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.
Results
Showing 1 to 20 of 39 for “"Atmospheric Transport"”.
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Examining the Atmospheric Transport of Microplastics using the HYSPLIT Model
… model was utilized to identify differences in transport distance and deposition area by particle size and shape. The extent of microplastic transport and deposition varied significantly by shape for particles larger than 6 µm. Long fibres deposited over a 32% greater area than spherical …
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Volatile metal degassing from volcanoes: source processes, atmospheric transport and deposition
… In Chapter 5 I trace the downwind evolution of atmospheric concentrations of metal and metalloid elements during the 2018 eruption. Specifically, I demonstrate that volatile metal pollutants were rapidly depleted from the atmosphere – up to 100 times faster than refractory species. High rainfall …
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Quantifying Terrestrial and Aquatic Ecosystem Methane Emissions with Process-based Biogeochemistry and Atmospheric Transport and Chemistry Models
To improve the quantification of methane emissions from Arctic wetlands and lakes, an integrated modeling framework was developed. It includes a newly developed process-based lake biogeochemical model and a widely used 4-D VAR inversion algorithm implemented with the nested grid high-resolution …
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Sensitivity of tropospheric chemistry to the source of NO x from lightning : sensitivity simulations with the global 3D chemistry model for atmospheric transport and chemistry MATCH-MPIC
… oxides is studied using the global chemistry transport model MATCH-MPIC. The responses of NOx, O3, OH, HNO3 and peroxyacetyl-nitrate (PAN) are investigated. A marked sensitivity to both parameters is found. NOx burdens globally can be enhanced up to 100% depending on the vertical placement and …
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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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Low Reynolds Number Settling of Cylindrical Rods with Various Geometries in a Quiescent Fluid
This dissertation is motivated by the atmospheric transport of microplastic fibres, a growing environmental concern. The atmosphere is recognized as a major pathway for the long-range transport of microfibres. However, many atmospheric simulations simplify fibre geometry, often representing them as …
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Cosmogenic 14 CO as tracer for atmospheric chemistry and transport
Advances in atmospheric chemistry research depend increasingly on the use of threedimensional (3-D) atmospheric transport and chemistry models. In this thesis the application of atmospheric 14CO measurements for evaluation of such models is systematically developed. Emphasis is on the simulated …
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The Isotopic Composition of Water Vapor in the Upper Troposphere/Lower Stratosphere Region : Modeling, Analysis and Sampling
… important information for the understanding of atmospheric transport and photochemistry. The presented thesis describes with the help of models the processes governing the isotopic composition of atmospheric water vapor. The stable isotopologues - $HDO$, $H_2^{17}O$ and $H_2^{18}O$ - and the …
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Atmospheric Lagrangian transport structures and their applications to aerobiology
Exploring the concepts of long range aerial transport of microorganisms is the main motivation of this study. For this purpose we use theories and concepts of dynamical systems in the context of geophysical fluid systems. We apply powerful notions such as finite-time Lyapunov exponent (FTLE) and …
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An Improved Model of Nuclear Debris Analysis Systems in Atmospheric Collection Aircraft
… nuclear event simulation software DELFIC and the atmospheric transport and dispersion code HYSPLIT, this model's functionality includes every aspect of a sample collection mission, from the movement of the aircraft through the nuclear cloud to explicit radiation transport and detection from cloud …
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A comprehensive global 3D model of delta-18O in atmospheric CO2
… global 3D model to simulate delta-18O in atmospheric CO2. The aim is to disentangle this isotope signal which offers the potential to determine the CO2 gross fluxes of the terrestrial biosphere. Model surface processes have been validated against regional experiments while the integrated …
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Tracing the global carbon cycle with bomb radiocarbon
… wanted also to determine new constraints on the atmospheric carbon budget buried in the long-term observations of atmospheric 14CO2. Three relevant findings came out at the different stages of my research. First, the man-made passive tracer SF6 was shown to be a powerful tool for investigating …
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A nitrogen budget for the Cape Metropolitan area : is nitrogen enrichment occurring in the soils of remnant patches of lowland fynbos?
… have the potential to deposit 33 kg N ha⁻¹ yr⁻¹. Atmospheric N deposited on unimpacted coastal fynbos is 1.99 kg ha⁻¹ yr⁻¹. Thus remnant patches of lowland fynbos are threatened by replacement by grasslands as a result of atmospheric N inputs. Direct measurements of soil N pools are required, …
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Laser-based method for black carbon determination in lake sediment cores and black carbon deposition in Greenland since 300 CE
… surfaces, such as snow and ice, and during atmospheric transport. Historical records of BC, such as those measured in ice cores, can be used to reconstruct forest fire history over past millennia. Thus, quantifying BC's role in the climate system is important for understanding both fire …
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150 Years of Light Absorbing Impurity Deposition on South Cascade Glacier, Washington State USA
… and biofuels. These particles are subject to atmospheric transport and are deposited on snow by wind and precipitation events. When BC is deposited, it lowers the albedo of the glacial surface resulting in increased energy absorption and melt. We used a 158 m long ice core collected from the …
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Vertical Concentration Gradient of Influenza Viruses Resuspended from Floor Dust
… swinging hand. We used these coefficients in an atmospheric transport model to predict virus concentrations as a function of the carrier particle size and height in the room. Results indicate that the concentration of resuspended viruses at 1 m above the floor is about seven times the …
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Flight Vehicle Control and Aerobiological Sampling Applications
… using UAVs helps to better understand the atmospheric transport of microorganisms. Autopilot-equipped UAVs can accurately sample along pre-defined flight plans and precisely regulated altitudes. They can provide even greater utility when they are networked together in coordinated sampling …
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Movement and Structure of Atmospheric Populations of Fusarium
… Many species of Fusarium are well-suited for atmospheric dispersal, yet little is known about their aerobiology. Previous research has shown that large-scale features known as atmospheric transport barriers (Lagrangian coherent structures) guide the transport and mixing of atmospheric …
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