Effects of nitrate and water on the oxygen isotopic analysis of barium sulfate precipitated from water samples
Janet E. Hannon, J.K. Bohlke, Stanley J. Mroczkowski
2008, Rapid Communications in Mass Spectrometry (22) 4109-4120
BaSO4 precipitated from mixed salt solutions by common techniques for SO isotopic analysis may contain quantities of H2O and NO that introduce errors in O isotope measurements. Experiments with synthetic solutions indicate that δ18O values of CO produced by decomposition of precipitated...
Mass balance of a cirque glacier in the U.S. Rocky Mountains
Blase A. Reardon, J. T. Harper, Daniel B. Fagre
2008, Conference Paper, Proceedings of the Mass Balance Measurement and Modelling Workshop
Glacier National Park, Montana, USA, contains 27 cirque glaciers, most less than 1 km2 and together comprising about 17 km2. These glaciers lie at relatively low elevation (2000 – 3000 m a.s.l.) and latitude (48o N) and have undergone dramatic retreat since the mid-nineteenth century, when an estimated 150 glaciers...
Protocol for use of regenerated cellulose dialysis membrane diffusion samplers (ER-0313)
Thomas E. Imbrigiotta, Joseph S. Trotsky, M.C. Place
2008, Report
No abstract available....
Invasive species
Beth A. Middleton
2008, Book chapter, Encyclopedia of ecology
No abstract available....
Estrogens, estrogen receptors and their role as immunoregulators in fish
Luke R. Iwanowicz, Christopher A. Ottinger
2008, Book chapter, Fish Defenses, Vol. 1: Immunology
No abstract available....
Isotopic constraints on the chemical evolution of geothermal fluids, Long Valley, CA
Shaun T. Brown, B. Mack Kennedy, Donald J. DePaolo, William C. Evans
2008, Geothermal Resources Council Transactions (32) 269-272
A spatial survey of the chemical and isotopic composition of fluids from the Long Valley hydrothermal system was conducted. Starting at the presumed hydrothermal upwelling zone in the west moat of the caldera, samples were collected from the Casa Diablo geothermal field and a series of monitoring wells defining a...
The ecological and hydrological significance of ephemeral and intermittent streams in the arid and semi-arid American Southwest
Lainie R. Levick, David C. Goodrich, Mariano Hernandez, Julia Fonseca, Darius J. Semmens, Juliet C. Stromberg, Melanie Tluczek, R. A. Leidy, Melissa Scianni, D. Phillip Guertin, William G. Kepner
2008, Report
No abstract available....
Establishing major permeability controls in the Mak-Ban geothermal field, Philippines
Ronald O. Vicedo, James Stimac, Vilma T. Capuno, Jacob B. Lowenstern
2008, Geothermal Resources Council Transactions (32) 309-314
Recent updating of the conceptual model of the Mak-Ban (Bulalo) geothermal field verified both structural and stratigraphic controls on permeability and connectivity in the reservoir. Two silicic units within the predominantly andesitic production zone were identified from borehole logs, core and drill cuttings. Whole rock chemical data and petrographic analysis...
Stratigraphy of the Calvert, Choptank, and St. Marys Formations (Miocene) in the Chesapeake Bay area, Maryland and Virginia
Lauck W. Ward, George W. Andrews
2008, Book
No abstract available....
Urbanization and changing land use in the Great Basin
Alicia A. Torregrosa, Nora Devoe
2008, General Technical Report RMRS-GTR-204
No abstract available....
Coastal Louisiana ecosystem assessment and restoration program: The role of ecosystem forecasting in evaluating restoration planning in the Mississippi River Deltaic Plain
Robert Twilley, Brady Couvillion, Imtiaz Hossain, Carola Kaiser, Alaina Owens, Gregory D. Steyer, Jenneke M. Visser
2008, Conference Paper, Mitigating impacts of natural hazards on fishery ecosystems
The development of ecosystem management plans to restore and rehabilitate natural resources requires an understanding of how specific ecological mechanisms regulate the structure and function of ecosystems. To achieve restoration goals, comprehensive plans and engineering designs must effectively change environmental drivers at the regionallevel to reduce stress conditions at the local environment...
Wildland fire in ecosystems: Fire and nonnative invasive plants
Kristin Zouhar, Jane Kapler Smith, Steve Sutherland, Matthew L. Brooks
2008, General Technical Report RMRS-GTR-42
This state-of-knowledge review of information on relationships between wildland fire and nonnative invasive plants can assist fire managers and other land managers concerned with prevention, detection, and eradication or control of nonnative invasive plants. The 16 chapters in this volume synthesize ecological and botanical principles regarding relationships between wildland fire and nonnative...
Probabilistic liquefaction hazard mapping
Thomas L. Holzer
2008, Conference Paper, Proceedings of geotechnical earthquake engineering and soil dynamics IV
Many investigators have applied the liquefaction potential index (LPI) to map regional liquefaction hazard. LPI, which integrates the liquefaction potential of susceptible soil elements at a specific location into a single value, has been used to assess both (1) spatial variability of liquefaction potential, and (2) liquefaction potential of surficial...
Experimental and field observations of breach dynamics accompanying erosion of Marmot Cofferdam, Sandy River, Oregon
G. E. Grant, Jeffrey D. G. Marr, C. Hill, S. Johnson, K. Campbell, O. Mohseni, J.R. Wallick, S.L. Lewis, E. A. O’connor, Jon J. Major
2008, Conference Paper
A key issue faced in dam removal is the rate and timing of remobilization and discharge of stored reservoir sediments following the removal. Different removal strategies can result in different trajectories of upstream sediment transport and knickpoint migration. We examine this issue of for the Marmot Dam removal in Sandy...
Spatial and temporal trends in nitrate concentrations in the eastern San Joaquin Valley regional aquifer and implications for fertilizer management
Karen R. Burow, Christopher T. Green
2008, Conference Paper, Proceedings of the American Society of Agronomy, California Chapter annual meeting
Ground-water withdrawals in the San Joaquin Valley totaled 64 million m3 /day (19 million ac-ft) in 2000, supplying about 45% of agricultural irrigation demand and about 80% of municipal supply (Hutson et al., 2004). Most of the population and ground-water use are in the eastern San Joaquin Valley, where reliance...
A new towed platform for the unobtrusive surveying of benthic habitats and organisms
David G. Zawada, P.R. Thompson, J. Butcher
2008, Revista de Biología Tropical: International Journal of Tropical Biology and Conservation (56) 51-63
Maps of coral ecosystems are needed to support many conservation and management objectives, as well as research activities. Examples include ground-truthing aerial and satellite imagery, characterizing essential habitat, assessing changes, and monitoring the progress of restoration efforts. To address some of these needs, the U.S. Geological Survey developed the Along-Track...
Corals as bioindicators of climate change
Eugene A. Shinn
2008, Environmental Bioindicators (3) 149-152
Potential effects of climate change and ocean acidification have energized much discussion among coral scientists, especially biologists. Will corals go extinct, lose their skeletons, or migrate pole-ward to cooler waters? No one knows, but some simple experiments, recent observations, and recent studies may shed some light on these questions. Above...
Could mangroves be Tampa Bay's next cash crop?
Matthew Cimitile
2008, Bay Soundings
Obviously, no one is recommending cutting down mangroves to sell, but environmental managers are working toward putting a price tag on the benefits they provide to help ensure that they are protected. Though the process is just beginning here, estimates from studies in other locations indicate that the 15,000 acres...
Recovering endemic plants of the Channel Islands
Kathryn McEachern
2008, Endangered Species Bulletin (33) 40-43
At the California Channel Islands, off the state’s southern coast, cold waters from the north mix with warmer waters from the south. Each of the eight Channel Islands, which were never connected to the mainland, developed unique floras as colonizing plants adapted to their new island homes. This part of...
Physical property changes in hydrate-bearing sediment due to depressurization and subsequent repressurization
W.F. Waite, T.J. Kneafsey, W.J. Winters, D.H. Mason
2008, Journal of Geophysical Research B: Solid Earth (113)
Physical property measurements of sediment cores containing natural gas hydrate are typically performed on material exposed, at least briefly, to non-in situ conditions during recovery. To examine the effects of a brief excursion from the gas-hydrate stability field, as can occur when pressure cores are transferred to pressurized storage vessels,...
Confirming field assessments and measuring disease impacts
Thierry M. Work, Cheryl M. Woodley, L. Raymundo
2008, Book chapter, A coral disease handbook: Guidelines for assessment, monitoring, and management
No abstract available....
A note on the effect of wind waves on vertical mixing in Franks Tract, Sacramento-San Joaquin Delta, California, USA
Janet K. Thompson, Nicole L. Jones, Stephen G. Monismith
2008, San Francisco Estuary and Watershed Science (6) 1-11
A one-dimensional numerical model that simulates the effects of whitecapping waves was used to investigate the importance of whitecapping waves to vertical mixing at a 3-meter-deep site in Franks Tract in the Sacramento-San Joaquin Delta over an 11-day period. Locally-generated waves of mean period approximately 2 s were generated under...
Reef geology and biology of Navassa Island
Margaret W. Miller, Robert B. Halley, Arthur C.R. Gleason
2008, Book chapter, Coral reefs of the USA
Navassa is a small oceanic island (5.2km2 in size) located ~30km west of the southwest tip of Haiti, 160km south of the US Naval Base at Guantanamo Bay, Cuba, and in the heart of the Windward Passage. Navassa was claimed in 1856 by the United States. Navassa has also been...
Observations and a model of undertow over the inner continental shelf
Steven J. Lentz, Melanie Fewings, Peter Howd, Janet Fredericks, Kent Hathaway
2008, Journal of Physical Oceanography (38) 2341-2357
Onshore volume transport (Stokes drift) due to surface gravity waves propagating toward the beach can result in a compensating Eulerian offshore flow in the surf zone referred to as undertow. Observed offshore flows indicate that wave-driven undertow extends well offshore of the surf zone, over the inner shelves of Martha’s...
Scientific objectives of the Gulf of Mexico gas hydrate JIP leg II drilling
Emrys Jones, T. Latham, Daniel R. McConnell, Matthew Frye, J.H. Hunt, William Shedd, Dianna Shelander, Ray Boswell, Kelly K. Rose, Carolyn D. Ruppel, Deborah R. Hutchinson, Timothy S. Collett, Brandon Dugan, Warren T. Wood
2008, Conference Paper, Offshore Technology Conference
The Gulf of Mexico Methane Hydrate Joint Industry Project (JIP) has been performing research on marine gas hydrates since 2001 and is sponsored by both the JIP members and the U.S. Department of Energy. In 2005, the JIP drilled the Atwater Valley and Keathley Canyon exploration blocks in the Gulf...
