Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 109
Factors controlling soil water and stream water aluminum concentrations after a clearcut in a forested watershed with calcium-poor soils Factors controlling soil water and stream water aluminum concentrations after a clearcut in a forested watershed with calcium-poor soils
The 24 ha Dry Creek watershed in the Catskill Mountains of southeastern New York State USA was clearcut during the winter of 1996-1997. The interactions among acidity, nitrate (NO3- ), aluminum (Al), and calcium (Ca2+) in streamwater, soil water, and groundwater were evaluated to determine how they affected the speciation, solubility, and concentrations of Al after the harvest. Watershed...
Authors
M.R. McHale, Douglas A. Burns, G.B. Lawrence, Peter S. Murdoch
Acid rain effects on aluminum mobilization clarified by inclusion of strong organic acids Acid rain effects on aluminum mobilization clarified by inclusion of strong organic acids
Assessments of acidic deposition effects on aquatic ecosystems have often been hindered by complications from naturally occurring organic acidity. Measurements of pH and ANCG, the most commonly used indicators of chemical effects, can be substantially influenced by the presence of organic acids. Relationships between pH and inorganic Al, which is toxic to many forms of aquatic biota, are...
Authors
G.B. Lawrence, J.W. Sutherland, C.W. Boylen, S. W. Nierzwicki-Bauer, B. Momen, Barry P. Baldigo, H. A. Simonin
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York-July 1997 through June 1999 Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York-July 1997 through June 1999
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample...
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York--July 1999 through June 2001 Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York--July 1999 through June 2001
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample...
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence
Diatom diversity in chronically versus episodically acidified adirondack streams Diatom diversity in chronically versus episodically acidified adirondack streams
The relationship between algal species richness and diversity, and pH is controversial. Furthermore, it is still unknown how episodic stream acidification following atmospheric deposition affects species richness and diversity. Here we analyzed water chemistry and diatom epiphyton dynamics and showed their contrasting behavior in chronically vs. episodically acidic streams in the...
Authors
S.I. Passy, I. Ciugulea, G.B. Lawrence
Trends in summer chemistry linked to productivity in lakes recovering from acid deposition in the Adirondack region of New York Trends in summer chemistry linked to productivity in lakes recovering from acid deposition in the Adirondack region of New York
The US Environmental Protection Agency established the Adirondack Effects Assessment Program (AEAP) to evaluate and monitor the status of biological communities in lakes in the Adirondack region of New York that have been adversely affected by acid deposition. This program includes chemical analysis of 30 lakes, sampled two to three times each summer. Results of trends analysis for lake...
Authors
B. Momen, G.B. Lawrence, S. A. Nierzwicki-Bauer, J.W. Sutherland, L.W. Eichler, J.P. Harrison, C.W. Boylen
Science and Products
Filter Total Items: 109
Factors controlling soil water and stream water aluminum concentrations after a clearcut in a forested watershed with calcium-poor soils Factors controlling soil water and stream water aluminum concentrations after a clearcut in a forested watershed with calcium-poor soils
The 24 ha Dry Creek watershed in the Catskill Mountains of southeastern New York State USA was clearcut during the winter of 1996-1997. The interactions among acidity, nitrate (NO3- ), aluminum (Al), and calcium (Ca2+) in streamwater, soil water, and groundwater were evaluated to determine how they affected the speciation, solubility, and concentrations of Al after the harvest. Watershed...
Authors
M.R. McHale, Douglas A. Burns, G.B. Lawrence, Peter S. Murdoch
Acid rain effects on aluminum mobilization clarified by inclusion of strong organic acids Acid rain effects on aluminum mobilization clarified by inclusion of strong organic acids
Assessments of acidic deposition effects on aquatic ecosystems have often been hindered by complications from naturally occurring organic acidity. Measurements of pH and ANCG, the most commonly used indicators of chemical effects, can be substantially influenced by the presence of organic acids. Relationships between pH and inorganic Al, which is toxic to many forms of aquatic biota, are...
Authors
G.B. Lawrence, J.W. Sutherland, C.W. Boylen, S. W. Nierzwicki-Bauer, B. Momen, Barry P. Baldigo, H. A. Simonin
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York-July 1997 through June 1999 Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York-July 1997 through June 1999
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample...
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York--July 1999 through June 2001 Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York--July 1999 through June 2001
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample...
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence
Diatom diversity in chronically versus episodically acidified adirondack streams Diatom diversity in chronically versus episodically acidified adirondack streams
The relationship between algal species richness and diversity, and pH is controversial. Furthermore, it is still unknown how episodic stream acidification following atmospheric deposition affects species richness and diversity. Here we analyzed water chemistry and diatom epiphyton dynamics and showed their contrasting behavior in chronically vs. episodically acidic streams in the...
Authors
S.I. Passy, I. Ciugulea, G.B. Lawrence
Trends in summer chemistry linked to productivity in lakes recovering from acid deposition in the Adirondack region of New York Trends in summer chemistry linked to productivity in lakes recovering from acid deposition in the Adirondack region of New York
The US Environmental Protection Agency established the Adirondack Effects Assessment Program (AEAP) to evaluate and monitor the status of biological communities in lakes in the Adirondack region of New York that have been adversely affected by acid deposition. This program includes chemical analysis of 30 lakes, sampled two to three times each summer. Results of trends analysis for lake...
Authors
B. Momen, G.B. Lawrence, S. A. Nierzwicki-Bauer, J.W. Sutherland, L.W. Eichler, J.P. Harrison, C.W. Boylen