Essential elements of online information networks on invasive alien species
Annie Simpson, Elizabeth A. Sellers, Andrea Grosse, Y. Xie
2006, Conference Paper
In order to be effective, information must be placed in the proper context and organized in a manner that is logical and (preferably) standardized. Recently, invasive alien species (IAS) scientists have begun to create online networks to share their information concerning IAS prevention and control. At a special networking session...
Crustal insights from gravity and aeromagnetic analysis: Central North Slope, Alaska
R. W. Saltus, C. J. Potter, J. D. Phillips
2006, American Association of Petroleum Geologists Bulletin (90) 1495-1517
Aeromagnetic and gravity data are processed and interpreted to reveal deep and shallow information about the crustal structure of the central North Slope, Alaska. Regional aeromagnetic anomalies primarily reflect deep crustal features. Regional gravity anomalies are more complex and require detailed analysis. We constrain our geophysical models with seismic data...
Bedrock formation at Meridiani Planum
S. W. Squyres, O. Aharonson, R. E. Arvidson, J.F. Bell III, P. R. Christensen, B. C. Clark, J.A. Crisp, W. Farrand, T. Glotch, M.P. Golombek, J. Grant, J. Grotzinger, Kenneth E. Herkenhoff, J. R. Johnson, B.L. Jolliff, A.H. Knoll, S. M. McLennan, H.Y. McSween, Johnnie N. Moore, J. W. Rice Jr., N. Tosca
2006, Nature (443) E1-E2
The Mars Exploration Rover Opportunity discovered sulphate-rich sedimentary rocks at Meridiani Planum on Mars, which are interpreted by McCollom and Hynek as altered volcanic rocks. However, their conclusions are derived from an incorrect representation of our depositional model, which is upheld by more recent Rover data. We contend that all the...
Quantifying the uncertainty in site amplification modeling and its effects on site-specific seismic-hazard estimation in the upper Mississippi embayment and adjacent areas
C.H. Cramer
2006, Bulletin of the Seismological Society of America (96) 2008-2020
The Mississippi embayment, located in the central United States, and its thick deposits of sediments (over 1 km in places) have a large effect on earthquake ground motions. Several previous studies have addressed how these thick sediments might modify probabilistic seismic-hazard maps. The high seismic hazard associated with the New...
Evaluating habitat for black-footed ferrets: Revision of an existing model
Dean E. Biggins, J. Michael Lockhart, Jerry L. Godbey
2006, Conference Paper, Recovery of the black-footed ferret: Progress and continuing challenges- Proceedings of the Symposium on the Status of the Black-footed Ferret and Its Habitat, Fort Collins, Colorado, January 28-29, 2004 (Scientific Investigations Report 2005-5293)
Black-footed ferrets (Mustela nigripes) are highly dependent on prairie dogs (Cynomys spp.) as prey, and prairie dog colonies are the only known habitats that sustain black-footed ferret populations. An existing model used extensively for evaluating black-footed ferret reintroduction habitat defined complexes by interconnecting colonies with 7-km line segments. Although the...
Modeling black-footed ferret energetics: Are southern release sites better?
Lauren A. Harrington, Dean E. Biggins, A. William Alldredge
2006, Conference Paper, Recovery of the black-footed ferret: Progress and continuing challenges- Proceedings of the Symposium on the Status of the Black-footed Ferret and Its Habitat, Fort Collins, Colorado, January 28-29, 2004 (Scientific Investigations Report 2005-5293)
Several models have been developed to estimate prey requirements and to assess habitat suitability of release sites for the black-footed ferret (Mustela nigripes) (e.g., Stromberg and others, 1983; Powell and others, 1985; Biggins and others, 1993). None of these models, however, addressed possible differences in energetic requirements between sites due...
Benthic foraminiferal assemblages in Osaka Bay, southwestern Japan: Faunal changes over the last 50 years
Akira Tsujimoto, Ritsuo Nomura, Moriaki Yasuhara, Shusaku Yoshikawa
2006, Paleontological Research (10) 141-161
Live benthic foraminiferal assemblages from surface sediment in Osaka Bay collected in 1999 were analyzed to characterize the distribution of the modern foraminiferal assemblages. Foraminiferal assemblages were compared with those of previous studies to document environmental changes in Osaka Bay over the past 50 years. Sixty-one species of foraminifera belonging...
MMI attenuation and historical earthquakes in the basin and range province of western North America
W. H. Bakun
2006, Bulletin of the Seismological Society of America (96) 2206-2220
Earthquakes in central Nevada (1932-1959) were used to develop a modified Mercalli intensity (MMI) attenuation model for estimating moment magnitude M for earthquakes in the Basin and Range province of interior western North America. M is 7.4-7.5 for the 26 March 1872 Owens Valley, California, earthquake, in agreement with Beanland...
Postrelease movements and survival of adult and young black-footed ferrets
Dean E. Biggins, Jerry L. Godbey, Travis M. Livieri, Marc R. Matchett, Brent D. Bibles
2006, Conference Paper, Recovery of the black-footed ferret: Progress and continuing challenges- Proceedings of the Symposium on the Status of the Black-footed Ferret and Its Habitat, Fort Collins, Colorado, January 28-29, 2004 (Scientific Investigations Report 2005-5293)
A successful captive breeding program for highly endangered black-footed ferrets (Mustela nigripes) has resulted in surplus animals that have been released at multiple sites since 1991. Because reproductive output of captive ferrets declines after several years, many adult ferrets must be removed from captive breeding facilities annually to keep total...
Late Quaternary eolian dust in surficial deposits of a Colorado Plateau grassland: Controls on distribution and ecologic effects
R. L. Reynolds, M.C. Reheis, J. C. Neff, H. Goldstein, J. Yount
2006, Catena (66) 251-266
In a semi-arid, upland setting on the Colorado Plateau that is underlain by nutrient-poor Paleozoic eolian sandstone, alternating episodes of dune activity and soil formation during the late Pleistocene and Holocene have produced dominantly sandy deposits that support grass and shrub communities. These deposits also contain eolian dust, especially in...
A reexamination of the Sudbury landing
D.S. Ross
2006, Icarus (183) 233-234
The arrival of the massive body that led to the Sudbury impact structure has been interpreted as a relatively gentle event, with temperatures not exceeding 1300 K on the basis of the presence of fullerene-caged helium. Such temperatures are well below the 10,000 K peaks suggested in large impact modeling,...
Fault dating in the Canadian Rocky Mountains: Evidence for late Cretaceous and early Eocene orogenic pulses
B.A. van der Pluijm, P.J. Vrolijk, D.R. Pevear, C.M. Hall, J. Solum
2006, Geology (34) 837-840
Fault rocks from the classic Rocky Mountain foreland fold-and-thrust belt in south-western Canada were dated by Ar analysis of clay grain-size fractions. Using X-ray diffraction quantification of the detrital and authigenic component of each fraction, these determinations give ages for individual faults in the area (illite age analysis). The resulting...
Use of borehole radar reflection logging to monitor steam-enhanced remediation in fractured limestone--Results of numerical modelling and a field experiment
C. Gregoire, P. K. Joesten, J.W. Lane Jr.
2006, Journal of Applied Geophysics (60) 41-54
Ground penetrating radar is an efficient geophysical method for the detection and location of fractures and fracture zones in electrically resistive rocks. In this study, the use of down-hole (borehole) radar reflection logs to monitor the injection of steam in fractured rocks was tested as part of a field-scale, steam-enhanced...
Net carbon exchange across the Arctic tundra-boreal forest transition in Alaska 1981-2000
Catharine Copass Thompson, A. D. McGuire, Joy S. Clein, F. S. Chapin III, J. Beringer
2006, Conference Paper, Mitigation and Adaptation Strategies for Global Change
Shifts in the carbon balance of high-latitude ecosystems could result from differential responses of vegetation and soil processes to changing moisture and temperature regimes and to a lengthening of the growing season. Although shrub expansion and northward movement of treeline should increase carbon inputs, the effects of these vegetation changes...
Introduction to the special issue on the 2004 Parkfield earthquake and the Parkfield earthquake prediction experiment
R.A. Harris, J.R. Arrowsmith
2006, Bulletin of the Seismological Society of America (96)
The 28 September 2004 M 6.0 Parkfield earthquake, a long-anticipated event on the San Andreas fault, is the world's best recorded earthquake to date, with state-of-the-art data obtained from geologic, geodetic, seismic, magnetic, and electrical field networks. This has allowed the preearthquake and postearthquake states of the San Andreas fault...
Nearshore shore-oblique bars, gravel outcrops, and their correlation to shoreline change
C.A. Schupp, J. E. McNinch, J. H. List
2006, Marine Geology (233) 63-79
This study demonstrates the physical concurrence of shore-oblique bars and gravel outcrops in the surf zone along the northern Outer Banks of North Carolina. These subaqueous features are spatially correlated with shoreline change at a range of temporal and spatial scales. Previous studies have noted the existence of beach-surf zone...
Development of the performance confirmation program at YUCCA mountain, nevada
G.D. LeCain, D. Barr, D. Weaver, R. Snell, S.W. Goodin, F.D. Hansen
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
The Yucca Mountain Performance Confirmation program consists of tests, monitoring activities, experiments, and analyses to evaluate the adequacy of assumptions, data, and analyses that form the basis of the conceptual and numerical models of flow and transport associated with a proposed radioactive waste repository at Yucca Mountain, Nevada. The Performance...
Foreword: Understanding through modeling
C. Zheng, E. Poeter, M. Hill, J. Doherty
2006, Conference Paper, Ground Water
[No abstract available]...
Using experimental and geospatial data to estimate regional carbon sequestration potential under no-till management
Z. Tan, R. Lal, S. Liu
2006, Soil Science (171) 950-959
Conservation management of croplands at the plot scale has demonstrated a great potential to mitigate the greenhouse effect through sequestration of atmospheric carbon (C) into soil. This study estimated the potential of soil to sequester C through the conversion of croplands from conventional tillage (CT) to no-till (NT) in the...
Evaluation of aerial survey methods for Dall's sheep
Mark S. Udevitz, Brad S. Shults, Layne G. Adams, Christopher Kleckner
2006, Wildlife Society Bulletin (34) 732-740
Most Dall's sheep (Ovis dalli dalli) population-monitoring efforts use intensive aerial surveys with no attempt to estimate variance or adjust for potential sightability bias. We used radiocollared sheep to assess factors that could affect sightability of Dall's sheep in standard fixed-wing and helicopter surveys and to evaluate feasibility of methods...
Recorded earthquake responses from the integrated seismic monitoring network of the Atwood Building, Anchorage, Alaska
M. Çelebi
2006, Earthquake Spectra (22) 847-864
An integrated seismic monitoring system with a total of 53 channels of accelerometers is now operating in and at the nearby free-field site of the 20-story steel-framed Atwood Building in highly seismic Anchorage, Alaska. The building has a single-story basement and a reinforced concrete foundation without piles. The monitoring system...
Addition of simultaneous heat and solute transport and variable fluid viscosity to SEAWAT
D. Thorne, C.D. Langevin, M.C. Sukop
2006, Computers & Geosciences (32) 1758-1768
SEAWAT is a finite-difference computer code designed to simulate coupled variable-density ground water flow and solute transport. This paper describes a new version of SEAWAT that adds the ability to simultaneously model energy and solute transport. This is necessary for simulating the transport of heat and salinity in coastal aquifers...
Hyporheic exchange and fulvic acid redox reactions in an alpine stream/wetland ecosystem, Colorado front range
Matthew P. Miller, Diane M. McKnight, R.M. Cory, Mark W. Williams, Robert L. Runkel
2006, Environmental Science & Technology (40) 5943-5949
The influence of hyporheic zone interactions on the redox state of fulvic acids and other redox active species was investigated in an alpine stream and adjacent wetland, which is a more reducing environment. A tracer injection experiment using bromide (Br-) was conducted in the stream system. Simulations...
Mercury in soils, lakes, and fish in Voyageurs National Park (Minnesota): Importance of atmospheric deposition and ecosystem factors
J.G. Wiener, B.C. Knights, M.B. Sandheinrich, Jeffrey D. Jeremiason, M. E. Brigham, D.R. Engstrom, L. G. Woodruff, W.F. Cannon, S.J. Balogh
2006, Environmental Science & Technology (40) 6261-6268
Concentrations of methylmercury in game fish from many interior lakes in Voyageurs National Park (MN, U.S.A.) substantially exceed criteria for the protection of human health. We assessed the importance of atmospheric and geologic sources of mercury to interior lakes and watersheds within the Park and identified ecosystem factors associated with...
Three-dimensional compressional wavespeed model, earthquake relocations, and focal mechanisms for the Parkfield, California, region
C. Thurber, H. Zhang, F. Waldhauser, J. Hardebeck, A. Michael, D. Eberhart-Phillips
2006, Bulletin of the Seismological Society of America (96)
We present a new three-dimensional (3D) compressional vvavespeed (V p) model for the Parkfield region, taking advantage of the recent seismicity associated with the 2003 San Simeon and 2004 Parkfield earthquake sequences to provide increased model resolution compared to the work of Eberhart-Phillips and Michael (1993) (EPM93). Taking the EPM93...
