Aquatic Carbon Cycling

Linkages: terrestrial-aquatic, organic-inorganic

My main research interest is in aquatic carbon cycling in small headwater catchments of North America. My field sites include small streams in: interior Alaska, Colorado's Rocky Mountain National Park, the lake-rich region of northern Wisconsin, the Sleepers River watershed in Vermont, the Panola Mountain watershed in Georgia, and the Luquillo watershed in Puerto Rico. I am interested in how streams contribute to the global carbon cycle and how they interact with their surrounding landcape features including forests, wetlands, lakes, and groundwater.


Greenhouse Gas Emissions

Carbon Dioxide and Methane

I study the emissions of greenhouse gases from streams and rivers to the atmosphere. Carbon Dioxide and methane gas are typically super-saturated in small streams and rivers and these gases are constantly being emitted. I am using a combination of direct chamber measurments (as seen in the picture), in situ sensors and standard water sampling methods to describe fluxes of greenhouse gases at the stream-atmosphere interface. I am also investigating the sources of stream gases using analyses of aquatic metabolism, catchment hydrology and carbon isotopes of dissolved gases. I am also interested in the difficult problems of estimating and modelling gas transfer velocities, and estimating the surface area of streams and rivers at large geographical scales.