Climatic implications of reconstructed early - Mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica
A.G. Krusic, M.L. Prentice, J. M. Licciardi
2009, Annals of Glaciology (50) 31-36
Early-mid Pliocene moraines in the McMurdo Dry Valleys, Antarctica, are more extensive than the present alpine glaciers in this region, indicating substantial climatic differences between the early-mid Pliocene and the present. To quantify this difference in the glacier-climate regime, we estimated the equilibrium-line altitude (ELA) change since the early-mid Pliocene...
Elemental signatures in otoliths of hatchery rainbow trout (Oncorhynchus mykiss): Distinctiveness and utility fo detecting origins and movement
D. K. Gibson-Reinemer, B. M. Johnson, P.J. Martinez, D.L. Winkelman, A.E. Koenig, J.D. Woodhead
2009, Canadian Journal of Fisheries and Aquatic Sciences (66) 513-524
Otolith chemistry in freshwater has considerable potential to reveal patterns of origin and movement, which would benefit traditional fisheries management and provide a valuable tool to curb the spread of invasive and illicitly stocked species. We evaluated the relationship between otolith and water chemistry for five markers (Ba/Ca, Mn/Ca, Sr/...
Biogeochemistry at a wetland sediment-alluvial aquifer interface in a landfill leachate plume
M.M. Lorah, I.M. Cozzarelli, J.K. Böhlke
2009, Journal of Contaminant Hydrology (105) 99-117
The biogeochemistry at the interface between sediments in a seasonally ponded wetland (slough) and an alluvial aquifer contaminated with landfill leachate was investigated to evaluate factors that can effect natural attenuation of landfill leachate contaminants in areas of groundwater/surface-water interaction. The biogeochemistry at the wetland-alluvial aquifer interface differed greatly between...
Interbasin flow in the Great Basin with special reference to the southern Funeral Mountains and the source of Furnace Creek springs, Death Valley, California, U.S.
W.R. Belcher, M. S. Bedinger, J.T. Back, D. S. Sweetkind
2009, Journal of Hydrology (369) 30-43
Interbasin flow in the Great Basin has been established by scientific studies during the past century. While not occurring uniformly between all basins, its occurrence is common and is a function of the hydraulic gradient between basins and hydraulic conductivity of the intervening rocks. The Furnace Creek springs in Death...
Sediment storage and transport in Pancho Rico Valley during and after the Pleistocene-Holocene transition, Coast Ranges of central California (Monterey County)
A.F. Garcia, S. A. Mahan
2009, Earth Surface Processes and Landforms (34) 1136-1150
Factors influencing sediment transport and storage within the 156??6 km2 drainage basin of Pancho Rico Creek (PRC), and sediment transport from the PRC drainage basin to its c. 11000 km2 mainstem drainage (Salinas River) are investigated. Numeric age estimates are determined by optically stimulated luminescence (OSL) dating on quartz grains...
Delayed tree mortality in the Atchafalaya Basin of Southern Louisiana following Hurricane Andrew
B. D. Keeland, L.E. Gorham
2009, Wetlands (29) 101-111
Hurricanes can damage trees in forested wetlands, and the potential for mortality related to these storms exists due to the effects of tree damage over time. In August 1992, Hurricane Andrew passed through the forested wetlands of southern Louisiana with winds in excess of 225 kph. Although more than 78...
Optimized DNA extraction methods for encysted embryos of the endangered fairy shrimp, Branchinecta sandiegonensis
A.N. Steele, M.A. Simovich, D. Pepino, K.M. Schroeder, Amy G. Vandergast, A.J. Bohonak
2009, Conservation Genetics (10) 1777-1781
The San Diego fairy shrimp Branchinecta sandiegonensis is a federally endangered species endemic to vernal pools in southern California, USA. Filling events in these habitats are highly variable, with some pools failing to hold water long enough for reproduction over many successive years. Studies of this species are thus hindered...
Vertical distribution of total carbon, nitrogen and phosphorus in riparian soils of Walnut Creek, southern Iowa
K. E. Schilling, J.A. Palmer, E. Arthur Bettis III, P. Jacobson, R.C. Schultz, T.M. Isenhart
2009, Catena (77) 266-273
Subsurface lithology plays an important role in many riparian zone processes, but few studies have examined how sediment nutrient concentrations vary with depth. In this study, we evaluated concentrations of nutrients (N, C and P) with depth in a riparian zone of the glaciated Midwest. A total of 146 sediment...
Temperature mediated moose survival in Northeastern Minnesota
M.S. Lenarz, M.E. Nelson, M.W. Schrage, A.J. Edwards
2009, Journal of Wildlife Management (73) 503-510
The earth is in the midst of a pronounced warming trend and temperatures in Minnesota, USA, as elsewhere, are projected to increase. Northern Minnesota represents the southern edge to the circumpolar distribution of moose (Alces alces), a species intolerant of heat. Moose increase their metabolic rate to regulate their core...
Use of OSL dating to establish the stratigraphic framework of Quaternary eolian sediments, Anton scarp upper trench, Northeastern Colorado High Plains, USA
S. A. Mahan, D.C. Noe, J.P. McCalpin
2009, Quaternary International (199) 92-103
This paper contains the results of the optically stimulated luminescence (OSL) dating used to establish stratigraphic ages and relationships of eolian sediments in a trench in northeastern Colorado, USA. This trench was located in the upper face of the Anton scarp, a major topographic lineament trending NW-SE for a distance...
Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning
Mark Marvin-DiPasquale, Michelle A. Lutz, Mark E. Brigham, David P. Krabbenhoft, George R. Aiken, William H. Orem, Britt D. Hall
2009, Environmental Science & Technology (43) 2726-2732
Mercury speciation, controls on methylmercury (MeHg) production, and bed sediment−pore water partitioning of total Hg (THg) and MeHg were examined in bed sediment from eight geochemically diverse streams where atmospheric deposition was the predominant Hg input. Across all streams, sediment THg concentrations were best described as a combined function of...
A Holocene record of climate-driven shifts in coastal carbon sequestration
Siddhartha Mitra, A.R. Zimmerman, G.B. Hunsinger, D. Willard, J.C. Dunn
2009, Geophysical Research Letters (36)
A sediment core collected in the mesohaline portion of Chesapeake Bay was found to contain periods of increased delivery of refractory black carbon (BC) and polycyclic aromatic hydrocarbons (PAHs). The BC was most likely produced by biomass combustion during four centennialscale dry periods as indicated by the Palmer Drought Severity...
River restoration strategies in channelized, low-gradient landscapes of West Tennessee, USA
D.P. Smith, T.H. Diehl, L. A. Turrini-Smith, J. Maas-Baldwin, Z. Croyle
2009, Special Paper of the Geological Society of America 215-229
West Tennessee has a complex history of watershed disturbance, including agricultural erosion, channelization, accelerated valley sedimentation, and the removal and reestablishment of beaver. Watershed management has evolved from fl oodplain drainage via pervasive channelization to include local drainage canal maintenance and local river restoration. Many unmaintained canals are undergoing excessive...
Nitrate removal in stream ecosystems measured by 15N addition experiments: Total uptake
R. O. Hall Jr., J. L. Tank, D. J. Sobota, P. J. Mulholland, J. M. O’Brien, W. K. Dodds, J.R. Webster, H. M. Valett, G. C. Poole, B. J. Peterson, J.L. Meyer, W. H. McDowell, S. L. Johnson, S. K. Hamilton, N. B. Grimm, S.V. Gregory, Clifford N. Dahm, L. W. Cooper, L. R. Ashkenas, S. M. Thomas, R.W. Sheibley, J. D. Potter, B.R. Niederlehner, L. T. Johnson, A. M. Helton, C.M. Crenshaw, A. J. Burgin, M. J. Bernot, J. J. Beaulieu, C.P. Arangob
2009, Limnology and Oceanography (54) 653-665
We measured uptake length of 15NO-3 in 72 streams in eight regions across the United States and Puerto Rico to develop quantitative predictive models on controls of NO-3 uptake length. As part of the Lotic Intersite Nitrogen eXperiment II project, we chose nine streams in each region corresponding to natural...
Real-time flood forecasting
C. Lai, T.-K. Tsay, C.-H. Chien, I.-L. Wu
2009, American Scientist (97) 119-125
Researchers at the Hydroinformatic Research and Development Team (HIRDT) of the National Taiwan University undertook a project to create a real time flood forecasting model, with an aim to predict the current in the Tamsui River Basin. The model was designed based on deterministic approach with mathematic modeling of complex...
Food habits of the hoary bat (LASIURUS CINEREUS) during spring migration through new mexico
E.W. Valdez, P.M. Cryan
2009, Southwestern Naturalist (54) 195-200
Hoary bats (Lasiums cinernis) exhibit continental patterns of migration that are unique to bats, but details about their behaviors during migration are lacking. We captured 177 hoary bats in spring and early summer 2002 as individuals migrated through the Sandia Mountains of north-central New Mexico. Our results support earlier observations...
Trout density and health in a stream with variable water temperatures and trace element concentrations: does a cold-water source attract trout to increased metal exposure?
D.D. Harper, A.M. Farag, C. Hogstr, Elizabeth MacConnell
2009, Environmental Toxicology and Chemistry (28) 800-808
A history of hard-rock mining has resulted in elevated concentrations of heavy metals in Prickly Pear Creek (MT. USA). Remediation has improved water quality; however, dissolved zinc and cadmium concentrations still exceed U.S. Environmental Protection Agency water-quality criteria. Physical habitat, salmonid density, fish health, and water quality were assessed, and...
Uptake rate constants and partition coefficients for vapor phase organic chemicals using semipermeable membrane devices (SPMDs)
W.L. Cranor, D.A. Alvarez, J.N. Huckins, J. D. Petty
2009, Atmospheric Environment (43) 3211-3219
To fully utilize semipermeable membrane devices (SPMDs) as passive samplers in air monitoring, data are required to accurately estimate airborne concentrations of environmental contaminants. Limited uptake rate constants (kua) and no SPMD air partitioning coefficient (Ksa) existed for vapor-phase contaminants. This research was conducted to expand the existing body of...
Reflectance spectroscopy of organic compounds: 1. Alkanes
R. N. Clark, J. M. Curchin, T.M. Hoefen, G.A. Swayze
2009, Journal of Geophysical Research E: Planets (114)
Reflectance spectra of the organic compounds comprising the alkane series are presented from the ultraviolet to midinfrared, 0.35 to 15.5 /??m. Alkanes are hydrocarbon molecules containing only single carbon-carbon bonds, and are found naturally on the Earth and in the atmospheres of the giant planets and Saturn's moon, Titan. This...
Ultra-deep oxidation and exotic copper formation at the late pliocene boyongan and bayugo porphyry copper-gold deposits, surigao, philippines: Geology, mineralogy, paleoaltimetry, and their implications for Geologic, physiographic, and tectonic controls
D.P. Braxton, D. R. Cooke, A.M. Ignacio, R. O. Rye, P.J. Waters
2009, Economic Geology (104) 333-349
The Boyongan and Bayugo porphyry copper-gold deposits are part of an emerging belt of intrusion-centered gold-rich deposits in the Surigao district of northeast Mindanao, Philippines. Exhumation and weathering of these Late Pliocene-age deposits has led to the development of the world's deepest known porphyry oxidation profile at Boyongan (600 m),...
Updating the 2001 National Land Cover Database land cover classification to 2006 by using Landsat imagery change detection methods
George Xian, Collin G. Homer, Joyce Fry
2009, Remote Sensing of Environment (113) 1133-1147
The recent release of the U.S. Geological Survey (USGS) National Land Cover Database (NLCD) 2001, which represents the nation's land cover status based on a nominal date of 2001, is widely used as a baseline for national land cover conditions. To enable the updating of this land cover information in...
Summary of current radiometric calibration coefficients for Landsat MSS, TM, ETM+, and EO-1 ALI sensors
G. Chander, B. L. Markham, D. L. Helder
2009, Remote Sensing of Environment (113) 893-903
This paper provides a summary of the current equations and rescaling factors for converting calibrated Digital Numbers (DNs) to absolute units of at-sensor spectral radiance, Top-Of-Atmosphere (TOA) reflectance, and at-sensor brightness temperature. It tabulates the necessary constants for the Multispectral Scanner (MSS), Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+),...
Symbiotic regulation of plant growth, development and reproduction
R. J. Rodriguez, D. Carl Freeman, E.D. McArthur, Y.-O. Kim, R. S. Redman
2009, Communitative and Integrative Biology (2) 141-143
The growth and development of rice (Oryzae sativa) seedlings was shown to be regulated epigenetically by a fungal endophyte. In contrast to un-inoculated (nonsymbiotic) plants, endophyte colonized (symbiotic) plants preferentially allocated resources into root growth until root hairs were well established. During that time symbiotic roots expanded at five times...
Constraining earthquake source inversions with GPS data: 1. Resolution-based removal of artifacts
M.T. Page, S. Custodio, R.J. Archuleta, J.M. Carlson
2009, Journal of Geophysical Research B: Solid Earth (114)
We present a resolution analysis of an inversion of GPS data from the 2004 Mw 6.0 Parkfield earthquake. This earthquake was recorded at thirteen 1-Hz GPS receivers, which provides for a truly coseismic data set that can be used to infer the static slip field. We find that the resolution...
Using nitrate dual isotopic composition (δ15N and δ18O) as a tool for exploring sources and cycling of nitrate in an estuarine system: Elkhorn Slough, California
Scott D. Wankel, Carol Kendall, Adina Paytan
2009, Journal of Geophysical Research G: Biogeosciences (114)
Nitrate (NO3−) concentrations and dual isotopic composition (δ15N and δ18O) were measured during various seasons and tidal conditions in Elkhorn Slough to evaluate mixing of sources of NO3− within this California estuary. We found the isotopic composition of NO3− was influenced most heavily by mixing of two primary sources with unique isotopic signatures,...
