The interaction between water and rock near Earth’s surface drives a suite of dissolution/precipitation, acid/base, and reduction/oxidation reactions collectively called chemical weathering. These reactions are a major source of dissolved elements to natural waters and account for large transfers of carbon, oxygen, phosphorus, and sulfur between the rock reservoir and the ocean/atmosphere system. Linkages between chemical weathering processes and environmental conditions give rise to multiple feedbacks and forcings on the Earth system that remain to be completely understood.
Like weathering, the synthesis of organic matter and its subsequent transport, storage, and degradation is key to the biogeochemical cycling of C, O, P, and S. However, organic matter cycling obeys a completely different set of rules than weathering, adding a richer set of dynamics to major biogeochemical cycles.
In order to study chemical weathering and organic carbon cycling across a range of spatial and temporal scales, we utilize some combination of laboratory experiments, field studies, and numerical modelling. Present research interests include: