The effect of variations in relative spectral response on the retrieval of land surface parameters from multiple sources of remotely sensed imagery
D. J. Meyer, G. Chander
2008, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
Airborne visible infrared imaging spectrometer (AVIRIS) images, collected over Sioux Falls, South Dakota, were used to quantify the effect of spectral response on different surface materials and to develop spectral "figures-of-merit" for spectral responses covering similar, but not identical spectral bands. In this simulation, AVIRIS images...
Implications of postseismic gravity change following the great 2004 Sumatra-Andaman earthquake from the regional harmonic analysis of GRACE intersatellite tracking data
S.-C. Han, J. Sauber, S.B. Luthcke, C. Ji, F. F. Pollitz.
2008, Journal of Geophysical Research B: Solid Earth (113)
We report Gravity Recovery and Climate Experiment (GRACE) satellite observations of coseismic displacements and postseismic transients from the great Sumatra-Andaman Islands (thrust event; Mw ???9.2) earthquake in December 2004. Instead of using global spherical harmonic solutions of monthly gravity fields, we estimated the gravity changes directly using intersatellite range-rate data...
Transport of elemental mercury in the unsaturated zone from a waste disposal site in an arid region
Michelle Ann Walvoord, Brian J. Andraski, D. P. Krabbenhoft, Robert G. Striegl
2008, Applied Geochemistry (23) 572-583
Mercury contained in buried landfill waste may be released via upward emission to the atmosphere or downward leaching to groundwater. Data from the US Geological Survey’s Amargosa Desert Research Site (ADRS) in arid southwestern Nevada reveal another potential pathway of Hg release: long-distance (102 m) lateral migration of elemental Hg (Hg0)...
Molecular and structural characterization of dissolved organic matter from the deep ocean by FTICR-MS, including hydrophilic nitrogenous organic molecules
T. Reemtsma, A. These, M. Linscheid, J. Leenheer, A. Spitzy
2008, Environmental Science & Technology (42) 1430-1437
Dissolved organic matter isolated from the deep Atlantic Ocean and fractionated into a so-called hydrophobic (HPO) fraction and a very hydrophilic (HPI) fraction was analyzed for the first time by Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) to resolve the molecular species, to determine their exact masses, and to...
Developing conceptual hydrogeological model for Potsdam sandstones in southwestern Quebec, Canada
Miroslav Nastev, R. Morin, Rejean Godin, Alain Rouleau
2008, Hydrogeology Journal (16) 373-388
A hydrogeological study was conducted in Potsdam sandstones on the international border between Canada (Quebec) and the USA (New York). Two sandstone formations, arkose and conglomerate (base) and well-cemented quartz arenite (upper), underlie the study area and form the major regional aquifer unit. Glacial till, littoral sand and gravel, and...
Evaluating intercepts from demographic models to understand resource limitation and resource thresholds
M. J. Reynolds-Hogland, J.S. Hogland, M.S. Mitchell
2008, Ecological Modelling (211) 424-432
Understanding resource limitation is critical to effective management and conservation of wild populations, however resource limitation is difficult to quantify partly because resource limitation is a dynamic process. Specifically, a resource that is limiting at one time may become non-limiting at another time, depending upon changes in its availability and...
Mangrove forest distributions and dynamics in Madagascar (1975-2005)
S. Giri, J. Muhlhausen
2008, Sensors (8) 2104-2117
Mangrove forests of Madagascar are declining, albeit at a much slower rate than the global average. The forests are declining due to conversion to other land uses and forest degradation. However, accurate and reliable information on their present distribution and their rates, causes, and consequences of change have not been...
Hydrography and bottom boundary layer dynamics: Influence on inner shelf sediment mobility, Long Bay, North Carolina
L.A. Davis, L.A. Leonard, G.A. Snedden
2008, Southeastern Geology (45) 97-109
This study examined the hydrography and bottom boundary-layer dynamics of two typical storm events affecting coastal North Carolina (NC); a hurricane and the passages of two small consecutive extratropical storms during November 2005. Two upward-looking 1200-kHz Acoustic Doppler Current Profilers (ADCP) were deployed on the inner shelf in northern Long...
Historical and current environmental influences on an endemic great plains fish
John R. Fischer, C.P. Paukert
2008, American Midland Naturalist (159) 364-377
Native fishes of the Great Plains are at risk of decline due to disturbances to physical habitat caused by changes in land and water use, as well as shifts in species assemblages driven by the invasion of introduced species with the loss of natives. We used historical and current fish...
Talc friction in the temperature range 25°–400 °C: relevance for fault-zone weakening
Diane E. Moore, David A. Lockner
2008, Tectonophysics (449) 120-132
Talc is one of the weakest minerals that is associated with fault zones. Triaxial friction experiments conducted on water-saturated talc gouge at room temperature yield values of the coefficient of friction, μ(shear stress, τ/effective normal stress, σ′N) in the range 0.16–0.23, and μ increases with increasing σ′N. Talc gouge heated to temperatures of 100°–400 °C is...
Methane-producing microbial community in a coal bed of the Illinois Basin
D. Strapoc, F.W. Picardal, C. Turich, I. Schaperdoth, J. L. Macalady, J.S. Lipp, Y.-S. Lin, T.F. Ertefai, F. Schubotz, K.-U. Hinrichs, Maria Mastalerz, A. Schimmelmann
2008, Applied and Environmental Microbiology (74) 2424-2432
A series of molecular and geochemical studies were performed to study microbial, coal bed methane formation in the eastern Illinois Basin. Results suggest that organic matter is biodegraded to simple molecules, such as H 2 and CO2, which fuel methanogenesis and the generation of large coal bed methane reserves. Small-subunit...
Relation between flow and temporal variations of nitrate and pesticides in two karst springs in northern Alabama
J.A. Kingsbury
2008, Journal of the American Water Resources Association (44) 478-488
Two karst springs in the Mississippian Carbonate Aquifer of northern Alabama were sampled between March 1999 and March 2001 to characterize the variability in concentration of nitrate, pesticides, selected pesticide degradates, water temperature, and inorganic constituents. Water temperature and inorganic ion data for McGeehee Spring indicate that this spring represents...
Habitat alteration increases invasive fire ant abundance to the detriment of amphibians and reptiles
B.D. Todd, B.B. Rothermel, R.N. Reed, T.M. Luhring, K. Schlatter, L. Trenkamp, J.W. Gibbons
2008, Biological Invasions (10) 539-546
Altered habitats have been suggested to facilitate red imported fire ant (Solenopsis invicta) colonization and dispersal, possibly compounding effects of habitat alteration on native wildlife. In this study, we compared colonization intensity of wood cover boards by S. invicta among four forest management treatments in South Carolina, USA: an unharvested...
Restoring piscivorous fish populations in the Laurentian Great Lakes causes seabird dietary change
C.E. Hebert, D.V.C. Weseloh, A. Idrissi, M.T. Arts, R. O'Gorman, O. T. Gorman, B. Locke, C.P. Madenjian, E.F. Roseman
2008, Ecology (89) 891-897
Ecosystem change often affects the structure of aquatic communities thereby regulating how much and by what pathways energy and critical nutrients flow through food webs. The availability of energy and essential nutrients to top predators such as seabirds that rely on resources near the water's surface will be affected by...
Seasonal changes in submarine groundwater discharge to coastal salt ponds estimated using 226Ra and 228Ra as tracers
A.L. Hougham, S.B. Moran, John P. Masterson, R.P. Kelly
2008, Marine Chemistry (109) 268-278
Submarine groundwater discharge (SGD) to coastal southern Rhode Island was estimated from measurements of the naturally-occurring radioisotopes 226Ra (t1/2 = 1600??y) and 228Ra (t1/2 = 5.75??y). Surface water and porewater samples were collected quarterly in Winnapaug, Quonochontaug, Ninigret, Green Hill, and Pt. Judith-Potter Ponds, as well as nearly monthly in...
New Orleans and Hurricane Katrina. IV: Orleans East Bank (Metro) protected basin
R.B. Seed, R.G. Bea, A. Athanasopoulos-Zekkos, G.P. Boutwell, J.D. Bray, C. Cheung, D. Cobos-Roa, J. Cohen-Waeber, B.D. Collins, L.F. Harder Jr., R. E. Kayen, J.M. Pestana, M.F. Riemer, J.D. Rogers, R. Storesund, X. Vera-Grunauer, Joseph Wartman
2008, Journal of Geotechnical and Geoenvironmental Engineering (134) 762-779
This paper addresses damage caused by Hurricane Katrina to the main Orleans East Bank protected basin. This basin represented the heart of New Orleans, and contained the main downtown area, the historic French Quarter, the Garden District, and the sprawling Lakefront and Canal Districts. Nearly half of the loss of...
Temporal variation in the arthropod community of desert riparian habitats with varying amounts of saltcedar (Tamarix ramosissima)
S.L. Durst, T.C. Theimer, E. H. Paxton, M. K. Sogge
2008, Journal of Arid Environments (72) 1644-1653
We used Malaise traps to examine the aerial arthropod community in riparian habitats dominated by native willow, exotic saltcedar, or a mixture of these two tree species in central Arizona, USA. Over the course of three sampling periods per year in 2003 and 2004, native habitats had significantly greater diversity...
The potential applications of using compost chars for removing the hydrophobic herbicide atrazine from solution
L. Tsui, William R. Roy
2008, Bioresource Technology (99) 5673-5678
One commercial compost sample was pyrolyzed to produce chars as a sorbent for removing the herbicide atrazine from solution. The sorption behavior of compost-based char was compared with that of an activated carbon derived from corn stillage. When compost was pyrolyzed, the char yield was greater than 45% when heated...
Assessment of exposure risk of polychlorinated biphenyls to interior least terns (Sterna antillarum)
B.C. Sanchez, C.A. Caldwell
2008, Environmental Toxicology and Chemistry (27) 617-622
Risk of polychlorinated biphenyl (PCB) exposure and effects were assessed for a colony of federally endangered interior least terns (Sterna antillarum) nesting on the Bitter Lake National Wildlife Refuge (NM, USA). The colony feeds from an area on the Refuge (Hunter Marsh/Oxbow Complex) wherein fish with elevated concentrations of total...
An evaluation of the mobility of pathogen indicators, Escherichia coli and bacteriophage MS-2, in a highly weathered tropical soil under unsaturated conditions
T.-P. Wong, M. Byappanahalli, B. Yoneyama, C. Ray
2008, Journal of Water and Health (6) 131-140
Laboratory column experiments were conducted to study the effects of anionic polyacrylamide (PAM) polymer and surfactant linear alkylbenzene sulfonate (LAS) on the movement of Escherichia coli and the FRNA phage MS-2. The study was designed to evaluate if PAM or PAM + LAS would enhance the mobility of human pathogens...
Mesozoic (Upper Jurassic-Lower Cretaceous) deep gas reservoir play, central and eastern Gulf coastal plain
E. A. Mancini, P. Li, D.A. Goddard, V.O. Ramirez, S.C. Talukdar
2008, American Association of Petroleum Geologists Bulletin (92) 283-308
The Mesozoic (Upper Jurassic-Lower Cretaceous) deeply buried gas reservoir play in the central and eastern Gulf coastal plain of the United States has high potential for significant gas resources. Sequence-stratigraphic study, petroleum system analysis, and resource assessment were used to characterize this developing play and to identify areas in the...
New global hydrography derived from spaceborne elevation data
B. Lehner, K.L. Verdin, A. Jarvis
2008, Eos, Transactions, American Geophysical Union (89) 93-94
To study the Earth system and to better understand the implications of global environmental change, there is a growing need for large-scale hydrographic data sets that serve as prerequisites in a variety of analyses and applications, ranging from regional watershed and freshwater conservation planning to global hydrological, climate, biogeochemical, and...
Monte Carlo method for determining earthquake recurrence parameters from short paleoseismic catalogs: Example calculations for California
T. Parsons
2008, Journal of Geophysical Research B: Solid Earth (113)
Paleoearthquake observations often lack enough events at a given site to directly define a probability density function (PDF) for earthquake recurrence. Sites with fewer than 10-15 intervals do not provide enough information to reliably determine the shape of the PDF using standard maximum-likelihood techniques (e.g., Ellsworth et al., 1999). In...
Stream denitrification across biomes and its response to anthropogenic nitrate loading
P. J. Mulholland, A. M. Helton, G. C. Poole, R. O. Hall Jr., S. K. Hamilton, B. J. Peterson, J. L. Tank, L. R. Ashkenas, L. W. Cooper, Clifford N. Dahm, W. K. Dodds, S.E.G. Findlay, S.V. Gregory, N. B. Grimm, S. L. Johnson, W. H. McDowell, J.L. Meyer, H. M. Valett, J.R. Webster, C. P. Arango, J. J. Beaulieu, M. J. Bernot, A. J. Burgin, C. L. Crenshaw, L. T. Johnson, B.R. Niederlehner, J. M. O’Brien, J. D. Potter, R.W. Sheibley, D. J. Sobota, S. M. Thomas
2008, Nature (452) 202-205
Anthropogenic addition of bioavailable nitrogen to the biosphere is increasing and terrestrial ecosystems are becoming increasingly nitrogen-saturated, causing more bioavailable nitrogen to enter groundwater and surface waters. Large-scale nitrogen budgets show that an average of about 20-25 per cent of the nitrogen added to the biosphere is exported from rivers...
New databases reveal 200 years of change on the Mississippi River system
J. Remo, N. Pinter, B. Ickes, R. Heine
2008, Eos, Transactions, American Geophysical Union (89) 134-135
[No abstract available]...
