Diagenetic fate of organic contaminants on the Palos Verdes Shelf, California
R.P. Eganhouse, J. Pontolillo, T.J. Leiker
2000, Marine Chemistry (70) 289-315
Municipal wastes discharged through deepwater submarine outfalls since 1937 have contaminated sediments of the Palos Verdes Shelf. A site approximately 6–8 km downcurrent from the outfall system was chosen for a study of the diagenetic fate of organic contaminants in the waste-impacted sediments. Concentrations of three classes of hydrophobic organic...
Gap analysis: Concepts, methods, and recent results
M.D. Jennings
2000, Landscape Ecology (15) 5-20
Rapid progress is being made in the conceptual, technical, and organizational requirements for generating synoptic multi-scale views of the earth's surface and its biological content. Using the spatially comprehensive data that are now available, researchers, land managers, and land-use planners can, for the first time, quantitatively place landscape units -...
The United States Board on Geographic Names: Standardization or regulation?
R.L. Payne
2000, Names (48) 177-192
The United States Board on Geographic Names was created in 1890 to standardize the use of geographic names on federal maps and documents, and was established in its present form in 1947 by public law. The Board is responsible for geographic name usage and application throughout the federal government and...
Chapter 4. Predicting post-fire erosion and sedimentation risk on a landscape scale
L. H. MacDonald, R. Sampson, D. Brady, L. Juarros, Deborah A. Martin
2000, Journal of Sustainable Forestry (11) 57-87
Historic fire suppression efforts have increased the likelihood of large wildfires in much of the western U.S. Post-fire soil erosion and sedimentation risks are important concerns to resource managers. In this paper we develop and apply procedures to predict post-fire erosion and sedimentation risks on a pixel-, catchment-, and landscape-scale...
Molecular analysis of population genetic structure and recolonization of rainbow trout following the Cantara spill
J.L. Nielsen, Erika L. Heine, Christina A. Gan, Monique C. Fountain
2000, California Fish and Game (86) 21-40
Mitochondrial DNA (mtDNA) sequence and allelic frequency data for 12 microsatellite loci were used to analyze population genetic structure and recolonization by rainbow trout, Oncorhynchus mykiss, following the 1991 Cantara spill on the upper Sacramento River, California. Genetic analyses were performed on 1,016 wild rainbow trout collected between...
A modified ground-motion attenuation relationship for southern California that accounts for detailed site classification and a basin-depth effect
E. H. Field
2000, Bulletin of the Seismological Society of America (90) S209-S221
The attenuation relationship presented by Boore et al. (1997) has been evaluated and customized with respect to southern California strong-motion data (for peak ground acceleration (PGA) and 0.3-, 1.0-, and 3.0-sec period spectral acceleration). This study was motivated by the recent availability of a new site-classification map by Wills et...
Anisotropy of magnetic susceptibility as a tool for recognizing core deformation: Reevaluation of the paleomagnetic record of Pleistocene sediments from drill hole OL-92, Owens Lake, California
Joseph Rosenbaum, Richard L. Reynolds, Joseph Smoot, Robert Meyer
2000, Earth and Planetary Science Letters (178) 415-424
At Owens Lake, California, paleomagnetic data document the Matuyama/Brunhes polarity boundary near the bottom of a 323-m core (OL-92) and display numerous directional fluctuations throughout the Brunhes chron. Many of the intervals of high directional dispersion were previously interpreted to record magnetic excursions. For the upper ~120 m, these interpretations...
Assessing sorbent injection mercury control effectiveness in flue gas streams
T.R. Carey, C. F. Richardson, R. Chang, F.B. Meserole, M. Rostam-Abadi, S. Chen
2000, Environmental Progress (19) 167-174
One promising approach for removing mercury from coal-fired, utility flue gas involves the direct injection of mercury sorbents. Although this method has been effective at removing mercury in municipal waste incinerators, tests conducted to date on utility coal-fired boilers show that mercury removal is much more difficult in utility flue...
Formation and distribution of coal balls in the Herrin Coal (Pennsylvanian), Franklin County, Illinois Basin, USA
P.J. DeMaris
2000, Journal of the Geological Society (157) 221-228
Large areas of concentrated coal balls (permineralized peat) up to 4 m thick obstructed longwall mining in the Herrin Coal at the Old Ben No. 24 mine. The largest coal‐ball area mapped contained >1500 m3; several areas contained >400 m3 of coal balls. In‐mine mapping established that there were two types of roof (freshwater...
Hydrological responses to dynamically and statistically downscaled climate model output
R.L. Wilby, L.E. Hay, W.J. Gutowski Jr., R.W. Arritt, E.S. Takle, Z. Pan, G.H. Leavesley, M.P. Clark
2000, Geophysical Research Letters (27) 1199-1202
Daily rainfall and surface temperature series were simulated for the Animas River basin, Colorado using dynamically and statistically downscaled output from the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) re-analysis. A distributed hydrological model was then applied to the downscaled data. Relative to raw NCEP output, downscaled...
An updated Holocene sea-level curve for the Delaware coast
D.L. Nikitina, J.E. Pizzuto, R.A. Schwimmer, K.W. Ramsey
2000, Marine Geology (171) 7-20
We present an updated Holocene sea-level curve for the Delaware coast based on new calibrations of 16 previously published radiocarbon dates (Kraft, 1976; Belknap and Kraft, 1977) and 22 new radiocarbon dates of basal peat deposits. A review of published and unpublished 137Cs and 210Pb analyses, and tide gauge data...
Seismic anisotropy of the shallow crust at the Juan de Fuca Ridge
J. Almendros, A.H. Barclay, W.S.D. Wilcock, G.M. Purdy
2000, Geophysical Research Letters (27) 3109-3112
Microearthquake data recorded on four ocean bottom seismometers are used to study shear-wave splitting on the Endeavour Segment of the Juan de Fuca Ridge. The covariance matrix decomposition method is used to determine the sensor orientation from explosive shot data and to estimate the anisotropy parameters for 238 earthquake records....
Discrepancy between earthquake rates implied by historic earthquakes and a consensus geologic source model for California
M.D. Petersen, C.H. Cramer, M.S. Reichle, A.D. Frankel, Thomas C. Hanks
2000, Bulletin of the Seismological Society of America (90) 1117-1132
We examine the difference between expected earthquake rates inferred from the historical earthquake catalog and the geologic data that was used to develop the consensus seismic source characterization for the state of California [California Department of Conservation, Division of Mines and Geology (CDMG) and U.S. Geological Survey (USGS) Petersen et...
Uncertain nest fates in songbird studies and variation in Mayfield estimation
J.C. Manolis, D. E. Andersen, F.J. Cuthbert
2000, The Auk (117) 615-626
Determining whether nesting attempts are successful can be difficult. Yet, current protocols for estimating nesting success do not address how uncertain nest fates should be handled. We examined the problem of nest-fate uncertainty as it relates to Mayfield estimation of nesting success and in analyses of factors that influence success....
Schaben field, Kansas: Improving performance in a Mississippian shallow-shelf carbonate
Scott L. Montgomery, E. K. Franseen, S. Bhattacharya, P. Gerlach, A. Byrnes, W. Guy, T.R. Carr
2000, American Association of Petroleum Geologists Bulletin (84) 1069-1086
Schaben field (Kansas), located along the northeastern shelf of the Hugoton embayment, produces from Mississippian carbonates in erosional highs immediately beneath a regional unconformity. Production comes from depths of around 4400 ft (1342 m) in partially dolomitized shelf deposits. A detailed reservoir characterization/simulation study, recently performed as part of a...
Studies of volcanoes of Alaska by satellite radar interferometry
Z. Lu, C. Wicks Jr., D. Dzurisin, W. Thatcher, J. Power
Sawaya-Lacoste H., editor(s)
2000, Conference Paper
Interferometric synthetic aperture radar (InSAR) has provided a new imaging geodesy technique to measure the deformation of volcanoes at tens-of-meter horizontal resolution with centimeter to subcentimeter vertical precision. The two-dimensional surface deformation data enables the construction of detailed numerical models allowing the study of magmatic and tectonic processes beneath volcanoes....
Estimating formation properties from early-time oscillatory water levels in a pumped well
A.M. Shapiro, D.S. Oki
2000, Journal of Hydrology (236) 91-108
Hydrologists often attempt to estimate formation properties from aquifer tests for which only the hydraulic responses in a pumped well are available. Borehole storage, turbulent head losses, and borehole skin, however, can mask the hydraulic behavior of the formation inferred from the water level in the pumped well. Also, in...
The relationship of nitrate concentrations in streams to row crop land use in Iowa
K. E. Schilling, R.D. Libra
2000, Journal of Environmental Quality (29) 1846-1851
The relationship between row crop land use and nitrate N concentrations in surface water was evaluated for 15 Iowa watersheds ranging from 1002 to 2774 km2 and 10 smaller watersheds ranging from 47 to 775 km2 for the period 1996 to 1998. The percentage of land in row crop varied from 24...
The dependence of permeability on effective stress for an injection test in the Higashi-Hachimantai Geothermal Field
M. Nathenson
2000, Geophysical Research Letters (27) 589-592
A simple inverse-power relation for the influence of effective stress on permeability is used to explain the flow behavior during an injection test at the Higashi-Hachimantai geothermal field, Japan. The new analytical expression successfully models data from the experiment involving high-pressure injection and monitoring at an observation well....
Estimating effects of constraints on plant performance with regression quantiles
B.S. Cade, Q. Guo
2000, Oikos (91) 245-254
Rates of change in final summer densities of two desert annuals, Eriogonum abertianum and Haplopappus gracilis, as constrained by their initial winter germination densities were estimated with regression quantiles and compared with mechanistic fits based on a self-thinning rule proposed by Guo et al. (1998); Oikos 83: 237–245). The allometric...
Activity patterns of marbled murrelets in Douglas-fir old-growth forests of the Oregon Coast Range
Patrick G.R. Jodice, Michael W. Collopy
2000, The Condor (102) 275-285
We monitored activity patterns of Marbled Murrelets (Brachyramphus marmoratus) on a near-daily basis using audio-visual surveys during three breeding seasons at five forest stands in the Oregon Coast Range. Three measures of activity were recorded: number of daily detections, number of daily vocalizations, and duration of daily activity. Each...
Exposure of delta smelt to dissolved pesticides in 1998 and 1999
G. Edward Moon, Kathryn Kuivila, Catherine A. Ruhl, David H. Schoellhamer
2000, Interagency Ecological Program Newsletter (13) 27-33
Delta smelt is a threatened species in the San Francisco Bay Estuary. Pesticide toxicity is a possible cause for the need to list this fish (Bennett and Moyle 1996; Moyle and others 1996). Numerous pesticides are transported into the estuary from area rivers (MacCoy and others 1995). However, there are...
Winter survival of adult female harlequin ducks in relation to history of contamination by the Exxon Valdez oil spill
Daniel Esler, Joel A. Schmutz, R. L. Jarvis, D.M. Mulcahy
2000, Journal of Wildlife Management (64) 839-847
Harlequin duck (Histrionicus histrionicus) life-history characteristics make their populations particularly vulnerable to perturbations during nonbreeding periods. The 1989 Exxon Valdez oil spill was a major perturbation to nonbreeding habitats of harlequin ducks in Prince William Sound, Alaska, which resulted in population injury. To assess the status of population recovery from...
Detection of crystalline hematite mineralization on Mars by the Thermal Emission Spectrometer: evidence for near-surface water
P. R. Christensen, J. L. Bandfield, R. N. Clark, K.S. Edgett, V.E. Hamilton, T. Hoefen, H. H. Kieffer, R.O. Kuzmin, M. D. Lane, M. C. Malin, R.V. Morris, J.C. Pearl, R. Pearson, T. L. Roush, S. W. Ruff, M. D. Smith
2000, Journal of Geophysical Research E: Planets (105) 9623-9642
The Thermal Emission Spectrometer (TES) instrument on the Mars Global Surveyor (MGS) mission has discovered a remarkable accumulation of crystalline hematite (α-Fe2O3) that covers an area with very sharp boundaries approximately 350 by 350–750 km in size centered near 2°S latitude between 0° and 5°W longitude (Sinus Meridiani). Crystalline hematite...
Do wolves affect white-tailed buck harvest in northeastern Minnesota?
L. David Mech, Michael E. Nelson
2000, Journal of Wildlife Management (64) 129-136
We used simple linear regression to analyze 8-23 years of data on a wolf (Canis lupus) population and human harvest of white-tailed deer (Odocoileus virginianus) bucks in northeastern Minnesota to determine any effects of wolves on buck harvesting. Over the long term, wolves accounted for at least 14-22% of the...
