Atmospheric Photothermal Oxidation as a New Reaction in the Atmosphere. Atmospheric models provide crucial advice on the current and future impacts of human activity on the atmosphere. This project hypothesizes the presence of a new class of chemical reactions that are unknown in atmospheric science and therefore missing from the best existing models. The reactions require both sunlight and air, and they behave differently to all other types of atmospheric reactions. This project aims to charact ....Atmospheric Photothermal Oxidation as a New Reaction in the Atmosphere. Atmospheric models provide crucial advice on the current and future impacts of human activity on the atmosphere. This project hypothesizes the presence of a new class of chemical reactions that are unknown in atmospheric science and therefore missing from the best existing models. The reactions require both sunlight and air, and they behave differently to all other types of atmospheric reactions. This project aims to characterise these reactions in the lab, understand them with theory, and quantify their global impact through modelling. Expected benefits include new understanding of atmospheric chemistry, more accurate model predictions, and—as a result—better strategies for managing the impacts of human activity on the environment.Read moreRead less
Reactivity and photochemistry of halide anions: atmospheric implications. Bromine and iodine are suspected to be responsible for most of the halogen-induced ozone loss in the stratosphere but are not currently included in atmospheric models due to a paucity of knowledge of the gas-phase chemistry and photochemistry of their anions and radicals. This project will develop and deploy advanced mass spectrometry and laser spectroscopy techniques to enable precision measurements of the reactions and p ....Reactivity and photochemistry of halide anions: atmospheric implications. Bromine and iodine are suspected to be responsible for most of the halogen-induced ozone loss in the stratosphere but are not currently included in atmospheric models due to a paucity of knowledge of the gas-phase chemistry and photochemistry of their anions and radicals. This project will develop and deploy advanced mass spectrometry and laser spectroscopy techniques to enable precision measurements of the reactions and photo-reactions of gas-phase iodide and bromide anions and their oxides. These state-of-the-art measurements of reaction kinetics and products will enable accurate chemical models that predict the impact of bromine and iodine chemistry on ozone levels and will inform future models for global climate.Read moreRead less
Discovery Early Career Researcher Award - Grant ID: DE200100549
Funder
Australian Research Council
Funding Amount
$384,616.00
Summary
The true impact of fluorinated compounds in the atmosphere. This project aims to improve the underpinning science that is incorporated into atmospheric chemistry models so humanity can better understand, predict and respond to the impact of emitting large volumes of fluorinated compounds. This project expects to challenge assumptions currently used to model the atmospheric chemistry of organic fluorine compounds, as well as to evaluate the environmental impact of replacements. Expected outcomes ....The true impact of fluorinated compounds in the atmosphere. This project aims to improve the underpinning science that is incorporated into atmospheric chemistry models so humanity can better understand, predict and respond to the impact of emitting large volumes of fluorinated compounds. This project expects to challenge assumptions currently used to model the atmospheric chemistry of organic fluorine compounds, as well as to evaluate the environmental impact of replacements. Expected outcomes include a general model of organic fluorine photochemistry and refined atmospheric chemistry models. This should provide significant benefits in that humanity can avoid an environmental disaster and new, environmentally benign products can be developed.Read moreRead less
The forgotten role of the ground state in atmospheric photochemistry. This project aims to provide novel solutions to two deficiencies in current atmospheric chemistry models. That is, molecular hydrogen (H2) is underestimated by up to a factor of two, and in polluted areas, HO2 concentrations are underestimated by up to a factor of ten. The project will investigate these solutions and assess their local and global atmospheric impact. By better characterising the atmospheric H2 budget, and the r ....The forgotten role of the ground state in atmospheric photochemistry. This project aims to provide novel solutions to two deficiencies in current atmospheric chemistry models. That is, molecular hydrogen (H2) is underestimated by up to a factor of two, and in polluted areas, HO2 concentrations are underestimated by up to a factor of ten. The project will investigate these solutions and assess their local and global atmospheric impact. By better characterising the atmospheric H2 budget, and the role of ground state reactions in general, the predictive ability of atmospheric models will be improved. This will allow, for example, the outcomes of any change in atmospheric H2 concentration, potentially as part of any future hydrogen economy, to be predicted before they occur. The benefits of this project are global: they allow us to better predict the impact of changes to atmospheric composition – before they occur, and local: Australia’s strengths in physical, theoretical and atmospheric chemistry are reinforced.Read moreRead less
The long-term impact of short-lived, fluorinated pollutants. In 1987, the Montreal Protocol has regulated the manufacture and use of compounds that deplete the ozone layer. Industry has innovated to produce new compounds that do not affect ozone levels, for use in refrigeration and other applications for modern society. We have discovered that the current generation of compounds called hydrofluoroolefins decompose in the atmosphere to produce the worst global warming gas known. We hypothesise th ....The long-term impact of short-lived, fluorinated pollutants. In 1987, the Montreal Protocol has regulated the manufacture and use of compounds that deplete the ozone layer. Industry has innovated to produce new compounds that do not affect ozone levels, for use in refrigeration and other applications for modern society. We have discovered that the current generation of compounds called hydrofluoroolefins decompose in the atmosphere to produce the worst global warming gas known. We hypothesise that other HFOs will also decay into global warming compounds. In this project we will determine the atmospheric consequences of modern refrigerants. Expected benefits include determination the best and worst compounds for environmental impact, and data to guide industry and legislators.Read moreRead less
Reactive Intermediates in Atmospheric and Combustion Chemistry. Reactive intermediates are the key species that determine outcomes of the chemical reaction networks in atmospheric and combustion chemistry. However, most reactive intermediates remain undiscovered. The project aims to discover these intermediates using laser spectroscopy. Current models of atmospheric chemistry cannot account for the carbon balance over forests, nor the formation of secondary organic aerosols. Combustion models st ....Reactive Intermediates in Atmospheric and Combustion Chemistry. Reactive intermediates are the key species that determine outcomes of the chemical reaction networks in atmospheric and combustion chemistry. However, most reactive intermediates remain undiscovered. The project aims to discover these intermediates using laser spectroscopy. Current models of atmospheric chemistry cannot account for the carbon balance over forests, nor the formation of secondary organic aerosols. Combustion models struggle to predict how next-generation fuels burn in modern engines. The successful discovery of these intermediates would allow models to be more accurate and predictive. This will allow scientists, engineers and policy makers to make more informed decisions about atmospheric processes and design more efficient new fuels.Read moreRead less
Formation, photochemistry and fate of gas-phase peroxyl radicals. This project aims to understand how peroxyl radical reactions modulate the composition of air. The gas-phase chemical reactions of organic peroxyl radicals contribute to air quality in clean and polluted environments. However, experimental observations of these reaction intermediates and the complex mechanisms governing their formation and fate are limited. This project will use mass spectrometry and laser-based methods to interro ....Formation, photochemistry and fate of gas-phase peroxyl radicals. This project aims to understand how peroxyl radical reactions modulate the composition of air. The gas-phase chemical reactions of organic peroxyl radicals contribute to air quality in clean and polluted environments. However, experimental observations of these reaction intermediates and the complex mechanisms governing their formation and fate are limited. This project will use mass spectrometry and laser-based methods to interrogate the chemical and photochemical reactions of peroxyl radicals in the gas phase. This project expects to understand the composition and dynamics of the troposphere and inform strategies to improve air quality.Read moreRead less