Publications
Filter Total Items: 1423
Methodology for compilation of previously published contour data showing the altitude of the base of Dakota Sandstone on the Colorado Plateau, Arizona, Colorado, New Mexico, and Utah Methodology for compilation of previously published contour data showing the altitude of the base of Dakota Sandstone on the Colorado Plateau, Arizona, Colorado, New Mexico, and Utah
Structure contours and other geologic information from numerous published geologic maps were digitized and compiled into a digital dataset showing the configuration of a single stratigraphic datum, the base of the Dakota Sandstone and its equivalents across the Colorado Plateau. The principal maps compiled in digital form are a series of 1:250,000-scale 1 degree (°) × 2° quadrangle maps...
Authors
Donald S. Sweetkind
Relating surface water dynamics in wetlands and lakes to spatial variability in hydrologic signatures Relating surface water dynamics in wetlands and lakes to spatial variability in hydrologic signatures
The retention of surface water in wetlands and lakes can modify the timing, duration, and magnitude of river discharge. However, efforts to characterize the influence of surface water on discharge regimes have been generally limited to small, wetland-dense watersheds. We developed random forest models to explain spatial variability in six hydrologic signatures, reflecting flashiness...
Authors
Melanie K. Vanderhoof, Peter Nieuwlandt, Heather E. Golden, Charles R. Lane, Jay R. Christensen, William Keenan, Wayana Dolan
Spatiotemporal variations in strain release and seismic rupture in multifault systems: An example from Panamint Valley, southeastern California Spatiotemporal variations in strain release and seismic rupture in multifault systems: An example from Panamint Valley, southeastern California
Geometrically complex, multifault ruptures have been observed in recent, damaging earthquakes in southeastern California, sparking renewed efforts to identify physical conditions that promote or inhibit fault discontinuity-spanning coseismic ruptures. The likelihood of ruptures propagating across fault discontinuities is thought to be partly controlled by fault geometries, rupture...
Authors
Aubrey LaPlante, Christine Regalla, Israporn Sethanant, Shannon A. Mahan, Harrison J. Gray
Effects of total suspended solids on photomineralization of dissolved organic matter in the Peace-Athabasca Delta, Canada Effects of total suspended solids on photomineralization of dissolved organic matter in the Peace-Athabasca Delta, Canada
Northern deltas receive chromophoric dissolved organic matter (CDOM) from their watersheds, which can be oxidized to carbon dioxide upon absorption of sunlight (i.e., photomineralized). These deltas also receive total suspended solids (TSS), which may shade sunlight absorption by CDOM, thus limiting photomineralization. To quantify this interaction for the first time, we measured
Authors
Wayana Dolan, Tamlin M. Pavelsky, Julianne Davis, Nathan LaFramboise, Catherine Polik, Rose Cory
Urban trees and cooling: A review of the recent literature (2018 to 2024) Urban trees and cooling: A review of the recent literature (2018 to 2024)
Urban trees mitigate extreme heat through shading and evapotranspiration, but cooling effectiveness varies with tree traits, spatial configurations, and climate. This systematic mapping review synthesizes findings from 115 studies (2018 to 2024) using RepOrting standards for Systematic Evidence Syntheses (ROSES) protocols. Studies were categorized based on geographic location, climate...
Authors
Michael Alonzo, Peter Christian Ibsen, Dexter Locke
Scoping decision-maker needs and science availability to support regional natural capital accounting in the U.S. Colorado River Basin Scoping decision-maker needs and science availability to support regional natural capital accounting in the U.S. Colorado River Basin
Natural capital accounting has the potential to yield important policy insights at multiple scales, but there remains a disconnect between regional-scale natural capital accounts and their use for informing policy. In this paper, we propose a roadmap that could lead to the creation of policy-relevant regional accounts, with steps split across an initial scoping phase and a subsequent...
Authors
Aaron Joey Enriquez, Kenneth J. Bagstad, Katharine G. Dahm, Alicia A. Torregrosa, Rudy Schuster
Monitoring visitor activity and informal trail disturbance in Yosemite Valley meadows to assess temporal changes in use and impacts Monitoring visitor activity and informal trail disturbance in Yosemite Valley meadows to assess temporal changes in use and impacts
Montane meadows provide vital habitat that supports ecosystems, regulate hydrological processes, and offer valuable recreational opportunities. Meadows account for 3 % of Yosemite National Park's area, including Yosemite Valley, and are particularly susceptible to human impacts such as formation of informal trails. We collected observational data on visitor activity and quantified social...
Authors
Sheri A. Shiflett, Jeffery S. Jenkins, Rachel F. Mattos, Kai Thiry, Peter Christian Ibsen, Melissa Booher, Angela Tricomi, Nicole D Athearn
Organic matter composition versus microbial source: Controls on carbon loss from fen wetland and permafrost soils Organic matter composition versus microbial source: Controls on carbon loss from fen wetland and permafrost soils
Wetland and permafrost soils contain some of Earth's largest reservoirs of organic carbon, and these stores are threatened by rapid warming across the Arctic. Nearly half of northern wetlands are affected by permafrost. As these ecosystems warm, the cycling of dissolved organic matter (DOM) and the opportunities for microbial degradation are changing. This is particularly evident as the
Authors
Sommer F. Starr, Kimberly Wickland, Anne M. Kellerman, Amy M. McKenna, Martin M. Kurek, Aubrey Miller, Ariana Karsaras, Thomas A. Douglas, Rachel Mackelprang, Ashley L. Shade, Robert G.M. Spencer
Finding the hidden orogeny – The Proterozoic polymetamorphic history of northern New Mexico Finding the hidden orogeny – The Proterozoic polymetamorphic history of northern New Mexico
Pressure–temperature–time-deformation histories provide key constraints on orogenic processes but can be affected by later overprinting. This is exemplified in the Proterozoic orogenic belts of southwestern Laurentia where competing tectonic models involve either a single progressive Mesoproterozoic event, the Picuris orogeny, or a polyorogenic history that also includes the ~1.65 Ga...
Authors
Ian William Hillenbrand, Michael L Williams, Amy K. Gilmer, Karl E. Karlstrom, Michael J. Jercinovic, Daniel J Young
One-hundred fundamental, open questions to integrate methodological approaches in lake ice research One-hundred fundamental, open questions to integrate methodological approaches in lake ice research
The rate of technological innovation within aquatic sciences outpaces the collective ability of individual scientists within the field to make appropriate use of those technologies. The process of in situ lake sampling remains the primary choice to comprehensively understand an aquatic ecosystem at local scales; however, the impact of climate change on lakes necessitates the rapid...
Authors
Joshua Culpepper, Sapna Sharma, Grant Gunn, Madeline Magee, Michael Frederick Meyer, Eric Anderson, Christoper D. Arp, Sarah Cooley, Wayana Dolan, Hilary Dugan, Claude R. Duguay, Benjamin C. Jones, Georgiy Kirillin, Robert Ladwig, Matti Lepparanta, Di Long, John J. Magnuson, Tamlin Pavelsky, Sebastiano Piccolroaz, Dale M. Robertson, Bethel Steele, Manu Tom, Gesa A. Weyhenmeyer, R. Iesytn Woolway, Marguerite A. Xenopoulos, Xiao Yang
An early Holocene wet period in the southwestern United States An early Holocene wet period in the southwestern United States
Multiple generations of spring-fed streams traversed ∼800 km2 of the Las Vegas Valley in southern Nevada between ca. 10.9 ka and 8.5 ka, depositing an extensive tufa network. The scale of this network and diversity of tufa morphologies is novel in North America and offers an opportunity to obtain quantitative paleoclimate data for the region during the early Holocene. We determined...
Authors
Kathleen B. Springer, Adam M. Hudson, Jeffrey S. Pigati, Katharine W. Huntington, Andrew J. Schauer
Anatectic origin of Mississippian spodumene-bearing pegmatites in western Maine during orogenic plateau collapse Anatectic origin of Mississippian spodumene-bearing pegmatites in western Maine during orogenic plateau collapse
Spodumene pegmatites are an important lithium source, but the processes and tectonic settings in which they form are poorly understood. The Rumford pegmatite district surrounding Plumbago Mountain, western Maine, is host to numerous spodumene pegmatites, including the Plumbago North pegmatite (a world-class spodumene resource). Competing petrogenetic models for these spodumene pegmatites...
Authors
Myles M Felch, Ian William Hillenbrand, J. Dykstra Eusden, Christopher S. Holm-Denoma, Dwight C. Bradley, Amber T.H. Whittaker, Michael J. Jercinovic, Michael L. Williams, Laura Pianowski