A5046662432- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Heavy metals in environment
- Soil and Water Nutrient Dynamics
- Chromium effects and bioremediation
- Peatlands and Wetlands Ecology
- Groundwater and Isotope Geochemistry
- Geochemistry and Geologic Mapping
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Geochemistry and Elemental Analysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrocarbon exploration and reservoir analysis
- Hydrology and Watershed Management Studies
- Isotope Analysis in Ecology
- Coastal wetland ecosystem dynamics
- Radioactive element chemistry and processing
- Microbial bioremediation and biosurfactants
- Analytical chemistry methods development
- Coal and Its By-products
- Botany, Ecology, and Taxonomy Studies
- Marine and coastal plant biology
- Wastewater Treatment and Nitrogen Removal
- Adsorption and biosorption for pollutant removal
- Geology and Paleoclimatology Research
Geology, Geophysics, and Geochemistry Science Center
2019-2023
United States Geological Survey
2011-2023
Denver Federal Center
2010-2018
Colorado School of Mines
2005-2013
Inland waters are increasingly recognized as critical sites of methane emissions to the atmosphere, but biogeochemical reactions driving such fluxes less well understood. The Prairie Pothole Region (PPR) North America is one largest wetland complexes in world, containing millions small, shallow wetlands. sediment pore PPR wetlands contain some highest concentrations dissolved organic carbon (DOC) and sulfur species ever recorded terrestrial aquatic environments. Using a suite geochemical...
It has been shown that EPA Method 3060A does not adequately extract Cr(VI) from chromium ore processing residue (COPR). We modified various parameters of toward understanding the transformation COPR minerals in alkaline extraction and improving NIST SRM 2701, a standard COPR-contaminated soil. Aluminum Si were major elements dissolved their concentrations solution correlated with Cr(VI). The fluid leached additional Al method-prescribed borosilicate glass vessels which appeared to suppress...
First posted September 28, 2015 For additional information, contact: Director, Northern Prairie Wildlife Research Center U.S. Geological Survey 8711 37th Street Southeast Jamestown, North Dakota 58401http://www.npwrc.usgs.gov/ The climate of the prairie pothole region America is known for variability that results in significant interannual changes water depths and volumes lakes wetlands; however, beginning July 1993, shifted to an extended period increased precipitation has likely been...
The composition and content of asphaltenes in spilled original wellhead oils from the Deepwater Horizon (DWH) incident provide information on amount oil lost processes most responsible for losses within first 80 days active spill. Spilled were collected open waters, coastal waters sediments during incident. Asphaltenes are refractory component crude but their alteration weathering prevents them being used directly as a conservative to calculate losses. is reflected by increase oxygen...
Seepage of coal-bed methane (CBM) through soils is a potential source atmospheric CH4 and also likely ancient (i.e. 14C-dead) carbon to soil microbial communities. Natural abundance 13C 14C compositions bacterial membrane phospholipid fatty acids (PLFAs) gas CO2 were used assess the incorporation CBM-derived into methanotrophs other members community. Concentrations type I II methanotroph PLFA biomarkers (16:1ω8c 18:1ω8c, respectively) elevated in CBM-impacted compared with control site....
This report describes shoreline surveys conducted in the marshes of Louisiana areas impacted by oil spilled from Deepwater Horizon offshore drilling platform Gulf Mexico. Three field expeditions were on July 7-10, August 12-14, and 24-26, 2010, central Barataria Bay Bird's Foot area at terminus Mississippi River delta. preliminary includes locations survey points, a photographic record each site, observations vegetation cover descriptions coverage water plants, including measurements...
First posted November 20, 2018 For additional information, contact: Director, Northern Prairie Wildlife Research Center U.S. Geological Survey8711 37th Street Southeast Jamestown, ND 58401 The North American Pothole Region covers about 770,000 square kilometers of the United States and Canada (including parts 5 3 provinces: Dakota, South Montana, Minnesota, Iowa, Saskatchewan, Manitoba, Alberta). Laurentide Ice Sheet shaped landscape region 12,000 to 14,000 years ago. retreat ice sheet left...