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 73 for “"Atmospheric Deposition"”.
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Atmospheric Deposition Monitoring to Assess Trends in Atmospheric Species
*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Microsoft Office.
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Atmospheric deposition of trace metals to urban and coastal environments
The atmospheric flux (wet and dry) of trace metals (Ni, Co. Cu, Pb, Cd, Al and Na) to the Irish Sea and the North-West of England is presented. The fluxes were calculated from determined trace metal concentrations of aerosols (Al, Fe, Mn, Cd, Co, Cr, Cu, Na, Ni, Pb, V and Zn) and rainwaters (Ni, …
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A decisionmaking framework for assessing atmospheric deposition impacts on regional forest inventory
… decisionmaking framework was developed to assess atmospheric deposition impacts on regional softwood inventory in Virginia. This decision making framework consists of three segments: a forest inventory projection model, a timber production function, and a timber consumption model. The Timber …
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The Temporal and Spatial Distribution of Hydrocarbons in Atmospheric Deposition From Stations Surrounding Lower Chesapeake Bay
… 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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Spatial Patterns of Mercury in Atmospheric Deposition, Soils and Lake Biota in the Adirondack Park, New York
… to both humans and wildlife due to its toxicity. Atmospheric deposition is the main source of Hg to most remote environments. The Adirondack Park in New York State of the United States receives moderate Hg deposition, and is a region characterized by relatively high concentrations of Hg in the …
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Atmospheric deposition of combined nitrogen in the Cape Metropolitan Area: a threat to a species rich ecosystem?
… approaches were used in order to gauge levels of atmospheric N deposition to the natural vegetation of the Cape Metropolitan Area (CMA). In the first approach, bulk collectors were constructed and set up at five sites around the CMA in order to trap atmospheric deposition for chemical analysis. In …
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Nutritional contribution of atmospheric deposition to the Strandveld vegetation of West Coast South Africa Justine Muhoro Nyaga.
… may be acquired are weathering of rock and atmospheric deposition. Symbiotic and free-living diazotrophic bacteria and blue green algae also contribute N. In ecosystems with limited occurrence of N₂-fixation and occurring on low-nutrient bedrock, atmospheric deposition is the most …
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Development of soil lead and tree-ring methods for characterizing atmospheric deposition gradients and subsequent tree growth responses
Atmospheric deposition of pollutants and nutrients can have a range of effects on aquatic and terrestrial ecosystems. Despite its ecological importance, it remains a challenge to model patterns of deposition across complex terrain and also to assess how forest ecosystems are reacting to chronic …
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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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Ice-core records of the chemical quality of atmospheric deposition and climate from mid-latitude glaciers, Wind River Range, Wyoming
Includes bibliographical references (pages 166-174).
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Fate of natural and anthropogenic particles in peat bogs
Investigating atmospheric deposition over a scale of millennial period is crucial because humans are emitting more and more synthetic and natural compounds (i.e.: pollutants and/or dust) to the environment through the atmosphere. It is therefore necessary to determine the background deposition rate …
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Atmospheric microplastic pollution
… the beginning of the new field of research on theatmospheric transport of microplastic and its potential terrestrial and oceanicsource. Taking atmospheric deposition samples from the French Pyrenees Iwas able to illustrate the first atmospheric transport of microplastics of at least95km using …
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Understanding ocean iron dynamics and impacts on marine ecosystems
… ocean carbon balance and biogeochemical cycles. Atmospheric deposition of dissolved Fe (dFe) to the ocean has increased over the last decades partly due to human activities, which can significantly alter marine ecosystems. Thus, a comprehensive understanding of how the ocean Fe cycling operates …
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Simulation of Runoff and Pollutant Loss in Urbanizing Watersheds
… In addition, components were added to simulate atmospheric deposition and urban management practices, including wet ponds, dry ponds, and infiltration trenches. The modified model was evaluated on two watersheds in Blacksburg, Virginia, including a subwatershed of Stroubles Creek and a large …
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Acid deposition in the Eastern Transvaal Highveld
… emphasis has been placed on the severity of atmospheric deposition despite the fact that acid deposition is a major world-wide environmental concern. This study focusses on the chemistry and severity of atmospheric depositions to the south and south-east of the Witbank-Middleburg Power and …
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Application of the peat archive as tool in environmental chemistry
Ombrotrophic peat bogs are natural archives of atmospheric deposition of pollutants. Therefore, peat profiles can be used to study the chronology of environmental contamination with harmful pollutants such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and per- and …
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The Association between Mercury Emissions and Individuals with Autism Aged from 3-21 in the State of California from 2001 to 2007
<p>The paper explores how historical mercury deposition associates with the incidents of autism, identified in individuals aged from 3 to 21 in California from 2001 to 2007. The association between mercury deposits and the prevalence of individuals with autism aged from 3 to 21 in California was …
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Modeling the Effects of Acid Deposition and Natural Organic Acids on Surface Waters
<p>Atmospheric deposition of sulfuric and nitric acids has impacted surface waters in the eastern U.S. Controls on anthropogenic S and NOx emissions have resulted in a substantial decrease in acid deposition. Long-term measurements of surface water chemistry indicate contrasting responses of …
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Investigations on the Phenomena of Accumulation and Mobilization of Heavy Metals and Arsenic at the Sediment-Water Interface by Electrochemically Initiated Processes
… in anthropogenic input of contaminants via atmospheric deposition, catchment runoff, effluent inflow and dumping from industrial transportation, mining, agricultural and waste disposal sources [EPA, 1989]. The transfer of contaminants associated with settling inorganic particulates and/or …
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