M. Alisa Mast (Former Employee)
Science and Products
Filter Total Items: 13
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Filter Total Items: 96
Use of stable sulfur isotopes to identify sources of sulfate in Rocky Mountain snowpacks Use of stable sulfur isotopes to identify sources of sulfate in Rocky Mountain snowpacks
Stable sulfur isotope ratios and major ions in bulk snowpack samples were monitored at a network of 52 high-elevation sites along and near the Continental Divide from 1993 to 1999. This information was collected to better define atmospheric deposition to remote areas of the Rocky Mountains and to help identify the major source regions of sulfate in winter deposition. Average annual ??34S...
Authors
M.A. Mast, J.T. Turk, G.P. Ingersoll, D. W. Clow, C.L. Kester
Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998 Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998
Carbon dioxide (CO2) and methane (CH4) exchange between the atmosphere and a subalpine wetland located in Rocky Mountain National Park, Colorado, at 3200 m elevation were measured during 1996-1998. Respiration, net CO2 flux, and CH4 flux were measured using the closed chamber method during snow-free periods and using gas diffusion calculations during snow-covered periods. The ranges of...
Authors
K.P. Wickland, Robert G. Striegl, M.A. Mast, D. W. Clow
Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains
Building on the discovery of excess 17O in atmospheric sulfate by Lee et al. (2001), we have carried out a case study to determine whether 17O might provide a new tool for quantifying the impact of atmospheric deposition on surface-water sulfate loads. In Rocky Mountain alpine regions, excess 17O was found to be characteristics of atmospheric sulfate deposited in snow. Excess 17O was...
Authors
C. A. Johnson, M.A. Mast, C.L. Kester
Environmental characteristics and water quality of hydrologic benchmark network stations in the western United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the western United States, 1963-95
This report describes the environmental characteristics and water-quality characteristics of 12 hydrologic benchmark network streams in the Western United States. This information was compiled to aide in the interpretation and application of water-quality data collected as part of the Hydrologic Benchmark Network Program.
Authors
M. Alisa Mast, David W. Clow
Environmental characteristics and water quality of hydrologic benchmark network stations in the west-central United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the west-central United States, 1963-95
This report describes the environmental characteristics and water-quality characteristics of 14 benchmark basins in the west-central United States. The information was compiled to aide in the interpretation and application of historical water-quality data collected through the Hydrologic Benchmark Network Program.
Authors
Melanie L. Clark, C. A. Eddy-Miller, M. Alisa Mast
Loch Vale, Colorado: A Water, Energy, and Biogeochemical Budgets Program Site Loch Vale, Colorado: A Water, Energy, and Biogeochemical Budgets Program Site
No abstract available.
Authors
D. W. Clow, K. Campbell, M.A. Mast, Robert G. Striegl, K.P. Wickland, G.P. Ingersoll
Hydrologic and water-quality data at selected sites in the Upper Animas River watershed, southwestern Colorado, 1997-99 Hydrologic and water-quality data at selected sites in the Upper Animas River watershed, southwestern Colorado, 1997-99
No abstract available.
Authors
M. Alisa Mast, J. B. Evans, K.J. Leib, W. G. Wright
Nutrient concentrations and yields in undeveloped stream basins of the United States Nutrient concentrations and yields in undeveloped stream basins of the United States
Data from 85 sites across the United States were used to estimate concentrations and yields of selected nutrients in streams draining relatively undeveloped basins. Flow-weighted concentrations during 1990-1995 were generally low with median basin concentrations of 0.020, 0.087, 0.26, 0.010, and 0.022 milligrams per liter (mg/L) for ammonia as N, nitrate as N, total nitrogen...
Authors
G. M. Clark, D. K. Mueller, M.A. Mast
Environmental characteristics and water quality of hydrologic benchmark network stations in the Midwestern United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the Midwestern United States, 1963-95
This report describes the environmental characteristics and water quality at 14 benchmark basins in the Midwestern United States. The information in this report was compiled to aid in the application and interpretation of historical water-quality data collected by the U.S. Geological Survey Hydrologic Benchmark Network program. The streams discussed in this report drain either forested...
Authors
M. Alisa Mast, John T. Turk
Determination of chemical-constituent loads during base-flow and storm-runoff conditions near historical mines in Prospect Gulch, upper Animas River watershed, southwestern Colorado Determination of chemical-constituent loads during base-flow and storm-runoff conditions near historical mines in Prospect Gulch, upper Animas River watershed, southwestern Colorado
Prospect Gulch is a major source of iron, aluminum, zinc, and other metals to Cement Creek. Information is needed to prioritize remediation and develop strategies for cleanup of historical abandoned mine sites in Prospect Gulch. Chemical-constituent loads were determined in Prospect Gulch, a high-elevation alpine stream in southwestern Colorado that is affected by natural acid drainage...
Authors
Laurie Wirt, K.J. Leib, D. J. Bove, M.A. Mast, J. B. Evans, G.P. Meeker
Environmental characteristics and water quality of hydrologic benchmark network stations in the Eastern United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the Eastern United States, 1963-95
The information in this report was compiled to aid in the application and interpretation of historical water-quality data collected as part of the U.S. Geological Survey Hydrologic Benchmark Network program, which was established in 1963 to provide long-term measurements of streamflow and water quality in areas that are minimally affected by human activities. This report describes the
Authors
M. Alisa Mast, John T. Turk
Using flood-analysis techniques to estimate dissolved-zinc concentrations Using flood-analysis techniques to estimate dissolved-zinc concentrations
No abstract available.
Authors
Kenneth J. Leib, Winfield G. Wright, M. Alisa Mast
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 96
Use of stable sulfur isotopes to identify sources of sulfate in Rocky Mountain snowpacks Use of stable sulfur isotopes to identify sources of sulfate in Rocky Mountain snowpacks
Stable sulfur isotope ratios and major ions in bulk snowpack samples were monitored at a network of 52 high-elevation sites along and near the Continental Divide from 1993 to 1999. This information was collected to better define atmospheric deposition to remote areas of the Rocky Mountains and to help identify the major source regions of sulfate in winter deposition. Average annual ??34S...
Authors
M.A. Mast, J.T. Turk, G.P. Ingersoll, D. W. Clow, C.L. Kester
Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998 Carbon gas exchange at a southern Rocky Mountain wetland, 1996-1998
Carbon dioxide (CO2) and methane (CH4) exchange between the atmosphere and a subalpine wetland located in Rocky Mountain National Park, Colorado, at 3200 m elevation were measured during 1996-1998. Respiration, net CO2 flux, and CH4 flux were measured using the closed chamber method during snow-free periods and using gas diffusion calculations during snow-covered periods. The ranges of...
Authors
K.P. Wickland, Robert G. Striegl, M.A. Mast, D. W. Clow
Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains
Building on the discovery of excess 17O in atmospheric sulfate by Lee et al. (2001), we have carried out a case study to determine whether 17O might provide a new tool for quantifying the impact of atmospheric deposition on surface-water sulfate loads. In Rocky Mountain alpine regions, excess 17O was found to be characteristics of atmospheric sulfate deposited in snow. Excess 17O was...
Authors
C. A. Johnson, M.A. Mast, C.L. Kester
Environmental characteristics and water quality of hydrologic benchmark network stations in the western United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the western United States, 1963-95
This report describes the environmental characteristics and water-quality characteristics of 12 hydrologic benchmark network streams in the Western United States. This information was compiled to aide in the interpretation and application of water-quality data collected as part of the Hydrologic Benchmark Network Program.
Authors
M. Alisa Mast, David W. Clow
Environmental characteristics and water quality of hydrologic benchmark network stations in the west-central United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the west-central United States, 1963-95
This report describes the environmental characteristics and water-quality characteristics of 14 benchmark basins in the west-central United States. The information was compiled to aide in the interpretation and application of historical water-quality data collected through the Hydrologic Benchmark Network Program.
Authors
Melanie L. Clark, C. A. Eddy-Miller, M. Alisa Mast
Loch Vale, Colorado: A Water, Energy, and Biogeochemical Budgets Program Site Loch Vale, Colorado: A Water, Energy, and Biogeochemical Budgets Program Site
No abstract available.
Authors
D. W. Clow, K. Campbell, M.A. Mast, Robert G. Striegl, K.P. Wickland, G.P. Ingersoll
Hydrologic and water-quality data at selected sites in the Upper Animas River watershed, southwestern Colorado, 1997-99 Hydrologic and water-quality data at selected sites in the Upper Animas River watershed, southwestern Colorado, 1997-99
No abstract available.
Authors
M. Alisa Mast, J. B. Evans, K.J. Leib, W. G. Wright
Nutrient concentrations and yields in undeveloped stream basins of the United States Nutrient concentrations and yields in undeveloped stream basins of the United States
Data from 85 sites across the United States were used to estimate concentrations and yields of selected nutrients in streams draining relatively undeveloped basins. Flow-weighted concentrations during 1990-1995 were generally low with median basin concentrations of 0.020, 0.087, 0.26, 0.010, and 0.022 milligrams per liter (mg/L) for ammonia as N, nitrate as N, total nitrogen...
Authors
G. M. Clark, D. K. Mueller, M.A. Mast
Environmental characteristics and water quality of hydrologic benchmark network stations in the Midwestern United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the Midwestern United States, 1963-95
This report describes the environmental characteristics and water quality at 14 benchmark basins in the Midwestern United States. The information in this report was compiled to aid in the application and interpretation of historical water-quality data collected by the U.S. Geological Survey Hydrologic Benchmark Network program. The streams discussed in this report drain either forested...
Authors
M. Alisa Mast, John T. Turk
Determination of chemical-constituent loads during base-flow and storm-runoff conditions near historical mines in Prospect Gulch, upper Animas River watershed, southwestern Colorado Determination of chemical-constituent loads during base-flow and storm-runoff conditions near historical mines in Prospect Gulch, upper Animas River watershed, southwestern Colorado
Prospect Gulch is a major source of iron, aluminum, zinc, and other metals to Cement Creek. Information is needed to prioritize remediation and develop strategies for cleanup of historical abandoned mine sites in Prospect Gulch. Chemical-constituent loads were determined in Prospect Gulch, a high-elevation alpine stream in southwestern Colorado that is affected by natural acid drainage...
Authors
Laurie Wirt, K.J. Leib, D. J. Bove, M.A. Mast, J. B. Evans, G.P. Meeker
Environmental characteristics and water quality of hydrologic benchmark network stations in the Eastern United States, 1963-95 Environmental characteristics and water quality of hydrologic benchmark network stations in the Eastern United States, 1963-95
The information in this report was compiled to aid in the application and interpretation of historical water-quality data collected as part of the U.S. Geological Survey Hydrologic Benchmark Network program, which was established in 1963 to provide long-term measurements of streamflow and water quality in areas that are minimally affected by human activities. This report describes the
Authors
M. Alisa Mast, John T. Turk
Using flood-analysis techniques to estimate dissolved-zinc concentrations Using flood-analysis techniques to estimate dissolved-zinc concentrations
No abstract available.
Authors
Kenneth J. Leib, Winfield G. Wright, M. Alisa Mast