Flow regime, temperature, and biotic interactions drive differential declines of trout species under climate change
S.J. Wenger, D.J. Isaak, C.H. Luce, H.M. Neville, K.D. Fausch, J. B. Dunham, D.C. Dauwalter, M.K. Young, M.M. Elsner, B.E. Rieman, A.F. Hamlet, J.E. Williams
2011, Proceedings of the National Academy of Sciences of the United States of America (108) 14175-14180
Broad-scale studies of climate change effects on freshwater species have focused mainly on temperature, ignoring critical drivers such as flow regime and biotic interactions. We use downscaled outputs from general circulation models coupled with a hydrologic model to forecast the effects of altered flows and increased temperatures on four interacting...
Mars: the evolutionary history of the northern lowlands based on crater counting and geologic mapping
S.C. Werner, K. L. Tanaka, J.A. Skinner Jr.
2011, Planetary and Space Science (59) 1143-1165
The geologic history of planetary surfaces is most effectively determined by joining geologic mapping and crater counting which provides an iterative, qualitative and quantitative method for defining relative ages and absolute model ages. Based on this approach, we present spatial and temporal details regarding the evolution of the Martian northern...
Modeled sources, transport, and accumulation of dissolved solids in water resources of the southwestern United States
D.W. Anning
2011, Journal of the American Water Resources Association (47) 1087-1109
Information on important source areas for dissolved solids in streams of the southwestern United States, the relative share of deliveries of dissolved solids to streams from natural and human sources, and the potential for salt accumulation in soil or groundwater was developed using a SPAtially Referenced Regressions On Watershed attributes...
Tracking nonpoint source nitrogen pollution in human-impacted watersheds
Sujay S. Kaushal, Peter M Groffman, Lawrence Band, Emily M. Elliott, Catherine A. Shields, Carol Kendall
2011, Environmental Science & Technology (45) 8225-8232
Nonpoint source nitrogen (N) pollution is a leading contributor to U.S. water quality impairments. We combined watershed N mass balances and stable isotopes to investigate fate and transport of nonpoint N in forest, agricultural, and urbanized watersheds at the Baltimore Long-Term Ecological Research site. Annual N retention was 55%, 68%,...
Rainfall intensity-duration thresholds for postfire debris-flow emergency-response planning
S.H. Cannon, E.M. Boldt, J.L. Laber, J. W. Kean, D.M. Staley
2011, Natural Hazards (59) 209-236
Following wildfires, emergency-response and public-safety agencies can be faced with evacuation and resource-deployment decisions well in advance of coming winter storms and during storms themselves. Information critical to these decisions is provided for recently burned areas in the San Gabriel Mountains of southern California. A compilation of information on the...
Native Americans, regional drought and tree Island evolution in the Florida Everglades
C. Bernhardt
2011, Holocene (21) 967-978
This study uses palynologic data to determine the effects of regional climate variability and human activity on the formation and development of tree islands during the last ~4000 years. Although prolonged periods of aridity have been invoked as one mechanism for their formation, Native American land use has also been...
Remote sensing of soil moisture using airborne hyperspectral data
M. Finn, M. Lewis, D. Bosch, Mario Giraldo, K. Yamamoto, D. Sullivan, R. Kincaid, R. Luna, G. Allam, Craig Kvien, Murray Williams
2011, GIScience and Remote Sensing (48) 522-540
Landscape assessment of soil moisture is critical to understanding the hydrological cycle at the regional scale and in broad-scale studies of biophysical processes affected by global climate changes in temperature and precipitation. Traditional efforts to measure soil moisture have been principally restricted to in situ measurements, so remote sensing techniques...
Classifying the hydrologic function of prairie potholes with remote sensing and GIS
Jennifer R. Rover, C.K. Wright, Ned H. Euliss Jr., David M. Mushet, Bruce K. Wylie
2011, Wetlands (31) 319-327
A sequence of Landsat TM/ETM+ scenes capturing the substantial surface water variations exhibited by prairie pothole wetlands over a drought to deluge period were analyzed in an attempt to determine the general hydrologic function of individual wetlands (recharge, flow-through, and discharge). Multipixel objects (water bodies) were clustered according to their...
Introduction to the featured collection on "nonstationarity, hydrologic frequency analysis, and water management"
J.E. Kiang, J.R. Olsen, R.M. Waskom
2011, Journal of the American Water Resources Association (47) 433-435
[No abstract available]...
The challenge of interpreting environmental tracer concentrations in fractured rock and carbonate aquifers
Allen M. Shapiro
2011, Hydrogeology Journal (19) 9-12
No abstract available....
Trench infiltration for managed aquifer recharge to permeable bedrock
V.M. Heilweil, D.E. Watt
2011, Hydrological Processes (25) 141-151
Managed aquifer recharge to permeable bedrock is increasingly being utilized to enhance resources and maintain sustainable groundwater development practices. One such target is the Navajo Sandstone, an extensive regional aquifer located throughout the Colorado Plateau of the western United States. Spreading-basin and bank-filtration projects along the sandstone outcrop's western edge...
A comparison of recharge rates in aquifers of the United States based on groundwater-age data
P.B. McMahon, Niel Plummer, J.K. Böhlke, S.D. Shapiro, S.R. Hinkle
2011, Hydrogeology Journal (19) 779-800
An overview is presented of existing groundwater-age data and their implications for assessing rates and timescales of recharge in selected unconfined aquifer systems of the United States. Apparent age distributions in aquifers determined from chlorofluorocarbon, sulfur hexafluoride, tritium/helium-3, and radiocarbon measurements from 565 wells in 45 networks were used to...
Rethinking hyporheic flow and transient storage to advance understanding of stream-catchment connections
Kenneth E. Bencala, M.N. Gooseff, Briant A. Kimball
2011, Water Resources Research (47)
Although surface water and groundwater are increasingly referred to as one resource, there remain environmental and ecosystem needs to study the 10 m to 1 km reach scale as one hydrologic system. Streams gain and lose water over a range of spatial and temporal scales. Large spatial scales (kilometers) have...
On the hydrologic adjustment of climate-model projections: The potential pitfall of potential evapotranspiration
P. C. D. Milly, K.A. Dunne
2011, Earth Interactions (15) 1-14
Hydrologic models often are applied to adjust projections of hydroclimatic change that come from climate models. Such adjustment includes climate-bias correction, spatial refinement ("downscaling"), and consideration of the roles of hydrologic processes that were neglected in the climate model. Described herein is a quantitative analysis of the effects of hydrologic...
Assessment of field-related influences on polychlorinated biphenyl exposures and sorbent amendment using polychaete bioassays and passive sampler measurements
E.M. Janssen, A.M. Oen, Samuel N. Luoma, R.G. Luthy
2011, Environmental Toxicology and Chemistry (30) 173-180
Field-related influences on polychlorinated biphenyl (PCB) exposure were evaluated by employing caged deposit-feeders, Neanthes arenaceodentata, along with polyoxymethylene (POM) samplers using parallel in situ and ex situ bioassays with homogenized untreated or activated carbon (AC) amended sediment. The AC amendment achieved a remedial efficiency in reducing bioaccumulation by 90% in...
Lagrangian mass-flow investigations of inorganic contaminants in wastewater-impacted streams
L. B. Barber, Ronald C. Antweiler, J.L. Flynn, S.H. Keefe, D.W. Kolpin, D.A. Roth, D.J. Schnoebelen, Howard E. Taylor, P. L. Verplanck
2011, Environmental Science & Technology (45) 2575-2583
Understanding the potential effects of increased reliance on wastewater treatment plant (WWTP) effluents to meet municipal, agricultural, and environmental flow requires an understanding of the complex chemical loading characteristics of the WWTPs and the assimilative capacity of receiving waters. Stream ecosystem effects are linked to proportions of WWTP effluent under...
A model for seasonal changes in GPS positions and seismic wave speeds due to thermoelastic and hydrologic variations
V.C. Tsai
2011, Journal of Geophysical Research B: Solid Earth (116)
It is known that GPS time series contain a seasonal variation that is not due to tectonic motions, and it has recently been shown that crustal seismic velocities may also vary seasonally. In order to explain these changes, a number of hypotheses have been given, among which thermoelastic and hydrology-induced...
Effects of humic substances on precipitation and aggregation of zinc sulfide nanoparticles
Amrika Deonarine, Boris Lau, George R. Aiken, Joseph N. Ryan, Heileen Hsu-Kim
2011, Environmental Science & Technology (45) 3217-3223
Nanoparticulate metal sulfides such as ZnS can influence the transport and bioavailability of pollutant metals in anaerobic environments. The aim of this work was to investigate how the composition of dissolved natural organic matter (NOM) influences the stability of zinc sulfide nanoparticles as they nucleate and aggregate in water with...
Rangewide phylogeography and landscape genetics of the Western U.S. endemic frog Rana boylii (Ranidae): Implications for the conservation of frogs and rivers
A.J. Lind, P.Q. Spinks, G. M. Fellers, H.B. Shaffer
2011, Conservation Genetics (12) 269-284
Genetic data are increasingly being used in conservation planning for declining species. We sampled both the ecological and distributional limits of the foothill yellow-legged frog, Rana boylii to characterize mitochondrial DNA (mtDNA) variation in this declining, riverine amphibian. We evaluated 1525 base pairs (bp) of cytochrome b and ND2 fragments...
Monitoring a large volume CO2 injection: Year two results from SECARB project at Denbury’s Cranfield, Mississippi, USA
Susan D. Hovorka, Timothy A. Meckel, Ramon H. Trevino, Jiemin Lu, Jean-Philippe Nicot, Jong-Won Choi, David Freeman, Paul Cook, Thomas M. Daley, Jonathan B. Ajo-Franklin, Barry M. Freifeild, Christine Doughty, Charles R. Carrigan, Doug La Brecque, Yousif K. Kharaka, James J. Thordsen, Tommy J. Phelps, Changbing Yang, Katherine D. Romanak, Tongwei Zhang, Robert M. Holt, Jeffery S. Lindler, Robert J. Butsch
2011, Energy Procedia (4) 3478-3485
The Southeast Regional Carbon Sequestration Partnership (SECARB) early project in western Mississippi has been testing monitoring tools and approaches to document storage efficiency and storage permanence under conditions of CO2 EOR as well as downdip injection into brine. Denbury Onshore LLC is host for the study and has brought a...
Using multi-source satellite data for lake level modelling in ungauged basins: A case study for Lake Turkana, East Africa
N.M. Velpuri, G.B. Senay, K.O. Asante
2011, Hydrology and Earth System Sciences Discussions (8) 4851-4890
Managing limited surface water resources is a great challenge in areas where ground-based data are either limited or unavailable. Direct or indirect measurements of surface water resources through remote sensing offer several advantages of monitoring in ungauged basins. A physical based hydrologic technique to monitor lake water levels in ungauged...
Effects of human-induced alteration of groundwater flow on concentrations of naturally-occurring trace elements at water-supply wells
J. D. Ayotte, Z. Szabo, M. J. Focazio, S. M. Eberts
2011, Applied Geochemistry (26) 747-762
The effects of human-induced alteration of groundwater flow patterns on concentrations of naturally-occurring trace elements were examined in five hydrologically distinct aquifer systems in the USA. Although naturally occurring, these trace elements can exceed concentrations that are considered harmful to human health. The results show that pumping-induced hydraulic gradient changes...
Calibration of models using groundwater age
Ward E. Sanford
2011, Hydrogeology Journal (19) 13-16
There have been substantial efforts recently by geochemists to determine the age of groundwater (time since water entered the system) and its uncertainty, and by hydrologists to use these data to help calibrate groundwater models. This essay discusses the calibration of models using groundwater age, with conclusions that emphasize what...
Lake carbonate-δ18 records from the Yukon Territory, Canada: Little Ice Age moisture variability and patterns
Lesleigh Anderson, Bruce P. Finney, Mark D. Shapley
2011, Quaternary Science Reviews (30) 887-898
A 1000-yr history of climate change in the central Yukon Territory, Canada, is inferred from sediment composition and isotope geochemistry from small, groundwater fed, Seven Mile Lake. Recent observations of lake-water δ18O, lake level, river discharge, and climate variations, suggest that changes in regional effective moisture (precipitation minus evaporation) are...
Seasonal variations in ectotherm growth rates: Quantifying growth as an intermittent non steady state compensatory process
J.-M. Guarini, Laurent Chauvaud, James E. Cloern, J. Clavier, J. Coston-Guarini, Y. Patry
2011, Journal of Sea Research (65) 355-361
Generally, growth rates of living organisms are considered to be at steady state, varying only under environmental forcing factors. For example, these rates may be described as a function of light for plants or organic food resources for animals and these could be regulated (or not) by temperature or other...
