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 “"chemistry-transport-model"”.
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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
… nitrogen 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 …
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Air quality impacts of crop residue burning in India and mitigation alternatives
… thesis applies adjoint of the GEOS-Chem regional chemistry-transport model in combination with epidemiological and economic models to inform rational decision-making. First, this thesis estimates the premature deaths as 43,000-73,000 valued at 10-23 billion USD in India attributable to exposure to …
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Application of the complex step method to chemistry-transport modeling
Sensitivity analysis in atmospheric chemistry-transport modeling is used to develop understanding of the mechanisms by which emissions affect atmospheric chemistry and composition, to quantify the marginal impact of emissions on air quality, and for other applications including improving estimates …
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Atmospheric Impacts of Hydrogen as an Aviation Fuel
… use the GEOS-Chem High Performance (GCHP) global chemistry-transport model to conduct a spatially discretized, multi-year impact assessment of the atmospheric impacts of hydrogen-fueled aviation. We implement a flux surface boundary condition for hydrogen to provide an improved representation of …
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Public health impacts of excess NOx̳ emissions from Volkswagen diesel passenger vehicles in Germany
… and combined with sales data and a vehicle fleet model to estimate total excess NOx̳ emissions. These emissions are distributed on a 25 by 28 km grid covering Europe, using the German Environmental Protection Agency's (UBA) estimate of the spatial distribution of NOx emissions from passenger cars …
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Adjoint sensitivity analysis of the atmospheric impacts of combustion emissions
… impact the environment through chemical and transport processes that span varying temporal and spatial scales. Numerical simulation of the effects of combustion emissions and potential corresponding mitigation approaches is computationally expensive. Atmospheric adjoint modeling enables the …
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Sensitivity of the ozone layer, climate, and public health to changes in the location of aviation emissions
… and the potential re-introduction of supersonic transport flying in the stratosphere present new scenarios that regulations do not currently address. To quantify the atmospheric impacts of aviation emissions, past studies have used global chemistry-transport models. However, these models are not …
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Long term trends of halogenated trace gases, hydrocarbons, alkyl nitrates and of the oxidative capacity of the atmosphere
… Tasmania. A two-dimensional global atmospheric chemistry transport model is used to derive global annual emission histories of these long lived gases. Emissions of the halons are found to have decreased since peaking in the 1990s. There is still some considerable uncertainty in the remaining …
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Retrieval of methane and carbon monoxide using near infrared spectra recorded by SCIAMACHY onboard ENVISAT : Algorithm Development and data analysis
… abundances show a very good agreement with modeled abundances from the chemistry-transport model TM3. The highest abundances were found over areas of rice cultivation in South-East Asia and can be considered a direct proof of large scale methane emissions in Asia. In the time-period from …
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Sensitivities of Atmospheric Composition to High-Altitude Vehicles Emissions
… the environmental implications of high-altitude transportation, with a focus on civil supersonic transport (SST) emissions. The potential atmospheric impacts of these emissions, including changes in atmospheric composition and air quality, are examined in detail. Previous studies have evaluated …
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Plume to global-scale atmospheric impacts of aviation emissions
… are driven by chemical, microphysical and transport processes that span different magnitudes of temporal and spatial scales, from near-field inplume chemistry that evolve over minutes and distances of ~100 m to global-scale phenomena taking place at the continental scale. To evaluate …
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Study on impacts of aviation emissions and related dynamics and chemistry
… increase in demand for commercial aviation transport raises questions about the effects of resulting emissions on the environment. The upper troposphere and lower stratosphere (UTLS), where most of aviation emissions occur, plays an important role in climate and atmospheric chemistry. The …
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Past, present, and future climate impacts of aviation
… forcing, we place a particular focus on modeling contrails. Using a mediumfidelity aircraft plume model and ERA5 reanalysis weather data, our results indicate that contrail 3 impacts increased by 460% from 1980 to 2019, outpacing growth in annual fuel consumption. Per flight distance, …
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Der Einfluss der Dynamik auf die stratosphärische Ozonvariabilität über der Arktis im Frühwinter
… Satellitenmessinstrumenten und Ozonsonden sowie Modellsimulationen des Lagrangschen Chemie/Transportmodells ATLAS verwandt. Die über die Fläche (45–75°N) und Zeit (August-November) gemittelte Vertikalkomponente des Eliassen-Palm-Flussvektors durch die 100hPa-Fläche zeigt eine Verbindung zwischen …