Use of a regional atmospheric model to simulate lake-atmosphere feedbacks associated with Pleistocene Lakes Lahontan and Bonneville
S. W. Hostetler, F. Giorgi
1992, Climate Dynamics (7) 39-44
A regional model of the atmosphere (version 4 of the NCAR mesoscale model, MM4) was used to assess whether lake-effect precipitation was a significant component of the late-Pleistocene hydrologic budgets of Lakes Lahontan and Bonneville. Control simulations for January and July of 1979 were made using MM4, and the Pleistocene...
The study of the undiscovered mineral resources of the Tongass National Forest and adjacent lands, Southeastern Alaska
D. A. Brew, L.J. Drew, S. D. Ludington
1992, Nonrenewable Resources (1) 303-322
The quantitative probabilistic assessment of the undiscovered mineral resources of the 17.1-million-acre Tongass National Forest (the largest in the United States) and its adjacent lands is a nonaggregated, mineral-resource-tract-oriented assessment designed for land-planning purposes. As such, it includes the renewed use of gross-in-place values (GIPV's) in dollars of the estimated...
Holocene depocenter migration and sediment accumulation in Delaware Bay: A submerging marginal marine sedimentary basin
C.H. Fletcher III, H.J. Knebel, J.C. Kraft
1992, Marine Geology (103) 165-183
The Holocene transgression of the Delaware Bay estuary and adjacent Atlantic coast results from the combined effect of regional crustal subsidence and eustasy. Together, the estuary and ocean coast constitute a small sedimentary basin whose principal depocenter has migrated with the transgression. A millenial time series of isopach and paleogeographic...
Preliminary evidence for the involvement of budding bacteria in the origin of Alaskan placer gold
J.R. Watterson
1992, Geology (20) 315-318
Lacelike networks of micrometre-size filiform gold associated with Alaskan placer gold particles are interpreted as low-temperature pseudomorphs of a Pedomicrobium-like budding bacterium. Submicron reproductive structures (hyphae) and other morphological features similar to those of Pedomicrobiummanganicum occur as detailed three-dimensional facsimiles in high-purity gold in and on...
Two-dimensional circulation modeling of the Pamlico River estuary, North Carolina
G. L. Giese, Jerad Bales
1992, Conference Paper
A two dimensional, vertically averaged, unsteady flow model was applied to a 50- kilometer reach of the Pamlico River estuary, North Carolina. The model computational grid, which consists of about 16,000 square cells, each 200 meters on a side, was developed from more than one million depth soundings. Information from...
Paleodrainages of the Eastern Sahara: the Nile problem and its relevance to the Chad Basin
H. Faure, C. S. Breed, J.F. McCauley
1992, Journal of African Earth Sciences (14) 153-154
No abstract available....
The San Andreas Fault System, California, USA
R.D. Brown, R. E. Wallace, D.P. Hill
1992, Annales Tectonicae (6) 261-284
Geologists, seismologists, and geophysicists have intensively studied the San Andreas fault system for the past 20 to 30 years. Their goals were to learn more about damaging earthquakes, the behavior of major stirke-slip faults, and methods of reducing earthquake hazards in populated areas. Field geologic investigations, seismic networks, post-earthquake studies,...
Geology of the Eel River basin and adjacent region: Implications for late Cenozoic tectonics of the southern Cascadia subduction zone and Mendocino triple junction
S. H. Clarke Jr.
1992, American Association of Petroleum Geologists Bulletin (76) 199-224
Two upper Cenozoic depositional sequences of principally marine strata about 4000m thick overlie accreted basement terranes of the Central and Coastal belts of the Franciscan Complex in the onshore-offshore Eel River basin of northwestern California. The older depositional sequence is early to middle Miocene in age and represents slope basin...
Trophic interactions and direct physical effects control phytoplankton biomass and production in an estuary
A.E. Alpine, J. E. Cloern
1992, Limnology and Oceanography (37) 946-955
San Francisco Bay has recently been invaded by the suspension-feeding clam Potamocorbula amurensis. Previous work has shown that phytoplankton biomass in the upper estuary is low (2-3 mg Chl a m-3) during seasonal periods of high river flow and short residence time and it is usually high (peak >30 mg...
Dynamics of soil carbon during deglaciation of the Laurentide Ice Sheet
Jennifer W. Harden, R. K. Mark, E.T. Sundquist, R.F. Stallard
1992, Science (258) 1921-1924
Deglaciation of the Laurentide Ice Sheet in North America was accompanied by sequestration of organic carbon in newly exposed soils. The greatest rate of land exposure occurred around 12,000 to 8,000 years ago, and the greatest increase in the rate of carbon sequestration by soils occurred from 8,000 to 4,000...
The extent of temporal smearing in surface-temperature histories derived from borehole temperature measurements
Gary D. Clow
1992, Global and Planetary Change (6) 81-86
The ability of borehole temperature data to resolve past climatic events is investigated using Backus-Gilbert inversion methods. Two experimental approaches are considered: (1) the data consist of a single borehole temperature profile, and (2) the data consist of climatically-induced temperature transients measured within a borehole during a monitoring experiment. The...
Using soil gas radon and geology to estimate regional radon potential
G.M. Reimer
1992, Conference Paper, Radiation Protection Dosimetry
Two important parameters have been identified in order to estimate the radon potential of a region. They are the soil gas radon concentration and the geological rock type from which soils are derived. A simple soil gas collection and analytical technique has been developed to provide information on soil gas...
Late Quaternary environments in Ruby Valley, Nevada
R.S. Thompson
1992, Quaternary Research (37) 1-15
Palynological data from sediment cores from the Ruby Marshes provide a record of environmental and climatic changes over the last 40,000 yr. The modern marsh waters are fresh, but no deeper than ???3 m. A shallow saline lake occupied this basin during the middle Wisconsin, followed by fresh and perhaps...
Radiocarbon dating of groundwater in a confined aquifer in southeast Arizona
F. N. Robertson
1992, Radiocarbon (34) 664-676
Radiocarbon, δ13C and major-element data were used to construct a geochemical framework for interpretation of the hydrological flow system in the lower San Pedro basin, southeastern Arizona, USA. The 14C and major-element data show a regional confined aquifer that extends throughout most of the basin. Groundwater ages, after correcting...
Tide- and wind-driven flushing of Boston Harbor, Massachusetts
Richard Signell
1992, Conference Paper
The flushing of Boston Harbor, a shallow, tidally dominated embayment with little fresh water input, is investigated using a depth-averaged model. The modeled tidal currents exhibit strong spatial variability and ebb/flood asymmetry due to complex topography and coastline geometry and were verified by shipboard acoustic Doppler current profiler measurements. At...
Selenium and sulfur relationships in alfalfa and soil under field conditions, San Joaquin Valley, California
R. C. Severson, L. P. Gough
1992, Journal of Environmental Quality (21) 353-358
Relationships between total Se and S or soluble SeO4 and SO4 in soils and tissue concentrations in alfalfa (Medicago sativa L.), under field conditions in the San Joaquin Valley of California, suggest that the rate of accumulation of Se in alfalfa may be reduced in areas where high Se...
Metallogeny of the midcontinent rift system of North America
S. W. Nicholson, W.F. Cannon, K. J. Schulz
1992, Precambrian Research (58) 355-386
The 1.1 Ga Midcontinent rift system of North America is one of the world's major continental rifts and hosts a variety of mineral deposits. The rocks and mineral deposits of this 2000 km long rift are exposed only in the Lake Superior region. In the Lake Superior region, the...
Use of D-C resistivity to map saline ground water
Christina L. Stamos, Steven K. Predmore, Adel A. R. Zohdy
1992, Book, Irrigation and Drainage: Saving a Threatened Resource - In Search of Solutions, Proceedings of the Irrigation and Drainage Sessions at Water Forum '92
It has been estimated in previous studies that 23 square miles of the Oxnard aquifer, a member of a multi-layered aquifer system beneath the Oxnard plain in Ventura County, California, has been contaminated as a result of seawater intrusion. To investigate this and other potential sources of saline water, a...
Ground-water models cannot be validated
Leonard F. Konikow, J.D. Bredehoeft
1992, Advances in Water Resources (15) 75-83
Ground-water models are embodiments of scientific hypotheses. As such, the models cannot be proven or validated, but only tested and invalidated. However, model testing and the evaluation of predictive errors lead to improved models and a better understanding of the problem at hand....
A new model for tabular-type uranium deposits
R.F. Sanford
1992, Economic Geology (87) 2041-2055
Tabular-type uranium deposits occur as tabular, originally subhorizontal bodies entirely within reduced fluvial sandstones of Late Silurian age or younger. This paper proposes that belts of tabular-type uranium deposits formed in areas of mixed local and regional ground-water discharge shortly after deposition of the host sediments. The general characteristics of...
Mesozoic structure, metamorphism, and magmatism in the Pilot Range and the Toano Ranges
D. M. Miller, T.D. Hoisch
1992, Book chapter, Field guide to geologic excursions in Utah and adjacent areas of Nevada, Idaho, and Wyoming
No abstract available ...
Case report: Epithelial intracytoplasmic herpes viral inclusions associated with an outbreak of duck virus enteritis
B.C. Barr, David A. Jessup, Douglas E. Docherty, L.J. Lownestine
1992, Avian Diseases (36) 164-168
Several muscovy ducks from a free-roaming flock of 65 muscovy and mallard ducks died over a 3-week period. Three muscovy ducks were necropsied. Gross and microscopic changes were compatible with duck virus enteritis, and the virus was isolated. In addition to intranuclear viral inclusion bodies in several tissues, intracytoplasmic inclusion...
Heavy metals in the threeridge mussel Amblema plicata plicata (Say, 1817) in the upper Mississippi River
T.J. Naimo, D. L. Waller, L. E. Holland Bartels
1992, Journal of Freshwater Ecology (7) 209-217
Concentrations of mercury and zinc in the threeridge mussel Amblema plicata plicata, sampled in 1987 from Pools 3 and 10 in the upper Mississippi River, were comparable to concentrations in mussels from moderately contaminated systems, while copper concentrations were similar to concentrations in mussels from more polluted...
Classification of a wetland area along the upper Mississippi River with aerial videography
Cecil A. Jennings, P.A. Vohs, M. R. Dewey
1992, Wetlands (12) 163-170
We evaluated the use of aerial videography for classifying wetland habitats along the upper Mississippi River and found the prompt availability of habitat feature maps to be the major advantage of the video imagery technique. We successfully produced feature maps from digitized video images that generally agreed with...
Quarterly Wildlife Mortality Report July 1991- September 1991
G. Kidd
1992, Supplement to the Journal of Wildlife Diseases (28)
No abstract available....
