1. Carbon cycling in a groundwater dominated stream
Collaborators:
Randy Hunt, John Walker, Wisconsin USGS
Paul Hanson, University of Wisconsin, Center for Limnology

Supported by and in collaboration with:

Recent increases in atmospheric CO₂ concentration have inspired considerable research on carbon cycling in terrestrial, marine, and freshwater ecosystems across several spatial scales.  Nonetheless, we still have a poor understanding of below-ground carbon dynamics and the role of drainage waters in carbon flux.  Toward the overall goal of improving our understanding of carbon cycling, we hope to capitalize on the unusually detailed hydrologic and geochemical knowledge and data at the Wisconsin WEBB site to investigate inorganic carbon dynamics and losses from streams.  In the proposed research we seek a mechanistic understanding of controls on inorganic carbon dynamics and losses from a north-temperate basin (Allequash Creek, Wisconsin), focusing on linkages between groundwater and stream environments.
 
 

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Chris Lowry, Randy Hunt, John Walker, and Noah Lottig (L to R) at a sampling/data recording station in the Allequash Creek fen.

Jacques Finlay working on a buoy that monitors pCO2 concentrations in streamwater.  Measurements are made every 30 minutes over the course of several days.  Several phyiscal and chemical attributes are quantified simultaneously, including groundwater inputs determined by addition of a conservative tracer, gas evasion using SF6 injection, metabolism (diel changes in O2), and water chemistry. For more information about pCO2 measurements and the buoy project, visit the buoy web page.

2. Wetland stream geomorphology
coming soon!
 
 

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