Topographic controls on the chemistry of subsurface stormflow
D.L. Welsch, C.N. Kroll, Jeffery J. McDonnell, Douglas A. Burns
2001, Hydrological Processes (15) 1925-1938
Models are needed that describe how topography and other watershed characteristics affect the chemical composition of runoff waters, yet little spatially distributed data exist to develop such models. A topographically driven flushing mechanism for nitrate (NO3-) and dissolved organic carbon has been described in recent literature; however, this mechanism has...
Resistance of a lizard (the green anole, Anolis carolinensis; Polychridae) to ultraviolet radiation-induced immunosuppression
R.B. Cope, D. L. Fabacher, C. Lieske, C.A. Miller
2001, Photochemistry and Photobiology (74) 46-54
The green anole (Anolis carolinensis) is the most northerly distributed of its Neotropical genus. This lizard avoids a winter hibernation phase by the use of sun basking behaviors. Inevitably, this species is exposed to high doses of ambient solar ultraviolet radiation (UVR). Increases in terrestrial ultraviolet-B (UV-B) radiation secondary to...
Streamflow forecasting using the modular modeling system and an object-user interface
A.E. Jeton
2001, Conference Paper, Proceedings of The Western Snow Conference
The U.S. Geological Survey (USGS), in cooperation with the Bureau of Reclamation (BOR), developed a computer program to provide a general framework needed to couple disparate environmental resource models and to manage the necessary data. The Object-User Interface (OUI) is a map-based interface for models and modeling data. It provides...
Evaluation of the UnTRIM model for 3-D tidal circulation
R. T. Cheng, V. Casulli
Spaulding M.L.Spaulding M.L., editor(s)
2001, Conference Paper, Estuarine and Coastal Modeling: Proceedings of the Seventh International Conference
A family of numerical models, known as the TRIM models, shares the same modeling philosophy for solving the shallow water equations. A characteristic analysis of the shallow water equations points out that the numerical instability is controlled by the gravity wave terms in the momentum equations and by the transport...
Sinking mafic body in a reactivated lower crust: A mechanism for stress concentration at the New Madrid seismic zone
F. F. Pollitz, L. Kellogg, R. Burgmann
2001, Bulletin of the Seismological Society of America (91) 1882-1897
We propose a geodynamic model for stress concentration in the New Madrid seismic zone (NMSZ). The model postulates that a high-density (mafic) body situated in the deep crust directly beneath the most seismically active part of the NMSZ began sinking several thousands of years ago when the lower crust was...
Mitochondrial phylogeography, subspecific taxonomy, and conservation genetics of sandhill cranes (Grus canadensis; Aves: Gruidae)
J.M. Rhymer, M.G. Fain, J. E. Austin, Douglas H. Johnson, C. Krajewski
2001, Conservation Genetics (2) 203-218
Six subspecies of sandhill cranes (Grus canadensis) have been denoted based on perceived morphological and/or breeding locality differences among them. Three subspecies are migratory, breeding from the high arctic in North America and Siberia (lesser sandhill, G. c. canadensis), south through central Canada (Canadian sandhill, G. c. rowani) and into...
The crazy hollow formation (Eocene) of central Utah
M. P. Weiss, K.N. Warner
2001, Brigham Young University Geology Studies (46) 143-161
The Late Eocene Crazy Hollow Formation is a fluviatile and lacustrine unit that was deposited locally in the southwest arm of Lake Uinta during and after the last stages of the lake the deposited the Green River Formation. Most exposures of the Crazy Hollow are located in Sanpete and Sevier...
Effect of storm trajectories on snowfall chemistry in Rocky Mountain National Park, Colorado
G.P. Ingersoll, K.A. Tonnessen, K. Campbell, B.R. Glass, A.O. Torizzo
2001, Conference Paper, Proceedings of The Western Snow Conference
Snowfall samples from snowstorms lasting 1 to 4 days were collected near the Bear Lake snow telemetry (SnoTel) site in Rocky Mountain National Park, Colorado (ROMO), during the 1998-99 snowfall season to determine if storms moving in from different directions affect the chemistry of precipitation in the park. Storm pathways...
Regression models for estimating herbicide concentrations in U.S. streams from watershed characteristics
S.J. Larson, R. J. Gilliom
2001, Journal of the American Water Resources Association (37) 1349-1367
Regression models were developed for estimating stream concentrations of the herbicides alachlor, atrazine, cyanazine, metolachlor, and trifluralin from use-intensity data and watershed characteristics. Concentrations were determined from samples collected from 45 streams throughout the United States during 1993 to 1995 as part of the U.S. Geological Survey's National Water-Quality Assessment...
Source parameters for the 1952 Kern County earthquake, California: A joint inversion of leveling and triangulation observations
G.W. Bawden
2001, Journal of Geophysical Research B: Solid Earth (106) 771-785
Coseismic leveling and triangulation observations are used to determine the faulting geometry and slip distribution of the July 21, 1952, Mw 7.3 Kern County earthquake on the White Wolf fault. A singular value decomposition inversion is used to assess the ability of the geodetic network to resolve slip along a multisegment fault...
The optimal number of carboniferous series and stages
Manfred Menning, Zdzislaw Belka, Boris Chuvashov, Brian A. Engel, Peter J. Jones, Jurgen Kullmann, John Utting, Lynn Watney, Dieter Weyer
2001, Newsletters on Stratigraphy (38) 201-207
The number of global Carboniferous series and stages should be consistent with those of the neighbouring Devonian and Permian systems. Therefore, two series and seven to nine stages are preferred instead of two subsystems, seven to nine series, and 21 to 35 stages....
Hydrology of the coastal sabkhas of Abu Dhabi, United Arab Emirates
Ward E. Sanford, Warren W. Wood
2001, Hydrogeology Journal (9) 358-366
Water fluxes were estimated and a water budget developed for the land surface and a surficial 10-m-deep section of the coastal sabkhas that extend from the city of Abu Dhabi, United Arab Emirates, west to the border with Saudi Arabia. The fluxes were estimated on the basis of water levels...
The consequences of landscape change on ecological resources: An assessment of the United States mid-Atlantic region, 1973-1993
K. Bruce Jones, Anne Neale, Timothy G. Wade, James D. Wickham, Chad L. Cross, Curtis M. Edmonds, Thomas R. Loveland, Nash Maliha, Kurt H. Riitters, Elizabeth R. Smith
2001, Ecosystem Health (7) 229-242
Spatially explicit identification of changes in ecological conditions over large areas is key to targeting and prioritizing areas for environmental protection and restoration by managers at watershed, basin, and regional scales. A critical limitation to this point has been the development of methods to conduct such broad-scale assessments. Field-based methods...
Autobiographical notes or fun with field work
R. B. Clapp
2001, Atoll Research Bulletin 53-80
[No abstract available]...
Measurement of 224Ra and 226Ra activities in natural waters using a radon-in-air monitor
G. Kim, W. C. Burnett, H. Dulaiova, P.W. Swarzenski, W.S. Moore
2001, Environmental Science & Technology (35) 4680-4683
We report a simple new technique for measuring low-level radium isotopes (224Ra and 226Ra) in natural waters. The radium present in natural waters is first preconcentrated onto MnO2-coated acrylic fiber (Mn fiber) in a column mode. The radon produced from the adsorbed radium is then circulated through a closed air-loop...
Potential contribution of microbial degradation to natural attenuation of MTBE in surface water systems
P. M. Bradley, F. H. Chapelle, J. E. Landmeyer
2001, Conference Paper, ACS National Meeting Book of Abstracts
To evaluate the potential contribution of in situ biodegradation as a mechanism for natural attenuation of MTBE in surface water, surface water sediments were collected from streams and lakes at 11 sites throughout the US and the ability of the indigenous microorganisms to mineralize [U-14C] MTBE to 14CO2 under aerobic...
Renewal of tidal forests in Washington State after a subduction earthquake in A.D. 1700
B.E. Benson, B.F. Atwater, D.K. Yamaguchi, L.J. Amidon, S.L. Brown, R.C. Lewis
2001, Quaternary Research (56) 139-147
With few exceptions, today's tidal trees near Washington's Pacific coast postdate an earthquake that lowered the region by 1 m or more. The earthquake, which occurred in A.D. 1700, is the most recent to have ruptured much of the plate boundary at this central part of the Cascadia subduction zone....
Stable isotopes in seafloor hydrothermal systems: Vent fluids, hydrothermal deposits, hydrothermal alteration, and microbial processes
Wayne C. Shanks III
2001, Reviews in Mineralogy and Geochemistry (43) 468-525
The recognition of abundant and widespread hydrothermal activity and associated unique life-forms on the ocean floor is one of the great scientific discoveries of the latter half of the twentieth century. Studies of seafloor hydrothermal processes have led to revolutions in understanding fluid convection and the cooling of the ocean...
Miocene and early Pliocene epithermal gold-silver deposits in the northern Great Basin, western United States: Characteristics, distribution, and relationship to Magmatism
D. A. John
2001, Economic Geology (96) 1827-1853
Numerous important Miocene and early Pliocene epithermal Au-Ag deposits are present in the northern Great Basin. Most deposits are spatially and temporally related to two magmatic assemblages: bimodal basalt-rhyolite and western andesite. These magmatic assemblages are petrogenetic suites that reflect variations in tectonic environment of magma generation. The bimodal assemblage...
Effects of maturation-inducing hormone on heterologous gap junctional coupling in ovarian follicles of Atlantic croaker
G. Yoshizaki, R. Patino, P. Thomas, D. Bolamba, Xiaotian Chang
2001, General and Comparative Endocrinology (124) 359-366
A previous ultrastructural study of heterologous (granulosa cell-oocyte) gap junction (GJ) contacts in ovarian follicles of Atlantic croaker suggested that these contacts disappear late during the process of resumption of oocyte meiosis. This observation suggested that, unlike scenarios proposed for a number of other species, uncoupling of GJ is not...
Holocene lake-level fluctuations of Lake Aricota, Southern Peru
C. Placzek, Jay Quade, J.L. Betancourt
2001, Quaternary Research (56) 181-190
Lacustrine deposits exposed around Lake Aricota, Peru (17?? 22???S), a 7.5-km2 lake dammed by debris flows, provide a middle to late Holocene record of lake-level fluctuations. Chronological context for shoreline deposits was obtained from radiocarbon dating of vascular plant remains and other datable material with minimal 14C reservoir effects (<350...
El Niño and its impact on fire weather conditions in Alaska
Jason C. Hess, Carven A. Scott, Gary L. Hufford, Michael D. Fleming
2001, International Journal of Wildland Fire (10) 1-13
Examining the relationship of El Niño to weather patterns in Alaska shows wide climate variances that depend on the teleconnection between the tropics and the northern latitudes. However, the weather patterns exhibited in Alaska during and just after moderate to strong El Niño episodes are generally consistent: above normal temperature...
Stock structure of sea otters (Enhydra lutris kenyoni) in Alaska
C.S. Gorbics, James L. Bodkin
2001, Marine Mammal Science (17) 632-647
Sea otters in Alaska are recognized as a single subspecies (Enhydra lutris kenyoni) and currently managed as a single, interbreeding population. However, geographic and behavioral mechanisms undoubrably constrain sea otter movements on much smaller scales. This paper applies the phylogeographic method (Dizon et al. 1992) and considers distribution, population response, phenotype...
Alaska: A twenty-first-century petroleum province
Kenneth J. Bird
2001, AAPG Memoir (74) 137-165
Alaska, the least explored of all United States regions, is estimated to contain approximately 40% of total U.S. undiscovered, technically recoverable oil and natural-gas resources, based on the most recent U.S. Department of the Interior (U.S. Geological Survey and Minerals Management Service) estimates. Northern Alaska, including the North Slope and...
Effect of redox conditions on MTBE biodegradation in surface water Sediments
P. M. Bradley, F. H. Chapelle, J. E. Landmeyer
2001, Environmental Science & Technology (35) 4643-4647
Microbial degradation of methyl tert-butyl ether (MTBE) was observed in surface water-sediment microcosms under anaerobic conditions. The efficiency and products of anaerobic MTBE biodegradation were dependent on the predominant terminal electron-accepting conditions. In the presence of substantial methanogenic activity, MTBE biodegradation was nominal and involved reduction of MTBE to the...
