Comment on "Evaluating interactions between groundwater and vadose zone using the HYDRUS-based flow package for MODFLOW" by Navin Kumar C. Twarakavi, Jirka Šimůnek and Sophia Seo
R.G. Niswonger, David E. Prudic
2009, Vadose Zone Journal (8) 818-819
Twarakavi et al (2008) compared four packages that can be used to estimate recharge for regional-scale groundwater flow simulations using MODFLOW (Harbaugh, 2005). This comment is focused on the comparisons made between two of these packages, namely, UZF1 (Niswonger et al., 2006) and a derivative of HYDRUS referred to herein...
Erosional history of Cape Halkett and contemporary monitoring of bluff retreat, Beaufort Sea coast, Alaska
Benjamin M. Jones, Christopher D. Arp, Richard A. Beck, Guido Grosse, James M. Webster, Frank E. Urban
2009, Polar Geography (32) 129-142
Cape Halkett is located along the Beaufort Sea at the end of a low-lying tundra landscape. The area has been subject to major modifications over the last century as a result of erosion and migration of the coastline inland. Long-term mean annual erosion rates (1955-2009) for the entire cape are...
Impacts of settlement, damming, and hydromanagement in two boreal lakes: A comparative paleolimnological study
C.A. Serieyssol, M.B. Edlund, L.W. Kallemeyn
2009, Journal of Paleolimnology (42) 497-513
Namakan Lake, located in shared border waters in northeastern Minnesota and northwestern Ontario, was subjected to several anthropogenic impacts including logging, damming, water-level manipulations, and perhaps climate change. We used paleolimnology to determine how these stressors impacted Namakan Lake in comparison to a control lake (Lac La Croix) that was...
Suggested notation conventions for rotational seismology
J.R. Evans
2009, Bulletin of the Seismological Society of America (99) 1073-1075
We note substantial inconsistency among authors discussing rotational motions observed with inertial seismic sensors (and much more so in the broader topic of rotational phenomena). Working from physics and other precedents, we propose standard terminology and a preferred reference frame for inertial sensors (Fig. 1) that may be consistently used...
Recommendations for control of pathogens and infectious diseases in fish research facilities
M.L. Kent, S.W. Feist, C. Harper, S. Hoogstraten-Miller, J.M. Law, J. M. Sanchez-Morgado, R.L. Tanguay, G.E. Sanders, J.M. Spitsbergen, Christopher M. Whipps
2009, Comparative Biochemistry and Physiology, Part C: Toxicology & Pharmacology (149) 240-248
Concerns about infectious diseases in fish used for research have risen along with the dramatic increase in the use of fish as models in biomedical research. In addition to acute diseases causing severe morbidity and mortality, underlying chronic conditions that cause low-grade or subclinical infections may confound research results. Here...
A preliminary study of older hot spring alteration in Sevenmile Hole, Grand Canyon of the Yellowstone River, Yellowstone Caldera, Wyoming
Peter B. Larson, Allison Phillips, David A. John, Michael A. Cosca, Chad Pritchard, Allen K. Andersen, Jennifer Manion
2009, Journal of Volcanology and Geothermal Research (188) 225-236
Erosion in the Grand Canyon of the Yellowstone River, Yellowstone Caldera (640 ka), Wyoming, has exposed a cross section of older hydrothermal alteration in the canyon walls. The altered outcrops of the post-collapse tuff of Sulphur Creek (480 ka) extend from the canyon rim to more than 300 m beneath it. The hydrothermal...
Factors associated with arrival densities of grasshopper sparrow (Ammodramus savannarum) and baird's sparrow (A. bairdii) in the upper great plains
M.A. Ahlering, Douglas H. Johnson, John Faaborg
2009, The Auk (126) 799-808
Although critical to habitat and population management, the proximate cues that birds use to establish territories are largely unknown. Understanding these cues is important for birds, such as many grassland birds, that exhibit high annual variability in population density and make new habitat-selection decisions annually. Identifying the actual cues used...
Rocky Mountain evolution: Tying Continental Dynamics of the Rocky Mountains and Deep Probe seismic experiments with receiver functions
E.-M. Rumpfhuber, Gordon R. Keller, E. Sandvol, A.A. Velasco, D.C. Wilson
2009, Journal of Geophysical Research B: Solid Earth (114)
In this study, we have determined the crustal structure using three different receiver function methods using data collected from the northern transect of the Continental Dynamics of the Rocky Mountains (CD-ROM) experiment. The resulting migrated image and crustal thickness determinations confirm and refine prior crustal thickness measurements based on the...
Impacts of experimentally increased foraging effort on the family: offspring sex matters
Ann Harding, Alexander S. Kitaysky, Keith C. Hamer, Margaret E. Hall, Jorg Welcker, Sandra L. Talbot, Nina J. Karnovsky, Geir W. Gabrielsen, David Gremillet
2009, Animal Behaviour (78) 321-328
We examined how short-term impacts of experimentally increased foraging effort by one parent reverberate around the family in a monomorphic seabird (little auk, Alle alle), and whether these effects depend on offspring sex. In many species, more effort is required to rear sons successfully than daughters. However, undernourishment may have...
Characterization of the Helderberg Group as a geologic seal for CO 2 sequestration
J.E. Lewis, R.R. McDowell, K.L. Avary, K.M. Carter
2009, Environmental Geosciences (16) 201-210
The Midwest Regional Carbon Sequestration Partnership recognizes that both the Devonian Oriskany Sandstone and the Silurian Salina Group offer potential for subsurface carbon dioxide storage in northern West Virginia. The Silurian-Devonian Helderberg Group lies stratigraphically between these two units, and consequendy, its potential as a geologic seal must be evaluated....
Utilization by fishes of the Alviso Island ponds and adjacent waters in south san francisco bay following restoration to tidal influence
M. K. Saiki, F.H. Mejia
2009, California Fish and Game (95) 38-52
Earthen levees of three isolated salt ponds known locally as the Alviso Island Ponds were intentionally breached in March 2006 to allow tidal exchange of the ponds with water from Coyote Creek. The water exchange transformed the previously fishless hypersaline ponds into lower salinity habitats suitable for fish life. This...
Late Pleistocene Sea level on the New Jersey Margin: Implications to eustasy and deep-sea temperature
J.D. Wright, R. E. Sheridan, K.G. Miller, J. Uptegrove, B.S. Cramer, J.V. Browning
2009, Global and Planetary Change (66) 93-99
We assembled and dated a late Pleistocene sea-level record based on sequence stratigraphy from the New Jersey margin and compared it with published records from fossil uplifted coral reefs in New Guinea, Barbados, and Araki Island, as well as a composite sea-level estimate from scaling of Red Sea isotopic values....
Hierarchical spatial genetic structure of Common Eiders (Somateria mollissima) breeding along a migratory corridor
Sarah A. Sonsthagen, Sandra L. Talbot, Richard B. Lanctot, Kim T. Scribner, Kevin G. McCracken
2009, The Auk (126) 744-754
Documentation of spatial genetic discordance among breeding populations of Arctic-nesting avian species is important, because anthropogenic change is altering environmental linkages at micro- and macrogeographic scales. We estimated levels of population subdivision within Pacific Common Eiders (Somateria mollissima v-nigrum) breeding on 12 barrier islands in the western...
Genesis of the Assif El Mal Zn-Pb (Cu, Ag) vein deposit. An extension-related Mesozoic vein system in the High Atlas of Morocco. Structural, mineralogical, and geochemical evidence
M. Bouabdellah, G. Beaudoin, D. L. Leach, F. Grandia, E. Cardellach
2009, Mineralium Deposita (44) 689-704
The Assif El Mal Zn-Pb (Cu-Ag) vein system, located in the northern flank of the High Atlas of Marrakech (Morocco), is hosted in a Cambro-Ordovician volcaniclastic and metasedimentary sequence composed of graywacke, siltstone, pelite, and shale interlayered with minor tuff and mudstone. Intrusion of synorogenic to postorogenic Late Hercynian peraluminous...
Approximation to cutoffs of higher modes of Rayleigh waves for a layered earth model
Y. Xu, J. Xia, R. D. Miller
2009, Pure and Applied Geophysics (166) 339-351
A cutoff defines the long-period termination of a Rayleigh-wave higher mode and, therefore is a key characteristic of higher mode energy relationship to several material properties of the subsurface. Cutoffs have been used to estimate the shear-wave velocity of an underlying half space of a layered earth model. In this...
Neotectonic analysis of upper klamath lake, oregon: New insights from seismic reflection data
L.M. Liberty, T. L. Pratt, M. Lyle, I. P. Madin
2009, Special Paper of the Geological Society of America 71-82
We present marine high-resolution seismic reflection data from Upper Klamath Lake, Oregon, to discern the underlying structure and estimate Quaternary slip rates in this actively extending Basin and Range system. The sediment patterns and structures imaged on our seismic profiles reveal a complex geologic system that reflects a changing climate...
Geomorphology, stability and mobility of the Currituck slide
J. Locat, H. Lee, Uri S. ten Brink, D. Twichell, E. Geist, M. Sansoucy
2009, Marine Geology (264) 28-40
Over the last 100,000??years, the U.S. Atlantic continental margin has experienced various types of mass movements some of which are believed to have taken place at times of low sea level. At one of these times of low sea level a significant trigger caused a major submarine mass movement off...
Monitoring urban subsidence based on SAR lnterferometric point target analysis
Y. Zhang, Jiahua Zhang, W. Gong, Z. Lu
2009, Acta Geodaetica et Cartographica Sinica (38) 482-493
lnterferometric point target analysis (IPTA) is one of the latest developments in radar interferometric processing. It is achieved by analysis of the interferometric phases of some individual point targets, which are discrete and present temporarily stable backscattering characteristics, in long temporal series of interferometric SAR images. This paper analyzes the...
Investigating aquatic ecosystems of small lakes in Khorezm, Uzbekistan
L. Saito, J. Scott, M. Rosen, Bakhriddin Nishonov, S. Chandra, John P.A. Lamers, Dilorom Fayzieva, M. Shanafield
2009, Conference Paper, Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
The Khorezm province of Uzbekistan, located in the Aral Sea Basin, suffers from severe environmental and human health problems due to decades of unsustainable land and water management. Agriculture is the dominant land use in Khorezm, and agricultural runoff water has impacted many small lakes. In this water-scarce region, these...
Reservoir uncertainty, Precambrian topography, and carbon sequestration in the Mt. Simon Sandstone, Illinois Basin
H.E. Leetaru, J.H. McBride
2009, Environmental Geosciences (16) 235-243
Sequestration sites are evaluated by studying the local geological structure and confirming the presence of both a reservoir facies and an impermeable seal not breached by significant faulting. The Cambrian Mt. Simon Sandstone is a blanket sandstone that underlies large parts of Midwest United States and is this region's most...
Quantifying ecological, morphological, and genetic variation to delimit species in the coast horned lizard species complex (Phrynosoma)
A.D. Leache, M.S. Koo, C.L. Spencer, T.J. Papenfuss, Robert N. Fisher, J.A. McGuire
2009, Proceedings of the National Academy of Sciences of the United States of America (106) 12418-12423
Lineage separation and divergence form a temporally extended process whereby populations may diverge genetically, morphologically, or ecologically, and these contingent properties of species provide the operational criteria necessary for species delimitation.We inferred the historical process of lineage formation in the coast horned lizard (Phrynosoma coronatum) species complex by evaluating a...
Joint spatiotemporal variability of global sea surface temperatures and global Palmer drought severity index values
S. Apipattanavis, G.J. McCabe, B. Rajagopalan, S. Gangopadhyay
2009, Journal of Climate (22) 6251-6267
Dominant modes of individual and joint variability in global sea surface temperatures (SST) and global Palmer drought severity index (PDSI) values for the twentieth century are identified through a multivariate frequency domain singular value decomposition. This analysis indicates that a secular trend and variability related to the El Niño–Southern Oscillation...
Microbial abundance in the deep subsurface of the Chesapeake Bay impact crater: Relationship to lithology and impact processes
Charles S. Cockell, Aaron L. Gronstal, Mary A. Voytek, Julie D. Kirshtein, Kai Finster, Ward E. Sanford, Mihaela Glamoclija, Gregroy S. Gohn, David S. Powars, J. Wright Horton Jr.
2009, GSA Special Papers (458) 941-950
Asteroid and comet impact events are known to cause profound disruption to surface ecosystems. The aseptic collection of samples throughout a 1.76-km-deep set of cores recovered from the deep subsurface of the Chesapeake Bay impact structure has allowed the study of the subsurface biosphere in a region disrupted by an...
Prevalence of West Nile virus in migratory birds during spring and fall migration
Robert J. Dusek, R. G. McLean, L.D. Kramer, S. R. Ubico, A.P. Dupuis II, G.D. Ebel, S.C. Guptill
2009, American Journal of Tropical Medicine and Hygiene (81) 1151-1158
To investigate the role of migratory birds in the dissemination of West Nile virus (WNV), we measured the prevalence of infectious WNV and specific WNV neutralizing antibodies in birds, principally Passeriformes, during spring and fall migrations in the Atlantic and Mississippi flyways from 2001-2003. Blood samples were obtained from 13,403...
A national look at carbon capture and storage-National carbon sequestration database and geographical information system (NatCarb)
T.R. Carr, A. Iqbal, N. Callaghan, Dana-Adkins-Heljeson, K. Look, S. Saving, K. Nelson
2009, Conference Paper, Energy Procedia
The US Department of Energy's Regional Carbon Sequestration Partnerships (RCSPs) are responsible for generating geospatial data for the maps displayed in the Carbon Sequestration Atlas of the United States and Canada. Key geospatial data (carbon sources, potential storage sites, transportation, land use, etc.) are required for the Atlas, and for...
