Research Chemist
Geology, Geophysics, and Geochemistry Science Center
Email:
cmills@usgs.gov
Office Phone:
303-236-5529
Fax:
303-236-3200
ORCID:
0000-0001-8414-1414
Supervisor:
Kate M Campbell-Hay
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Our research focuses on the abiotic and biotic factors that regulate greenhouse gas fluxes of PPR wetlands and uplands to reduce the uncertainties associated with temporal and spatial variability that characterizes these wetland systems. Our studies range from plot-level experiments in wetland catchments situated in grasslands and agricultural fields, to regional- and national-scale modeling to predict changes in soil processes associated with climate and land use. We use a combination of commercial and custom-made sampling devices to facilitate the collection of temporally-intensive data. The ability to extrapolate plot-level fluxes and to assess potential effects of climate and land-use change on wetland ecosystems...
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Inland waters are increasingly recognized as critical sites of methane emissions to the atmosphere, but the biogeochemical reactions driving such fluxes are less well understood. The Prairie Pothole Region (PPR) of North America is one of the largest wetland complexes in the world, containing millions of small, shallow wetlands. The sediment pore waters of PPR wetlands contain some of the highest concentrations of dissolved organic carbon (DOC) and sulfur species ever recorded in terrestrial aquatic environments. Using a suite of geochemical and microbiological analyses, we measured the impact of sedimentary carbon and sulfur transformations in these wetlands on methane fluxes to the atmosphere. This research represents...
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Groundwater, soil pore water, and surface water were collected in and near wetland P1 in the Cottonwood Lake Study Area, Stutsman County, North Dakota in August 2013. Groundwater was collected from established wells (17, 18, and 22) via peristaltic pump. Surface water was collected from P1 ponded water via grab sample. Soil pore water was collected using drive point samplers and one suction lysimeter. Water samples were analyzed for pH and major ion chemistry.
Categories: Data;
Tags: Atomic Emission Spectroscopy,
Chemical Analyses,
Cottonwood Lake Study Area,
Geochemistry,
Geochemistry, All tags...
Mass Spectrometry,
Missouri Coteau,
North Dakota,
Salinity,
Stutsman County,
USGS Science Data Catalog (SDC),
Water Chemistry,
Wetland, Fewer tags
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Through a resampling of 178 prairie lakes and wetlands originally sampled in the late 1960s and early 1970s, we are exploring changes in water chemical composition that have occurred in response to shifting climate patterns and the affects of these changes on fish and wildlife communities.
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