Sources and transformations of nitrate from streams draining varying land uses: Evidence from dual isotope analysis
Douglas A. Burns, E.W. Boyer, E.M. Elliott, C. Kendall
2009, Journal of Environmental Quality (38) 1149-1159
Knowledge of key sources and biogeochemical processes that affect the transport of nitrate (NO3-) in streams can inform watershed management strategies for controlling downstream eutrophication. We applied dual isotope analysis of NO3- to determine the dominant sources and processes that affect NO3- concentrations in six stream/river watersheds of different land...
Research on the middle-of-receiver-spread assumption of the MASW method
Y. Luo, J. Xia, J. Liu, Y. Xu, Q. Liu
2009, Soil Dynamics and Earthquake Engineering (29) 71-79
The multichannel analysis of surface wave (MASW) method has been effectively used to determine near-surface shear- (S-) wave velocity. Estimating the S-wave velocity profile from Rayleigh-wave measurements is straightforward. A three-step process is required to obtain S-wave velocity profiles: acquisition of a multiple number of multichannel records along a linear...
Small-footprint, waveform-resolving lidar estimation of submerged and sub-canopy topography in coastal environments
A. Nayegandhi, J. C. Brock, C. W. Wright
2009, International Journal of Remote Sensing (30) 861-878
The experimental advanced airborne research lidar (EAARL) is an airborne lidar instrument designed to map near-shore submerged topography and adjacent land elevations simultaneously. This study evaluated data acquired by the EAARL system in February 2003 and March 2004 along the margins of Tampa Bay, Florida, USA, to map bare-earth elevations...
Hierarchical spatial genetic structure of Common Eiders (Somateria mollissima) breeding along a migratory corridor
Sarah A. Sonsthagen, Sandra L. Talbot, Richard B. Lanctot, Kim T. Scribner, Kevin G. McCracken
2009, The Auk (126) 744-754
Documentation of spatial genetic discordance among breeding populations of Arctic-nesting avian species is important, because anthropogenic change is altering environmental linkages at micro- and macrogeographic scales. We estimated levels of population subdivision within Pacific Common Eiders (Somateria mollissima v-nigrum) breeding on 12 barrier islands in the western...
A calibrated, high-resolution goes satellite solar insolation product for a climatology of Florida evapotranspiration
S.J. Paech, J.R. Mecikalski, D. M. Sumner, C.S. Pathak, Q. Wu, S. Islam, T. Sangoyomi
2009, Journal of the American Water Resources Association (45) 1328-1342
Estimates of incoming solar radiation (insolation) from Geostationary Operational Environmental Satellite observations have been produced for the state of Florida over a 10-year period (1995-2004). These insolation estimates were developed into well-calibrated half-hourly and daily integrated solar insolation fields over the state at 2 km resolution, in addition to a...
Joint inversion for Vp, Vs, and Vp/Vs at SAFOD, Parkfield, California
H. Zhang, C. Thurber, P. Bedrosian
2009, Geochemistry, Geophysics, Geosystems (10)
We refined the three-dimensional (3-D) Vp, Vs and Vp/Vs models around the San Andreas Fault Observatory at Depth (SAFOD) site using a new double-difference (DD) seismic tomography code (tomoDDPS) that simultaneously solves for earthquake locations and all three velocity models using both absolute and differential P, S, and S-P times....
Distribution of melt beneath Mount St Helens and Mount Adams inferred from magnetotelluric data
G.J. Hill, T.G. Caldwell, W. Heise, D.G. Chertkoff, H.M. Bibby, M.K. Burgess, J.P. Cull, Ray A.F. Cas
2009, Nature Geoscience (2) 785-789
Three prominent volcanoes that form part of the Cascade mountain range in Washington State (USA)Mounts StHelens, Adams and Rainierare located on the margins of a mid-crustal zone of high electrical conductivity1,5. Interconnected melt can increase the bulk conductivity of the region containing the melt6,7, which leads us to propose that...
PAHs underfoot: Contaminated dust from coal-tar sealcoated pavement is widespread in the United States
P. C. Van Metre, B.J. Mahler, J.T. Wilson
2009, Environmental Science & Technology (43) 20-25
We reported in 2005 that runoff from parking lots treated with coal-tar-based sealcoat was a major source of polycyclic aromatic hydrocarbons (PAHs) to streams in Austin, Texas. Here we present new data from nine U. S. cities that show nationwide patterns in concentrations of PAHs associated with sealcoat Dust was...
Geochemical characterisation of seepage and drainage water quality from two sulphide mine tailings impoundments: Acid mine drainage versus neutral mine drainage
P.M. Heikkinen, M.L. Raisanen, R.H. Johnson
2009, Mine Water and the Environment (28) 30-49
Seepage water and drainage water geochemistry (pH, EC, O2, redox, alkalinity, dissolved cations and trace metals, major anions, total element concentrations) were studied at two active sulphide mine tailings impoundments in Finland (the Hitura Ni mine and Luikonlahti Cu mine/talc processing plant). The data were used to assess the factors...
Providing public standardized data access function: Lessons learned from accessing USGS Landsat archive
X. Cheng, Y. Bai, L. Di, D. Nebert
2009, Conference Paper, 2009 17th International Conference on Geoinformatics, Geoinformatics 2009
The geospatial community is experiencing a shift from having data locally to sharing them over the Web. However, not all the data accessing systems are built in compliance with open geospatial standards and thus are weak in terms of interoperability. The USGS Landsat data are now available through free electronic...
Basin geometry and cumulative offsets in the Eastern Transverse Ranges, southern California: Implications for transrotational deformation along the San Andreas fault system
V.E. Langenheim, R. E. Powell
2009, Geosphere (5) 1-22
The Eastern Transverse Ranges, adjacent to and southeast of the big left bend of the San Andreas fault, southern California, form a crustal block that has rotated clockwise in response to dextral shear within the San Andreas system. Previous studies have indicated a discrepancy between the measured magnitudes of left...
Phosphorus fractionation in sediment cores collected in 2005 before and after onset of an Aphanizomenon flos-aquae bloom in upper Klamath Lake, OR, USA
N.S. Simon, D. Lynch, T.N. Gallaher
2009, Water, Air, & Soil Pollution (204) 139-153
We tested the hypothesis that there would be measurable losses of phosphorus (P) from surficial sediments of Upper Klamath Lake (UKL), Oregon, if sediments were a source of P during an algal bloom. We compared concentrations of total and forms of P at various depths in cores collected before and...
Development of regression models to estimate flow duration statistics at ungaged streams in Oklahoma using a regional approach
R.A. Esralew
2009, Conference Paper, Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
Multiple-regression analysis was used to develop equations for estimating annual and seasonal flow-duration statistics at ungaged streams in and near Oklahoma that are not substantially affected by human alteration. Ordinary least-squares and left-censored (Tobit) multiple-regression techniques were used to develop equations that relate these statistics, from continuous streamflow data at...
Pore-throat sizes in sandstones, tight sandstones, and shales
Philip H. Nelson
2009, American Association of Petroleum Geologists Bulletin (93) 329-340
Pore-throat sizes in silidclastic rocks form a continuum from the submillimeter to the nanometer scale. That continuum is documented in this article using previously published data on the pore and pore-throat sizes of conventional reservoir rocks, tight-gas sandstones, and shales. For measures of central tendency (mean, mode, median), pore-throat sizes...
A habitat assessment for Florida panther population expansion into central Florida
C.A. Thatcher, F.T. Van Manen, J. D. Clark
2009, Journal of Mammalogy (90) 918-925
One of the goals of the Florida panther (Puma concolor coryi) recovery plan is to expand panther range north of the Caloosahatchee River in central Florida. Our objective was to evaluate the potential of that region to support panthers. We used a geographic information system and the Mahalanobis distance statistic...
Seasonal shifts in shelter and microhabitat use of drymarchon couperi (eastern indigo snake) in Georgia
N.L. Hyslop, R.J. Cooper, J.M. Meyers
2009, Copeia (2009) 458-464
Drymarchon couperi (Eastern Indigo Snake), a threatened species of the southeastern Coastal Plain of the United States, has experienced population declines because of extensive habitat loss and degradation across its range. In Georgia and northern Florida, the species is associated with longleaf pine habitats that support Gopherus polyphemus (Gopher Tortoise)...
Application of a rule-based model to estimate mercury exchange for three background biomes in the continental United States
J.S. Hartman, P.J. Weisberg, R. Pillai, J.A. Ericksen, T. Kuiken, S.E. Lindberg, H. Zhang, J. J. Rytuba, M.S. Gustin
2009, Environmental Science & Technology (43) 4989-4994
Ecosystems that have low mercury (Hg) concentrations (i.e., not enriched or impactedbygeologic or anthropogenic processes) cover most of the terrestrial surface area of the earth yet their role as a net source or sink for atmospheric Hg is uncertain. Here we use empirical data to develop a rule-based model implemented...
Differential energy radiation from two earthquakes in Japan with identical Mw: The Kyushu 1996 and Tottori 2000 earthquakes
G. L. Choy, J. Boatwright
2009, Bulletin of the Seismological Society of America (99) 1815-1826
We examine two closely located earthquakes in Japan that had identical moment magnitudes Mw but significantly different energy magnitudes Me. We use teleseismic data from the Global Seismograph Network and strong-motion data from the National Research Institute for Earth Science and Disaster Prevention's K-Net to analyze the 19 October 1996...
Case study of a full-scale evapotranspiration cover
Patrick E. McGuire, Brian J. Andraski, Ryan E. Archibald
2009, Journal of Geotechnical and Geoenvironmental Engineering (135) 316-332
The design, construction, and performance analyses of a 6.1ha evapotranspiration (ET) landfill cover at the semiarid U.S. Army Fort Carson site, near Colorado Springs, Colo. are presented. Initial water-balance model simulations, using literature reported soil hydraulic data, aided selection of borrow-source soil type(s) that resulted in predictions...
Titan's surface at 2.2-cm wavelength imaged by the Cassini RADAR radiometer: Calibration and first results
M.A. Janssen, R. D. Lorenz, R. West, F. Paganelli, R.M. Lopes, R. L. Kirk, C. Elachi, S. D. Wall, W.T.K. Johnson, Y. Anderson, R.A. Boehmer, P. Callahan, Y. Gim, G.A. Hamilton, K.D. Kelleher, L. Roth, B. Stiles, Gall A. Le
2009, Icarus (200) 222-239
The first comprehensive calibration and mapping of the thermal microwave emission from Titan's surface is reported based on radiometric data obtained at 2.2-cm wavelength by the passive radiometer included in the Cassini Radar instrument. The data reported were accumulated from 69 separate observational segments in Titan passes from Ta (October...
Trace-element record in zircons during exhumation from UHP conditions, North-East Greenland Caledonides
W.C. McClelland, J. A. Gilotti, F.K. Mazdab, J. L. Wooden
2009, European Journal of Mineralogy (21) 1135-1148
Coesite-bearing zircon formed at ultrahigh-pressure (UHP) conditions share general characteristics of eclogite-facies zircon with trace-element signatures characterized by depleted heavy rare earth elements (HREE), lack of an Eu anomaly, and low Th/ U ratios. Trace-element signatures of zircons from the Caledonian UHP terrane in North-East Greenland were used to examine...
Potential habitat distribution for the freshwater diatom Didymosphenia geminata in the continental US
S. Kumar, S. A. Spaulding, T.J. Stohlgren, K.A. Hermann, T.S. Schmidt, L.L. Bahls
2009, Frontiers in Ecology and the Environment (7) 415-420
The diatom Didymosphenia geminata is a single-celled alga found in lakes, streams, and rivers. Nuisance blooms of D geminata affect the diversity, abundance, and productivity of other aquatic organisms. Because D geminata can be transported by humans on waders and other gear, accurate spatial prediction of habitat suitability is urgently...
Movements of brown bullheads in Presque Isle Bay, Lake Erie, Pennsylvania
M. J. Millard, D. R. Smith, E. Obert, J. Grazio, M.L. Bartron, C. Wellington, S. Grise, S. Rafferty, R. Wellington, S. Julian
2009, Journal of Great Lakes Research (35) 613-619
Presque Isle Bay, Lake Erie, was listed as an Area of Concern (AOC) by the International Joint Commission in part because of the high incidence of external tumor in brown bullheads. Verifying the source of the possible contaminant exposure is critical to addressing the AOC designation. We used telemetry tracking...
Genetic differentiation between sympatric and allopatric wintering populations of Snow Geese
E.M. Humphries, J.L. Peters, J.E. Jonsson, Rachel L. Stone, A. D. Afton, K.E. Omland
2009, Wilson Journal of Ornithology (121) 730-738
Blackwater National Wildlife Refuge on the Delmarva Peninsula, Maryland, USA has been the wintering area of a small population of Lesser Snow Geese (Chen caerulescens caerulescens; LSGO) since the 1930s. Snow Geese primarily pair in wintering areas and gene flow could be restricted between this and other LSGO wintering populations....
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...
