Publications
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User guide for luminescence sampling in archaeological and geological contexts User guide for luminescence sampling in archaeological and geological contexts
Luminescence dating provides a direct age estimate of the time of last exposure of quartz or feldspar minerals to light or heat and has been successfully applied to deposits, rock surfaces, and fired materials in a number of archaeological and geological settings. Sampling strategies are diverse and can be customized depending on local circumstances, although all sediment samples need to...
Authors
Michelle S. Nelson, Harrison J. Gray, Jack A. Johnson, Tammy M. Rittenour, James K. Feathers, Shannon Mahan
Precise interpolar phasing of abrupt climate change during the last ice age Precise interpolar phasing of abrupt climate change during the last ice age
The last glacial period exhibited abrupt Dansgaard–Oeschger climatic oscillations, evidence of which is preserved in a variety of Northern Hemisphere palaeoclimate archives1. Ice cores show that Antarctica cooled during the warm phases of the Greenland Dansgaard–Oeschger cycle and vice versa2, 3, suggesting an interhemispheric redistribution of heat through a mechanism called the bipolar...
Authors
Christo Buizert, Betty M. Adrian, Jinho Ahn, Mary Albert, Richard B. Alley, Daniel Baggenstos, Thomas K. Bauska, Ryan C. Bay, Brian B. Bencivengo, Charles R. Bentley, Edward J. Brook, Nathan J. Chellman, Gary D. Clow, Jihong Cole-Dai, Howard Conway, Eric Cravens, Kurt M. Cuffey, Nelia W. Dunbar, Jon S. Edwards, John M. Fegyveresi, Dave G. Ferris, Joan J. Fitzpatrick, T. J. Fudge, Chris J. Gibson, Vasileios Gkinis, Joshua J. Goetz, Stephanie Gregory, Geoffrey Mill Hargreaves, Nels Iverson, Jay A. Johnson, Tyler R. Jones, Michael L. Kalk, Matthew J. Kippenhan, Bess G. Koffman, Karl Kreutz, Tanner W. Kuhl, Donald A. Lebar, James E. Lee, Shaun A. Marcott, Bradley R. Markle, Olivia J. Maselli, Joseph R. McConnell, Kenneth C. McGwire, Logan E. Mitchell, Nicolai B. Mortensen, Peter D. Neff, Kunihiko Nishiizumi, Richard M. Nunn, Anais J. Orsi, Daniel R. Pasteris, Joel B. Pedro, Erin C. Pettit, P. Buford Price, John C. Priscu, Rachael H. Rhodes, Julia L. Rosen, Andrew J. Schauer, Spruce W. Schoenemann, Paul J. Sendelbach, Jeffrey P. Severinghaus, Alexander J. Shturmakov, Michael Sigl, Kristina R. Slawny, Joseph M. Souney, Todd A. Sowers, Matthew K. Spencer, Eric J. Steig, Kendrick C. Taylor, Mark S. Twickler, Bruce H. Vaughn, Donald E. Voigt, Edwin D. Waddington, Kees C. Welten, Anthony W. Wendricks, James W. C. White, Mai Winstrup, Gifford J. Wong, Thomas E. Woodruff
Complex terrain alters temperature and moisture limitations of forest soil respiration across a semiarid to subalpine gradient Complex terrain alters temperature and moisture limitations of forest soil respiration across a semiarid to subalpine gradient
Forest soil respiration is a major carbon (C) flux that is characterized by significant variability in space and time. We quantified growing season soil respiration during both a drought year and a nondrought year across a complex landscape to identify how landscape and climate interact to control soil respiration. We asked the following questions: (1) How does soil respiration vary...
Authors
Erin Michele Berryman, H.R. Barnard, H.R. Adams, M.A. Burns, E. Gallo, P. D. Brooks
Digital representation of oil and natural gas well pad scars in southwest Wyoming: 2012 update Digital representation of oil and natural gas well pad scars in southwest Wyoming: 2012 update
The recent proliferation of oil and natural gas energy development in the Greater Green River Basin of southwest Wyoming has accentuated the need to understand wildlife responses to this development. The location and extent of surface disturbance that is created by oil and natural gas well pad scars are key pieces of information used to assess the effects of energy infrastructure on...
Authors
Steven L. Garman, Jamie L. McBeth
Radar attenuation and temperature within the Greenland Ice Sheet Radar attenuation and temperature within the Greenland Ice Sheet
The flow of ice is temperature-dependent, but direct measurements of englacial temperature are sparse. The dielectric attenuation of radio waves through ice is also temperature-dependent, and radar sounding of ice sheets is sensitive to this attenuation. Here we estimate depth-averaged radar-attenuation rates within the Greenland Ice Sheet from airborne radar-sounding data and its...
Authors
Joseph A MacGregor, Jilu Li, John D Paden, Ginny A Catania, Gary D. Clow, Mark A Fahnestock, Prasad S. Gogineni, Robert E. Grimm, Mathieu Morlighem, Soumyaroop Nandi, Helene Seroussi, David E Stillman
Insufficient sampling to identify species affected by turbine collisions Insufficient sampling to identify species affected by turbine collisions
We compared the number of avian species detected and the sampling effort during fatality monitoring at 50 North American wind facilities. Facilities with short intervals between sampling events and high effort detected more species, but many facilities appeared undersampled. Species accumulation curves for 2 wind facilities studied for more than 1 year had yet to reach an asymptote. The...
Authors
Julie A. Beston, James E. Diffendorfer, Scott Loss
U.S. Geological Survey Unmanned Aircraft Systems (UAS) Roadmap 2014 U.S. Geological Survey Unmanned Aircraft Systems (UAS) Roadmap 2014
The U.S. Department of the Interior (DOI) is responsible for protecting the natural resources and heritage contained on almost 20 percent of the land in the United States. This responsibility requires acquisition of remotely sensed data throughout vast lands, including areas that are remote and potentially dangerous to access. One promising new technology for data collection is unmanned...
Authors
Jill J. Cress, Michael E. Hutt, Jeff L. Sloan, Mark A. Bauer, Mark R. Feller, Susan E. Goplen
Variables and potential models for the bleaching of luminescence signals in fluvial environments Variables and potential models for the bleaching of luminescence signals in fluvial environments
Luminescence dating of fluvial sediments rests on the assumption that sufficient sunlight is available to remove a previously obtained signal in a process deemed bleaching. However, luminescence signals obtained from sediment in the active channels of rivers often contain residual signals. This paper explores and attempts to build theoretical models for the bleaching of luminescence...
Authors
Harrison J. Gray, Shannon Mahan
Luminescence dating of anthropogenic features of the San Luis Valley, Colorado: from stone huts to stone walls Luminescence dating of anthropogenic features of the San Luis Valley, Colorado: from stone huts to stone walls
The Snake Nest Wall site and the Crestone Stone Huts are in the northern San Luis Valley, Colorado, and provide a unique opportunity to date high-altitude archeological sites of unknown age and origin using optically stimulated luminescence (OSL). We sampled sediment underlying foundation stones of these structures to establish a chronological framework for each site's construction. OSL...
Authors
Shannon Mahan, Rebecca A. Donlan, Barbara Maat Kardos
Long-term controls of soil organic carbon with depth and time: a case study from the Cowlitz River Chronosequence, WA USA Long-term controls of soil organic carbon with depth and time: a case study from the Cowlitz River Chronosequence, WA USA
Over timescales of soil development (millennia), the capacity of soils to stabilize soil organic carbon (SOC) is linked to soil development through changes in soil mineralogy and other soil properties. In this study, an extensive dataset of soil profile chemistry and mineralogy is compiled from the Cowlitz River Chronosequence (CRC), WA USA. The CRC soils range in age from 0.25 to 1200...
Authors
Corey R. Lawrence, Jennifer W. Harden, Xiaomei Xu, Marjorie S. Schulz, Susan E. Trumbore
Field-based description of rhyolite lava flows of the Calico Hills Formation, Nevada National Security Site, Nevada Field-based description of rhyolite lava flows of the Calico Hills Formation, Nevada National Security Site, Nevada
Contaminants introduced into the subsurface of Pahute Mesa, Nevada National Security Site, by underground nuclear testing are of concern to the U.S. Department of Energy and regulators responsible for protecting human health and safety. The potential for contaminant movement away from the underground test areas at Pahute Mesa and into the accessible environment is greatest by groundwater...
Authors
Donald S. Sweetkind, Shiera C. Bova
Sample descriptions and geophysical logs for cored well BP-3-USGS, Great Sand Dunes National Park and Preserve, Alamosa County, Colorado Sample descriptions and geophysical logs for cored well BP-3-USGS, Great Sand Dunes National Park and Preserve, Alamosa County, Colorado
The BP-3-USGS well was drilled at the southwestern corner of Great Sand Dunes National Park in the San Luis Valley, south-central Colorado, 68 feet (ft, 20.7 meters [m]) southwest of the National Park Service’s boundary-piezometer (BP) well 3. BP-3-USGS is located at latitude 37°43ʹ18.06ʺN. and longitude 105°43ʹ39.30ʺW., at an elevation of 7,549 ft (2,301 m). The well was drilled through...
Authors
V. J. S. Grauch, Gary L. Skipp, Jonathan V. Thomas, Joshua K. Davis, Mary Ellen Benson