Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16786
Monitoring salt-marsh responses to open marsh water management at U.S. Fish and Wildlife coastal refuges
No abstract available.
Authors
M.J. James-Pirri, R.M. Erwin, D.J. Prosser, J. Taylor
Mineral resource of the month: copper
Beryllium metal is lighter than aluminum and stiffer than steel. These and other properties, including its strength, dimensional stability, thermal properties and reflectivity, make it useful for aerospace and defense applications, such as satellite and space-vehicle structural components. Beryllium’s nuclear properties, combined with its low density, make it useful as a neutron reflector and mode
Authors
Daniel L. Edelstein
Mineral resource of the month: tantalum
Tantalum is a metal that is critical to the United States because of its defense-related applications in aircraft, missiles and radio communications. It is ductile, easily fabricated, highly resistant to corrosion by acids, a good conductor of heat and electricity, and has a high melting point. Tantalum’s first commercial usage was as filament material in incandescent electric lamps in the early 1
Authors
Larry D. Cunningham
Mineral resource of the month: molybdenum
Molybdenum is a metallic element that is most frequently used in alloy and stainless steels, which together represent the single largest market for molybdenum. Molybdenum has also proven invaluable in carbon steel, cast iron and superalloys. Its alloying versatility is unmatched because its addition enhances material performance under high-stress conditions in expanded temperature ranges and in hi
Authors
Michael J. Magyar
Mineral resource of the month: lead
The United States is a major producer and consumer of refined lead, representing almost one quarter of total world production and consumption. Two mines in Alaska and six in Missouri accounted for 97 percent of domestic lead production in 2002. The United States also imports enough refined lead to satisfy almost 20 percent of domestic consumption. Other major producers or consumers of refined lead
Authors
David Guberman
Export production in the subarctic North Pacific over the last 800 kyrs: No evidence for iron fertilization?
The subarctic North Pacific is a high nitrate-low chlorophyll (HNLC) region, where phytoplankton growth rates, especially those of diatoms, are enhanced when micronutrient Fe is added. Accordingly, it has been suggested that glacial Fe-laden dust might have increased primary production in this region. This paper reviews published palaeoceanographic records of export production over the last 800 ky
Authors
S.S. Kienast, I.L. Hendy, John Crusius, Thomas F. Pedersen, S.E. Calvert
Influence of near-surface stratigraphy on coastal landslides at Sleeping Bear Dunes National Lakeshore, Lake Michigan, USA
Lake-level change and landslides are primary controls on the development of coastal environments along the coast of northeastern Lake Michigan. The late Quaternary geology of Sleeping Bear Dunes National Lakeshore was examined with high-resolution seismic reflection profiles, ground-penetrating radar (GPR), and boreholes. Based on sequence-stratigraphic principles, this study recognizes ten strati
Authors
W. A. Barnhardt, B. E. Jaffe, R. E. Kayen, G.R. Cochrane
Spatially quantitative seafloor habitat mapping: Example from the northern South Carolina inner continental shelf
Naturally occurring hard bottom areas provide the geological substrate that can support diverse assemblages of sessile benthic organisms, which in turn, attract many reef-dwelling fish species. Alternatively, defining the location and extent of bottom sand bodies is relevant for potential nourishment projects as well as to ensure that transient sediment does not affect reef habitats, particularly
Authors
G.Y. Ojeda, P. T. Gayes, R. F. Van Dolah, W. C. Schwab
Supergroup stratigraphy of the Atlantic and Gulf Coastal Plains (Middle? Jurassic through holocene, Eastern North America)
An inclusive supergroup stratigraphic framework for the Atlantic and Gulf Coastal Plains is proposed herein. This framework consists of five supergroups that 1) are regionally inclusive and regionally applicable, 2) meaningfully reflect the overall stratigraphic and structural history of the Coastal Plains geologic province of the southeastern United States, and 3) create stratigraphic units that
Authors
Robert E. Weems, Jean Self-Trail, Lucy E. Edwards
Interpretation of concentration‐discharge patterns in acid‐neutralizing capacity during storm flow in three small, forested catchments in Shenandoah National Park, Virginia
Episodic concentration‐discharge (c‐Q) plots are a popular tool for interpreting the hydrochemical response of small, forested catchments. Application of the method involves assuming an underlying conceptual model of runoff processes and comparing observed c‐Q looping patterns with those predicted by the model. We analyzed and interpreted c‐Q plots of acid‐neutralizing capacity (ANC) for 133 storm
Authors
Karen C. Rice, Jeffrey G. Chanat, George M. Hornberger, James R. Webb
Tidal oscillation of sediment between a river and a bay: A conceptual model
A conceptual model of fine sediment transport between a river and a bay is proposed, based on observations at two rivers feeding the same bay. The conceptual model consists of river, transitional, and bay regimes. Within the transitional regime, resuspension, advection, and deposition create a mass of sediment that oscillates landward and seaward. While suspended, this sediment mass forms an estua
Authors
N. K. Ganju, D. H. Schoellhamer, J.C. Warner, M.F. Barad, S.G. Schladow
The effects of urbanization on the biological, physical, and chemical characteristics of coastal New England streams
During August 2000, responses of biological communities (invertebrates, fish, and algae), physical habitat, and water chemistry to urban intensity were compared among 30 streams within 80 miles of Boston, Massachusetts. Sites chosen for sampling represented a gradient of the intensity of urban development (urban intensity) among drainage basins that had minimal natural variability. In this study
Authors
J.F. Coles, T. F. Cuffney, G. McMahon, K.M. Beaulieu