Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Nitrate in aquifers beneath agricultural systems Nitrate in aquifers beneath agricultural systems
Research from several regions of the world provides spatially anecdotal evidence to hypothesize which hydrologic and agricultural factors contribute to groundwater vulnerability to nitrate contamination. Analysis of nationally consistent measurements from the U.S. Geological Survey's NAWOA program confirms these hypotheses for a substantial range of agricultural systems. Shallow...
Authors
M. R. Burkart, J.D. Stoner
Nitrogen retention in rivers: Model development and application to watersheds in the northeastern U.S.A. Nitrogen retention in rivers: Model development and application to watersheds in the northeastern U.S.A.
A regression model (RivR-N) was developed that predicts the proportion of N removed from streams and reservoirs as an inverse function of the water displacement time of the water body (ratio of water body depth to water time of travel). When applied to 16 drainage networks in the eastern U.S., the RivR-N model predicted that 37% to 76% of N input to these rivers is removed during...
Authors
S.P. Seitzinger, R.V. Styles, E.W. Boyer, R. B. Alexander, G. Billen, R. W. Howarth, B. Mayer, N. Van Breemen
North-central Oregon Cascades; exploring petrologic and tectonic intimacy in a propagating intra-arc rift North-central Oregon Cascades; exploring petrologic and tectonic intimacy in a propagating intra-arc rift
No abstract available.
Authors
Richard M. Conrey, Edward M. Taylor, Julie M. Donnelly-Nolan, David R. Sherrod
On-orbit radiometric calibration over time and between spacecraft using the moon On-orbit radiometric calibration over time and between spacecraft using the moon
The Robotic Lunar Observatory (ROLO) project has developed a spectral irradiance model of the Moon that accounts for variations with lunar phase through the bright half of a month, lunar librations, and the location of an Earth-orbiting spacecraft. The methodology of comparing spacecraft observations of the Moon with this model has been developed to a set of standardized procedures so...
Authors
H. H. Kieffer, T.C. Stone, R.A. Barnes, S. Bender, R.E. Eplee, J. Mendenhall, L. Ong
Operating the EOSDIS at the land processes DAAC managing expectations, requirements, and performance across agencies, missions, instruments, systems, and user communities Operating the EOSDIS at the land processes DAAC managing expectations, requirements, and performance across agencies, missions, instruments, systems, and user communities
NASA developed the Earth Observing System (EOS) during the 1990'S. At the Land Processes Distributed Active Archive Center (LP DAAC), located at the USGS EROS Data Center, the EOS Data and Information System (EOSDIS) is required to support heritage missions as well as Landsat 7, Terra, and Aqua. The original system concept of the early 1990'S changed as each community had its say - first...
Authors
T. A. Kalvelage
Persistent organic pollutants in murre eggs from the Gulf of Alaska and Bering Sea Persistent organic pollutants in murre eggs from the Gulf of Alaska and Bering Sea
No abstract available.
Authors
John R. Kucklick, Stacy S. Vander Pol, P.R. Becker, Rebecca S. Pugh, Kristin S. Simac, G.W. York, D.G. Rosenau
Polar bear management in Alaska 1997-2000 Polar bear management in Alaska 1997-2000
Since the Twelfth Working Meeting of the IUCN/SSC Polar Bear Specialist Group in 1997, a number of changes in the management of polar bears have occurred in Alaska. On October 16, 2000, the governments of the United States and the Russian Federation signed the “Agreement on the Conservation and Management of the Alaska-Chukotka Polar Bear Population.” This agreement provides substantial...
Authors
Scott L. Schliebe, John W. Bridges, Thomas J. Evans, Anthony S. Fischbach, Susanne B. Kalxdorff, Lisa J. Lierheimer
Preliminary Results of a High-Resolution Aeromagnetic Survey to Identify Buried Faults at Dixie Valley, Nevada Preliminary Results of a High-Resolution Aeromagnetic Survey to Identify Buried Faults at Dixie Valley, Nevada
Preliminary results from a high-resolution aeromagnetic survey (200 m line spacing) acquired in Dixie Valley early in 2002 provide confirmation of intra-basin faulting based on subtle surface indications. In addition the data allow identification of the locations and trends of many faults that have not been recognized at the surface, and provide a picture of intrabasin faulting patterns...
Authors
R.P. Smith, V. J. S. Grauch, D.D. Blackwell
Prioritizing High-Temperature Geothermal Resources in Utah Prioritizing High-Temperature Geothermal Resources in Utah
The Utah Geological Survey and the Utah Energy Office recently released geothermal resource information for Utah as a "digital atlas." We are now expanding this project to include economic analyses of selected geothermal sites and previously unavailable resource information. The enhancements to the digital atlas will include new resource, demographic, regulatory, economic, and other...
Authors
R.E. Blackett, T.C. Brill, G.M. Sowards
Radiation pattern of a borehole radar antenna Radiation pattern of a borehole radar antenna
To understand better how a borehole antenna radiates radar waves into a formation, this phenomenon is simulated numerically using the finite-difference, time-domain method. The simulations are of two different antenna models that include features like a driving point fed by a coaxial cable, resistive loading of the antenna, and a water-filled borehole. For each model, traces are...
Authors
K.J. Ellefsen, D.L. Wright
Real-time water quality monitoring and regression analysis to estimate nutrient and bacteria concentrations in Kansas streams Real-time water quality monitoring and regression analysis to estimate nutrient and bacteria concentrations in Kansas streams
An innovative approach currently is underway in Kansas to estimate and monitoring constituent concentrations in streams. Continuous in-stream water-quality monitors are installed at selected U.S. Geological Survey stream-gaging stations to provide real-time measurement of specific conductance, pH, water temperature, dissolved oxygen, turbidity, and total chlorophyll. In addition...
Authors
V.G. Christensen, P.P. Rasmussen, A.C. Ziegler