Geosciences and Environmental Change Science Center

Publications

Filter Total Items: 1,154
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Year Published: 2019

Mammut pacificus sp. nov., a newly recognized species of mastodon from the Pleistocene of western North America

A new species of mastodon from the Pleistocene of western North America, Mammut pacificus sp. nov. is herein recognized, with specimens identified throughout California and from two localities in southern Idaho. This new taxon differs from the contemporaneous M. americanum in having narrower teeth, most prominently in M3/m3, as...

Dooley Jr., Alton C; Scott, Eric; Green, Jeremy; Springer, Kathleen B.; Dooley, Brett; Smith, Gregory J.

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Year Published: 2019

North-south dipole in winter hydroclimate in the western United States during the last deglaciation

During the termination of the last glacial period the western U.S. experienced exceptionally wet conditions, driven by changes in location and strength of the mid-latitude winter storm track. The distribution of modern winter precipitation is frequently characterized by a north-south wet/dry dipole pattern, controlled by interaction of the storm...

Hudson, Adam M.; Hatchett, Benjamin J.; Quade, Jay; Boyle, Douglas P.; Bassett, Scott D.; Ali, Guleed; De los Santos, Marie G.

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Year Published: 2019

Evidence for non-steady-state carbon emissions from snow-scoured alpine tundra

High-latitude warming is capable of accelerating permafrost degradation and the decomposition of previously frozen carbon. The existence of an analogous high-altitude feedback, however, has yet to be directly evaluated. We address this knowledge gap by coupling a radiocarbon-based model to 7 years (2008–2014) of continuous eddy covariance data...

Knowles, John F.; Blanken, Peter D. ; Lawrence, Corey; Williams, Mark W.

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Year Published: 2019

A supervolcano and its sidekicks: A 100 ka eruptive chronology of the Fish Canyon Tuff and associated units of the La Garita magmatic system

Establishing temporal constrains on major volcanic eruptions is limited by the precision of existing geochronometers. Prior work on the La Garita caldera, created by the eruption of the Fish Canyon Tuff, failed to resolve temporal differences between pre-, syn-, and post-collapse eruptive units. Here, we report 40Ar/39Ar geochronologic data...

Morgan, Leah E.; Johnstone, Samuel A.; Gilmer, Amy K.; Cosca, Michael A.; Thompson, Ren A.
Morgan, L. E., Johnstone, S. A., Gilmer, A. K., Cosca, M. A., & Thompson, R. A. (2019). A supervolcano and its sidekicks: A 100 ka eruptive chronology of the Fish Canyon Tuff and associated units of the La Garita magmatic system, Colorado, USA. Geology, 47(5), 453-456.

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Year Published: 2019

Applying the Community Ice Sheet Model to evaluate PMIP3 LGM climatologies over the North American ice sheets

We apply the Community Ice Sheet Model (CISM2) to determine the extent to which the Last Glacial Maximum (LGM) temperature and precipitation climatologies from the Paleoclimate Modelling Intercomparison Project 3 (PMIP3) simulations support the large North American ice sheets that were prescribed as a boundary condition. We force CISM2 with eight...

Alder, Jay R.; Hostetler, Steven W.

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Year Published: 2019

Historical background and current developments for mapping burned area from satellite Earth observation

Fire has a diverse range of impacts on Earth's physical and social systems. Accurate and up to date information on areas affected by fire is critical to better understand drivers of fire activity, as well as its relevance for biogeochemical cycles, climate, air quality, and to aid fire management. Mapping burned areas was traditionally done...

Chuvieco, Emilio; Mouillot, Flourent; van der Werf, Guido R.; San Miguel, Jesús; Tanasse, Mihai; Koutsias, Nikos; García, Mariano; Yebra, Marta; Padilla, Marc; Heil, Angelika; Hawbaker, Todd J.; Giglio, Louis

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Year Published: 2019

An assessment of plant species differences on cellulose oxygen isotopes from two Kenai Peninsula, Alaska peatlands: Implications for hydroclimatic reconstructions

Peat cores are valuable archives of past environmental change because they accumulate plant organic matter over millennia. While studies have primarily focused on physical, ecological, and some biogeochemical proxies, cores from peatlands have increasingly been used to interpret hydroclimatic change using stable isotope analyses of cellulose...

Jones, Miriam; Anderson, Lesleigh; Keller, Katherine; Nash, Bailey; Littell, Virginia; Wooller, Matthew J.; Jolley, Chelsea

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Year Published: 2019

Geologic map of the Hartsel Quadrangle, Park County, Colorado

The Hartsel quadrangle sits nearly in the center of the complex South Park Laramide structural basin. Generally, the basin can be described as an asymmetrical down-faulted feature, dipping to the east. It is bounded by two northwest-trending uplifts: the Sawatch uplift to the west and the Front Range uplift to the east. The west-verging Elkhorn...

Barkmann, Peter E.; Houck, Karen J.; Dechesne, Marieke; Lovekin, Jonathan R.; Johnson, Erinn P.
Barkmann, Peter E., Karen J. Houck, Marieke Dechesne, Jonathan R. Lovekin, and Erinn P. Johnson. “OF-17-04 Geologic Map of the Hartsel Quadrangle, Park County, Colorado.” Geologic, 1:24,000. Open File Reports. Golden, CO: Colorado Geological Survey, 2019.

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Year Published: 2019

Reimagining the potential of Earth observations for ecosystem service assessments

The benefits nature provides to people, called ecosystem services, are increasingly recognized and accounted for in assessments of infrastructure development, agricultural management, conservation prioritization, and sustainable sourcing. These assessments are often limited by data, however, a gap with tremendous potential to be filled...

Ramirez-Reyes, Carlos; Brauman, Kate A.; Chaplin-Kramer, Rebecca; Galford, Gillian L.; Adamo, Susana B.; Anderson, Christopher B.; Anderson, Clarissa; Allington, Ginger R. H.; Bagstad, Kenneth J.; Coe, Michael T.; Cord, Anna F.; Dee, Laura E.; Gould, Rachelle K.; Jain, Meha; Kowal, Virginia A.; Muller-Karger, Frank E.; Norriss, Jessica; Potapov, Peter V.; Qui, Jiangxiao; Rieb, Jesse T.; Robinson, Brian E.; Samberg, Leah H.; Singh, Nagendra; Szeto, Sabrina H.; Voigt, Brian; Watson, Keri; Wright, T. Maxwell

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Year Published: 2019

Oxygen isotopic investigation of silicic magmatism in the Stillwater caldera complex, Nevada: Generation of large-volume, low-δ18O rhyolitic tuffs and assessment of their regional context in the Great Basin of the western United States

Successive caldera-forming eruptions from ca. 30 to 25 Ma generated a large nested caldera complex in western Nevada that was subsequently dissected by Basin and Range extension, providing extraordinary cross-sectional views through diverse volcanic and plutonic rocks. A high-resolution oxygen isotopic study was conducted on units that represent...

Watts, Kathryn E.; John, David A.; Colgan, Joseph P.; Henry, Christopher D.; Bindeman, Ilya N.; Valley, John W.

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Year Published: 2019

The potential role of very high-resolution imagery to characterise lake, wetland and stream systems across the Prairie Pothole Region, United States

Aquatic features critical to watershed hydrology range widely in size from narrow, shallow streams to large, deep lakes. In this study we evaluated wetland, lake, and river systems across the Prairie Pothole Region to explore where pan-sharpened high-resolution (PSHR) imagery, relative to Landsat imagery, could provide additional data on surface...

Vanderhoof, Melanie K.; Lane, Charles R.

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Year Published: 2019

Multi-country willingness to pay for transborder migratory species conservation: A case study of Northern Pintails

Using contingent valuation, we estimated willingness to pay (WTP) in Canada, Mexico, and the United States to protect habitat for Northern Pintails (hereafter pintails), a migratory waterfowl species that provides benefits to and requires habitat in the three countries. Our study contributes to research on...

Haefele, Michelle; Loomis, John B.; Lien, Aaron M.; Dubovsky, James A.; Merideth, Robert W.; Bagstad, Kenneth J.; Huang, Ta-Ken; Mattsson, Brady J.; Semmens, Darius J.; Thogmartin, Wayne E.; Wiederholt, Ruscena; Diffendorfer, James E.; Lopez-Hoffman, Laura