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 59 for “"stratospheric ozone"”.
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Stratospheric ozone in the Earth system
Ozone in the stratosphere protects life on Earth by absorbing much of the ultraviolet solar radiation, as well as being a major source of ozone to the troposphere. A number of factors can influence stratospheric ozone levels and explain past, present and future changes. While there is a large …
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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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Understanding Drivers of Stratospheric Ozone Change and Fingerprinting its Recovery
Stratospheric ozone serves as Earth’s natural protective layer, shielding the surface from harmful ultraviolet radiation. The discovery of the Antarctic ozone “hole” in the late 1980s raised significant societal and scientific concern, prompting the rapid regulation of ozonedepleting substances …
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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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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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Theoretical and experimental studies of heterogeneous chemical processes leading to stratospheric ozone depletion
… responsible for 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 …
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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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Chemistry-climate modelling studies of decadal and interdecadal variability in stratospheric ozone and climate: The 11-year solar cycle and future ozone recovery
… to the 11-year solar cycle forcing and future stratospheric ozone recovery. Firstly, following recent improvements in the model, the atmospheric response to the solar cycle forcing simulated in UMUKCA is discussed. It is shown that while some features show a broad resemblance to …
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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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Studies of the Stratospheric Nitrogen and Iodine Chemistry by Balloon-Borne DOAS Measurements and Model Calculations
It is well known, that the stratospheric ozone depletion is controlled mainly by halogen and nitrogen compounds. As a result of the complex interaction between chemical and dynamical processes, a quantitative understanding of the ozone loss has not been achieved till now, although it was subject of …
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On potential effects from the aviation and refrigeration sectors on ozone and climate
… refrigeration sectors contribute to the global ozone budget and to climate change via emissions of relevant gases and particles, subsequently followed by a complex set of chemical and physical processes. For the refrigeration sector, iodotrifluoromethane (CF3I) and methyl iodide (CH3I) are two …
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Redefining “Space Sustainability” for Launch Vehicles: Forecasting the Atmospheric Impact of the Commercial Space Launch Industry in 2050
… the steady state impact of launch emissions on stratospheric ozone and surface air quality. We find that the black carbon emitted by kerosene and methane rockets causes an indirect increase in stratospheric ozone due to the removal of NOx, with ozone column change averaging 5.07 Dobson Units …
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Photosynthetic and oxidative stress in the green alga Dunaliella tertiolecta: The effects of UV-B and UV-A radiation
… biosphere has increased in response to decreased stratospheric ozone. As a consequence, significant attempts have been made to elucidate the effects of UV-B radiation on primary producers such as phytoplankton and plants. Considerably less effort has been devoted to describing the role played by …
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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)
… studied extensively 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 …
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Global heat balance without and with solar radiation management
… the concentration of CO2, CH4, N2O, tropospheric ozone, other greenhouse gases, and contrails in the atmosphere. Also, anthropogenic influences on short wavelength radiation including effects of land use changes on albedo, anthropogenic tropospheric aerosols and stratospheric ozone and black …
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Food Safe Alternatives to Methyl Bromide in Country Ham Production
… used to control mite populations, is damaging to stratospheric ozone and will no longer be available. Presently, no alternative control measure has been approved to combat the ham mite; therefore, it is essential to identify potential alternatives. Interest in safe alternatives to control …
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Variability of the polar stratospheric vortex and its impact on surface climate patterns
… various aspects of the variability of the stratospheric polar vortex and the effect of this variability on tropospheric weather and climate patterns on various timescales. In the first part of this work, an improved idealized model was developed to study the coupled stratosphere-troposphere …
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The effects of ultraviolet-B radiation on antioxidant status and survival in the zebrafish.
… least partly due to anthropogenic degradation of stratospheric ozone. The direct impact of present ambient (1.95 W/m$\sp2$) and sub-ambient doses of UV-B radiation on muscle and skin tissue antioxidants in mature zebrafish (Brachydanio rerio) and on their hatching success and survival in early …
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