UV irradiance
World-wide demand for air transportation is rising steadily. The air transportation network may be limited by aviation's growing environmental impacts. These impacts take the form of climate impacts, noise impacts, and health impacts, the latter of which are addressed in this thesis. Aircraft …
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Modeling Interactions of Aircraft Emissions With Global and Regional Atmospheric Chemistry and Climate
… we have focused on analyzing the impact of aircraft flights from Chicago O'Hare and Midway Airports on the regional air quality of the region using the Community Multiscale Air Quality Model (CMAQ) system. Our results suggest that the aircraft traffic at the Chicago O'Hare and Midway …
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An air pollution model for complex terrain
A dynamic air quality modeling system is presented for use in regions of complex terrain. It consists of two pre-processors and the air quality model. TERRAIN is the terrain analysis preprocessor. It accepts as input digitized terrain elevation data and analyses it in terms of the orientation and …
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Cost-benefit analysis of ultra-low sulfur jet fuel
… full cost-benefit analysis, including impacts on air quality, climate, operations, and lifecycle costs is necessary to justify such a policy. The cost of a ULS jet fuel policy is well-characterized by the adoption of ULS diesel fuel, similar to jet fuel, for ground transportation in the US and …
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Beyond Health Co-Benefits: Air Quality-Related Equity Implications of US Decarbonization Policy
… change are often associated with emissions of air pollutants that react to form fine particulate matter (PM2.5), which is a significant cause of premature mortality and disproportionally harms people of color and low-income populations in the U.S. Ambitious climate policy to decarbonize the …
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Development and Evaluation of a Comprehensive Tropospheric Chemistry Model for Regional and Global Applications
… emissions must employ a tropospheric chemistry model that predicts realistic distributions of aerosols of all types. The need for a such a comprehensive yet computationally efficient tropospheric chemistry model is addressed in this research via systematic development of the various …
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Modeling secondary organic aerosol formation from biogenic hydrocarbons
… Atmospheric Chemistry Mechanism (CACM) and the Model to Predict the Multi-phase Partitioning of Organics (MPMPO) were updated with detailed chemistry associated with three monoterpene species---alpha-pinene, beta-pinene, and d-limonene. The updated CACM and MPMPO modules were calibrated by ozone …
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Improving a priori emission estimates using network observations and a perturbed emissions ensemble: a study in Beijing
Emissions inventories are essential inputs in air quality modelling from global to local scales, but they also represent a major source of uncertainty in the simulation outputs. Uncertainties may be propagated from the underlying data used to compile the emissions inventories or they can arise from …
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Impact of two potential policy options on atmospheric chemistry and climate: hydrogen economy and low-GWP alternatives to ozone depleting substances
… change due to greenhouse gas emissions, and air pollution due to fossil fuel combustion. This research analyzes the impacts of two potential future policy options, (1) hydrogen economy and (2) low-GWP (Global Warming Potential) alternatives to hydrofluorocarbons (HFCs) and …
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Reducing the air quality impacts of aircraft activity at airports
Air transportation is an integral part of the economy and the transportation infrastructure. However, aircraft activity at airports generates CO2 emissions that affect the climate and other pollutants that affect air quality and human health. The focus of this thesis is to enable the reduction of …
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Efficient Computational Tools for Variational Data Assimilation and Information Content Estimation
… procedure to combine data from observations with model predictions to obtain a more accurate representation of the state of the atmosphere. As models become more complex, determining the relationships between pollutants and their sources and sinks becomes computationally more challenging. The …
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Technology-based past and future emission inventories for the transportation sector
… inventories are necessary inputs to atmospheric models in determining air quality, health, and climate impacts. Transportation sector contributes greatly to emissions of all kinds of pollutants, thus it is crucial to understand its emissions and impacts. This dissertation improves the accounting …
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Non-CO₂ environmental impacts of transportation fuel use and production
… one of the largest contributors to anthropogenic air pollution and global climate change. This thesis aims to quantify three specific environmental impacts from transportation fuel combustion and production: 1) Health impacts from transportation combustion emissions in the United States. A …
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A response surface model of the air quality impacts of aviation
… to mitigate the impacts of aviation on climate, air quality, and noise by setting various emissions and noise regulations. However, there are complex interactions among these three impact pathways which must be carefully considered. The FAA is developing an integrated suite of software tools to …
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Impact of spatial and temporal distribution of ammonia emissions from chemical fertilizer usage on predictions of air quality in the Midwest United States
… nitrogen deposition using chemical transport models (CTMs), require representative NH3 emission inventories that capture source specific spatial and temporal variability. Of particular interest are NH3 emissions from chemical fertilizer usage for agriculture that are highly uncertain due to …
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