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 35 for “"Long-range transport"”.
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Long Range Transport of Microorganisms in the Upper Atmosphere
… are abundant in the atmosphere and can be transported globally on winds. In general, the upper atmosphere is an understudied, extremely harsh environment where the limits of life can be tested unlike anywhere else on our planet. However, the challenge of collecting samples (and historic …
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Impacts of long-range transport of biomass burning on air quality in Texas.
… the physical and chemical properties of transported biomass burning (BB) smoke and their impact on background air quality in Port Aransas, an industrialized coastal site in Texas. To achieve these objectives, mobile and stationary field experiments were conducted to measure the impact of …
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Unraveling atmospheric physics and chemistry of long-range transport of pollutants: Development of novel tools and methods
Long-range transport (LRT) of pollutants causes changes in background concentrations of pollutants (e.g., ozone, O3; and nitrogen dioxide, NO2) and alarming high peaks of unhealthy criteria pollutants (e.g., particulate matter, PM; and carbon monoxide, CO) in downwind regions. As the chemical …
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Investigating the Impacts of Meteorology and Long-Range Transport on near Surface and Free Tropospheric Ozone over Texas
… topic of my thesis focused on understanding long-term trends in ozone and meteorological patterns over Dallas Fort Worth metropolitan area. In order to do this, I utilized surface ozone observations from the Texas Commission for Environment Quality (TCEQ)’s CAMS and the United States …
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Vapor scavenging by atmospheric aerosol particles
… play a role, such as cloud formation and long range transport.
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Seasonal Pattern and Sources of Particulate Carbon in Kananaskis and Calgary, Alberta
… and tourism in Kananaskis. Sources from long-range transport impact both locations simultaneously. A lower boundary layer at night concentrates TC and a higher boundary layer in the day lower the concentration in both locations. OC is much more easily removed by precipitation than EC due …
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Evolving air quality and impact of changing climate
… uses the global model simulation to investigate long-range transport of pollutants from North America to Pico Mountaintop Observatory (PMO) in the North Atlantic. HYSPLIT backward trajectories were used to analyze origin of air mass at PMO. The trajectory analyses showed that more than 50% of the …
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Sensitivity of tropospheric chemistry to the source of NO x from lightning : sensitivity simulations with the global 3D chemistry model for atmospheric transport and chemistry MATCH-MPIC
… oxides is studied using the global chemistry transport model MATCH-MPIC. The responses of NOx, O3, OH, HNO3 and peroxyacetyl-nitrate (PAN) are investigated. A marked sensitivity to both parameters is found. NOx burdens globally can be enhanced up to 100% depending on the vertical placement and …
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Environmental Fate of Animal Manure-associated Antibiotics and Seed-coated Pesticide in Soils
… into the soil. This suggests the potential for long-range transport of seed-coated neonicotinoids.
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Multi-Scale Atmospheric Dynamics of Extreme Saharan Dust Storms Resulting in Dust Transport Out of Africa to Iberia and the Atlantic
… Saharan dust plumes and their subsequent long-range transport is a major global concern. However, the state-of-the-science of the meteorological forcing mechanisms for dust emission over the complex terrain of North Africa is incomplete due to very few upper-air and ground-based …
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Tracking Potential Sources of Peak Ozone Concentrations in the Arabian Gulf Region
… ozone concentrations in the 6-12 km altitude range above the subsidence inversion in the month of August. The spatial coordinates of the ozonesondes at 6, 9, and 12km were obtained through the use of Global Positioning System (GPS) data acquired by the attached radiosonde, and HYSPLIT (Hybrid …
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Exploiting AI to understand microtubule orientation in neurons
… this unique microtubule configuration, and thus long-range transport, remains unknown. In my thesis, I developed several machine learning algorithms for microscopy image analysis that exploit novel developments in deep learning. The first tool I developed, KymoButler, enabled me to automatically …
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Fate of Current-use Pesticides in the Canadian Atmosphere
… used despite their persistence and potential for long-range transport (LRT). We have applied and refined an XAD-2 resin-based passive air sampler (PAS) to study the concentrations of pesticides in the atmosphere. A set of laboratory experiments measured the equilibria sorption coefficients for …
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Atmospheric chemistry and aerosol associated with the coastal urban environment
… that impact new particle formation (NPF). Long-term monitoring demonstrated that PM2.5 (particles with diameters of 2.5 m or smaller) concentrations are ~30% larger on days with southerly wind or sea breeze recirculation compared to those under other wind patterns. On southerly wind days, …
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Development of regionalized multimedia chemical fate models for China
… parameters on chemical persistence and long-range transport potential. The environmental distribution of benzo[a]pyrene (BaP) in the base year of 2007 and future scenario in 2030 in China has been predicted using SESAMe v3.0. The efficiency of different technical improvements on reducing …
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Self-organization of Cu-based immiscible alloys under irradiation: an atom-probe tomography study
The stability of materials subjected to prolonged irradiation has been a topic of renewed interest in recent years due to the projected growth of nuclear power as an alternative energy source. The irradiating particles impart energy into the material, thereby causing atomic displacements to occur. …
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Characterization of Uranium and Rare Earth Element Mobility and Attenuation Downstream of Decommissioned Tailings Impoundments at the Bicroft Mine near Bancroft, Ontario
… system for 55 years, demonstrating the potential longevity and viability for long-term sequestration of U and REEs through natural attenuation. To identify U and REE hosts and their stability in the natural environment, colloids, tailings, stream and wetland sediments were analyzed using various …
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Low Reynolds Number Settling of Cylindrical Rods with Various Geometries in a Quiescent Fluid
This dissertation is motivated by the atmospheric transport of microplastic fibres, a growing environmental concern. The atmosphere is recognized as a major pathway for the long-range transport of microfibres. However, many atmospheric simulations simplify fibre geometry, often representing them as …
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Feedbacks between plants, flow, and particle fate
… on flow profiles has been investigated, the transport of particles within vegetated canopies remains poorly understood. In this thesis I present the results from laboratory experiments and numerical modeling that investigated particle fate and transport around emergent and submerged model …
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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
… and biogenic sources, and pollutant transport. Moreover, to evaluate the projection uncertainties resulting from different plausible trends of climate and emissions as a result of unknown human-related activities and climate variations, three IPCC SRES scenarios, A1FI, A1B and B1, are …
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