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 36 for “"atmospheric aerosol"”.
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Vapor scavenging by atmospheric aerosol particles
… composition, and activity) and, thus, influence atmospheric phenomena in which particles play a role, such as cloud formation and long range transport.
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A photophonic instrument concept to measure atmospheric aerosol absorption
… to measure the absorption of solar radiation by atmospheric aerosols was designed, built and tested. The concept was based on the photophonic phenomenon discovered by Bell and an acoustic resonator developed by Helmholtz. The design consisted of two chambers: an aerosol chamber and a reference …
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Parametric and structural uncertainties in modeling dry deposition of atmospheric aerosol particles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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EXPLOITING ADVANCED ATMOSPHERIC AEROSOL CHARACTERISATION TO DEVELOP CUTTING-EDGE APPROACHES FOR SOURCE APPORTIONMENT
Atmospheric aerosols are very complex systems due to the huge variety of emission sources, size distributions, chemical properties, and transformation processes. Although the characterisation of atmospheric aerosols is still challenging, their study is essential since they have different impacts …
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SET-UP OF INNOVATIVE EXPERIMENTAL METODOLOGIES FOR THE ATMOSPHERIC AEROSOL CHARACTERISATION AND SOURCE APPORTIONMENT
… of innovative experimental methodologies for the atmospheric aerosol characterisation and apportionment. Many issues are still open in aerosol science. Among them, the identification and quantification of PM sources and the separation between natural and anthropogenic contributions were explored …
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Characterization of the physical, chemical, and optical properties of atmospheric aerosol particles in New Hampshire
<p>Tropospheric aerosol particles directly affect the radiative budget of the Earth, and degrade visibility, by scattering and absorbing short-wavelength solar radiation. However, the radiative effect of aerosols is highly uncertain due to the non-uniform spatial distribution of the particles over …
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Atmospheric Aerosol Particle Formation : Aircraft-Based Mass Spectrometric Measurements of Gaseous and Ionic Aerosol Precursors
The condensational growth of aerosol particles and the formation of fresh, nanometer-sized particles depend primarily upon the presence of H2SO4. Atmospheric ions produced by cosmic rays can initialize the formation of clusterions, which subsequently may grow by mutual coagulation and condensation …
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CARBON DIOXIDE LASER RADAR FOR MONITORING ATMOSPHERIC TRANSMITTANCE AND THE ATMOSPHERIC AEROSOL (REMOTE SENSING, INFRARED).
… techniques to permit the determination of atmospheric transmittance and aerosol backscatter from multi-angle lidar returns. This work has been motivated by the need for a more complete knowledge of the optical properties of the atmosphere in the 9 to 11 μm spectral region. Results of …
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Influence of environmental parameters on atmospheric aerosol size distributions in a South African coastal zone
Aerosols are microscopic solid or liquid particles suspended in the atmosphere, which impact and are impacted by many physicochemical processes related to climate. By scattering and absorbing solar radiation and acting as cloud condensation nuclei, they have both a direct effect and indirect effect …
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Aircraft based measurements of atmospheric Sulfur Dioxide and ground based measurements of gaseous Sulfur (VI) in the simulated internal flow of an aircraft engine: Implications for atmospheric aerosol formation
… promote the formation and growth of sulfate aerosol particles which play an important role in the chemistry of the troposphere and perhaps even in climate. An Ion Trap Mass Spectrometer specially adapted for in flight measurements was employed in the aircraft campaign. Several high resolution …
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Development of a multispectral albedometer and deployment on an unmanned aircraft for evaluating satellite retrieved surface reflectance over Nevada's Black Rock Desert
Accurate atmospheric aerosol characteristics derived from satellite measurements areneeded over a variety of land surfaces. Inhomogeneous and bright surface reflectanceacross California and Nevada may be a contributing factor in the discrepancies observedbetween ground based and satellite-retrieved …
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Millimeter Through Visible Frequency Waves Through Aerosols: Particle Modeling, Reflectivity and Attenuation
This thesis addresses the problem of modeling atmospheric aerosol (such as haze and fog) particle-size distributions in order to predict the effects (such as attenuation and reflectivity) that these particles have upon the propagation of electromagnetic waves of micrometer range wavelengths. …
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Investigations of cloud altering effects of atmospheric aerosols using a new mixed Eulerian-Lagrangian aerosol model
… altered the composition and size-distribution of atmospheric aerosol particles over the last century. This, in turn, has altered cloud albedo, lifetime, and patterns which together are thought to exert a negative radiative forcing on the climate; these are the indirect effects of atmospheric …
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Atom-Based Computer Simulation Studies of Gas-to-Liquid Nucleation in Atmospherically Relevant Systems: Clarifying Discrepancies and Elucidating Mechanisms
… systems. Our results are very relevant to atmospheric aerosol formations but may also find its applications in drug encapsulations and the design of nanomaterials as well as in sorting out experimental and theoretical discrepancies. This dissertation outlines the results of a series of …
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Role of Water in the Formation, Transformation and Fate of Secondary Organic Aerosol
Particle-phase water is the most abundant atmospheric aerosol constituent, yet the importance of water for the formation, transformation and fate of secondary organic aerosol (SOA) remains not fully characterized. In order to address this knowledge gap, this thesis explores the role of water in SOA …
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Computer Simulation of Ion-Induced Nucleation in the Presence of Single Ions and Ion Pairs
Atmospheric aerosol particles play an important role in climate and human health. Despite their importance, the mechanisms of their formation are still poorly understood. Ion-induced nucleation may play a role in the process, but details are lacking about how the nucleation rate depends on the …
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Chemistry of carbonaceous aerosols : studies of atmospheric processing and OH-initiated oxidation
Carbonaceous aerosols are among the most prevalent yet least understood constituents of the atmosphere, particularly in urban environments. We have performed analyses of field samples and laboratory studies to probe the physico-chemical properties of soot and organic aerosols in a complimentary …
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Cellular and acellular assays for measuring oxidative stress induced by ambient and laboratory-generated aerosol
Exposure to atmospheric particulate matter (PM) is a leading global health risk with various proposed mechanisms of action, including the induction of oxidative stress through PM-initiated production/release of reactive oxygen and nitrogen species (ROS/RNS). This dissertation explores cellular and …
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Global to Glocal: A Confluence of Data Science and Earth Observations in the Advancement of the SDGs
… 3 (Good Health and Well-being): The influence of atmospheric aerosols on the fatality rate for COVID-19 was studied. Results suggested that atmospheric aerosol optical depth may be a factor in estimating the coronavirus fatality rate, though uncertainties in the analytical results could be …
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Bioavailable Iron in Equatorial Pacific Ocean Aerosol Samples
… the mechanisms that control Fe speciation in atmospheric aerosol particles before and after deposition into the surface ocean remain largely unknown. This is in part due to the analytical challenge of quantifying Fe at environmentally significant sub-nano molar levels. The flow injection …
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