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 34 for “"wet deposition"”.
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Determination of Toxic Heavy Metals in Wet Deposition and Ambient Air in Columbus, GA
… that exist suspended in the air are subject to wet and dry atmospheric deposition. From the air they may be released by precipitation events or direct dry deposition unto various environmental compartments near or far from their sources. These have caused increased concern since they are known …
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Trace metal applications in atmospheric and watershed dynamics: Case studies of mercury deposition in New England and bedrock groundwater-surface water mixing
… the atmospheric chemistry of Hg and the wet and dry deposition of this toxic element. Chapter II presents results from Hg wet deposition measurements and ambient reactive gaseous Hg (RGM) measurements collected at Thompson Farm located in Durham, NH over a 3 year time period. The duration …
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Wet and Dry Atmospheric Deposition of Nutrients and Bioactive Trace Metals to Coastal Waters of the Mid-Atlantic Bight
<p>Atmospheric deposition provides a significant source of nutrients and bioactive trace metals to the surface ocean, including the seasonally oligotrophic waters of the Mid-Atlantic Bight. These atmospherically derived nutrients and trace metals enter the surface ocean via dry deposition of …
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Atmospheric Mercury Deposition In An Urban Environment
Atmospheric mercury deposition, known to be a major source of mercury to aquatic and terrestrial environments, was studied at an urban site in Orlando, FL. Precipitation sampling was conducted from September 2003 to May 2006 at a Mercury Deposition Network site located on the University of Central …
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Does pubescence increase uptake of nutrient deposition on leaves?
… water uptake and nitrogen absorption from wet deposition for 12 Proteaceae species from the CFR, under controlled conditions; (ii) evaluating the relationship between leaf pubescence and plant height of 39 Proteaceae species from the CFR and (iii) comparing visual scores of pubescence with …
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The study of a drug coating applied using a cold atmospheric plasma: everolimus coating properties
… alternative by reducing thermal damage during deposition. The BioDepTM unit, a custom-built CAP system developed by TheraDep Ltd has been used for depositing various biologics and therapeutics on different substrates. In this study, the BiodepTM system was used to deposit everolimus onto …
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Aerosol chemistry and air-snow transfer in 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 Antarctic Survey base, Halley. Aerosol and snow sea salt were found to have maximum …
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Cosmogenic ³²P and ³³P in the atmosphere and aligotrophic ocean and applications to the study of phosphorus cycling
… beta activities in rainwater and plankton. The wet deposition rates of P-32 and P-33 were determined during 12 months at a marine site, at Bermuda, coinciding with measurements of the activities and activity ratio P-33/P-32 in suspended particles and plankton tows at BATS station. The in situ …
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The Temporal and Spatial Distribution of Hydrocarbons in Atmospheric Deposition From Stations Surrounding Lower Chesapeake Bay
… concentrations were determined in bulk, wet, and dry deposition samples from urban and non-urban locations surrounding lower Chesapeake Bay. Mean hydrocarbon concentrations in bulk deposition samples were over three times greater at the urban station indicating a localized source. The …
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Science to support toxics governance : tracking mercury and other pollutants from policy to impacts
… that the benefit of avoided emissions and deposition over Asia are large, even when considering a scenario where the Convention allows large flexibility in implementation. These benefits are primarily driven by India, where even modest improvements in mercury capture are projected to result …
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Effects of Acid Deposition and Changing Climate on the Hydrochemistry and Critical Loads of Watersheds in the Adirondack Region of New York
<p>Despite decreases in acidic deposition since the 1970s, the recovery of surface waters from acidification has been limited primarily due to the depletion of exchangeable base cations, net mineralization of organic sulfur and nitrogen and release of previously retained SO42- and NO3-, and …
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Dry deposition of sulfate and nitrate to soybeans and corn
Dry deposition contributes a substantial part, perhaps one-third to one-half, of the total mass loadings of acidic pollutants and acid precursors to agricultural systems. However, because of the relative intractability of measurement of dry deposition fluxes, little work has been done to directly …
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A Statistical Methods-Based Novel Approach for Fully Automated Analysis of Chromatographic Data
… on these compounds, particularly the impact of wet deposition through precipitation scavenging on gas- and particle-phase oxygenated compounds. Hourly removal rates for all analytes were estimated by examining the impacts of precipitation on their concentration.
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Hydrogeological investigation of the Naukluft mountains, southwest Namibia
… season of 2008/2009 calculated considering only wet deposition values for chloride. Places in the Naukluft Karst Aquifer area receive more rainfall and slightly higher recharge than calculated. Reconnaissance pumping tests were conducted in a well and boreholes at Leybank, Naukluft Park office, …
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The microstructure and properties of unbalanced magnetron sputtered CrN[x] coatings.
… to protect engineering components is the deposition of hard chromium by electroplating. The coatings are known to be quite thick (up to 20 mum), reasonably hard (-HV1000), but contain micro-cracks. This wet deposition process is well understood, but it has technical limitations and is …
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Studies of mercury in water, sediment, and fish in Mississippi: Concentrations, speciation, cycling, and isotopic composition
… and runoff from urban, agricultural, and wetland/forest areas, which flow into the Yocona River. A range of water quality parameters were measured to determine the primary factors controlling the distribution and transport of Hg species in the watershed. Concentrations in the fish …
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A Better Tropospheric Aerosol Analysis and Forecast Using Data Assimilation and Coupled Modeling
… for sulfate and ammonium) and loss via the wet deposition process (~-3.79% decrease for nitrate). In the third chapter, to estimate top-down NOx emissions over East Asia, we applied an inverse modeling technique with tropospheric NO2 column from TROPOMI in the spring of 2019. We found a …
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Planetary Science Meets Chemistry: Studying Potential Biosignature Gases in Terrestrial Exoplanet Atmospheres
… high water solubility of HCl means that wet deposition can efficiently remove it from the atmosphere, preventing HCl from accumulating to detectable levels in the atmosphere. Overall, my thesis aims to improve our understanding of biosignature gases and provide more diverse research …
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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
… the emission, transport, transformation and deposition of atmospheric mercury (Hg) in three forms: elemental mercury (Hg0), reactive mercury (HgII), and particulate mercury (HgP). It is tested by using the NCEP/DOE AMIP II reanalysis meteorology data. The result shows the model can simulate …
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Improving model representations of black carbon using a particle-resolved aerosol model
… mechanism of BC mass from the atmosphere is wet deposition, with one important pathway being the activation of BC-containing particles into cloud condensation nuclei (CCN) and their subsequent removal if the cloud precipitates. Although freshly emitted BC-containing particles are too small …
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