Publications
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Oceanographic controls on sedimentary and geochemical facies on the Peru outer shelf and upper slope Oceanographic controls on sedimentary and geochemical facies on the Peru outer shelf and upper slope
Concentrations and characteristics of organic matter in surface sediments deposited under an intense oxygen-minimum zone (OMZ) on the Peru margin were mapped and studied in samples from deck-deployed box cores and push cores acquired by submersible on two east-west transects spanning depths of 75 to 1,000 meters (m) at 12°S and 13.5°S. On the basis of sampling and analyses of the top 1–2
Authors
Michael A. Arthur, Walter E. Dean
The role of dust storms in total atmospheric particle concentrations at two sites in the western U.S. The role of dust storms in total atmospheric particle concentrations at two sites in the western U.S.
Mineral aerosols are produced during the erosion of soils by wind and are a common source of particles (dust) in arid and semiarid regions. The size of these particles varies widely from less than 2 µm to larger particles that can exceed 50 µm in diameter. In this study, we present two continuous records of total suspended particle (TSP) concentrations at sites in Mesa Verde and...
Authors
Jason C. Neff, Richard L. Reynolds, Seth M. Munson, Daniel Fernandez, Jayne Belnap
A comparative assessment of tools for ecosystem services quantification and valuation A comparative assessment of tools for ecosystem services quantification and valuation
To enter widespread use, ecosystem service assessments need to be quantifiable, replicable, credible, flexible, and affordable. With recent growth in the field of ecosystem services, a variety of decision-support tools has emerged to support more systematic ecosystem services assessment. Despite the growing complexity of the tool landscape, thorough reviews of tools for identifying...
Authors
Kenneth J. Bagstad, Darius J. Semmens, Sissel Waage, Robert Winthrop
Wyoming Basin Rapid Ecoregional Assessment Wyoming Basin Rapid Ecoregional Assessment
The overall goal of the Wyoming Basin Rapid Ecoregional Assessment (REA) is to provide information that supports regional planning and analysis for the management of ecological resources. The REA provides an assessment of baseline ecological conditions, an evaluation of current risks from drivers of ecosystem change (including energy development, fire, and invasive species), and a...
Authors
Natasha B. Carr, Robert E. Means
Comparing approaches to spatially explicit ecosystem service modeling: a case study from the San Pedro River, Arizona Comparing approaches to spatially explicit ecosystem service modeling: a case study from the San Pedro River, Arizona
Although the number of ecosystem service modeling tools has grown in recent years, quantitative comparative studies of these tools have been lacking. In this study, we applied two leading open-source, spatially explicit ecosystem services modeling tools – Artificial Intelligence for Ecosystem Services (ARIES) and Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) – to the...
Authors
Kenneth J. Bagstad, Darius J. Semmens, Robert Winthrop
Onset of deglacial warming in West Antarctica driven by local orbital forcing Onset of deglacial warming in West Antarctica driven by local orbital forcing
The cause of warming in the Southern Hemisphere during the most recent deglaciation remains a matter of debate. Hypotheses for a Northern Hemisphere trigger, through oceanic redistributions of heat, are based in part on the abrupt onset of warming seen in East Antarctic ice cores and dated to 18,000 years ago, which is several thousand years after high-latitude Northern Hemisphere summer
Authors
WAIS Divide Project Members, T. J. Fudge, Eric J. Steig, Bradley R. Markle, Spruce W. Schoenemann, Qinghua Ding, Kendrick C. Taylor, Joseph R. McConnell, Edward J. Brook, Todd Sowers, James W. C. White, Richard B. Alley, Hai Cheng, Gary D. Clow, Jihong Cole-Dai, Howard Conway, Kurt M. Cuffey, Jon S. Edwards, R. Lawrence Edwards, Ross Edwards, John M. Fegyveresi, David Ferris, Joan J. Fitzpatrick, Jay Johnson, Geoffrey Hargreaves, James E. Lee, Olivia J. Maselli, William Mason, Kenneth C. McGwire, Logan E. Mitchell, Nicolai B. Mortensen, Peter Neff, Anais J. Orsi, Trevor J. Popp, Andrew J. Schauer, Jeffrey P. Severinghaus, Michael Sigl, Matthew K. Spencer, Bruce H. Vaughn, Donald E. Voigt, Edwin D. Waddington, Xianfeng Wang, Gifford J. Wong
Locations and attributes of wind turbines in New Mexico, 2011 Locations and attributes of wind turbines in New Mexico, 2011
This dataset represents an update to U.S. Geological Survey Data Series 596. Locations and attributes of wind turbines in New Mexico, 2009 (available at http://pubs.usgs.gov/ds/596/).This updated New Mexico wind turbine Data Series provides geospatial data for all 562 wind turbines established within the State of New Mexico as of June 2011, an increase of 155 wind turbines from 2009...
Authors
Natasha B. Carr, James B. Diffendorfer, Tammy S. Fancher, Sarah J. Hawkins, Natalie Latysh, Kenneth J. Leib, Anne Marie Matherne
Locations and attributes of wind turbines in Colorado, 2011 Locations and attributes of wind turbines in Colorado, 2011
This dataset represents an update to U.S. Geological Survey Data Series 597. Locations and attributes of wind turbines in Colorado, 2009 (available at http://pubs.usgs.gov/ds/597/). This updated Colorado wind turbine Data Series provides geospatial data for all 1,204 wind turbines established within the State of Colorado as of September 2011, an increase of 297 wind turbines from 2009...
Authors
Natasha B. Carr, James E. Diffendorfer, Tammy S. Fancher, Sarah J. Hawkins, Natalie Latysh, Kenneth J. Leib, Anne Marie Matherne
An application of Social Values for Ecosystem Services (SolVES) to three national forests in Colorado and Wyoming An application of Social Values for Ecosystem Services (SolVES) to three national forests in Colorado and Wyoming
Despite widespread recognition that social-value information is needed to inform stakeholders and decision makers regarding trade-offs in environmental management, it too often remains absent from ecosystem service assessments. Although quantitative indicators of social values need to be explicitly accounted for in the decision-making process, they need not be monetary. Ongoing efforts...
Authors
Benson C. Sherrouse, Darius J. Semmens, Jessica M. Clement
Simulated impacts of mountain pine beetle and wildfire disturbances on forest vegetation composition and carbon stocks in the Southern Rocky Mountains Simulated impacts of mountain pine beetle and wildfire disturbances on forest vegetation composition and carbon stocks in the Southern Rocky Mountains
Forests play an important role in sequestering carbon and offsetting anthropogenic greenhouse gas emissions, but changing disturbance regimes may compromise the capability of forests to store carbon. In the Southern Rocky Mountains, a recent outbreak of mountain pine beetle (Dendroctonus ponderosae; MPB) has caused levels of tree mortality that are unprecedented in recorded history. To...
Authors
Megan K. Caldwell, Todd Hawbaker, Jenny S. Briggs, P.W. Cigan, Susan Stitt
Radiocarbon dating late Quaternary loess deposits using small terrestrial gastropod shells Radiocarbon dating late Quaternary loess deposits using small terrestrial gastropod shells
Constraining the ages and mass accumulation rates of late Quaternary loess deposits is often difficult because of the paucity of organic material typically available for 14C dating and the inherent limitations of luminescence techniques. Radiocarbon dating of small terrestrial gastropod shells may provide an alternative to these methods as fossil shells are common in loess and contain...
Authors
Jeff S. Pigati, John P. McGeehin, Daniel R. Muhs, E. Arthur Bettis
An evaluation of Mesodon and other larger terrestrial gastropod shells for dating late Holocene and historic alluvium in the Midwestern USA An evaluation of Mesodon and other larger terrestrial gastropod shells for dating late Holocene and historic alluvium in the Midwestern USA
Understanding the history of stream erosion and changes in channel morphology is important for managing and restoring unstable streams. One of the significant challenges in this type of research is establishing accurate dating of late Holocene and historic alluvium. Here we evaluate the potential of using 14C dating and amino acid racemization (AAR) to date large terrestrial gastropod...
Authors
Monica T. Rakovan, Jason A. Rech, Jeffery S. Pigati, Jeffrey C. Nekola, Gregory C. Wiles