Anaerobic methane oxidation in a landfill-leachate plume
Ethan L. Grossman, Luis A. Cifuentes, Isabelle M. Cozzarelli
2002, Environmental Science & Technology (36) 2436-2442
The alluvial aquifer adjacent to Norman Landfill, OK, provides an excellent natural laboratory for the study of anaerobic processes impacting landfill-leachate contaminated aquifers. We collected groundwaters from a transect of seven multilevel wells ranging in depth from 1.3 to 11 m that were oriented parallel to the flow path. The...
Field evidence for a protistan role in an organically-contaminated aquifer
Nancy E. Kinner, Ronald W. Harvey, David M. Shay, David W. Metge, Alan Warren
2002, Environmental Science & Technology (36) 4312-4318
The association between protists, bacteria, and dissolved organic carbon (DOC) in an oxygen-depleted, 6 km-long wastewater contaminant plume within a sandy aquifer (Cape Cod, MA) was investigated by comparing abundance patterns along longitudinal and vertical transects and at a control site. Strong linear correlations were observed between unattached bacterial abundance...
A review of bacterial methyl halide degradation: Biochemistry, genetics and molecular ecology
I.R. McDonald, K.L. Warner, C. McAnulla, C.A. Woodall, R.S. Oremland, J.C. Murrell
2002, Environmental Microbiology (4) 193-203
Methyl halide‐degrading bacteria are a diverse group of organisms that are found in both terrestrial and marine environments. They potentially play an important role in mitigating ozone depletion resulting from methyl chloride and methyl bromide emissions. The first step in the pathway(s) of methyl halide degradation...
Mercury(II) sorption to two Florida Everglades peat: Evidence for strong and weak binding and competition by dissolved organic matter released from the peat
R. Todd Drexel, Markus Haitzer, Joseph N. Ryan, George R. Aiken, Kathryn L. Nagy
2002, Environmental Science & Technology (36) 4058-4064
The binding of mercury(II) to two peats from Florida Everglades sites with different rates of mercury methylation was measured at pH 6.0 and 0.01 M ionic strength. The mercury(II) sorption isotherms, measured over a total mercury(II) range of 10-7.4 to 10-3.7 M, showed the competition for mercury(II) between the peat...
Editors' message: The past year and thanks
Robert Schneider, Clifford I. Voss
2002, Hydrogeology Journal (10) 1-2
No abstract available....
Atmospheric mercury deposition during the last 270 years: A glacial ice core record of natural and anthropogenic sources
Paul F. Schuster, David P. Krabbenhoft, David L. Naftz, L. DeWayne Cecil, Mark L. Olson, John F. DeWild, David D. Susong, Jaromy R. Green, Michael L. Abbott
2002, Environmental Science & Technology (36) 2303-2310
Mercury (Hg) contamination of aquatic ecosystems and subsequent methylmercury bioaccumulation are significant environmental problems of global extent. At regional to global scales, the primary mechanism of Hg contamination is atmospheric Hg transport. Thus, a better understanding of the long-term history of atmospheric Hg cycling and quantification of the sources is...
The evolving benthic community
Janet K. Thompson
2002, Report, Science and strategies for restoration
No abstract available....
United States streamflow probabilities and uncertainties based on anticipated El Niño, water year 2003
M. Dettinger, D. Cayan, K. Redmond
2002, Experimental Long-Lead Forecast Bulletin (11) 46-52
During the course of spring and summer 2002, tropical sea-surface temperatures in the eastern Pacific Ocean have warmed and the wind and pressure fields have shifted, so that by August, there was considerable confidence that water year (October–September) 2003 will be characterized by a weak to mild El Niño climate...
A comment on the use of flushing time, residence time, and age as transport time scales
Nancy E. Monsen, James E. Cloern, Lisa V. Lucas, Stephen G. Monismith
2002, Limnology and Oceanography (47) 1545-1553
Applications of transport time scales are pervasive in biological, hydrologic, and geochemical studies yet these times scales are not consistently defined and applied with rigor in the literature. We compare three transport time scales (flushing time, age, and residence time) commonly used to measure the retention of water or scalar...
Archiving, processing, and disseminating ASTER products at the USGS EROS Data Center
Brenda Jones, Brian L. Tolk
Barnes W.L., editor(s)
2002, Conference Paper
The U.S. Geological Survey EROS Data Center archives, processes, and disseminates Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data products. The ASTER instrument is one of five sensors onboard the Earth Observing System's Terra satellite launched December 18, 1999. ASTER collects broad spectral coverage with high spatial resolution at...
Comparison of the hydrogeology and water quality of a ground-water augmented lake with two non-augmented lakes in northwest Hillsborough County, Florida
Patricia A. Metz, Laura A. Sacks
2002, Water-Resources Investigations Report 2002-4032
The hydrologic effects associated with augmenting a lake with ground water from the Upper Floridan aquifer were examined in northwest Hillsborough County, Florida, from June 1996 through May 1999. The hydrogeology, ground-water flow patterns, water budgets, and water-quality characteristics were compared between a lake that has been augmented for more...
Stable carbon and nitrogen isotope composition of aquatic and terrestrial plants of the San Francisco Bay estuarine system
J. E. Cloern, E. A. Canuel, D. Harris
2002, Limnology and Oceanography (47) 713-729
We report measurements of seasonal variability in the C‐N stable isotope ratios of plants collected across the habitat mosaic of San Francisco Bay, its marshes, and its tributary river system. Analyses of 868 plant samples were binned into 10 groups (e.g., terrestrial riparian, freshwater phytoplankton, salt marsh)...
Using groundwater levels to estimate recharge
R. W. Healy, P.G. Cook
2002, Hydrogeology Journal (10) 91-109
Accurate estimation of groundwater recharge is extremely important for proper management of groundwater systems. Many different approaches exist for estimating recharge. This paper presents a review of methods that are based on groundwater-level data. The water-table fluctuation method may be the most widely used technique for estimating recharge; it requires...
Resident fish assemblages in shallow shorelines of a Columbia River impoundment
C.A. Barfoot, D.M. Gadomski, J.H. Petersen
2002, Northwest Science (76) 103-117
During May-September 1995, we replicated an earlier (1984-85) study of fishes in shoreline habitats of the John Day Reservoir, Columbia River, to investigate fish assemblage structure at several spatial and temporal scales. A total of 37,400 resident fishes representing 24 taxa was collected in 359 beach seine hauls. Fish catch...
The geohydrologic setting of Yucca Mountain, Nevada
J. S. Stuckless, W. W. Dudley
2002, Applied Geochemistry (17) 659-682
This paper provides a geologic and hydrologic framework of the Yucca Mountain region for the geochemical papers in this volume. The regional geologic units, which range in age from late Precambrian through Holocene, are briefly described. Yucca Mountain is composed of dominantly pyroclastic units that range in age from 11.4...
Interactions between groundwater and surface water: The state of the science
M. Sophocleous
2002, Hydrogeology Journal (10) 52-67
The interactions between groundwater and surface water are complex. To understand these interactions in relation to climate, landform, geology, and biotic factors, a sound hydrogeoecological framework is needed. All these aspects are synthesized and exemplified in this overview. In addition, the mechanisms of interactions between groundwater and surface water (GW-SW)...
Influence of fracture anisotropy on ground water ages and chemistry, Valley and Ridge province, Pennsylvania
W.C. Burton, Niel Plummer, E. Busenberg, B.D. Lindsey, W.J. Gburek
2002, Ground Water (40) 242-257
Model ground water ages based on chlorofluorocarbons (CFCs) and tritium/helium-3 (3H/3He) data were obtained from two arrays of nested piezometers located on the north limb of an anticline in fractured sedimentary rocks in the Valley and Ridge geologic province of Pennsylvania. The fracture geometry of the gently east plunging fold...
Groundwater hydrochemistry in the active layer of the proglacial zone, Finsterwalderbreen, Svalbard
R.J. Cooper, J.L. Wadham, M. Tranter, R. Hodgkins, N.E. Peters
2002, Journal of Hydrology (269) 208-223
Glacial bulk meltwaters and active-layer groundwaters were sampled from the proglacial zone of Finsterwalderbreen during a single melt season in 1999, in order to determine the geochemical processes that maintain high chemical weathering rates in the proglacial zone of this glacier. Results demonstrate that the principle means of solute acquisition...
Monitoring artificially stimulated fluid movement in the Cretaceous Dakota aquifer, western Kansas
P. A. Macfarlane, A. Forster, D. F. Merriam, J. Schrotter, J.M. Healey
2002, Hydrogeology Journal (10) 662-673
Aquifer properties can be evaluated by monitoring artificially stimulated fluid movements between wells, if the fluid is heated. Changes in the temperature profile recorded in observation wells indicate the flow path of the heated fluid, which in effect acts as a tracer. A fluid-flow experiment in the Cretaceous Dakota Formation...
Weathering reactions and hyporheic exchange controls on stream water chemistry in a glacial meltwater stream in the McMurdo Dry Valleys
Michael N. Gooseff, Diane M. McKnight, W. Berry Lyons, Alex E. Blum
2002, Water Resources Research (38) 15-1-15-17
In the McMurdo Dry Valleys, Antarctica, dilute glacial meltwater flows down well‐established streambeds to closed basin lakes during the austral summer. During the 6–12 week flow season, a hyporheic zone develops in the saturated sediment adjacent to the streams. Longer Dry Valley streams have higher concentrations of major ions than...
Regional controls on geomorphology, hydrology, and ecosystem integrity in the Orinoco Delta, Venezuela
A.G. Warne, R.H. Meade, W.A. White, E.H. Guevara, J. Gibeaut, R.C. Smyth, A. Aslan, T. Tremblay
2002, Geomorphology (44) 273-307
Interacting river discharge, tidal oscillation, and tropical rainfall across the 22,000 km2 Orinoco delta plain support diverse fresh and brackish water ecosystems. To develop environmental baseline information for this largely unpopulated region, we evaluate major coastal plain, shallow marine, and river systems of northeastern South America, which serves to identify...
Nitrate stable isotopes: Tools for determining nitrate sources among different land uses in the Mississippi River Basin
Cecily C.Y. Chang, C. Kendall, S. R. Silva, W.A. Battaglin, K. Campbell
2002, Canadian Journal of Fisheries and Aquatic Sciences (59) 1874-1885
A study was conducted to determine whether NO3 stable isotopes (δ15N and δ18O), at natural abundance levels, could discriminate among NO3 sources from sites with different land uses at the basin scale. Water samples were collected from 24 sites in the Mississippi River Basin...
Reactivity and mobility of new and old mercury deposition in a boreal forest ecosystem during the first year of the METAALICUS study
H. Hintelmann, R. Harris, A. Heyes, J.P. Hurley, C.A. Kelly, D. P. Krabbenhoft, S. Lindberg, J.W.M. Rudd, K.J. Scott, Louis
2002, Environmental Science & Technology (36) 5034-5040
The METAALICUS (Mercury Experiment To Assess Atmospheric Loading In Canada and the US) project is a whole ecosystem experiment designed to study the activity, mobility, and availability of atmospherically deposited mercury. To investigate the dynamics of mercury newly deposited onto a terrestrial ecosystem, an enriched stable isotope...
Interannual variations in snowpack in the Crown of the Continent Ecosystem
D.J. Selkowitz, D.B. Fagre, B.A. Reardon
2002, Hydrological Processes (16) 3651-3665
Ecosystem changes such as glacier recession and alpine treeline advance have been documented over the previous 150 years in the Rocky Mountains of northern Montana and southern British Columbia and Alberta, a region known as the Crown of the Continent Ecosystem (CCE). Such changes are controlled, at least partially, by...
A new metric for determining the importance of transient storage
R.L. Runkel
2002, Journal of the North American Benthological Society (21) 529-543
A review of various metrics used to characterize transient storage indicates that none of the existing measures successfully integrate the interaction between advective velocity and the transient storage parameters (storage zone area, storage zone exchange coefficient). Further, 2 existing metrics are related to mean travel time, a quantity that is...
