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 11 of 11 for “"Ozone Depleting Substances"”.
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An Investigation of the Distribution of Ozone-depleting Substances in the Upper Troposphere and Lower Stratosphere
… component in simulating the recovery of the ozone layer as well as changes in the climate system. The Brewer-Dobson Circulation is not well constrained by observations and further investigation is required to resolve uncertainties related to the mechanisms driving the circulation. This work …
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Impact of two potential policy options on atmospheric chemistry and climate: hydrogen economy and low-GWP alternatives to ozone depleting substances
… of the environment, e.g., attenuation of the ozone layer due to emissions of ozone-depleting substances, climate change due to greenhouse gas emissions, and air pollution due to fossil fuel combustion. This research analyzes the impacts of two potential future policy options, (1) hydrogen …
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Globalization and standards : the liberalization of trade and the potential for a regulatory race to the top
… of a race to the top: the Montreal Protocol on Ozone Depleting Substances, dolphin-safe tuna, and fair trade coffee. Many of the concerns of a race to the bottom pertain to process and production methods (PPMs) in global supply chains. One of the themes in this research is the distinction …
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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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Investigating Tropospheric Hydrogen Peroxide Trends from 1950-2014
… troposphere, is determined by oxidants including ozone (O₃), HOx radicals (OH and HO₂) and hydrogen peroxide (H₂O₂). O₃ is the primary source for HOx radicals, while H₂O₂ is a key sink for HOx radicals that terminates the rapid cycling between OH and HO₂. The concentrations of the HOx radicals and …
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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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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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Transport and Distribution of the Short-Lived Halocarbons in the Tropical Tropopause Layer in the Pacific Ocean: the Role of Convection
… distribution of short-lived halogenated organic substances in the tropical tropopause layer (TTL) in the Pacific Ocean. Short-lived halocarbons are one of the major groups of the ozone depleting substances as they provide a source for the active halogens which decrease ozone in the atmosphere. …
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Long term trends of halogenated trace gases, hydrocarbons, alkyl nitrates and of the oxidative capacity of the atmosphere
Atmospheric trends of a series of ozone depleting substances (halons) and greenhouse gases (PFCs, SF5CF3, HFC-227ea) are reported using measurements from Cape Grim, Tasmania. A two-dimensional global atmospheric chemistry transport model is used to derive global annual emission histories of these …
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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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Trend Analyses of the Abundances of Atmospheric Molecules
… Laboratory (PNNL) database.</p> <p>Near global ozone isotopologue distributions have been determined from infrared solar occultation measurements of the Atmospheric Chemistry Experiment (ACE) satellite mission. ACE measurements are made with a high resolution Fourier transform spectrometer …