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 14 of 14 for “"Atmospheric measurements"”.
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A Novel Mass Spectrometer for Atmospheric Measurements & Halocarbons During the CARIBIC and SAMBBA Aircraft Campaigns
… and prediction of stratospheric ozone depletion. Measurements of these and other compounds have created a demand for techniques that improve the number of atmospheric compounds analysable. A prototype time-of-flight gas chromatography-mass spectrometer (GCMS) was characterised for atmospheric …
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Investigation of the evolution of atmospheric particles with integration of the stochastic particle-resolved model PartMC-MOSAIC and atmospheric measurements
Atmospheric aerosols are known to have strong impacts on human health, visibility and the climate system. They originate directly from either anthropogenic or natural emission, or can be also formed through gas- particle conversion processes. Aerosol particles in the atmosphere often represent a …
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A Fiber-Based Lidar System for Atmospheric Water Vapor Measurement
… the potential to provide autonomous water vapor measurements with high resolution and accuracy. In addition, relatively low-cost mass-production and operation of the system is feasible. This dissertation first describes the design decisions and trade-offs made in the initial design of the …
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Volatile organic compounds in the New England troposphere: Atmospheric chemistry and measurement techniques
<p>Atmospheric measurements made at Appledore Island, Maine were used to investigate nighttime nitrate radical (NO3) chemistry and its significance for the nitrogen oxides (NOx = NO + NO2) budget in the Gulf of Maine region during the summer of 2004 International Consortium for Atmospheric Research …
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The application of quantum cascade lasers to mid-infrared gas sensing
… then applied to high temperature spectroscopic measurements. Spectra recorded at Rutherford Appleton Laboratory were used to calibrate high temperature measurements. The performance of the technology was thoroughly tested at the National Physical Laboratory. The resulting sensors have since been …
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Adjusting for Autocorrelated Errors in Neural Networks for Time Series
… currency exchange rates, speech signals, and atmospheric measurements can all be seen as examples of time series. Modeling time series across different domains is difficult. In many cases, it requires enormous effort and a significant amount of prior knowledge to generate highly accurate …
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Quantifying Methane Emissions from the Greater Toronto Area
… high spatial resolution that can be evaluated by atmospheric measurements. I describe the development of a network of portable Fourier Transform Spectrometers (FTS) in the GTA that measure total columns of CO2, CH4 and CO in the atmosphere and use the tracer-tracer ratio method to estimate CH4 …
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An Investigation of Local and Regionally Significant Non-Agricultural Sources of Ammonia in Toronto and the Great Lakes Region
Atmospheric ammonia is a significant environmental pollutant that contributes both to human mortality and morbidity and can also negatively influence ecosystem health. While the globally dominant source of ammonia pollution is agriculture, other sources may be influential on local and regional …
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Insight into the carbon cycle from continuous measurements of oxygen and carbon dioxide at Weybourne Atmospheric Observatory, UK
Atmospheric measurements of carbon dioxide (CO2) and oxygen (O2) are a valuable tool to better understand the global carbon cycle. Technological improvements have resulted in near-real-time continuous measurements of both O2 and CO2 becoming viable. The increased time resolution of continuous …
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Emission of biogenic halocarbons in temperate and tropical coastal zones
… have temporal and spatial variability in their atmospheric distributions. Marine regions, in particular coastlines, have been identified as important source regions for these compounds, and within these regions macroalgae (seaweeds) are an important source. Despite their short lifetime, it is …
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Machine Learning for Improvement of Ocean Data Resolution for Weather Forecasting and Climatological Research
… thus needing robust in-situ ocean data plus atmospheric profiles to enable precise hurricane tracking and intensity forecasts. Examining satellite datasets reveals radio occultation (RO) provides the most accurate 5-25 km altitude atmospheric measurements. However, below 5 km accuracy remains …
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Measuring Methane Emissions in the Urban Environment
… on a source-by-source basis. Measuring CH4 atmospheric concentrations enables direct estimation of emissions rates, and allows for the direct monitoring of the efficacy of emissions mitigation interventions. Within the GreaterToronto Area (GTA), high resolution CH4 inventories predict that …
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Atmospheric volatile organic compound measurements: Distributions and effects on air quality in coastal marine, rural and remote continental environments
… employed for whole air sampling and analysis of atmospheric volatile organic compounds is presented. The system described in this thesis produced high precision measurements for a large suite of nonmethane hydrocarbons, halocarbons, and alkyl nitrates, from part per billion by volume (ppbv) to …
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Quantifying emissions of greenhouse gases from South Asia through a targeted measurement campaign
… approaches at the national scale requires measurements that specifically target the region of interest. Primarily due to the lack of atmospheric measurements from the region, emissions estimates of these greenhouse gases from India have largely been missing. New in situ measurements of …