Publications
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Late Quaternary loess and soils on uplands in the Canyonlands and Mesa Verde areas, Utah and Colorado Late Quaternary loess and soils on uplands in the Canyonlands and Mesa Verde areas, Utah and Colorado
Thin loess deposits on the uplands of the southeastern Colorado Plateau have previously not been well studied. We sampled deposits and soils from trenches on Hatch Point (HP) mesa near Canyonlands National Park, Utah, and from two outcrops in Mesa Verde National Park, Colorado. At HP, the oldest buried unit yielded 2 optically stimulated luminescence (OSL) ages of 10,370 and 7555 yr; the...
Authors
Marith C. Reheis, Harland L. Goldstein, Richard L. Reynolds, Steven L. Forman, Shannon A. Mahan, Paul E. Carrara
Integrating forest inventory data and MODIS data to map species-level biomass in Chinese boreal forests Integrating forest inventory data and MODIS data to map species-level biomass in Chinese boreal forests
Timely and accurate knowledge of species-level biomass is essential for forest managers to sustain forest resources and respond to various forest disturbance regimes. In this study, maps of species-level biomass in Chinese boreal forests were generated by integrating Moderate Resolution Imaging Spectroradiometer (MODIS) images with forest inventory data using k nearest neighbor (kNN)...
Authors
Qinglong Zhang, Hong S. He, Yu Liang, Todd Hawbaker, Paul D. Henne, Jinxun Liu, Shengli Huang, Zhiwei Wu, Chao Huang
Atmospheric and surface climate associated with 1986–2013 wildfires in North America Atmospheric and surface climate associated with 1986–2013 wildfires in North America
We analyze climate simulations conducted with the RegCM3 regional climate model on 50‐ and 15‐km model grids to diagnose the dependence of wildfire incidence and area burned variations on monthly climate long‐term means and anomalies over North America for the period 1986–2013. We created a new wildfire database by merging the Fire Program Analysis Fire‐Occurrence Database, the National
Authors
Steven W. Hostetler, Patrick J. Bartlein, Jay R. Alder
Geochemistry and mineralogy of late Quaternary loess in the upper Mississippi River valley, USA: Provenance and correlation with Laurentide Ice Sheet history Geochemistry and mineralogy of late Quaternary loess in the upper Mississippi River valley, USA: Provenance and correlation with Laurentide Ice Sheet history
The midcontinent of North America contains some of the thickest and most extensive last-glacial loess deposits in the world, known as Peoria Loess. Peoria Loess of the upper Mississippi River valley region is thought to have had temporally varying glaciogenic sources resulting from inputs of sediment to the Mississippi River from different lobes of the Laurentide Ice Sheet. Here, we...
Authors
Daniel R. Muhs, E. Arthur Bettis, Gary L. Skipp
Biota connect aquatic habitats throughout freshwater ecosystem mosaics Biota connect aquatic habitats throughout freshwater ecosystem mosaics
Freshwater ecosystems are linked at various spatial and temporal scales by movements of biota adapted to life in water. We review the literature on movements of aquatic organisms that connect different types of freshwater habitats, focusing on linkages from streams and wetlands to downstream waters. Here, streams, wetlands, rivers, lakes, ponds, and other freshwater habitats are viewed...
Authors
Kate A. Schofield, Laurie C. Alexander, Caroline E. Ridley, Melanie K. Vanderhoof, Ken M. Fritz, Bradley Autrey, Julie DeMeester, William G. Kepner, Charles R. Lane, Scott Leibowitz, Amina I. Pollard
Featured collection introduction: Connectivity of streams and wetlands to downstream waters Featured collection introduction: Connectivity of streams and wetlands to downstream waters
Connectivity is a fundamental but highly dynamic property of watersheds. Variability in the types and degrees of aquatic ecosystem connectivity presents challenges for researchers and managers seeking to accurately quantify its effects on critical hydrologic, biogeochemical, and biological processes. However, protecting natural gradients of connectivity is key to protecting the range of...
Authors
Laurie C. Alexander, Ken M. Fritz, Kate Schofield, Bradley Autrey, Julie DeMeester, Heather E. Golden, David C. Goodrich, William G. Kepner, Hadas R. Kiperwas, Charles R. Lane, Stephen D. LeDuc, Scott Leibowitz, Michael G. McManus, Amina I. Pollard, Caroline E. Ridley, Melanie K. Vanderhoof, Parker J. Wigington
Connectivity of streams and wetlands to downstream waters: An integrated systems framework Connectivity of streams and wetlands to downstream waters: An integrated systems framework
Interest in connectivity has increased in the aquatic sciences, partly because of its relevance to the Clean Water Act. This paper has two objectives: (1) provide a framework to understand hydrological, chemical, and biological connectivity, focusing on how headwater streams and wetlands connect to and contribute to rivers; and (2) briefly review methods to quantify hydrological and...
Authors
Scott G. Leibowitz, Parker J. Wigington, Kate A. Schoefield, Laurie C. Alexander, Melanie K. Vanderhoof, Heather E. Golden
Desert wetlands record hydrologic variability within the Younger Dryas chronozone, Mojave Desert, USA Desert wetlands record hydrologic variability within the Younger Dryas chronozone, Mojave Desert, USA
One of the enduring questions in the field of paleohydrology is how quickly desert wetland ecosystems responded to past episodes of abrupt climate change. Recent investigations in the Las Vegas Valley of southern Nevada have revealed that wetlands expanded and contracted on millennial and sub-millennial timescales in response to changes in climate during the late Quaternary. Here, we...
Authors
Jeffrey S. Pigati, Kathleen B. Springer, Jeffrey S. Honke
T.D.A. Cockerell (1866–1948) of the University of Colorado: His contributions to the natural history of the California islands and the establishment of Channel Islands National Monument T.D.A. Cockerell (1866–1948) of the University of Colorado: His contributions to the natural history of the California islands and the establishment of Channel Islands National Monument
Theodore Dru Alison Cockerell was a naturalist at the University of Colorado from 1904 to 1947 and studied botany, zoology, and paleontology in North and South America, Asia, Australia, Africa, and Europe. In the latter part of his career, he studied the California islands and published many papers on their natural history, 16 of them in four years (1937–1940). He made important...
Authors
Daniel R. Muhs
A North American Hydroclimate Synthesis (NAHS) of the Common Era A North American Hydroclimate Synthesis (NAHS) of the Common Era
This study presents a synthesis of century-scale hydroclimate variations in North America for the Common Era (last 2000 years) using new age models of previously published multiple proxy-based paleoclimate data. This North American Hydroclimate Synthesis (NAHS) examines regional hydroclimate patterns and related environmental indicators, including vegetation, lake water elevation, stream...
Authors
Jessica R. Rodysill, Lesleigh Anderson, Thomas M. Cronin, Miriam C. Jones, Robert S. Thompson, David B. Wahl, Debra A. Willard, Jason A. Addison, Jay R. Alder, Katherine H. Anderson, Lysanna Anderson, John A. Barron, Christopher E. Bernhardt, Steven W. Hostetler, Natalie M. Kehrwald, Nicole Khan, Julie N. Richey, Scott W. Starratt, Laura E. Strickland, Michael Toomey, Claire C. Treat, G. Lynn Wingard
By
Water Resources Mission Area, Ecosystems Land Change Science Program, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Florence Bascom Geoscience Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, St. Petersburg Coastal and Marine Science Center
Effects of contemporary land-use and land-cover change on the carbon balance of terrestrial ecosystems in the United States Effects of contemporary land-use and land-cover change on the carbon balance of terrestrial ecosystems in the United States
Changes in land use and land cover (LULC) can have profound effects on terrestrial carbon dynamics, yet their effects on the global carbon budget remain uncertain. While land change impacts on ecosystem carbon dynamics have been the focus of numerous studies, few efforts have been based on observational data incorporating multiple ecosystem types spanning large geographic areas over long...
Authors
Benjamin M. Sleeter, Jinxun Liu, Colin J. Daniel, Bronwyn Rayfield, Jason T. Sherba, Todd Hawbaker, Zhiliang Zhu, Paul C. Selmants, Thomas R. Loveland
Review of the geochemistry and metallogeny of approximately 1.4 Ga granitoid intrusions of the conterminous United States Review of the geochemistry and metallogeny of approximately 1.4 Ga granitoid intrusions of the conterminous United States
The conterminous United States hosts numerous volumetrically significant and geographically dispersed granitoid intrusions that range in age from 1.50 to 1.32 billion years before present (Ga). Although previously referred to as A-type granites, most are better described as ferroan granites. These granitoid intrusions are distributed in the northern and central Rocky Mountains, the...
Authors
Edward A. du Bray, Christopher S. Holm-Denoma, Karen Lund, Wayne R. Premo