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 68 for “"anthropogenic emissions"”.
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Historical anthropogenic emissions of carbon monoxide, 1850 - 2000
… to build the historical emission inventory. CO emissions increased almost linearly until 1950, totaling about 84 Tg in 1850, 128 Tg in 1900, and 209 Tg in 1950. Residential biofuel combustion has been the dominant source during that period. After 1950, there is a rapid increase of CO emissions …
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Exhausted with Emissions: Exploring the Link Between Anthropogenic Emissions and Urban Pollution on Public Health
… we investigate how reducing transportation emissions and other anthropogenic emissions of NOx affects local and national public health in two heavily populated and polluted areas: Los Angeles, CA and New York City, NY. We estimate the Tipping Point (TP) as well as the Break-Even Point (BEP) …
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Characterizing the influence of anthropogenic emissions and transport variability on sulfate aerosol concentrations at Mauna Loa Observatory
… forcing mechanisms (Meehl et al., 2007). Emissions of sulfur dioxide, the primary precursor of sulfate aerosol, are now globally dominated by anthropogenic sources as a result of widespread fossil fuel combustion. Economic development in Asian countries since 1990 has contributed …
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Attribution of PM₂.₅ Health Impacts in Asia-Pacific
Asia-Pacific anthropogenic emissions have changed rapidly in recent years due to industrialization, increasing mobility, and emissions controls. Although these changes have altered the region's burden of premature mortalities due to ambient fine particulate matter (PM₂.₅), the contribution of each …
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The Changing Role of Reactive Nitrogen in the Troposphere
… the natural nitrogen cycle, primarily via emissions of reduced nitrogen from the production and use of fertilizer for agriculture and of oxidized nitrogen from the combustion of fossil fuels. Nitrogen oxides play a central role in driving tropospheric chemistry and are a key ingredient of …
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Coastal urban atmospheric mercury cycling and emissions in Boston, MA
… to the body of knowledge regarding mercury emissions by reporting on a coastal, urban setting subject to inputs from both anthropogenic and oceanic reservoirs, in order to improve related policy decisions. Mercury can have serious health and ecological consequences, but the chemistry, …
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Modelagem dos processos físico-químicos e atmosféricos envolvidos na formação de oxidantes fotoquímicos em megacidades: o caso da região metropolitana do Rio de Janeiro
… composed of a meteorological model, biogenic / anthropogenic emissions and air quality, implemented and adequate in a high performance computational platform, for the understanding of dynamic, thermodynamic and physico-chemical processes that impact on the formation of Photochemical oxidants in …
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Mercury Supply at Artisanal and Small-Scale Gold Mines in Africa: Actors, Distribution and Networks
… responsible for close to 40 percent of global anthropogenic emissions of mercury, donors and international NGOs have pushed to minimize – and where possible, eliminate altogether – its use. Findings reveal that mercury distribution and supply networks are firmly entrenched, populated by actors …
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Interannual variability of air-sea fluxes of carbon dioxide and oxygen
… observed increase in atmospheric CO2 due anthropogenic emissions is substantially slowed by natural processes that incorporate CO2 into the terrestrial biota and the ocean. Year-to-year changes in the CO2 growth rate that exceed variations in the fossil fuel source indicate a significant …
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The potential for a nuclear renaissance : the development of nuclear power under climate change mitigation policies
Anthropogenic emissions of greenhouse gases are very likely to have already changed the Earth's climate, and will continue to change it for centuries if no action is taken. Nuclear power, a nearly carbon-free source of electricity, could contribute significantly to climate change mitigation by …
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Spatial and Temporal Distribution of Speciated Atmospheric Mercury in Southeastern Texas
… to investigate and compare the contribution of anthropogenic emissions to the levels of atmospheric mercury in both urban and coastal settings of southeastern Texas. Speciated atmospheric mercury measurements were obtained from the ideally located University of Houston Moody Tower and University …
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Estimating source strengths and lifetime of Nitrogen Oxides from satellite data
… the atmosphere has changed significantly due to anthropogenic emissions. Nitrogen oxides (NO+NO2) play an important part, as they directly affect human health and environment, and are involved in chemical key reactions, leading to ozone production in the troposphere. Spectral measurements from …
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Induced technical change in computable general equilibrium models for climate-change policy analysis
… dioxide concentrations by drastically reducing anthropogenic emissions of carbon. Such reductions require limiting the use of fossil fuels-which supply the bulk of energy to economic activity, and for which substitutes are lacking-which is feared will cause large energy price increases and …
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Simulations and projections of major air pollutants over the United States and uncertainty analyses, effects of natural change and human activities
Changes in global climate and pollutant emissions are very likely to continue in the coming decades driven by the human-related activities and natural fluctuations in the Earth climate system. These potential changes would have very important consequences on regional air quality over the contiguous …
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Interactive effects of elevated carbon dioxide concentration with nutrient availability and leaf development on plant carbon metabolism
… ecosystems to offset ~2-3 Gt CO2 yr -1 of anthropogenic emissions. Rising atmospheric CO2 concentration ([CO2]) this century will impact plant photosynthesis and respiration with consequences for plant productivity in natural and agro-ecosystems. The capacity of all plants to grow and …
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Climate Impact Analysis of Direct Air Capture Deployment
Direct air capture (DAC) is a negative emissions technology (NET) that can contribute to mitigating climate change impacts by extracting CO₂ from the atmosphere. Given its low technical maturity, uncertainties persist regarding DAC's cost, scalability, and life-cycle emissions. In this analysis I …
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Preliminary investigation of light scattering and visibility in two eastern national parks
… indicate the potential for adverse impacts of anthropogenic emissions and secondary pollutants due to meteorological and topographic conditions existing in and around the two parks. The results of this study will aid Federal land managers and legislators in developing environmental policy for …
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Projections of Future Changes in Surface Ozone Concentrations Over the United States, Effects of Pollutant Transport, and Uncertainty Analyses
… change, resulting changes in biogenic precursor emissions, and changes in anthropogenic precursor emissions within and outside the contiguous U.S. territory. Considering the uncertainties in ozone projections, two cases of potential changes in climate and precursor emissions are compared, …
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