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
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
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
Cause and effect: new mechanisms of particles formation in thunderstorms. This project aims to identify meaningful and specific indicators for predicting particle formation and alteration during thunderstorms. How thunderstorms develop is well-understood. However, identifying meaningful and specific indicators for predicting particle alteration during a thunderstorm is still not clear. This project will practically contribute to the evidence of the impact of air particulates, thereby having dire ....Cause and effect: new mechanisms of particles formation in thunderstorms. This project aims to identify meaningful and specific indicators for predicting particle formation and alteration during thunderstorms. How thunderstorms develop is well-understood. However, identifying meaningful and specific indicators for predicting particle alteration during a thunderstorm is still not clear. This project will practically contribute to the evidence of the impact of air particulates, thereby having direct implications for meteorological, and air pollution policy in Australia and worldwide. This project will allow researchers to understand the impact of these factors on the escalation of the causative effects, and to find a way to prevent unnecessary fatal outcomes.Read moreRead less
Discovery Early Career Researcher Award - Grant ID: DE180101194
Funder
Australian Research Council
Funding Amount
$353,700.00
Summary
A chirped pulse microwave spectrometer for studying atmospheric chemistry. This project aims to construct a microwave spectrometer with a unique molecular source to study atmospheric chemistry. Criegee intermediates formed by the ozonolysis of terpenes are key species in atmospheric chemical processes. Only very recently have small Criegee intermediates been detected by various spectroscopic methods. In this project a purpose-built chirped, pulsed Fourier transform microwave spectrometer will be ....A chirped pulse microwave spectrometer for studying atmospheric chemistry. This project aims to construct a microwave spectrometer with a unique molecular source to study atmospheric chemistry. Criegee intermediates formed by the ozonolysis of terpenes are key species in atmospheric chemical processes. Only very recently have small Criegee intermediates been detected by various spectroscopic methods. In this project a purpose-built chirped, pulsed Fourier transform microwave spectrometer will be coupled with a specialised molecular source that will enable their direct observation and characterisation by rotational spectroscopy. This will allow the structure of these molecules to be determined, which will provide insights into their reaction mechanisms.Read moreRead less
Precipitation in shallow convection over the Southern Ocean. This project aims to quantify the amount of precipitation over the Southern Ocean and identify the key dynamical and microphysical processes that lead to its development. Large uncertainties exist in the frequency and intensity of precipitation, which limits the ability to model the coupled Southern Ocean climate system. Observations from the RV Investigator, an Australian marine research vessel, have revealed heavy precipitation event ....Precipitation in shallow convection over the Southern Ocean. This project aims to quantify the amount of precipitation over the Southern Ocean and identify the key dynamical and microphysical processes that lead to its development. Large uncertainties exist in the frequency and intensity of precipitation, which limits the ability to model the coupled Southern Ocean climate system. Observations from the RV Investigator, an Australian marine research vessel, have revealed heavy precipitation events within the shallow convection commonly found between fronts that have not been captured by either satellite observations or numerical models. This project will improve weather forecasts, including precipitation, and climate projections over the Southern Ocean and the adjoining Antarctic and the southern part of Australia.Read moreRead less
Discovery Early Career Researcher Award - Grant ID: DE120102645
Funder
Australian Research Council
Funding Amount
$375,000.00
Summary
The cause of the poleward shift of Earth's storm tracks and jet streams. Why do global climate models shift the atmospheric storm tracks and jet streams poleward in simulations of future climate? This project will determine the underlying causes of the most important circulation change that is projected to occur with increasing greenhouse gases, and will allow much more accurate regional climate projections.
The dynamics of subtropical anticyclones and the connection to drought, heatwaves and bushfires in southern Australia. The aim of the project is to understand the dynamics of anticyclones (high pressure systems) in the region of southern Australia. The study of anticyclones in the region is important because of their very strong connection to rainfall in the winter, and heatwaves and bushfires in the summer, and because so little work has been done on understanding what is the defining feature o ....The dynamics of subtropical anticyclones and the connection to drought, heatwaves and bushfires in southern Australia. The aim of the project is to understand the dynamics of anticyclones (high pressure systems) in the region of southern Australia. The study of anticyclones in the region is important because of their very strong connection to rainfall in the winter, and heatwaves and bushfires in the summer, and because so little work has been done on understanding what is the defining feature of the climate of southern Australia. Understanding what controls the location and strength of these features will go a long way to explaining how the climate of southern Australia will change in a warmer world.Read moreRead less
Local climate changes caused by large bushfire burnt areas. This project aims to quantify the impact on local climate produced by large burnt areas after extreme bushfires. This project expects to generate new knowledge on these previously unexplored fire-scar induced changes to local climate. It will extend an innovative approach that combines satellite based earth observation with very high resolution regional climate modelling to quantify the impacts on land-atmosphere feedbacks and local cli ....Local climate changes caused by large bushfire burnt areas. This project aims to quantify the impact on local climate produced by large burnt areas after extreme bushfires. This project expects to generate new knowledge on these previously unexplored fire-scar induced changes to local climate. It will extend an innovative approach that combines satellite based earth observation with very high resolution regional climate modelling to quantify the impacts on land-atmosphere feedbacks and local climate. Expected outcomes of this project include enhanced methods to quantify local climate changes after extreme fires and their effect on vegetation recovery. This should provide significant benefits to the planning for, and management of, vegetation recovery after extreme fires.Read moreRead less