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 69 for “"ozone depletion"”.
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Physical chemistry of acid systems relevant to stratospheric ozone depletion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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The importance of aluminum oxide aerosols to stratospheric ozone depletion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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The Downward Influence of Ozone Depletion in the Arctic Lower Stratosphere
Severe ozone depletion in the polar lower stratosphere has been linked to significant changes in tropospheric circulation patterns in the both hemispheres. Observed Southern Hemisphere circulation changes are easily reproduced in climate models and may be achieved by either increasing ozone …
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Heterogeneous reactions on sulfuric acid films with implications for ozone depletion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Laboratory investigations of heterogeneous chemistry important to ozone depletion in the stratosphere
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Theoretical and experimental studies of heterogeneous chemical processes leading to stratospheric ozone depletion
… the annual destruction of polar stratospheric ozone. Using molecular-orbital and density-functional-based computational methods that are extensively validated, partial dissociation of HCl is shown to be kinetically rapid and thermodynamically favorable on an extended ice Ih surface model with …
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Experimental kinetics studies of gas phase halogen reactions involved in stratospheric ozone depletion
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.
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Studies of Arctic Tropospheric Ozone Depletion Events Through Buoy-Borne Observations and Laboratory Studies
… destruction of ground-level Arctic ozone in the Arctic occurs at the onset of spring, in concert with polar sunrise. Solar radiation is believed to stimulate a series of reactions that cause the production and release of molecular halogens from frozen, salty surfaces, though this …
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Stratospheric ozone depletion and plant-insect interactions: Effects of UVB radiation of generalist and specialist herbivores on a tropical tree and a temperate forb
I investigated effects of UVB radiation on plant-insect interactions using two plant-herbivore systems.
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Ozone Chemistry in the Lower Stratosphere: Drivers, Trends, and Impacts
… volcanic eruptions on anthropogenically driven ozone depletion and recovery trends is explored. Results confirm previous work showing that large volcanic eruptions increased the rate of ozone depletion prior to the mid-1990s, and for the first time quantify how the combination of an unusually …
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Stratospheric ozone and Southern Hemisphere climate change : impacts and robustness in CMIP5 models
Stratospheric ozone depletion is thought to be the dominant cause of recent observed southern hemisphere (SH) circulation changes during austral summer, along with the consequential impacts on tropospheric climate conditions. Links between ozone depletion and the positive phase of the dominant mode …
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Attribution of stratospheric ozone change and associated climate impacts
Recognition of stratospheric ozone depletion as a significant global danger sparked the landmark international agreement of the Montreal Protocol to control the production of ozone depleting substances (ODSs). There are now signs of stratospheric ozone recovery, and it is essential to understand …
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Variability of the polar stratospheric vortex and its impact on surface climate patterns
… part of the thesis, the impact of stratospheric ozone depletion on the Antarctic polar vortex and its subsequent influences on southern hemisphere surface climate patterns is investigated. It is verified that stratospheric final warming events have an impact on tropospheric circulation in a …
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Studies of Stratospheric and Tropospheric Ozone, NO2, and BrO Using UV-Visible Spectroscopy in the Arctic and at Mid-latitudes
… measurements at PEARL, was used to validate ozone and NO2 measurements from the Atmospheric Chemistry Experiment (ACE) and Optical Spectrograph and InfraRed Imaging System (OSIRIS) satellite instruments. Ozone from all instruments agrees to within 12.0%, while NO2 measurements agree to within …
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Analysis and optimization of a dual-load vapor compression cycle using non-azeotropic refrigerant mixtures
… replacements for R12 because of their low ozone depletion potential, low global warming potential and promising thermodynamic characteristics which could improve cycle efficiency. A NARM experiences a variable temperature glide during a constant-pressure phase change process, making it a …
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Understanding the spatial distribution of the Southern Hemisphere near-surface westerlies and Its trends
… jet latitude are also examined. Stratospheric ozone depletion has been implicated in surface circulation changes in the SH high latitudes; one of these changes has been a poleward shift of the jet in austral summer. In this thesis, it is found that a poleward shift of the December-February …
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Studies of Atmospheric Ozone and Related Constituents in the Arctic and at Mid-latitudes
… One goal of this work was to study surface ozone depletion events (ODEs) in the Arctic, using data from the GBSs. The measurements of ozone and BrO, combined with model results, indicate that both high wind/blowing snow and low wind/stable boundary layer are favorable environmental …
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The Measurement of Atmospheric Species with Absorptions Close to the Actinic Flux Cut-Off by Active & MAX-DOAS: Chlorine Monoxide (CIO) & Sulphur Dioxide (SO2)
… for its role in catalytic stratospheric ozone depletion following the discovery of the Antarctic ozone hole in 1985. Reactive chlorine chemistry is known to occur in the troposphere as well, originating primarily from sea salt aerosols in the marine boundary layer, but direct …
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Development of waste management systems: applications of Durham Region
… impacts with the least in global warming, ozone depletion, and acidification potential with 3.92E-05 kgCO2 eq, 5.57E-12 kgCFC-11 eq and 2.19E-07 kgSO2 eq.
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Diatoms in Antarctic ice cores, a novel proxy for reconstructing past wind variability in the Pacific sector of the Southern Hemisphere Westerly Wind belt
… greenhouse gas (GHG) concentrations and ozone depletion. However, the lack of long-term wind records in the Southern Hemisphere mid-latitudes hinders our ability to assess the wider context of the recently observed changes. This lack of a clear consistent timing limits our understanding …
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