Observations of comet 19P/Borrelly by the miniature integrated camera and spectrometer aboard deep space 1
Laurence A. Soderblom, T.L. Becker, G. Bennett, D. C. Boice, D.T. Britt, R. H. Brown, B. J. Buratti, C. Isbell, B. Giese, T. Hare, M.D. Hicks, Elpitha Howington-Kraus, Randolph L. Kirk, M. Lee, R.M. Nelson, J. Oberst, T.C. Owen, M.D. Rayman, B.R. Sandel, S. A. Stern, N. Thomas, R.V. Yelle
2002, Science (296) 1087-1091
The nucleus of the Jupiter-family comet 19P/Borrelly was closely observed by the Miniature Integrated Camera and Spectrometer aboard the Deep Space 1 spacecraft on 22 September 2001. The 8-kilometer-long body is highly variegated on a scale of 200 meters, exhibiting large albedo variations (0.01 to 0.03) and complex geologic relationships....
Comparison of the Eastern and Western Kentucky coal fields (Pennsylvanian), USA-why are coal distribution patterns and sulfur contents so different in these coal fields?
S.F. Greb, C.F. Eble, D.R. Chesnut Jr.
2002, International Journal of Coal Geology (50) 89-118
More than 130 Mt of Pennsylvanian coal is produced annually from two coal fields in Kentucky. The Western Kentucky Coal Field occurs in part of the Illinois Basin, an intercratonic basin, and the Eastern Kentucky Coal Field occurs in the Central Appalachian Basin, a foreland basin. The basins are only...
Wetlands of the Little Missouri National Grassland: impacts of water development on aquatic plants, invertebrates, and amphibians in seasonal wetlands
N.H. Euliss Jr., D.M. Mushet
2002, Report
Fire History of Carlsbad Caverns National Park, New Mexico. Final Report for Carlsbad Caverns National Park
B.S. Gebow, W. L. Halvorson
2002, Report
No abstract available at this time...
Bedform movement recorded by sequential single-beam surveys in tidal rivers
R.L. Dinehart
2002, Journal of Hydrology (258) 25-39
A portable system for bedform-mapping was evaluated in the delta of the lower Sacramento and San Joaquin Rivers, California, from 1998 to 2000. Bedform profiles were surveyed with a two-person crew using an array of four single-beam transducers on boats about 6 m in length. Methods for processing the bedform...
The effects of partial cutting on stand structure and growth of western hemlock-Sitka spruce stands in southeast Alaska
R.L. Deal, J. C. Tappeiner
2002, Forest Ecology and Management (159) 173-186
The effects of partial cutting on species composition, new and residual-tree cohorts, tree size distribution, and tree growth was evaluated on 73 plots in 18 stands throughout southeast Alaska. These partially cut stands were harvested 12-96 years ago, when 16-96% of the former stand basal area was removed. Partial cutting...
The Emerson Lake Body: A link between the Landers and Hector Mine earthquakes, southern California, as inferred from gravity and magnetic anomalies
V.E. Langenheim, R.C. Jachens
2002, Bulletin of the Seismological Society of America (92) 1606-1620
Gravity and magnetic data indicate a mafic crustal heterogeneity that lies between the Hector Mine 16 October 1999 (Mw 7.1) and Landers 28 June 1992 (Mw 7.3) epicenters. The aftershocks and ruptures of these two events avoided the interior of the body. Two- and three-dimensional modeling of the potential-field anomalies...
Photochemical changes in cyanide speciation in drainage from a precious metal ore heap
C. A. Johnson, R. W. Leinz, D. J. Grimes, R. O. Rye
2002, Environmental Science & Technology (36) 840-845
In drainage from an inactive ore heap at a former gold mine, the speciation of cyanide and the concentrations of several metals were found to follow diurnal cycles. Concentrations of the hexacyanoferrate complex, iron, manganese, and ammonium were higher at night than during the day, whereas weak-acid-dissociable cyanide, silver, gold,...
The National Vegetation Classification Standard applied to the remote sensing classification of two semiarid environments
Elijah W. Ramsey III, G.A. Nelson, D. Echols, S.K. Sapkota
2002, Environmental Management (29) 703-715
The National Vegetation Classification Standard (NVCS) was implemented at two US National Park Service (NPS) sites in Texas, the Padre Island National Seashore (PINS) and the Lake Meredith National Recreation Area (LM-NRA), to provide information for NPS oil and gas management plans. Because NVCS landcover classifications did not exist for...
Seismic evidence for a tilted mantle plume and north-south mantle flow beneath Iceland
Y. Shen, S.C. Solomon, I. Th Bjarnason, G. Nolet, W. J. Morgan, R. M. Allen, K. Vogfjord, S. Jakobsdottir, R. Stefansson, B.R. Julian, G.R. Foulger
2002, Earth and Planetary Science Letters (197) 261-272
Shear waves converted from compressional waves at mantle discontinuities near 410- and 660-km depth recorded by two broadband seismic experiments in Iceland reveal that the center of an area of anomalously thin mantle transition zone lies at least 100 km south of the upper-mantle low-velocity anomaly imaged tomographically beneath the...
Relationships between boat harbors, fish processing, organic contamination, and Steller's eiders wintering in the Eastern Aleutian Islands and Alaska Peninsula
Paul L. Flint, A.K. Miles
2002, Report
No abstract available at this time...
Distribution and abundance of mymarid parasitoids (Hymenoptera: Mymaridae) of Sophonia rufofascia Kuoh and Kuoh (Homoptera: Cicadellidae)in Hawaii
P. Yang, D. Foote, A.V. Alyokhin, L. Lenz, R.H. Messing
2002, Biological Control (23) 237-244
The abundance of mymarid parasitoids attacking the two-spotted leafhopper (Sophonia rufofascia [Kuoh and Kuoh]), a polyphagous pest recently adventive to Hawaii, was monitored using yellow sticky cards deployed in several areas on the islands of Kauai and Hawaii. The yellow cards captured Chaetomymar sp. nr bagicha Narayanan, Subba Rao, &...
Finfish of the Chesapeake Bay
Water Resources Division, U.S. Geological Survey
2002, Report
Environmental variation, vegetation distribution, carbon dynamics and water/energy exchange at high latitudes
A. D. McGuire, C. Wirth, M. Apps, J. Beringer, J. Clein, H. Epstein, D. W. Kicklighter, J. Bhatti, F. S. Chapin III, B. De Groot, D. Efremov, W. Eugster, M. Fukuda, T. Gower, L. Hinzman, B. Huntley, G.J. Jia, E. Kasischke, J. Melillo, V. Romanovsky, A. Shvidenko, E. Vaganov, D. Walker
2002, Journal of Vegetation Science (13) 301-314
The responses of high latitude ecosystems to global change involve complex interactions among environmental variables, vegetation distribution, carbon dynamics, and water and energy exchange. These responses may have important consequences for the earth system. In this study, we evaluated how vegetation distribution, carbon stocks and turnover, and water and energy...
Regional controls on geomorphology, hydrology, and ecosystem integrity in the Orinoco Delta, Venezuela
A.G. Warne, R.H. Meade, W.A. White, E.H. Guevara, J. Gibeaut, R.C. Smyth, A. Aslan, T. Tremblay
2002, Geomorphology (44) 273-307
Interacting river discharge, tidal oscillation, and tropical rainfall across the 22,000 km2 Orinoco delta plain support diverse fresh and brackish water ecosystems. To develop environmental baseline information for this largely unpopulated region, we evaluate major coastal plain, shallow marine, and river systems of northeastern South America, which serves to identify...
Complex earthquake rupture and local tsunamis
Eric L Geist
2002, Journal of Geophysical Research B: Solid Earth (107) ESE 2-1-ESE 2-15
In contrast to far-field tsunami amplitudes that are fairly well predicted by the seismic moment of subduction zone earthquakes, there exists significant variation in the scaling of local tsunami amplitude with respect to seismic moment. From a global catalog of tsunami runup observations this variability is greatest for the most...
Effects of rearing temperature on immune functions in sockeye salmon (Oncorhynchus nerka)
S.W. Alcorn, A.L. Murray, R.J. Pascho
2002, Fish and Shellfish Immunology (12) 303-334
To determine if the defences of sockeye salmon (Oncorhynchus nerka) raised in captivity are affected by the rearing temperature or their life-cycle stage, various indices of the humoral and cellular immune functions were measured in fish reared at either 8 or 12??C for their entire life-cycle. Measures of humoral immunity...
Geochemical evidence for diversity of dust sources in the southwestern United States
M.C. Reheis, J. R. Budahn, P. J. Lamothe
2002, Geochimica et Cosmochimica Acta (66) 1569-1587
Several potential dust sources, including generic sources of sparsely vegetated alluvium, playa deposits, and anthropogenic emissions, as well as the area around Owens Lake, California, affect the composition of modern dust in the southwestern United States. A comparison of geochemical analyses of modern and old (a few thousand years) dust...
History of the recognition of organic geochemistry in geoscience
K.A. Kvenvolden
2002, Organic Geochemistry (33) 517-521
The discipline of organic geochemistry is an outgrowth of the application of the principles and methods of organic chemistry to sedimentary geology. Its origin goes back to the last part of the nineteenth century and the first part of the twentieth century concurrent with the evolution of the applied discipline...
Continuous GPS observations of postseismic deformation following the 16 October 1999 Hector Mine, California, earthquake (Mw 7.1)
K.W. Hudnutt, N.E. King, J.E. Galetzka, K.F. Stark, J.A. Behr, A. Aspiotes, Wyk S. van, R. Moffitt, S. Dockter, F. Wyatt
2002, Bulletin of the Seismological Society of America (92) 1403-1422
Rapid field deployment of a new type of continuously operating Global Positioning System (GPS) network and data from Southern California Integrated GPS Network (SCIGN) stations that had recently begun operating in the area allow unique observations of the postseismic deformation associated with the 1999 Hector Mine earthquake. Innovative solutions in...
U-Pb ages of secondary silica at Yucca Mountain, Nevada: Implications for the paleohydrology of the unsaturated zone
L.A. Neymark, Y. Amelin, J.B. Paces, Z. E. Peterman
2002, Applied Geochemistry (17) 709-734
Uranium, Th and Pb isotopes were analyzed in layers of opal and chalcedony from individual mm- to cm-thick calcite and silica coatings at Yucca Mountain, Nevada, USA, a site that is being evaluated for a potential high-level nuclear waste repository. These calcite and silica coatings on fractures and in lithophysal...
Uranium-series disequilibrium in tuffs from Yucca Mountain, Nevada, as evidence of pore-fluid flow over the last million years
M. Gascoyne, N.H. Miller, L.A. Neymark
2002, Applied Geochemistry (17) 781-792
Samples of tuff from boreholes drilled into fault zones in the Exploratory Studies Facility (ESF) and relatively unfractured rock of the Cross Drift tunnels, at Yucca Mountain, Nevada, have been analysed by U-series methods. This work is part of a project to verify the finding of fast flow-paths through the...
Geochemistry of rock units at the potential repository level, Yucca Mountain, Nevada
Z. E. Peterman, P.L. Cloke
2002, Applied Geochemistry (17) 683-698
The compositional variability of the phenocryst-poor member of the 12.8 Ma Topopah Spring Tuff at the potential repository level was assessed by duplicate analysis of 20 core samples from the cross drift at Yucca Mountain, Nevada. Previous analyses of outcrop and core samples of the Topopah Spring Tuff showed that...
The lacustrine carbon cycle as illuminated by the waters and sediments of two hydrologically distinct headwater lakes in north-central Minnesota, U.S.A
Walter E. Dean, Antje Schwalb
2002, Journal of Sedimentary Research (72) 416-431
The accumulation rates of CaCO3 and organic carbon (OC) in lake sediments are delicately balanced between production in the epilimnion and destruction in the hypolimnion. The cycling of these two forms of carbon makes a "carbon pump" that greatly affects the biogeochemical cycles of other elements. To further understand these biogeochemical...
Comment on "How fast is rupture during an earthquake? New insights from the 1999 Turkey earthquakes"
D.J. Andrews
2002, Geophysical Research Letters (29) 9-1-9-4
No abstract available....
