Elevated naturally occurring arsenic in a semiarid oxidizing system, Southern High Plains aquifer, Texas, USA
Bridget R. Scanlon, J.-P. Nicot, R.C. Reedy, D. Kurtzman, A. Mukherjee, D. Kirk Nordstrom
2009, Applied Geochemistry (24) 2061-2071
High groundwater As concentrations in oxidizing systems are generally associated with As adsorption onto hydrous metal (Al, Fe or Mn) oxides and mobilization with increased pH. The objective of this study was to evaluate the distribution, sources and mobilization mechanisms of As in the Southern High Plains (SHP) aquifer, Texas,...
On constraining pilot point calibration with regularization in PEST
M.N. Fienen, C.T. Muffels, R. J. Hunt
2009, Ground Water (47) 835-844
Ground water model calibration has made great advances in recent years with practical tools such as PEST being instrumental for making the latest techniques available to practitioners. As models and calibration tools get more sophisticated, however, the power of these tools can be misapplied, resulting in poor parameter estimates and/or...
Compositions of modern dust and surface sediments in the Desert Southwest, United States
M.C. Reheis, J. R. Budahn, P. J. Lamothe, R. L. Reynolds
2009, Journal of Geophysical Research F: Earth Surface (114)
Modern dusts across southwestern United States deserts are compositionally similar to dust-rich Av soil horizons (depths of 0-0.5 cm and 1-4 cm at 35 sites) for common crustal elements but distinctly different for some trace elements. Chemical compositions and magnetic properties of the soil samples are similar among sites relative...
Diurnal stream habitat use of juvenile Atlantic salmon, brown trout and rainbow trout in winter
J. H. Johnson, K.A. Douglass
2009, Fisheries Management and Ecology (16) 352-359
The diurnal winter habitat of three species of juvenile salmonids was examined in a tributary of Skaneateles Lake, NY to compare habitat differences among species and to determine if species/age classes were selecting specific habitats. A total of 792 observations were made on the depth, velocity, substrate and cover (amount...
Quantifying uncertainty in discharge measurements: A new approach
J.E. Kiang, T.A. Cohn, R.R. Mason
2009, Conference Paper, Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
The accuracy of discharge measurements using velocity meters and the velocity-area method is typically assessed based on empirical studies that may not correspond to conditions encountered in practice. In this paper, a statistical approach for assessing uncertainty based on interpolated variance estimation (IVE) is introduced. The IVE method quantifies all...
Mapping Curie temperature depth in the western United States with a fractal model for crustal magnetization
C. Bouligand, J.M.G. Glen, R.J. Blakely
2009, Journal of Geophysical Research B: Solid Earth (114)
We have revisited the problem of mapping depth to the Curie temperature isotherm from magnetic anomalies in an attempt to provide a measure of crustal temperatures in the western United States. Such methods are based on the estimation of the depth to the bottom of magnetic sources, which is assumed...
Genetic susceptibility to chronic wasting disease in free-ranging white-tailed deer: complement component C1q and Prnp polymorphisms
Julie A. Blanchong, Dennis M. Heisey, Kim T. Scribner, Scot V. Libants, Chad Johnson, Judd M. Aiken, Julia A. Langenberg, Michael D. Samuel
2009, Infection, Genetics and Evolution (9) 1329-1335
The genetic basis of susceptibility to chronic wasting disease (CWD) in free-ranging cervids is of great interest. Association studies of disease susceptibility in free-ranging populations, however, face considerable challenges including: the need for large sample sizes when disease is rare, animals of unknown pedigree create a risk of spurious results...
Chapter 3 - Phenomenology of tsunamis: Statistical properties from generation to runup
Eric L. Geist
2009, Advances in Geophysics (51) 107-169
Observations related to tsunami generation, propagation, and runup are reviewed and described in a phenomenological framework. In the three coastal regimes considered (near-field broadside, near-field oblique, and far field), the observed maximum wave amplitude is associated with different parts of the tsunami wavefield. The maximum amplitude in the near-field broadside...
Stratigraphic controls on saltwater intrusion in the Dominguez Gap area of coastal Los Angeles
Brian D. Edwards, Kenneth D. Ehman, Daniel J. Ponti, Eric G. Reichard, John Tinsley, Robert J. Rosenbauer, Michael T. Land
2009, Special Paper of the Geological Society of America 375-395
The Los Angeles Basin is a densely populated coastal area that significantly depends on groundwater. A part of this groundwater supply is at risk from saltwater intrusion—the impetus for this study. High-resolution seismic-reflection data collected from the Los Angeles–Long Beach Harbor Complex have been combined with borehole geophysical and descriptive...
New Permian durhaminid cerioid corals from east-central California
C.H. Stevens, P. Stone
2009, Journal of Paleontology (83) 946-953
Permian colonial corals from Artinskian to Kungurian strata in the Conglomerate Mesa area, Inyo Mountains, east-central California, include five new species, one of which is assigned to a new genus. The new taxa are: Malpaisia maceyi n. gen. and n. sp., Pararachnastraea bellula n. sp., P. delicata n. sp., P....
Social, political, and institutional setting: Water management problems of the Rio Grande
A. J. Douglas
2009, Journal of Water Resources Planning and Management (135) 493-501
This paper discusses various water management issues facing federal, state, and local agencies charged with managing the water resources of the Rio Grande River Basin and its major tributaries. The Rio Grande - 3,058 km (=1,900 mi) long - is the fourth longest river in the United States. The river's...
Standardizing electrofishing power for boat electrofishing: chapter 14
L.E. Miranda
Scott A. Bonar, Wayne A. Hubert, David W. Willis, editor(s)
2009, Book chapter, Standard methods for sampling North American freshwater fishes
Standardization of electrofishing can help reduced the variability of survey data and potentially reduce injur of fish. Without standardization, differences among collections can be partially attributed to disparities in electrofishing methodology, intensity of the electrical field, and size of the electrical field rather than to disparities in fish abundance, population...
Composition and variation of noise recorded at the Yellowknife Seismic Array, 1991-2007
K.D. Koper, B. De Foy, H. Benz
2009, Journal of Geophysical Research B: Solid Earth (114)
We analyze seismic noise recorded on the 18 short-period, vertical component seismometers of the Yellowknife Seismic Array (YKA). YKA has an aperture of 23 km and is sited on cratonic lithosphere in an area with low cultural noise. These properties make it ideal for studying natural seismic noise at periods...
Angler awareness of aquatic nuisance species and potential transport mechanisms
K.K. Gates, C.S. Guy, A.V. Zale, T.B. Horton
2009, Fisheries Management and Ecology (16) 448-456
The role anglers play in transporting aquatic nuisance species (ANS) is important in managing infestations and preventing introductions. The objectives of this study were to: (1) quantify angler movement patterns in southwestern Montana, ANS awareness and equipment cleaning practices; and (2) quantify the amount of soil transported on boots and...
Bioenergetic model estimates of interannual and spatial patterns in consumption demand and growth potential of juvenile pink salmon (Oncorhynchus gorbuscha) in the Gulf of Alaska
J.H. Moss, D.A. Beauchamp, A.D. Cross, E.V. Farley, J.M. Murphy, J.H. Helle, R.V. Walker, K.W. Myers
2009, Deep-Sea Research Part II: Topical Studies in Oceanography (56) 2553-2559
A bioenergetic model of juvenile pink salmon (Oncorhynchus gorbuscha) was used to estimate daily prey consumption and growth potential of four ocean habitats in the Gulf of Alaska during 2001 and 2002. Growth potential was not significantly higher in 2002 than in 2001 at an alpha level of 0.05 (P=0.073)....
Incised channel fills containing conifers indicate that seasonally dry vegetation dominated Pennsylvanian tropical lowlands
H. J. Falcon-Lang, W.J. Nelson, S. Elrick, C.V. Looy, P.R. Ames, William A. DiMichele
2009, Geology (37) 923-926
The idea that the Pennsylvanian tropical lowlands were temporally dominated by rainforest (i.e., the Coal Forest) is deeply ingrained in the literature. Here we challenge two centuries of research by suggesting that this concept is based on a taphonomic artifact, and that seasonally dry vegetation dominated instead. This controversial finding...
Variation in movement patterns of red drum (Sciaenops ocellatus) inferred from conventional tagging and ultrasonic telemetry
N.M. Bacheler, L.M. Paramore, S. M. Burdick, J.A. Buckel, J.E. Hightower
2009, Fishery Bulletin (107) 405-419
We used 25 years of conventional tagging data (n=6173 recoveries) and 3 years of ultrasonic telemetry data (n=105 transmitters deployed) to examine movement rates and directional preferences of four age classes of red drum (Sciaenops ocellatus) in estuarine and coastal waters of North Carolina. Movement rates of conventionally tagged red...
Site characterization for urban seismic hazards in lower Manhattan, New York City, from microtremor array analysis
W. J. Stephenson, S. Hartzell, A.D. Frankel, M. Asten, D. L. Carver, W.Y. Kim
2009, Geophysical Research Letters (36)
We characterize the shear-wave velocity (Vs) of soil deposits in lower Manhattan at six sites using the SPAC and HVSR microtremor methods. The soil Vs ranges from 140 m/s to 300 m/s over bedrock. We believe that bedrock depth is constrained to ±15% with these microtremor data, but an accurate...
Distribution limits of Batrachochytrium dendrobatidis: a case study in the Rocky Mountains, USA
Blake R. Hossack, Erin L. Muths, Chauncey W. Anderson, Julie D. Kirshtein, P. Stephen Corn
2009, Journal of Wildlife Diseases (45) 1198-1202
Knowledge of the environmental constraints on a pathogen is critical to predicting its dynamics and effects on populations. Batrachochytrium dendrobatidis (Bd), an aquatic fungus that has been linked with widespread amphibian declines, is ubiquitous in the Rocky Mountains. As part of assessing the distribution limits of Bd in our study...
Diets of aquatic birds reflect changes in the Lake Huron ecosystem
Craig E. Hebert, D.V. Chip Weseloh, Abode Idrissi, Michael T. Arts, Edward F. Roseman
2009, Aquatic Ecosystem Health & Management (12) 37-44
Human activities have affected the Lake Huron ecosystem, in part, through alterations in the structure and function of its food webs. Insights into the nature of food web change and its ecological ramifications can be obtained through the monitoring of high trophic level predators such as aquatic birds. Often, food...
TandEM: Titan and Enceladus mission
A. Coustenis, S.K. Atreya, T. Balint, R. H. Brown, M.K. Dougherty, F. Ferri, M. Fulchignoni, D. Gautier, R.A. Gowen, C.A. Griffith, L.I. Gurvits, R. Jaumann, Y. Langevin, M.R. Leese, J. I. Lunine, C.P. McKay, X. Moussas, I. Muller-Wodarg, F. Neubauer, T.C. Owen, F. Raulin, E.C. Sittler, F. Sohl, Christophe Sotin, G. Tobie, T. Tokano, E. P. Turtle, J.-E. Wahlund, J.H. Waite, K. H. Baines, J. E. Blamont, A.J. Coates, I. Dandouras, T. Krimigis, E. Lellouch, R. D. Lorenz, A. Morse, C.C. Porco, M. Hirtzig, J. Saur, T. Spilker, J.C. Zarnecki, E. Choi, N. Achilleos, R. Amils, P. Annan, D.H. Atkinson, Y. Benilan, C. Bertucci, B. Bezard, G.L. Bjoraker, M. Blanc, L. Boireau, J. Bouman, M. Cabane, M.T. Capria, E. Chassefiere, P. Coll, M. Combes, J.F. Cooper, A. Coradini, F. Crary, T. Cravens, I.A. Daglis, E. de Angelis, C. De Bergh, I. de Pater, C. Dunford, G. Durry, O. Dutuit, D. Fairbrother, F.M. Flasar, A.D. Fortes, R. Frampton, M. Fujimoto, M. Galand, O. Grasset, M. Grott, T. Haltigin, A. Herique, F. Hersant, H. Hussmann, W. Ip, R. Johnson, E. Kallio, S. Kempf, M. Knapmeyer, W. Kofman, R. Koop, T. Kostiuk, N. Krupp, M. Kuppers, H. Lammer, L.-M. Lara, P. Lavvas, Stéphane Le Mouélic, S. Lebonnois, S. Ledvina, Ji Li, T.A. Livengood, R.M. Lopes, J. #NAME? Lopez-Moreno, D. Luz, P.R. Mahaffy, U. Mall, J. Martinez-Frias, B. Marty, T. McCord, C.M. Salvan, A. Milillo, D.G. Mitchell, R. Modolo, O. Mousis, M. Nakamura, Catherine D. Neish, C.A. Nixon, D.N. Mvondo, G. Orton, M. Paetzold, J. Pitman, S. Pogrebenko, W. Pollard, O. Prieto-Ballesteros, P. Rannou, K. Reh, L. Richter, F.T. Robb, R. Rodrigo, S. Rodriguez, P. Romani, M.R. Bermejo, E.T. Sarris, P. Schenk, B. Schmitt, N. Schmitz, D. Schulze-Makuch, K. Schwingenschuh, A. Selig, B. Sicardy, L. Soderblom, L.J. Spilker, D. Stam, A. Steele, K. Stephan, D.F. Strobel, K. Szego, Szopa
2009, Experimental Astronomy (23) 893-946
TandEM was proposed as an L-class (large) mission in response to ESA’s Cosmic Vision 2015–2025 Call, and accepted for further studies, with the goal of exploring Titan and Enceladus. The mission concept is to perform in situ investigations of two worlds tied together by location and properties, whose remarkable natures...
Emsian (late Early Devonian) sponges from west-central and south-central Alaska
J.K. Rigby, R. B. Blodgett, N.K. Anderson
2009, Journal of Paleontology (83) 293-298
Relatively common specimens of the hypercalcified agelasiid sponge Hormospongia labyrinthica Rigby and Blodgett, 1983 and specimens of associated species of Hormospongia have been previously reported from Emsian and Eifelian stratigraphic units at several localities in south-central and southeastern Alaska (Rigby and Blodgett, 1983). Those sponges were first described from the...
Nature versus nurture: functional assessment of restoration effects on wetland services using Nuclear Magnetic Resonance Spectroscopy
P.V. Sundareshwar, C.J. Richardson, R.A. Gleason, P.J. Pellechia, S. Honomichl
2009, Geophysical Research Letters (36)
Land-use change has altered the ability of wetlands to provide vital services such as nutrient retention. While compensatory practices attempt to restore degraded wetlands and their functions, it is difficult to evaluate the recovery of soil biogeochemical functions that are critical for restoration of ecosystem services. Using solution 31P Nuclear...
The SCEC/USGS dynamic earthquake rupture code verification exercise
R.A. Harris, M. Barall, R. Archuleta, E. Dunham, Brad T. Aagaard, J.-P. Ampuero, H. Bhat, Victor M. Cruz-Atienza, L. Dalguer, P. Dawson, S. Day, B. Duan, G. Ely, Y. Kaneko, Y. Kase, N. Lapusta, Yajing Liu, S. Ma, D. Oglesby, K. Olsen, A. Pitarka, S. Song, E. Templeton
2009, Seismological Research Letters (80) 119-126
Numerical simulations of earthquake rupture dynamics are now common, yet it has been difficult to test the validity of these simulations because there have been few field observations and no analytic solutions with which to compare the results. This paper describes the Southern California Earthquake Center/U.S. Geological Survey (SCEC/USGS)...
A robust, multisite Holocene history of drift ice off northern Iceland: Implications for North Atlantic climate
John T. Andrews, D. Darby, D. Eberle, A. E. Jennings, M. Moros, A. Ogilvie
2009, Holocene (19) 71-77
An important indicator of Holocene climate change is provided by evidence for variations in the extent of drift ice. A proxy for drift ice in Iceland waters is provided by the presence of quartz. Quantitative x-ray diffraction analysis of the < 2 mm sediment fraction was undertaken on 16 cores...
