My research is fundamentally based on aqueous and isotope geochemistry. In general, I investigate carbon cycling (e.g., CO2) on both modern and geologic timescales, but my research spans a variety of landscapes and tools.
A major theme of my research is understanding silicate chemical weathering, a natural process with controls Earth’s atmospheric CO2 levels on long timescales, and ultimately regulates global temperatures. To this end, I have conducted studies on chemical weathering around the world. My research has addressed the growing debate on whether chemical weathering of volcanic terranes, such as Iceland, have a disproportionally large impact on Earth’s long-term atmospheric CO2 levels, as well as challenged the long-held assumption that silicate chemical weathering beneath ice sheets is minimal, and investigated the extent to which plant biogeochemical cycling alters the primary signatures of weathering in rivers.
Chemical weathering is also the backbone of my research into Enhanced Weathering (EW), a carbon dioxide removal strategy for combating climate change. As part of the Leverhulme Centre for Climate Change Mitigation (LC3M), we are implementing the first large-scale field tests of EW, which seeks to optimize the natural controls on chemical weathering such that large quantities of CO2 are sequestered on human, rather than geologic, timescales. Current field trials are underway in the American Midwest, Malaysia Borneo, and the United Kingdom.
Finally, my research extends to the development of new analytical techniques. I am broadly interested in understanding the fractionation of non-traditional stable isotopes (e.g., Sr, Ca, Mg) and the application of these isotope systems to answering Earth surface process questions.
Last Updated: 01/05/2019