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 12 of 12 for “"aerosol chemistry"”.
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Aerosol chemistry and air-snow transfer in coastal Antarctica
… are to better understand the sources of aerosol particles reaching coastal Antarctica, and the processes that control aerosol deposition to the snow surface and inclusion into the ice.<br></br><br></br>Daily collections of aerosol particles and surface snow samples were made from British …
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Understanding the chemistry of atmospheric particles using single particle mass spectrometry
… processing techniques to provide new kinds of aerosol chemistry measurements. Most of this work has been carried out using the Particle Analysis by Laser Mass Spectrometry (PALMS) instrument, an aircraft deployable mass spectrometer that uses intense (~10 9 Wcm -2 ) UV laser pulses to vaporize …
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The impact of volcanic halogens, climate change, and sulfate aerosol geo-engineering on the atmospheric effects of volcanic eruptions
… halogens, climate change, and concurrent sulfate aerosol geo-engineering would alter the atmospheric effects of sulfur-only explosive volcanic eruptions has, previously, been under-researched. In this thesis, aerosol-chemistry-climate model simulations are utilised to show that the co-emission of …
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Instrument development for exploring the influence of interfacial chemistry on aerosol growth, aging, and partitioning of gases
Investigation of aerosol chemistry and growth under atmospheric conditions in a novel rotating aerosol suspension chamber with cavity ring-down spectroscopy provided key insight into the effect of pollutants and other vapors on the overall atmospheric lifetime of particulate matter. The Atmospheric …
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MEASUREMENTS OF ATMOSPHERIC RADICALS IN AMBIENT AND INDOOR ENVIRONMENTS: OUTDOOR-INDOOR RELATIONSHIPS, INDOOR FORMATION MECHANISMS, AND INSTRUMENTAL ANALYSIS
… atmospheric oxidation, critically altering the chemistry of the air we breathe. Radical reactions initiate oxidation of volatile organic compounds (VOCs), which in the presence of nitrogen oxides (NOx) can form ozone and secondary organic aerosols (SOA)—air pollutants affecting human health and …
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Influence of recent Asian SO₂ and Asian NOx̳ emissions change (2001 to 2010) on particulate matter : shifts in Asian sulfate enhancement over US surface, major production pathway, and lifetime
… chemical transport model with coupled oxidant-aerosol chemistry (GEOSChem) is used to analyze the influence of recent (2001 to 2010) growth in Asian NOx and Asian SO 2 emission on transpacific transport of Asian particulate matter, especially sulfate, by quantifying and analyzing the details of …
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Toward assessing the effects of aerosols on deep convection: a numerical study using the WRF-Chemistry model
As the formative agents of cloud droplets, aerosols play an undeniably important role in the development of clouds and precipitation. Few meteorological models have been developed or adapted to simulate aerosols and their contribution to cloud and precipitation processes. The Weather Research and …
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Urban-scale impacts on the global-scale composition and climate effects of anthropogenic aerosols
… important species (VOCs, PAN, OC, and sulfate aerosol) usually have their weighted RMS error less than 10% as well, except for a small number of cases. These cases, in which the highly non-linear nature of the processing is too large for the third order metamodel to give an accurate fit, are …
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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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Understanding the formation of secondary organic aerosol and the fates of organic nitrates formed from monoterpene oxidation
Secondary organic aerosol (SOA) contributes to a substantial fraction of fine particular matter (PM2.5) that imposes adverse health effects, large uncertainty in radiative forcing, and poor visibility. Monoterpenes represent about 15% of the annual emissions of biogenic volatile organic compounds …
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Simulating the Effects of Hydroclimate Stress on BVOC-Chemistry-Climate Interactions in NASA GISS ModelE
… a precursor to ozone (O3) and secondary organic aerosols (SOA). In the second chapter, the implementation of isoprene drought stress into the Model of Emissions and Gases and Aerosols from Nature (MEGAN) module in the NASA GISS ModelE, an earth system model, is described along with validation of …
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Investigating the Molecular Composition of Rainwater and Secondary Organic Aerosol using Ultra-High Resolution Mass Spectrometry
… complete molecular characterisation of organic aerosol. However atmospheric aerosol often has complex, mixed organic and inorganic composition and soft ionisation techniques that have been developed to ionise organic aerosol specifically, are susceptible to salt suppression effects and …