I am interested in the Earth's , which is the flow of carbon (generally in the form of carbon dioxide) between the land, oceans and atmosphere. Measurements of the atmosphere are key to understanding these processes: they constrain the sources and sinks of carbon dioxide and help determine the impacts of increasing fossil fuel emissions into our atmosphere. My research focuses on making precise and accurate measurements of atmospheric greenhouse gases, such as carbon dioxide, methane, and nitrous oxide, and interpreting the measurements in the context of the carbon cycle.
My two main research projects investigate the impact of the Boreal forest on the global carbon cycle, and the magnitude of the greenhouse gas emissions from Toronto, Canada's largest city.
I am involved in two large projects: the Total Carbon Column Observing Network (TCCON), which is a global network of ground-based instruments that measure greenhouse and other atmospheric trace gases with unprecedented precision and accuracy, and the Orbiting Carbon Observatory (OCO-2), a satellite launched in July 2014, that is making high precision global measurements of atmospheric carbon dioxide and solar-induced fluorescence (a measure of plant photosynthesis).