I am using natural radioisotope distributions in the ocean to quantify chemical fluxes of climatic and biogeochemical relevance. For instance, aerosol mineral dust and the trace metal nutrients this dust releases, such as iron, are important parameters in terms of continental erosion, atmospheric circulation and marine phytoplankton productivity. I am currently pursuing a time-series study in the North Pacific to document changes in lithogenic and radiogenic thorium isotopes. The goal is to relate these data to variability in mineral dust flux and trace metal delivery, potentially on timescales from seasons to several decades.
I also have a continuing interest in understanding physical and biogeochemical change in the ocean throughout the Pleistocene.