Composition and origin of rhyolite melt intersected by drilling in the Krafla geothermal field, Iceland
R.A. Zierenberg, Peter Schiffmant, G.H. Barfod, C.E. Lesher, N.E. Marks, Jacob B. Lowenstern, A.K. Mortensen, E.C. Pope, D.K. Bird, M.H. Reed, G.O. Fridleifsson, W.A. Elders
2013, Contributions to Mineralogy and Petrology (165) 327-347
The Iceland Deep Drilling Project Well 1 was designed as a 4- to 5-km-deep exploration well with the goal of intercepting supercritical hydrothermal fluids in the Krafla geothermal field, Iceland. The well unexpectedly drilled into a high-silica (76.5 % SiO2) rhyolite melt at approximately 2.1 km. Some of the melt...
Implications of the miocene(?) crooked ridge river of northern arizona for the evolution of the colorado river and grand canyon
Ivo Lucchitta, Richard F. Holm, Baerbel K. Lucchitta
2013, Geosphere (9) 1417-1433
The southwesterly course of the probably pre–early Miocene and possibly Oligocene Crooked Ridge River can be traced continuously for 48 km and discontinuously for 91 km in northern Arizona (United States). The course is visible today in inverted relief. Pebbles in the river gravel came from at least as far...
Classification of freshwater ice conditions on the Alaskan Arctic Coastal Plain using ground penetrating radar and TerraSAR-X satellite data
Benjamin M. Jones, Alessio Gusmeroli, Christopher D. Arp, Tazio Strozzi, Guido Grosse, Benjamin V. Gaglioti, Matthew S. Whitman
2013, International Journal of Remote Sensing (34) 8267-8279
Arctic freshwater ecosystems have responded rapidly to climatic changes over the last half century. Lakes and rivers are experiencing a thinning of the seasonal ice cover, which may increase potential over-wintering freshwater habitat, winter water supply for industrial withdrawal, and permafrost degradation. Here, we combined the use of ground penetrating...
Effects of dreissenids on monitoring and management of fisheries in western Lake Erie
Martin A. Stapanian, Patrick M. Kocovsky
2013, Book chapter, Quagga and zebra mussels: biology, impacts, and control
Water clarity increased in nearshore areas of western Lake Erie by the early-1990s mainly as a result of the filtering activities of dreissenid mussels (Dreissena spp.), which invaded in the mid-1980s. We hypothesized that increased water clarity would result in greater trawl avoidance and thus reduced ability to capture fish...
Geographic setting influences Great Lakes beach microbiological water quality
Sheridan K. Haack, Lisa R. Fogarty, Erin A. Stelzer, Lori M. Fuller, Angela K. Brennan, Natasha M. Isaacs, Heather E. Johnson
2013, Environmental Science & Technology (47) 12054-12063
Understanding of factors that influence Escherichia coli (EC) and enterococci (ENT) concentrations, pathogen occurrence, and microbial sources at Great Lakes beaches comes largely from individual beach studies. Using 12 representative beaches, we tested enrichment cultures from 273 beach water and 22 tributary samples for EC, ENT, and genes indicating the...
Variability and trends in irrigated and non-irrigated croplands in the central U.S
Jesslyn F. Brown, Md Shahriar Pervez
2013, Conference Paper, Information for sustainable agriculture, International Conference on Agro-Geoinformatics, 2nd, Fairfax, Va., 12–16 August 2013, Proceedings
Over 23 million hectares (233 thousand km2) of U.S. croplands are irrigated and there was an overall net expansion of 522 thousand hectares nationally from 2002 to 2007. Most of this expansion occurred across the High Plains Aquifer (HPA) in the central Great Plains. Until recently, there has been a...
Statistical mapping of zones of focused groundwater/surface-water exchange using fiber-optic distributed temperature sensing
Kisa Mwakanyamale, Frederick D. Day-Lewis, Lee D. Slater
2013, Water Resources Research (49) 6979-6984
Fiber-optic distributed temperature sensing (FO-DTS) increasingly is used to map zones of focused groundwater/surface-water exchange (GWSWE). Previous studies of GWSWE using FO-DTS involved identification of zones of focused GWSWE based on arbitrary cutoffs of FO-DTS time-series statistics (e.g., variance, cross-correlation between temperature and stage, or spectral power). New approaches are...
Recent changes in successional state of the deep-water fish communities of Lakes Michigan, Huron, and Ontario and management implications
Randy L. Eshenroder, Brian F. Lantry
William W. Taylor, Abigail Lynch, Nancy J. Leonard, editor(s)
2013, Book chapter, Great Lakes fisheries policy and management: A binational perspective
No abstract available....
It's time for bold new approaches to link delta science and policymaking
James E. Cloern, Ellen Hanak
2013, San Francisco Estuary and Watershed Science (11)
California’s Sacramento–San Joaquin Delta is widely recognized as a highly damaged ecosystem. The Delta is also emblematic of a growing sense worldwide that society needs to do a better job of using scientific knowledge to guide conservation and resource management policies. Fortunately, we now have an unprecedented opportunity to get it right in building...
Temporal, spatial, and body size effects on growth rates of loggerhead sea turtles (Caretta caretta) in the Northwest Atlantic
Karen A. Bjorndal, Barbara A. Schroeder, Allen M. Foley, Blair E. Witherington, Michael Bresette, David Clark, Richard M. Herren, Michael D. Arendt, Jeffrey R. Schmid, Anne B. Meylan, Peter A. Meylan, Jane A. Provancha, Kristen M. Hart, Margaret M. Lamont, Raymond R. Carthy, Alan B. Bolten
2013, Marine Biology (160) 2711-2721
In response to a call from the US National Research Council for research programs to combine their data to improve sea turtle population assessments, we analyzed somatic growth data for Northwest Atlantic (NWA) loggerhead sea turtles (Caretta caretta) from 10 research programs. We assessed growth dynamics over wide ranges of...
Seasonal persistence of marine-derived nutrients in south-central Alaskan salmon streams
Daniel J. Rinella, Mark S. Wipfi, Coowe M. Walker, Craig A. Stricker, Ron A. Heintz
2013, Ecosphere (4)
Spawning salmon deliver annual pulses of marine-derived nutrients (MDN) to riverine ecosystems around the Pacific Rim, leading to increased growth and condition in aquatic and riparian biota. The influence of pulsed resources may last for extended periods of time when recipient food webs have effective storage mechanisms, yet few studies...
Characterizing and estimating noise in InSAR and InSAR time series with MODIS
William D. Barnhart, Rowena B. Lohman
2013, Geochemistry, Geophysics, Geosystems (14) 4121-4132
InSAR time series analysis is increasingly used to image subcentimeter displacement rates of the ground surface. The precision of InSAR observations is often affected by several noise sources, including spatially correlated noise from the turbulent atmosphere. Under ideal scenarios, InSAR time series techniques can substantially mitigate these effects; however, in...
Links between climate change, water-table depth, and water chemistry in a mineralized mountain watershed
Andrew H. Manning, Philip L. Verplanck, Jonathan S. Caine, Andrew S. Todd
2013, Applied Geochemistry (37) 64-78
Recent studies suggest that climate change is causing rising solute concentrations in mountain lakes and streams. These changes may be more pronounced in mineralized watersheds due to the sensitivity of sulfide weathering to changes in subsurface oxygen transport. Specific causal mechanisms linking climate change and accelerated weathering rates have been...
Social-ecological predictors of global invasions and extinctions
Aaron Lotz, Craig R. Allen
2013, Ecology and Society (18)
Most assessments of resilience have been focused on local conditions. Studies focused on the relationship between humanity and environmental degradation are rare, and are rarely comprehensive. We investigated multiple social-ecological factors for 100 countries around the globe in relation to the percentage of invasions and extinctions within each country. These...
Evaluation of potential gas clogging associated with managed aquifer recharge from a spreading basin, southwestern Utah, U.S.A.
Victor M. Heilweil, Thomas Marston
2013, Book chapter, Clogging issues associated with managed aquifer recharge methods
Sand Hollow Reservoir in southwestern Utah, USA, is operated for both surface-water storage and managed aquifer recharge via infiltration from surface basin spreading to the underlying Navajo Sandstone. The total volume of estimated recharge from 2002 through 2011 was 131 Mm3., resulting in groundwater levels rising as much as 40...
Prescribed-fire effects on an aquatic community of a southwest montane grassland system
Colleen A. Caldwell, Gerald Z. Jacobi, Michael C. Anderson, Robert R. Parmenter, Jeanine McGann, William R. Gould, Robert DuBey, M. Donna Jacobi
2013, North American Journal of Fisheries Management (33) 1049-1062
The use of prescription fire has long been recognized as a reliable management tool to suppress vegetative succession processes and to reduce fuel loading to prevent catastrophic wildfires, but very little attention has been paid to the effects on aquatic systems. A late-fall prescribed burn was implemented to characterize effects...
Development of a reproducible method for determining quantity of water and its configuration in a marsh landscape
Glenn M. Suir, D. Elaine Evers, Gregory D. Steyer, Charles E. Sasser
2013, Journal of Coastal Research 110-117
Coastal Louisiana is a dynamic and ever-changing landscape. From 1956 to 2010, over 3,734 km2 of Louisiana's coastal wetlands have been lost due to a combination of natural and human-induced activities. The resulting landscape constitutes a mosaic of conditions from highly deteriorated to relatively stable with intact landmasses. Understanding how...
Normalized rare earth elements in water, sediments, and wine: identifying sources and environmental redox conditions
David Z. Piper, Michael Bau
2013, American Journal of Analytical Chemistry (4) 69-83
The concentrations of the rare earth elements (REE) in surface waters and sediments, when normalized on an element-by-element basis to one of several rock standards and plotted versus atomic number, yield curves that reveal their partitioning between different sediment fractions and the sources of those fractions, for example, between terrestrial-derived...
Global change and water availability and quality: Challenges ahead
Matthew C. Larsen
Satinder Ahuja, editor(s)
2013, Book chapter, Comprehensive water quality and purification
The US is in the midst of a continental scale, multiyear water resources experiment. What are we doing? We are expanding population at two to three times the national growth rate, particularly where water stress is already great. We are expanding irrigated agriculture from the west to the east, where...
Temporal dynamics of biogeochemical processes at the Norman Landfill site
Bhavna Arora, Binayak P. Mohanty, Jennifer T. McGuire, Isabelle M. Cozzarelli
2013, Water Resources Research (49) 6909-6926
The temporal variability observed in redox sensitive species in groundwater can be attributed to coupled hydrological, geochemical, and microbial processes. These controlling processes are typically nonstationary, and distributed across various time scales. Therefore, the purpose of this study is to investigate biogeochemical data sets from a municipal landfill site to...
Effect of correlated observation error on parameters, predictions, and uncertainty
Claire R. Tiedeman, Christopher T. Green
2013, Water Resources Research (49) 6339-6355
Correlations among observation errors are typically omitted when calculating observation weights for model calibration by inverse methods. We explore the effects of omitting these correlations on estimates of parameters, predictions, and uncertainties. First, we develop a new analytical expression for the difference in parameter variance estimated with and without error...
Influence of dissolved organic matter character on mercury incorporation by planktonic organisms: an experimental study using oligotrophic water from Patagonian lakes
Maria C. Dieguez, Claudia P. Queimalinos, Sergio Ribeiro Guevara, Mark C. Marvin-DiPasquale, Carolina Soto Cardenas, Maria A. Arribere
2013, Journal of Environmental Sciences (25) 1980-1991
Ligands present in dissolved organic matter (DOM) form complexes with inorganic divalent mercury (Hg2+) affecting its bioavailability in pelagic food webs. This investigation addresses the influence of a natural gradient of DOM present in Patagonian lakes on the bioaccumulation of Hg2+ (the prevailing mercury species in the water column of...
Photometric properties of Mars soils analogs
A. Pommerol, N. Thomas, B. Jost, P. Beck, C. Okubo, A. S. McEwen
2013, Journal of Geophysical Research E: Planets (118) 2045-2072
We have measured the bidirectional reflectance of analogs of dry, wet, and frozen Martian soils over a wide range of phase angles in the visible spectral range. All samples were produced from two geologic samples: the standard JSC Mars-1 soil simulant and Hawaiian basaltic sand. In a first step, experiments...
Degree-day accumulation influences annual variability in growth of age-0 walleye
Christopher S. Uphoff, Casey W. Schoenebeck, W. Wyatt Hoback, Keith D. Koupal, Kevin L. Pope
2013, Fisheries Research (147) 394-398
The growth of age-0 fishes influences survival, especially in temperate regions where size-dependent over-winter mortality can be substantial. Additional benefits of earlier maturation and greater fecundity may exist for faster growing individuals. This study correlated prey densities, growing-degree days, water-surface elevation, turbidity, and chlorophyll a with age-0 walleye Sander vitreus...
Runoff-generated debris flows: observations and modeling of surge initiation, magnitude, and frequency
Jason W. Kean, Scott W. McCoy, Gregory E. Tucker, Dennis M. Staley, Jeffrey A. Coe
2013, Journal of Geophysical Research F: Earth Surface (118) 2190-2207
Runoff during intense rainstorms plays a major role in generating debris flows in many alpine areas and burned steeplands. Yet compared to debris flow initiation from shallow landslides, the mechanics by which runoff generates a debris flow are less understood. To better understand debris flow initiation by surface water runoff,...
