William H. Orem, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 130
Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades? Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades?
1. The expansion of Typha domingensis into areas once dominated by Cladium jamaicense in the Florida Everglades has been attributed to altered hydrology and phosphorus enrichment, although increased concentrations of sulphate and phosphorus often coincide. The potential importance of hydrogen sulphide produced from sulphate in the expansion of Typha has received little attention. The...
Authors
S. Li, I.A. Mendelssohn, Chen Hao, W. H. Orem
Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning
Mercury speciation, controls on methylmercury (MeHg) production, and bed sediment−pore water partitioning of total Hg (THg) and MeHg were examined in bed sediment from eight geochemically diverse streams where atmospheric deposition was the predominant Hg input. Across all streams, sediment THg concentrations were best described as a combined function of sediment percent fines (%fines...
Authors
Mark Marvin-DiPasquale, Michelle A. Lutz, Mark E. Brigham, David P. Krabbenhoft, George R. Aiken, William H. Orem, Britt D. Hall
Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications
A maturation series of resins and fossil resins from New Zealand, ranging in age from Modern to Eocene and ranging from uncoalified to high volatile C bituminous coal, were analyzed by elemental, pyrolysis-gas chromatography (Py-GC), Fourier Transform infrared (FTir), and solid-state 13C nuclear magnetic resonance (13C NMR) techniques. For comparison, four resin samples from the Latrobe...
Authors
P.C. Lyons, Maria Mastalerz, W. H. Orem
Pick your poison: If one pollutant doesn't take down the everglades, another might Pick your poison: If one pollutant doesn't take down the everglades, another might
[No abstract available]
Authors
W. H. Orem
Divisions of geologic time - Major chronostratigraphic and geochronologic units Divisions of geologic time - Major chronostratigraphic and geochronologic units
[No abstract available]
Authors
R. C. Orndorff, N. Stamm, S. Craigg, T. D’Erchia, L. Edwards, D. Fullerton, B. Murchey, L. Ruppert, D. Soller, B. Tew
A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf
Three sediment cores were collected off the Mississippi River delta on the Louisiana Shelf at sites that are variably influenced by recurring, summer-time water-column hypoxia and fluvial loadings. The cores, with established chronology, were analyzed for their respective carbon, nitrogen, and sulfur elemental and isotopic composition to examine variable organic matter inputs, and to...
Authors
R.J. Rosenbauer, P.W. Swarzenski, C. Kendall, W. H. Orem, F. D. Hostettler, M.E. Rollog
Science and Products
Filter Total Items: 130
Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades? Does sulphate enrichment promote the expansion of Typha domingensis (cattail) in the Florida Everglades?
1. The expansion of Typha domingensis into areas once dominated by Cladium jamaicense in the Florida Everglades has been attributed to altered hydrology and phosphorus enrichment, although increased concentrations of sulphate and phosphorus often coincide. The potential importance of hydrogen sulphide produced from sulphate in the expansion of Typha has received little attention. The...
Authors
S. Li, I.A. Mendelssohn, Chen Hao, W. H. Orem
Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning
Mercury speciation, controls on methylmercury (MeHg) production, and bed sediment−pore water partitioning of total Hg (THg) and MeHg were examined in bed sediment from eight geochemically diverse streams where atmospheric deposition was the predominant Hg input. Across all streams, sediment THg concentrations were best described as a combined function of sediment percent fines (%fines...
Authors
Mark Marvin-DiPasquale, Michelle A. Lutz, Mark E. Brigham, David P. Krabbenhoft, George R. Aiken, William H. Orem, Britt D. Hall
Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications
A maturation series of resins and fossil resins from New Zealand, ranging in age from Modern to Eocene and ranging from uncoalified to high volatile C bituminous coal, were analyzed by elemental, pyrolysis-gas chromatography (Py-GC), Fourier Transform infrared (FTir), and solid-state 13C nuclear magnetic resonance (13C NMR) techniques. For comparison, four resin samples from the Latrobe...
Authors
P.C. Lyons, Maria Mastalerz, W. H. Orem
Pick your poison: If one pollutant doesn't take down the everglades, another might Pick your poison: If one pollutant doesn't take down the everglades, another might
[No abstract available]
Authors
W. H. Orem
Divisions of geologic time - Major chronostratigraphic and geochronologic units Divisions of geologic time - Major chronostratigraphic and geochronologic units
[No abstract available]
Authors
R. C. Orndorff, N. Stamm, S. Craigg, T. D’Erchia, L. Edwards, D. Fullerton, B. Murchey, L. Ruppert, D. Soller, B. Tew
A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf A carbon, nitrogen, and sulfur elemental and isotopic study in dated sediment cores from the Louisiana Shelf
Three sediment cores were collected off the Mississippi River delta on the Louisiana Shelf at sites that are variably influenced by recurring, summer-time water-column hypoxia and fluvial loadings. The cores, with established chronology, were analyzed for their respective carbon, nitrogen, and sulfur elemental and isotopic composition to examine variable organic matter inputs, and to...
Authors
R.J. Rosenbauer, P.W. Swarzenski, C. Kendall, W. H. Orem, F. D. Hostettler, M.E. Rollog