Aggregate stability and size distribution
John R. Nimmo, K. Perkins
Jacob H. Dane, G. Clarke Topp, editor(s)
2002, Book chapter, Methods of soil analysis, part 4, physical methods
No abstract available. ...
Steady-state centrifuge [simultaneous determination of water transmission and retention properties--direct methods--laboratory]
John R. Nimmo, K. Perkins, A. M. Lewis
2002, Book chapter, Methods of soil analysis, part 4, physical methods
No abstract available. ...
Property-transfer models
R. Haverkamp, John R. Nimmo, P. Reggiani
2002, Book chapter, Methods in soil analysis: Part 4 physical methods
No abstract available....
Controlled liquid-volume [water retention and storage]
K.A. Winfield, John R. Nimmo
2002, Book chapter, Methods of soil analysis: Part 4 physical methods
No abstract available....
Miscellaneous methods [water retention and storage]
John R. Nimmo, K.A. Winfield
2002, Book chapter, Methods in soil analysis: Part 4 physical methods
No abstract available....
Guidelines for method selection (water retention and storage)
John R. Nimmo
2002, Book chapter, Methods of soil analysis: Part 4 physical methods
No abstract available....
Geology and land use in the western part of the Gulf Coast coal-bearing region
2002, Bureau of Economic Geology (Texas), Miscellaneous Maps MM0041
This map series is a compilation of the outcrop geology in the U.S. Gulf Coast coal region. The maps show the regional geologic setting for primary coal occurrences and detailed geology and historic mining areas.The CD contains ESRI ArcView SHP files of cities, urban areas, historical mines (points and polygons),...
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...
Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method
K.L. Casciotti, D.M. Sigman, M. Galanter Hastings, J. K. Böhlke, A. Hilkert
2002, Analytical Chemistry (74) 4905-4912
We report a novel method for measurement of the oxygen isotopic composition (18O/16O) of nitrate (NO3-) from both seawater and freshwater. The denitrifier method, based on the isotope ratio analysis of nitrous oxide generated from sample nitrate by cultured denitrifying bacteria, has been described elsewhere for its use in nitrogen...
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...
Mobilization of natural colloids from an iron oxide-coated sand aquifer: Effect of pH and ionic strength
Rebecca A. Bunn, Robin D. Magelky, Joseph N. Ryan, Menachem Elimelech
2002, Environmental Science & Technology (36) 314-322
Field and laboratory column experiments were performed to assess the effect of elevated pH and reduced ionic strength on the mobilization of natural colloids in a ferric oxyhydroxide-coated aquifer sediment. The field experiments were conducted as natural gradient injections of groundwater amended by sodium hydroxide additions. The laboratory experiments were...
Determination of the total oxygen isotopic composition of nitrate and the calibration of a Δ17Ο nitrate reference material
Greg Michalski, Joel Savarino, J.K. Böhlke, Mark Thiemens
2002, Analytical Chemistry (74) 4989-4993
A thermal decomposition method was developed and tested for the simultaneous determination of δ18O and δ17Ο in nitrate. The thermal decomposition of AgNO3 allows for the rapid and accurate determination of 18O/16O and 17O/16O isotopic ratios with a precision of ±1.5‰ for δ18O and ±0.11‰ for Δ17Ο (Δ17Ο = δ17Ο...
Distribution, production, and ecophysiology of Picocystis strain ML in Mono Lake, California
Collin S. Roesler, Charles W. Culbertson, Stacey M. Etheridge, Ralf Goericke, Ronald P. Kiene, Laurence G. Miller, Ronald S. Oremland
2002, Limnology and Oceanography (47) 440-452
A recently described unicellular chlorophytic alga isolated from meromictic Mono Lake, California, occupies a niche that spans two environments: the upper oxic mixolimnion and the deeper anoxic and highly reducing monimolimnion. This organism, Picocystis sp. strain ML, accounts for nearly 25% of the primary production during the winter bloom and...
Using spring-water chemistry to assess groundwater contamination and ages of shallow and deep ground water flow systems
B. G. Katz, J.K. Bohlke, D. Hornsby
2002, Book chapter, Hydrology and biology of post-paleozoic carbonate aquifers, Karst Waters Institute Special Publication 7
No abstract available....
Field and laboratory investigations of inactivation of viruses (PRD1 and MS2) attached to iron oxide-coated quartz sand
Joseph N. Ryan, Ronald W. Harvey, David W. Metge, Menachem Elimelech, Theresa Navigato, Ann P. Pieper
2002, Environmental Science & Technology (36) 2403-2413
Field and laboratory experiments were conducted to investigate inactivation of viruses attached to mineral surfaces. In a natural gradient transport field experiment, bacteriophage PRD1, radiolabeled with 32P, was injected into a ferric oxyhydroxide-coated sand aquifer with bromide and linear alkylbenzene sulfonates. In a zone of the aquifer contaminated by secondary...
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...
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...
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...
Hydrogeologic framework, ground-water geochemistry, and assessment of nitrogen yield from base flow in two agricultural watersheds, Kent County, Maryland
L. J. Bachman, D.E. Krantz, J.K. Bohlke
2002, Report
Hydrostratigraphic and geochemical data collected in two adjacent watersheds on the Delmarva Peninsula, in Kent County, Maryland, indicate that shallow subsurface stratigraphy is an important factor that affects the concentrations of nitrogen in ground water discharging as stream base flow. The flux of nitrogen from shallow aquifers can contribute substantially...
Editors' message: The past year and thanks
Robert Schneider, Clifford I. Voss
2002, Hydrogeology Journal (10) 1-2
No abstract available....
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...
Relating net nitrogen input in the Mississippi River Basin to nitrate flux in the Lower Mississippi River--A comparison of approaches
Gregory F. McIsaac, Mark B. David, George Z. Gertner, Donald A. Goolsby
2002, Journal of Environmental Quality (31) 1610-1622
A quantitative understanding of the relationship between terrestrial N inputs and riverine N flux can help guide conservation, policy, and adaptive management efforts aimed at preserving or restoring water quality. The objective of this study was to compare recently published approaches for relating terrestrial N inputs to the Mississippi River...
Thermocouple psychrometry
Brian J. Andraski, Bridget R. Scanlon
Jacob H. Dane, G. Clarke Topp, editor(s)
2002, Soil Science Society of America Book Series 5.4-3.2.3
Thermocouple psychrometry is a technique that infers the water potential of the liquid phase of a sample from measurements within the vapor phase that is in equilibrium with the sample. The theoretical relation between water potential of the liquid phase and relative humidity of the vapor phase is given by...
The evolving benthic community
Janet K. Thompson
2002, Report, Science and strategies for restoration
No abstract available....
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...
