Heat, chloride, and specific conductance as ground water tracers near streams
M.H. Cox, G.W. Su, J. Constantz
2007, Ground Water (45) 187-195
Commonly measured water quality parameters were compared to heat as tracers of stream water exchange with ground water. Temperature, specific conductance, and chloride were sampled at various frequencies in the stream and adjacent wells over a 2-year period. Strong seasonal variations in stream water...
Concentration, UV-spectroscopic characteristics and fractionation of DOC in stormflow from an urban stream, Southern California, USA
John A. Izbicki, Isabel Pimentel, Russell Johnson, George R. Aiken, Jerry Leenheer
2007, Environmental Chemistry (4) 35-48
The composition of dissolved organic carbon (DOC) in stormflow from urban areas has been greatly altered, both directly and indirectly, by human activities and there is concern that there may be public health issues associated with DOC, which has unknown composition from different sources within urban watersheds. This...
Space geodetic observation of expansion of the San Gabriel Valley, California, aquifer system, during heavy rainfall in winter 2004-2005
N.E. King, D. Argus, J. Langbein, D.C. Agnew, G. Bawden, R.S. Dollar, Z. Liu, D. Galloway, E. Reichard, A. Yong, F.H. Webb, Y. Bock, K. Stark, D. Barseghian
2007, Journal of Geophysical Research B: Solid Earth (112)
[1] Starting early in 2005, the positions of GPS stations in the San Gabriel valley region of southern California showed statistically significant departures from their previous behavior. Station LONG moved up by about 47 mm, and nearby stations moved away from LONG by about 10 mm....
Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR
E.S. Boss, R. Collier, G. Larson, K. Fennel, W.S. Pegau
2007, Hydrobiologia (574) 149-159
Spectral inherent optical properties (IOPs) have been measured at Crater Lake, OR, an extremely clear sub-alpine lake. Indeed Pure water IOPs are major contributors to the total IOPs, and thus to the color of the lake. Variations in the spatial distribution of IOPs were observed in June and September 2001,...
A chronology of Late-Pleistocene permafrost events in southern New Jersey, eastern USA
H.M. French, M. Demitroff, S.L. Forman, Wayne L. Newell
2007, Permafrost and Periglacial Processes (18) 49-59
Frost fissures, filled with wind-abraded sand and mineral soil, and numerous small-scale non-diastrophic deformations, occur in the near-surface sediments of the Pine Barrens of southern New Jersey. The fissures are the result of thermal-contraction cracking and indicate the previous existence of either permafrost or seasonally-frozen ground. The deformations reflect thermokarst...
Carbon export and cycling by the Yukon, Tanana, and Porcupine rivers, Alaska, 2001-2005
Robert G. Striegl, Mark M. Dornblaser, George R. Aiken, Kimberly P. Wickland, Peter A. Raymond
2007, Water Resources Research (43)
Loads and yields of dissolved and particulate organic and inorganic carbon (DOC, POC, DIC, PIC) were measured and modeled at three locations on the Yukon River (YR) and on the Tanana and Porcupine rivers (TR, PR) in Alaska during 2001–2005. Total YR carbon export averaged 7.8 Tg C yr−1, 30%...
Pre-eruption recharge of the Bishop magma system
D.A. Wark, W. Hildreth, F.S. Spear, D.J. Cherniak, E.B. Watson
2007, Geology (35) 235-238
The 650 km3 rhyolitic Bishop Tuff (eastern California, USA), which is stratigraphically zoned with respect to temperatures of mineral equilibration, reflects a corresponding thermal gradient in the source magma chamber. Consistent with previous work, application of the new TitaniQ (Ti-in-quartz) thermometer to quartz phenocryst rims documents an ∼100 °C temperature increase...
Phase equilibria constraints on the chemical and physical evolution of the campanian ignimbrite
S. J. Fowler, F. J. Spera, W.A. Bohrson, H. E. Belkin, B. de Vivo
2007, Journal of Petrology (48) 459-493
The Campanian Ignimbrite is a > 200 km3 trachyte-phonolite pyroclastic deposit that erupted at 39.3 ?? 0.1 ka within the Campi Flegrei west of Naples, Italy. Here we test the hypothesis that Campanian Ignimbrite magma was derived by isobaric crystal fractionation of a parental basaltic trachyandesitic melt that reacted and...
Simulation of Intra- or transboundary surface-water-rights hierarchies using the farm process for MODFLOW-2000
W. Schmid, R. T. Hanson
2007, Journal of Water Resources Planning and Management (133) 166-178
Water-rights driven surface-water allocations for irrigated agriculture can be simulated using the farm process for MODFLOW-2000. This paper describes and develops a model, which simulates routed surface-water deliveries to farms limited by streamflow, equal-appropriation allotments, or a ranked prior-appropriation system. Simulated diversions account for deliveries to all...
Remote sensing and GIS technology in the Global Land Ice Measurements from Space (GLIMS) Project
B. Raup, Andreas Kaab, J.S. Kargel, M.P. Bishop, G. Hamilton, E. Lee, F. Paul, F. Rau, D. Soltesz, S.J.S. Khalsa, M. Beedle, C. Helm
2007, Computers & Geosciences (33) 104-125
Global Land Ice Measurements from Space (GLIMS) is an international consortium established to acquire satellite images of the world's glaciers, analyze them for glacier extent and changes, and to assess these change data in terms of forcings. The consortium is organized into a system of Regional Centers, each of which...
Long-term limnological research and monitoring at Crater Lake, Oregon
G.L. Larson, R. Collier, M. Buktenica
2007, Hydrobiologia (574) 1-11
Crater Lake is located in the caldera of Mount Mazama in Crater Lake National Park, Oregon. The lake has a surface area of about 53 km2at an elevation of 1882 m and a maximum depth of 594 m. Limited studies of this ultraoligotrophic lake conducted between 1896 and 1981, lead...
Hydrothermal fluid flow and deformation in large calderas: Inferences from numerical simulations
Shaul Hurwitz, L.B. Christiansen, Paul A. Hsieh
2007, Journal of Geophysical Research B: Solid Earth (112)
[1] Inflation and deflation of large calderas is traditionally interpreted as being induced by volume change of a discrete source embedded in an elastic or viscoelastic half-space, though it has also been suggested that hydrothermal fluids may play a role. To test the latter hypothesis, we...
Ovarian follicle dynamics of female Greater Scaup during egg production
Kristen B. Gorman, Paul L. Flint, Daniel Esler, T.D. Williams
2007, Journal of Field Ornithology (78) 64-73
Studies of female waterfowl nutrient reserve use during egg production require a precise understanding of ovarian follicle dynamics to correctly interpret breeding status, and, therefore, derive proper inference. Concerns over numerical declines of North American scaup have increased the need to better understand the role of female condition in reproductive...
Subaqueous geology and a filling model for Crater Lake, Oregon
M. Nathenson, C. R. Bacon, D.W. Ramsey
2007, Hydrobiologia (574) 13-27
Results of a detailed bathymetric survey of Crater Lake conducted in 2000, combined with previous results of submersible and dredge sampling, form the basis for a geologic map of the lake floor and a model for the filling of Crater Lake with water. The most prominent landforms beneath the surface...
Upper cretaceous microbial petroleum systems in north-central Montana
Paul G. Lillis
2007, Mountain Geologist (44) 11-35
Cenomanian to Campanian rocks of north-central Montana contain shallow economic accumulations of dry natural gas derived from microbial methanogenesis. The methanogens utilized carbon dioxide derived from organic matter in the marginal marine sediments and hydrogen from in situ pore water to generate methane. The most recent USGS assessment of the shallow...
Heat transport in the Red Lake Bog, Glacial Lake Agassiz Peatlands
J.M. McKenzie, D. I. Siegel, Donald O. Rosenberry, P.H. Glaser, Clifford I. Voss
2007, Hydrological Processes (21) 369-378
We report the results of an investigation on the processes controlling heat transport in peat under a large bog in the Glacial Lake Agassiz Peatlands. For 2 years, starting in July 1998, we recorded temperature at 12 depth intervals from 0 to 400 cm within a vertical peat profile at...
Hydrologic response of the Crow Wing Watershed, Minnesota, to mid-Holocene climate change
M. Person, P. Roy, H. Wright, W. Gutowski Jr., E. Ito, T. Winter, D. Rosenberry, D. Cohen
2007, Geological Society of America Bulletin (119) 363-376
In this study, we have integrated a suite of Holocene paleoclimatic proxies with mathematical modeling in an attempt to obtain a comprehensive picture of how watersheds respond to past climate change. A three-dimensional surface-water-groundwater model was developed to assess the effects of mid-Holocene climate change on water resources within the...
Effects of upland disturbance and instream restoration on hydrodynamics and ammonium uptake in headwater streams
B.J. Roberts, P. J. Mulholland, J.N. Houser
2007, Journal of the North American Benthological Society (26) 38-53
Delivery of water, sediments, nutrients, and organic matter to stream ecosystems is strongly influenced by the catchment of the stream and can be altered greatly by upland soil and vegetation disturbance. At the Fort Benning Military Installation (near Columbus, Georgia), spatial variability in intensity of military training results in a...
Relating low‐flow characteristics to the base flow recession time constant at partial record stream gauges
Ken Eng, P. C. D. Milly
2007, Water Resources Research (43)
Base flow recession information is helpful for regional estimation of low‐flow characteristics. However, analyses that exploit such information generally require a continuous record of streamflow at the estimation site to characterize base flow recession. Here we propose a simple method for characterizing base flow recession at low‐flow partial record stream...
Variability of kokanee and rainbow trout food habits, distribution, and population dynamics, in an ultraoligotrophic lake with no manipulative management
M.W. Buktenica, S.F. Girdner, G.L. Larson, C. D. McIntire
2007, Hydrobiologia (574) 235-264
Crater Lake is a unique environment to evaluate the ecology of introduced kokanee and rainbow trout because of its otherwise pristine state, low productivity, absence of manipulative management, and lack of lotic systems for fish spawning. Between 1986 and 2004, kokanee displayed a great deal of variation in population demographics...
Aquifer-scale controls on the distribution of nitrate and ammonium in ground water near La Pine, Oregon, USA
Stephen R. Hinkle, John Karl Bohlke, John H. Duff, David S. Morgan, Rodney J. Weick
2007, Journal of Hydrology (333) 486-503
Geochemical and isotopic tools were applied at aquifer, transect, and subtransect scales to provide a framework for understanding sources, transport, and fate of dissolved inorganic N in a sandy aquifer near La Pine, Oregon. NO3 is a common contaminant in shallow ground water in this area, whereas high concentrations of...
S-33 constraints on the seawater sulfate contribution in modern seafloor hydrothermal vent sulfides
Shuhei Ono, Wayne C. Shanks III, O.J. Rouxel, D. Rumble
2007, Geochimica et Cosmochimica Acta (71) 1170-1182
Sulfide sulfur in mid-oceanic ridge hydrothermal vents is derived from leaching of basaltic-sulfide and seawater-derived sulfate that is reduced during high temperature water rock interaction. Conventional sulfur isotope studies, however, are inconclusive about the mass-balance between the two sources because 34S/32S ratios of vent fluid H2S and chimney sulfide minerals...
Suboxic deep seawater in the late Paleoproterozoic: Evidence from hematitic chert and iron formation related to seafloor-hydrothermal sulfide deposits, central Arizona, USA
J. F. Slack, Tor Grenne, A. Bekker, O.J. Rouxel, P. A. Lindberg
2007, Earth and Planetary Science Letters (255) 243-256
A current model for the evolution of Proterozoic deep seawater composition involves a change from anoxic sulfide-free to sulfidic conditions 1.8??Ga. In an earlier model the deep ocean became oxic at that time. Both models are based on the secular distribution of banded iron formation (BIF) in shallow marine sequences....
Denitrification in the shallow ground water of a tile-drained, agricultural watershed
E. Mehnert, H.-H. Hwang, T.M. Johnson, R.A. Sanford, W.C. Beaumont, T.R. Holm
2007, Journal of Environmental Quality (36) 80-90
Nonpoint-source pollution of surface water by N is considered a major cause of hypoxia. Because Corn Belt watersheds have been identified as major sources of N in the Mississippi River basin, the fate and transport of N from midwestern agricultural watersheds have received considerable interest. The fate and transport of...
Comparison of evapotranspiration rates for flatwoods and ridge citrus
X. Jia, A. Swancar, J.M. Jacobs, M.D. Dukes, K. Morgan
2007, Transactions of the ASABE (50) 83-94
Florida citrus groves are typically grown in two regions of the state: flatwoods and ridge. The southern flatwoods citrus area has poorly drained fine textured sands with low organic matter in the shallow root zone. Ridge citrus is located in the northern ridge citrus zone and has fine to coarse...
