Publications
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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 Daniel, Bronwyn Rayfield, Jason T. Sherba, Todd Hawbaker, Zhiliang Zhu, Paul 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
Wetlands inform how climate extremes influence surface water expansion and contraction Wetlands inform how climate extremes influence surface water expansion and contraction
Effective monitoring and prediction of flood and drought events requires an improved understanding of how and why surface water expansion and contraction in response to climate varies across space. This paper sought to (1) quantify how interannual patterns of surface water expansion and contraction vary spatially across the Prairie Pothole Region (PPR) and adjacent Northern Prairie (NP)...
Authors
Melanie K. Vanderhoof, Charles R. Lane, Michael L. McManus, Laurie C. Alexander, Jay R. Christensen
Rapid growth of the US wildland-urban interface raises wildfire risk Rapid growth of the US wildland-urban interface raises wildfire risk
The wildland-urban interface (WUI) is the area where houses and wildland vegetation meet or intermingle, and where wildfire problems are most pronounced. Here we report that the WUI in the United States grew rapidly from 1990 to 2010 in terms of both number of new houses (from 30.8 to 43.4 million; 41% growth) and land area (from 581,000 to 770,000 km2; 33% growth), making it the fastest...
Authors
Volker C. Radeloff, David P. Helmers, H. Anu Kramer, Miranda H. Mockrin, Patricia M. Alexandre, Avi Bar-Massada, Van Butsic, Todd Hawbaker, Sebastian Martinuzzi, Alexandra D. Syphard, Susan I. Stewart
The geochemistry of loess: Asian and North American deposits compared The geochemistry of loess: Asian and North American deposits compared
Loess is widely distributed over Asia and North America and constitutes one of the most important surficial deposits that serve as terrestrial records of the Quaternary. The oldest Pleistocene loess in China is likely ∼2.6 Ma, thus spanning much or all of the Pleistocene. In North America, most loess is no older than the penultimate glacial period, with the exception of Alaska, where the...
Authors
Daniel R. Muhs
Anthropogenic impact in the Mayan Lowlands of Petén, Guatemala, during the last 5500 years Anthropogenic impact in the Mayan Lowlands of Petén, Guatemala, during the last 5500 years
Trace and rare earth elements from a Lake Peten Itzá (Guatemala) sediment core depict the geochemical dynamics affecting the lake from ~5500 y BP to the present. This timing encompasses the Preclassic (4000 to 1700 y BP) and Classic Periods (1700-1000 y BP) when thriving Maya societies extensively cleared land for agriculture. We demonstrate that this land use occurred during times of...
Authors
D. Battistel, Marco Roman, A Marchetti, Natalie M. Kehrwald, Marta Radaelli, Eleanora Balliana, Giuseppina Toscano, Carlo Barbante
The sensitivity of ecosystem service models to choices of input data and spatial resolution The sensitivity of ecosystem service models to choices of input data and spatial resolution
Although ecosystem service (ES) modeling has progressed rapidly in the last 10–15 years, comparative studies on data and model selection effects have become more common only recently. Such studies have drawn mixed conclusions about whether different data and model choices yield divergent results. In this study, we compared the results of different models to address these questions at...
Authors
Kenneth J. Bagstad, Erika Cohen, Zachary H. Ancona, Steven McNulty, Ge Sun
Prospects for reconstructing paleoenvironmental conditions from organic compounds in polar snow and ice Prospects for reconstructing paleoenvironmental conditions from organic compounds in polar snow and ice
Polar ice cores provide information about past climate and environmental changes over periods ranging from a few years up to 800,000 years. The majority of chemical studies have focused on determining inorganic components, such as major ions and trace elements as well as on their isotopic fingerprint. In this paper, we review the different classes of organic compounds that might yield
Authors
Chiara Giorio, Natalie M. Kehrwald, Carlo Barbante, Markus Kalberer, Amy C.F. King, Elizabeth R. Thomas, Eric W. Wolff, Piero Zennaro