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 37 for “"dry deposition"”.
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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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An investigation into the effects of complex topography on particle dry deposition
… to predict the spatial variation of particle dry deposition following a nuclear accident. The interaction of landscape features, atmospheric flow and particle dry deposition has been investigated with this in mind. Wind tunnel studies have been used with computational fluid dynamics to predict …
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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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Investigation into the mechanisms of size-resolved particle dry deposition across three environments
… defined by their rate of removal through wet and dry deposition. Dry deposition, specifically of accumulation mode aerosols (0.1 – 1 µ), is one of the largest sources of uncertainty in global models. The processes that influence deposition are poorly constrained and few comprehensive measurements …
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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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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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Seasonal Pattern and Sources of Particulate Carbon in Kananaskis and Calgary, Alberta
… organic carbon(OC), and total carbon from dry deposition and precipitation in Kananaskis and Calgary were assessed using thermo-optical methods. Vehicle exhaust was inferred to be dominant source of carbon throughout the year with an identical OC/EC of 22±14 in Calgary and 22±5 in …
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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 major …
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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 of this …
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The Changing Role of Reactive Nitrogen in the Troposphere
… we investigate the utility of long-term wet and dry deposition measurements made in the continental United States as a constraint on regional anthropogenic emissions trends of acid rain precursors (nitrogen and sulfur oxides). We find that dry deposition fluxes follow anthropogenic emissions …
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Vehicular Ammonia Emissions in Baltimore, Maryland
… ammonia may also be transported through wet and dry deposition to water bodies such as the Chesapeake Bay, contributing to excess nutrient loadings that cause eutrophication. Vehicle exhaust contains ammonia, created by a reaction of NOx with H2 in the three-way catalytic converter. Ammonia …
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Bulk deposition of pesticide mixtures in a Canadian prairie city and the influence of soil temperature fluctuations on 17β-estradiol mineralization
… for 71 pesticides in weekly bulk (wet + dry) deposition samples collected from May 25 to September 21 over two years at two sites in the City of Winnipeg, Canada. Twenty-one pesticides and their metabolites were detected in this study and 99% of samples collected contained mixtures of two …
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Characterization of Atmospheric Particulate Matter in Mountaintop Mining and Non-mining Areas in West Virginia with Known Health Differences
… inhaled deposited dose, and environmental dry deposition.;Methods/Results: In the first study, particle size distribution and concentration data were collected to calculate deposited lung dose at MTM and non-mining sites. This study was divided into two parts to examine variability in …
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A study of the dissolution of atmospherically derived trace metals into North Atlantic seawater
… metals from aerosols into seawater from wet and dry deposition, with a focus on important trace metals: manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu) and lead (Pb). To this end, aerosol and rainwater samples were collected from Tudor Hill (Bermuda) and Penlee Point (Cornwall) …
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The contribution of fog to the moisture and nutritional supply of Arthraerua leubnitziae in the central Namib Desert, Namibia
… essential nutrients for plants. Furthermore, dry deposition can be an important input of nutrients to many ecosystems, but without water, dust deposited on leaves or on soil is inaccessible for plant uptake. In other studies of coastal ecosystems (e.g. Strandveld), it has been found that this …
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MERCURY IN BIG CYPRESS BAYOU AND CADDO LAKE WATERSHEDS IN MARION AND HARRISON COUNTIES TEXAS
… to mercury. Previous research has focused on dry deposition from fossil fuel combustion as the primary source of mercury but has not addressed the potential watershed contribution to mercury concentrations in Caddo Lake.</p> <p>Big Cypress Bayou flows through Harrison and Marion counties in …
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Applications of nanoimprinted structures to organic photovoltaics
… the nanoscale features was achieved using an all-dry deposition process.
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A Radiative Model for the Study of the Feedback Mechanism between Photolytic Aerosols and Solar Radiation
… more complicated chemical mechanisms, wet and dry deposition phenomena, and interactions and feedback mechanisms between meteorology and atmospheric chemistry. The purpose of this study is to ascertain the sensitivity of the solar radiative field in the atmosphere to absorption and scattering …
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Investigation Of The Use And Application Of Passive Sampling Methods For Understanding Potential Sources Of Mercury To Western United States
… areas in the western United States. Atmospheric deposition of Hg has become an increasing concern as a major pathway for Hg entering ecosystems. Specifically, dry deposition is being recognized as an important way for Hg to enter ecosystems in the western U.S., however little work has been done …
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