Geosciences and Environmental Change Science Center
February 15, 2017
Uranium delivery and uptake in a montane wetland, north-central Colorado, USA
By Randy Schumann (GECSC), Robert Zielinski, Jim Otton, Mike Pantea (GECSC), and William Orem. Published in Applied Geochemistry.
Comprehensive sampling of peat, underlying lakebed sediments, and coexisting waters of a naturally uraniferous montane wetland in north-central Colorado were combined in this study with hydrologic measurements to define the important controls on uranium supply and uptake. The report shows that the major source of uranium to the wetland is groundwater flowing through locally fractured and faulted granite gneiss.
February 14, 2017
Controls on the chemical composition of saline surface crusts and emitted dust from a wet playa in the Mojave Desert (USA)
By Harland Goldstein (GECSC), George Breit, Rich Reynolds (GECSC). Published in the Journal of Arid Environments.
This study determined the compositional controls on atmospheric dust emitted from salt-crusted playas by documenting how variations in the chemical composition of salt crusts and subsurface sediments are related to variations in groundwater composition and evaporative factors. By demonstrating the hydrogeologic and compositional linkages among groundwater, surface crust, and dust, this study provides a basis for understanding the controls on dust composition in evaporative discharge settings in drylands elsewhere. These findings bear on issues of water quality, plant-community distributions, formation and extraction of economic salt deposits, as well as potential risks to human health.
February 13, 2017
DOI/GTN-P Climate and active-layer data acquired in the National Petroleum Reserve-Alaska and the Arctic National Wildlife Refuge, 1998-2015
By Frank Urban and Gary Clow. USGS Data Series 1021.
This report provides data collected by the climate monitoring array of the U.S. Department of the Interior on Federal lands in Arctic Alaska over the period August 1998 to July 2015. In addition to presenting data, this report also describes monitoring, data collection, and quality control methodology. Data collection by the 16 stations in the array is ongoing and done in close collaboration with the Bureau of Land Management and the U.S. Fish and Wildlife Service.
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