Research interests center on the geochemical cycling of inorganic compounds between the lithosphere, hydrosphere, atmosphere and cryosphere. Environmental radionuclides (both natural and anthropogenic) as tracers of such cycling are the primary focus of my research. The Glacier Research Group's Keck radionuclide counting laboratory (under my direction) allows quantification of a range of alpha, beta and gamma emmiting isotopes at trace levels. Current research programs all also include analyses of the major soluble ionic species in the atmosphere, in gas, aerosol and precipitation (mainly snow) samples. A newly acquired "field" ion chromatograph allows for near real time QA/QC and feedback on the results of sampling even at remote locations.

My largest ongoing programs are the investigation of air to snow transfer processes at Summit, Greenland and participation in NASA's Global Tropospheric Chemistry program. Current funded research also includes investigation of snow photochemistry at South Pole, and use of the natural radionuclide tracers to constrain erosion rates and sediment yield in New Zealand (with Berry Lyons and Anne Carey).

I am also trying to start active research into organic aerosols. This effort involves collaboration with Rob Griffin and Barkley Sive here in New Hampshire, and also with Mike Bergin (Ga Tech) and Jamie Schauer (U. Wisc) investigating the sources and transformations of organic matter incorporated into the snow at Summit.