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Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.

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Estimating soil erosion using the USPED model and consecutive remotely sensed land cover observations Estimating soil erosion using the USPED model and consecutive remotely sensed land cover observations

Intensified soil erosion contributes to the degradation of ecosystems. Better estimation of soil erosion across landscapes is a necessary part of understanding ecosystem biogeochemical cycles and ecosystem sustainability. In this study, we used the Unit Stream Power-based Erosion Deposition (USPED) model to estimate the lateral movement of soils across Fort Benning, a military training
Authors
Jinxun Liu, Shuguang Liu, Larry L. Tieszen, Mingshi Chen
By
Earth Resources Observation and Science (EROS) Center , Western Geographic Science Center

Optimization of an ecosystem model through the assimilation of eddy flux observations using a smoothed ensemble Kalman filter Optimization of an ecosystem model through the assimilation of eddy flux observations using a smoothed ensemble Kalman filter

The parameters of ecosystem models are conventionally optimized through nonsequential inversion methods, which treat observations as a whole and lack the flexibility to investigate possible temporal evolution of the model parameters. This research developed a smoothed ensemble Kalman filter (SEnKF) to assess to what extent the parameters and state variables of an ecosystem model can be
Authors
M. Chen, S. Liu, L. Tieszen
By
Earth Resources Observation and Science (EROS) Center

High-resolution climate records of the past 2,400 years from the offshore of northernmost California and central Oregon High-resolution climate records of the past 2,400 years from the offshore of northernmost California and central Oregon

High resolution diatom and pollen data from piston core TN062 0550 off northernmost California, and Kasten core WW7710A-26 off coastal Oregon, are compiled for the past 2,400 years. Diatom proxy data for Fall SST from both cores record warm SST's in the intervals from ca. AD 400 to 600, and from ca. AD 1050 to 1300 (later part of the Medieval Warm Period). The intervening AD 650 to 1000...
Authors
John A. Barron, Linda E. Heusser
By
Volcano Hazards Program, Volcano Science Center

Gas generation from groundwater interaction with an iron treatment wall, Fry Canyon, Utah, USA Gas generation from groundwater interaction with an iron treatment wall, Fry Canyon, Utah, USA

Gas generation from groundwater interaction with a field-scale zero-valent iron permeable reactive barrier (ZVI PRB) was measured and simulated with the geochemical reaction path model PHREEQC. Due to anaerobic corrosion of Fe (0) within the ZVI PRB, measured total dissolved gas (TDG) pressure exceeded hydrostatic pressure resulting in ebullition and depletion in dissolved noble gases...
Authors
D.L. Naftz, B.J. Stolp, C.C. Fuller, T. Snyder, M. Wilkins

Subsurface monitoring of anthropogenic CO 2 injected in sedimentary basins: Results from the Frio-I brine test, Texas, USA Subsurface monitoring of anthropogenic CO 2 injected in sedimentary basins: Results from the Frio-I brine test, Texas, USA

To investigate the potential for the long-term storage of CO 2 in deep saline aquifers, 1600 t of CO 2 were injected at 1500m depth into a 24-m-thick "C" sandstone of the Frio Formation near Houston, Texas. Fluid samples obtained before CO 2 injection from the injection well and an observation well 30m updip showed a Na-Ca-Cl type brine with ∼93,000 mg/L TDS at saturation with CH 4, but...
Authors
Y.K. Kharaka, J.J. Thordsen, S.D. Hovorka, H.S. Nance, D.R. Cole, T.J. Phelps, K.G. Knauss

An overview of the Valles Caldera National Preserve: the natural and cultural resources An overview of the Valles Caldera National Preserve: the natural and cultural resources

The Valles Caldera National Preserve is one of New Mexico’s natural wonders and a popular area for public recreation, sustainable natural resource production, and scientific research and education. Here, we provide a concise overview of the natural and cultural history of the Preserve, including descriptions of the ecosystems, flora and fauna. We note that, at the landscape scale, the...
Authors
Robert R. Parmenter, Anastasia Steffen, Craig D. Allen
By
Ecosystems Mission Area, Fort Collins Science Center, Valles Caldera
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