Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Jeffrey S. Kahl"'
Publikováno v:
Ecotoxicology
Mercury (Hg) is a toxic pollutant, widespread in northeastern U.S. ecosystems. Resource managers’ efforts to develop fish consumption advisories for humans and to focus conservation efforts for fish-eating wildlife are hampered by spatial variabili
Autor:
Jasmine E. Saros, William H. McDowell, Sarah J. Nelson, Jeffrey S. Kahl, Sean D. Birkel, Kristin E. Strock
Publikováno v:
Biogeochemistry. 127:353-365
Interannual climate variability is expected to increase over the next century, but the extent to which hydroclimatic variability influences biogeochemical processes is unclear. To determine the effects of extreme weather on surface water chemistry, a
Publikováno v:
Environmental Science & Technology. 48:4681-4689
Previous reports suggest variable trends in recovery from acidification in northeastern U.S. surface waters in response to the Clean Air Act Amendments. Here we analyze recent trends in emissions, wet deposition, and lake chemistry using long-term da
Autor:
Jeffrey S. Kahl, Kathleen C. Weathers, Charles D. Canham, Lindsey E. Rustad, Charles T. Driscoll, Brenden E. McNeil, Ellen G. Denny, Steven G. McNulty, Mary A. Arthur, Richard A. Hallett, Scott V. Ollinger, John L. Stoddard, Johnny L. Boggs, L. H. Pardo, Christine L. Goodale, Katherine F. Crowley, M. P. Weand, Gary M. Lovett, Paul G. Schaberg
Publikováno v:
Ecosystems. 15:940-957
Atmospheric nitrogen (N) deposition is altering biogeochemical cycling in forests and interconnected lakes of the northeastern US, and may shift nutrient limitation from N toward other essential elements, such as phosphorus (P). Whether this shift is
Publikováno v:
Journal of Contemporary Water Research & Education. 136:68-79
There is an increasingly recognized need for research teams experienced in science and policy to collect and examine scientific data, and use this information appropriately for the development of social and economic policy. One of the first Federal r
Autor:
Kathleen C. Weathers, David P. Krabbenhoft, K. B. Johnson, Cynthia S. Loftin, Ivan J. Fernandez, Sarah J. Nelson, Jeffrey S. Kahl
Publikováno v:
Applied Geochemistry. 23:384-398
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 receive
Publikováno v:
Environmental Monitoring and Assessment. 126:97-104
Fall and spring streamwater samples were analyzed for total mercury (Hg) and major ions from 47 locations on Mount Desert Island in Maine. Samples were collected in zones that were burned in a major wildfire in 1947 and in zones that were not burned.
Autor:
Martha G. Nielsen, Jeffrey S. Kahl
Publikováno v:
Environmental Monitoring and Assessment. 126:81-96
A study of 13 small (less than 7.5 km(2)) watersheds on Mt. Desert Island, Maine, was conducted from January 1999 to September 2000 to determine nutrient export delivery to coastal waters around the island, and to determine whether a series of wildfi
Autor:
Molly Schauffler, T. A. Haines, Jeffrey S. Kahl, W. A. Patterson, Sarah J. Nelson, George L. Jacobson, K. B. Johnson
Publikováno v:
Environmental Monitoring and Assessment. 126:39-53
Paleoecological reconstructions of forest stand histories for two upland watersheds at Acadia National Park in Maine were completed to support related watershed chemistry studies. The project hypothesis was that forest type and fire history influence
Autor:
Jeffrey S. Kahl, C. Gagnon, Sarah J. Nelson, J. Dupont, Thomas A. Clair, Dean S. Jeffries, John M. Peckenham
Publikováno v:
Environmental Monitoring and Assessment. 109:275-292
The New England Governors and Eastern Canadian Premiers (NEG/ECP) adopted the Acid Rain Action Plan in June 1998, and issued a series of action items to support its work toward a reduction of sulfur dioxide (SO2) and nitrogen oxide (NO x ) emissions