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 23 for “"aircraft emissions"”.
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Microphysical modeling of ultrane hydrocarbon-containing aerosols in aircraft emissions
… soot particles, and liquid aerosols in the aircraft exhaust are involved in PM formation, and these very ne, nanometer-size particles potentially have signicant impacts on climate, human health, and air quality. In particular, the organic content of the particles is important to determine …
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Aircraft emissions reductions through improved operational performance : challenges, opportunities and policy implications
Aircraft are a significant source of emissions whose impact on local air quality and global climate change is expected to increase as the aviation industry continues to grow. Operational improvements are an attractive alternative for emissions reductions, because in addition to the environmental …
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Development of a rapid global aircraft emissions estimation tool with uncertainty quantification
Aircraft emissions impact the environment by changing the radiative balance of the atmosphere and impact human health by adversely affecting air quality. Many tools used to quantify aircraft emissions are not open source and in most cases are computationally expensive. This limits their usefulness …
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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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Assessment of a new metric system to regulate NOₓ aircraft emissions at cruise
NOₓ emissions represent the largest source of air quality impacts attributed to aircraft. The largest part of these impacts are due to emissions during cruise where 90% of fuel burn occurs. NOₓ emissions cause an increase of surface PM2.5 and O3 concentrations that adversely affect human health. …
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Evaluating the regional impact of aircraft emissions on climate and the capabilities of simplified climate model
The student, Jun Zhang, submitted this Thesis for approval on 2017-07-14 at 17:30.
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Preliminary assessment of the impact of commercial aircraft on local air quality in the U.S.
This thesis examines the impact of aircraft emissions on local air quality by performing two analyses: an assessment of U.S. commercial aircraft contribution to county budgets of primary pollutants in nonattainment areas, and an assessment of the health effects caused by commercial aircraft …
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Adjoint sensitivity analysis of the intercontinental impacts of aviation emissions on air quality and health
… to the exposure to particulate matter caused by aircraft emissions. Unlike previous studies that focus on the regional impacts from the aircraft emissions below 3,000 feet, this thesis studies the impact from emissions at all altitudes and across continents on increasing particulates in a …
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Sensitivity of the ozone layer, climate, and public health to changes in the location of aviation emissions
… and air quality varies based on the location of emissions. Changes from subsonic aircraft emissions due to regional growth, and the potential re-introduction of supersonic transport flying in the stratosphere present new scenarios that regulations do not currently address. To quantify the …
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System design and optimization of an aerial refueling system for transcontinental flights
… flights are long-haul flights, and commercial aircraft are not refueled during the flight. As a result, the fuel consumption of intercontinental flights increases exponentially with the distance travelled, because these long-haul flights consume extra fuel due to their weight gain. …
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The impacts of aviation emissions on human health through changes in air quality and UV irradiance
… latter of which are addressed in this thesis. Aircraft emissions released into the atmosphere have an impact on human health. In the context of assessing the environmental impacts of aviation-related policies, costs and benefits on human health must be considered. Two different models were …
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Benefit-cost assessment of aviation environmental policies
… climate and air quality impacts derived from aircraft emissions within the US. In addition, only landing and takeoff (LTO) emissions are considered. Barrett et al., however, has shown that aircraft cruise emissions have a significant impact on ground-level air quality. Given the time-scale and …
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Determining the temporal and spatial variations of pollutants in Toronto
… vehicular technology improvements, leading to emissions reductions. Applying two different techniques to trace pollutant measurements from air quality stations upwind, NO, NO2, NOx , and CO concentrations were found to be relatively high around Downsview and Pearson Airport, as well as the York …
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The Effect of Reducing Cruise Altitude on the Topology and Emissions of a Commercial Transport Aircraft
… conducted for alternative commercial transonic aircraft design configurations, such as the strut- braced wing and the truss-braced wing aircraft designs, in order to improve aircraft performance and reduce the impact of aircraft emissions as compared to a typical cantilever wing design. Research …
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Plume to global-scale atmospheric impacts of aviation emissions
Commercial aircraft combustion emissions impact the atmospheric composition, alter the Earth’s climate by accounting for ~4% of anthropogenic radiative forcing [72, 49] and affect surface air quality, causing an estimated ~16,000 premature mortalities per year [7, 28]. These environmental impacts …
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Sound produced by entropic and compositional inhomogeneities
… noise is central to several efforts to curb aircraft emissions. Indeed, acoustic waves originating in the combustor are a major contributor to aircraft noise. Moreover, they can act as a trigger for thermoacoustic instabilities, the consequences of which may range from decreased efficiency to …
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Design of Experiments for Contrail Avoidance
… are line-shaped clouds that form behind aircraft and contribute more to climate change each year than any other form of aircraft emissions. While most contrails have little effect on the climate because they dissipate quickly, contrails persist when they form in parts of the atmosphere …
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On potential effects from the aviation and refrigeration sectors on ozone and climate
… global ozone budget and to climate change via emissions of relevant gases and particles, subsequently followed by a complex set of chemical and physical processes. For the refrigeration sector, iodotrifluoromethane (CF3I) and methyl iodide (CH3I) are two very short‐lived substances (VSLSs) with …
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Flugzeugmessungen von NO, NOy, CO und O3 in der freien Troposphäre zwischen 60 °N und 60 °S - Nord-Süd-Kontrast und Verteilung in den Tropen
… of NO, NOy, CO and O3 performed on board the DLR aircraft Falcon are used to examine the interhemispheric differences for midlatitudes during local autumn. The measurements were part of the INCA campaign (Interhemispheric differences in cirrus properties due to anthropogenic emissions). Major …
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Study on impacts of aviation emissions and related dynamics and chemistry
… raises questions about the effects of resulting emissions on the environment. The upper troposphere and lower stratosphere (UTLS), where most of aviation emissions occur, plays an important role in climate and atmospheric chemistry. The main purpose of this study is to investigate, using …
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