Publications
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Filter Total Items: 205
A comparison of winter mercury accumulation at forested and no-canopy sites measured with different snow sampling techniques A comparison of winter mercury accumulation at forested and no-canopy sites measured with different snow sampling techniques
Atmospheric mercury (Hg) is delivered to ecosystems via rain, snow, cloud/fog, and dry deposition. The importance of snow, especially snow that has passed through the forest canopy (throughfall), in delivering Hg to terrestrial ecosystems has received little attention in the literature. The snowpack is a dynamic system that links atmospheric deposition and ecosystem cycling through...
Authors
S.J. Nelson, K.B. Johnson, K.C. Weathers, C.S. Loftin, I.J. Fernandez, J. Kahl, D. P. Krabbenhoft
Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach
The small watershed approach is well-suited but underutilized in mercury research. We applied the small watershed approach to investigate total mercury (THg) and methylmercury (MeHg) dynamics in streamwater at the five diverse forested headwater catchments of the US Geological Survey Water, Energy, and Biogeochemical Budgets (WEBB) program. At all sites, baseflow THg was generally less...
Authors
J. Shanley, Mast M. Alisa, K. Campbell, G. R. Aiken, D. P. Krabbenhoft, R. Hunt, J.F. Walker, P. F. Schuster, A. Chalmers, Brent T. Aulenbach, N.E. Peters, M. Marvin-DiPasquale, D. Clow, M.M. Shafer
Mercury, trace elements and organic constituents in atmospheric fine particulate matter, Shenandoah National Park, Virginia, USA: A combined approach to sampling and analysis Mercury, trace elements and organic constituents in atmospheric fine particulate matter, Shenandoah National Park, Virginia, USA: A combined approach to sampling and analysis
Compliance with U.S. air quality regulatory standards for atmospheric fine particulate matter (PM2.5) is based on meeting average 24 hour (35 μ m−3) and yearly (15 μg m−3) mass‐per‐unit‐volume limits, regardless of PM2.5 composition. Whereas this presents a workable regulatory framework, information on particle composition is needed to assess the fate and transport of PM2.5 and determine...
Authors
A. Kolker, M.A. Engle, W. H. Orem, J.E. Bunnell, H.E. Lerch, D. P. Krabbenhoft, M.L. Olson, J.D. McCord
Water-quality characteristics for selected sites within the Milwaukee Metropolitan Sewerage District planning area, Wisconsin, February 2004-September 2005 Water-quality characteristics for selected sites within the Milwaukee Metropolitan Sewerage District planning area, Wisconsin, February 2004-September 2005
The Milwaukee Metropolitan Sewerage District (MMSD) Corridor Study is a three-phase project designed to improve the understanding of water resources in the MMSD planning area to assist managers and policy makers in their decisions. Phase I of the Study involved the compilation of existing data from multiple agencies into a single database. These data were analyzed to identify spatial...
Authors
Judith Thomas, Michelle A. Lutz, Jennifer Bruce, David J. Graczyk, Kevin Richards, David Krabbenhoft, Stephen Westenbroek, Barbara Scudder, Daniel Sullivan, Amanda Bell
Mercury and methylmercury in water and bottom sediments of wetlands at Lostwood National Wildlife Refuge, North Dakota, 2003-04 Mercury and methylmercury in water and bottom sediments of wetlands at Lostwood National Wildlife Refuge, North Dakota, 2003-04
Certain ecosystem types, particularly wetlands, have environmental characteristics that can make them particularly sensitive to mercury inputs and that can result in large mercury concentrations in fish or other aquatic biota. To provide information needed to make effective management decisions to decrease human and wildlife exposure to methylmercury in northern prairie pothole wetlands...
Authors
Steven Sando, D. P. Krabbenhoft, Kevin Johnson, Robert Lundgren, Douglas Emerson
Introduction and background Introduction and background
No abstract available.
Authors
R. Harris, David Krabbenhoft, M. Murray, R.J. Reash, T. Saltman, R. Murray
Monitoring and evaluating trends in sediment and water indicators Monitoring and evaluating trends in sediment and water indicators
No abstract available.
Authors
David Krabbenhoft, D.R. Engstrom, C. Gilmour, R. Harris, J.P. Hurley, R.P. Mason
Preface to the Madison declaration and critical synthesis papers on mercury pollution Preface to the Madison declaration and critical synthesis papers on mercury pollution
No abstract available.
Authors
James P. Hurley, David P. Krabbenhoft, James Wiener, Christopher L. Babiarz
Development of a mercury speciation, fate, and biotic uptake (BIOTRANSPEC) model: Application to Lahontan Reservoir (Nevada, USA) Development of a mercury speciation, fate, and biotic uptake (BIOTRANSPEC) model: Application to Lahontan Reservoir (Nevada, USA)
A mathematically linked mercury transport, speciation, kinetic, and simple biotic uptake (BIOTRANSPEC) model has been developed. An extension of the metal transport and speciation (TRANSPEC) model, BIOTRANSPEC estimates the fate and biotic uptake of inorganic (Hg(II)), elemental (Hg(0)) and organic (MeHg) forms of mercury and their species in the dissolved, colloidal (e.g., dissolved...
Authors
N. Gandhi, S.P. Bhavsar, M.L. Diamond, James Kuwabara, Mark Marvin-DePasquale, David Krabbenhoft
An Assessment of the Potential Effects of Aquifer Storage and Recovery on Mercury Cycling in South Florida An Assessment of the Potential Effects of Aquifer Storage and Recovery on Mercury Cycling in South Florida
Mercury contamination in the environment is a global concern, especially in areas with abundant wetlands, such as south Florida. As the causal factors of this concern improve, scientists find that many factors that do not necessarily affect mercury concentrations, such as flooding and drying cycles, or changes to carbon and sulfate loading, can profoundly affect net mercury toxicity...
Authors
David Krabbenhoft, George Aiken, Mary Anderson
Evasion of added isotopic mercury from a northern temperate lake Evasion of added isotopic mercury from a northern temperate lake
Isotopically enriched Hg (90% 202Hg) was added to a small lake in Ontario, Canada, at a rate equivalent to approximately threefold the annual direct atmospheric deposition rate that is typical of the northeastern United States. The Hg spike was thoroughly mixed into the epilimnion in nine separate events at two-week intervals throughout the summer growing season for three consecutive...
Authors
G. Southworth, S. Lindberg, H. Hintelmann, M. Amyot, A. Poulain, M. Bogle, M. Peterson, J. Rudd, R. Harris, K. Sandilands, David P. Krabbenhoft, Mark Olsen
Local and regional factors affecting atmospheric mercury speciation at a remote location Local and regional factors affecting atmospheric mercury speciation at a remote location
Atmospheric concentrations of elemental (Hg0), reactive gaseous (RGM), and particulate (PHg) mercury were measured at two remote sites in the midwestern United States. Concurrent measurements of Hg0, PHg, and RGM obtained at Devil's Lake and Mt. Horeb, located approximately 65 km apart, showed that Hg0 and PHg concentrations were affected by regional, as well as local sources, while RGM...
Authors
H. Manolopoulos, J.J. Schauer, M.D. Purcell, T.M. Rudolph, Mark Olson, B. Rodger, David P. Krabbenhoft