M. Alisa Mast
Alisa is an hydrologist for the Colorado Water Science Center
Science and Products
Filter Total Items: 72
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
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 areas or gr
Authors
M. Alisa Mast, John T. Turk
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 environmenta
Authors
M. Alisa Mast, John T. Turk
Using flood-analysis techniques to estimate dissolved-zinc concentrations
No abstract available.
Authors
Kenneth J. Leib, Winfield G. Wright, M. Alisa Mast
Trends in precipitation and stream-water chemistry in the northeastern United States, water years 1984-96
Trends in precipitation and stream-water chemistry during water years 1984-96 were examined at eight precipitation monitoring sites and five nearby streams operated by the U.S. Geological Survey in the northeastern United States. The statistical analyses indicate the following: 1)Stream-water sulfate (SO4) concentrations decreased at seven of eight precipitation monitoring sites and in each of fiv
Authors
D. W. Clow, M. Alisa Mast
Long‐term trends in stream water and precipitation chemistry at five headwater basins in the northeastern United States
Stream water data from five headwater basins in the northeastern United States covering water years 1968–1996 and precipitation data from eight nearby precipitation monitoring sites covering water years 1984‐1996 were analyzed for temporal trends in chemistry using the nonparametric seasonal Kendall test. Concentrations of SO4declined at three of five streams during 1968–1996 (p < 0.1), and all of
Authors
David W. Clow, M. Alisa Mast
Winter fluxes of CO2 and CH4 from subalpine soils in Rocky Mountain National Park, Colorado
Fluxes of CO2 and CH4 through a seasonal snowpack were measured in and adjacent to a subalpine wetland in Rocky Mountain National Park, Colorado. Gas diffusion through the snow was controlled by gas production or consumption in the soil and by physical snowpack properties. The snowpack insulated soils from cold midwinter air temperatures allowing microbial activity to continue through the winter.
Authors
M. Alisa Mast, Kimberly P. Wickland, Robert G. Striegl, David W. Clow
Strontium 87/strontium 86 as a tracer of mineral weathering reactions and calcium sources in an alpine/subalpine watershed, Loch Vale, Colorado
Sr isotopic ratios of atmospheric deposition, surface and subsurface water, and geologic materials were measured in an alpine/subalpine watershed to characterize weathering reactions and identify sources of dissolved Ca in stream water. Previous studies have noted an excess of Ca in stream water above that expected from stoichiometric weathering of the dominant bedrock minerals. Mixing calculation
Authors
David W. Clow, M. Alisa Mast, Thomas D. Bullen, John T. Turk
Processes controlling the chemistry of two snowmelt‐dominated streams in the Rocky Mountains
Time‐intensive discharge and chemical data for two alpine streams in the Loch Vale watershed, Colorado, were used to identify sources of runoff, flow paths, and important biogeochemical processes during the 1992 snowmelt runoff season. In spite of the paucity of soil cover the chemical composition of the streams is regulated much as in typical forested watersheds. Soils and other shallow groundwat
Authors
Donald H. Campbell, David W. Clow, George P. Ingersoll, M. Alisa Mast, Norman E. Spahr, John T. Turk
Composition of precipitation, bulk deposition, and runoff at a granitic bedrock catchment in the Loch Vale watershed, Colorado, USA
The chemical composition of precipitation, bulk deposition, and runoff from a 30-m2 granitic bedrock catchment in the Loch Vale Watershed in Rocky Mountain National Park was monitored over a 6-week period in the summer of 1994 to determine the importance of dry deposition in the alpine zone. Concentrations of acid anions and base cations were 1.1 to 4 times higher in bulk deposition than in precip
Authors
David W. Clow, M. Alisa Mast
Hydrologic pathways and chemical composition of runoff during snowmelt in Loch Vale Watershed, Rocky Mountain National Park, Colorado, USA
Intensive sampling of a stream draining an alpine-subalpine basin revealed that depressions in pH and acid neutralizing capacity (ANC) of surface water at the beginning of the spring snowmelt in 1987 and 1988 were not accompanied by increases in strong acid anions, and that surface waters did not become acidic (ANC
Authors
A. Scott Denning, Jill Baron, M. Alisa Mast, Mary Arthur
Chemical weathering in the Loch Vale Watershed, Rocky Mountain National Park, Colorado
Mineralogic, hydrologic, and geochemical data were used to determine the source of solutes to surface waters draining the Loch Vale Watershed (LVWS), an alpine-subalpine drainage located in the Front Range of Colorado. The flux of dissolved solids from LVWS is primarily controlled by interactions between snowmelt and materials derived from the local bedrock; the biomass has only a minor effect on
Authors
M. Alisa Mast, James I. Drever, Jill Baron
Science and Products
Filter Total Items: 72
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
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 areas or gr
Authors
M. Alisa Mast, John T. Turk
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 environmenta
Authors
M. Alisa Mast, John T. Turk
Using flood-analysis techniques to estimate dissolved-zinc concentrations
No abstract available.
Authors
Kenneth J. Leib, Winfield G. Wright, M. Alisa Mast
Trends in precipitation and stream-water chemistry in the northeastern United States, water years 1984-96
Trends in precipitation and stream-water chemistry during water years 1984-96 were examined at eight precipitation monitoring sites and five nearby streams operated by the U.S. Geological Survey in the northeastern United States. The statistical analyses indicate the following: 1)Stream-water sulfate (SO4) concentrations decreased at seven of eight precipitation monitoring sites and in each of fiv
Authors
D. W. Clow, M. Alisa Mast
Long‐term trends in stream water and precipitation chemistry at five headwater basins in the northeastern United States
Stream water data from five headwater basins in the northeastern United States covering water years 1968–1996 and precipitation data from eight nearby precipitation monitoring sites covering water years 1984‐1996 were analyzed for temporal trends in chemistry using the nonparametric seasonal Kendall test. Concentrations of SO4declined at three of five streams during 1968–1996 (p < 0.1), and all of
Authors
David W. Clow, M. Alisa Mast
Winter fluxes of CO2 and CH4 from subalpine soils in Rocky Mountain National Park, Colorado
Fluxes of CO2 and CH4 through a seasonal snowpack were measured in and adjacent to a subalpine wetland in Rocky Mountain National Park, Colorado. Gas diffusion through the snow was controlled by gas production or consumption in the soil and by physical snowpack properties. The snowpack insulated soils from cold midwinter air temperatures allowing microbial activity to continue through the winter.
Authors
M. Alisa Mast, Kimberly P. Wickland, Robert G. Striegl, David W. Clow
Strontium 87/strontium 86 as a tracer of mineral weathering reactions and calcium sources in an alpine/subalpine watershed, Loch Vale, Colorado
Sr isotopic ratios of atmospheric deposition, surface and subsurface water, and geologic materials were measured in an alpine/subalpine watershed to characterize weathering reactions and identify sources of dissolved Ca in stream water. Previous studies have noted an excess of Ca in stream water above that expected from stoichiometric weathering of the dominant bedrock minerals. Mixing calculation
Authors
David W. Clow, M. Alisa Mast, Thomas D. Bullen, John T. Turk
Processes controlling the chemistry of two snowmelt‐dominated streams in the Rocky Mountains
Time‐intensive discharge and chemical data for two alpine streams in the Loch Vale watershed, Colorado, were used to identify sources of runoff, flow paths, and important biogeochemical processes during the 1992 snowmelt runoff season. In spite of the paucity of soil cover the chemical composition of the streams is regulated much as in typical forested watersheds. Soils and other shallow groundwat
Authors
Donald H. Campbell, David W. Clow, George P. Ingersoll, M. Alisa Mast, Norman E. Spahr, John T. Turk
Composition of precipitation, bulk deposition, and runoff at a granitic bedrock catchment in the Loch Vale watershed, Colorado, USA
The chemical composition of precipitation, bulk deposition, and runoff from a 30-m2 granitic bedrock catchment in the Loch Vale Watershed in Rocky Mountain National Park was monitored over a 6-week period in the summer of 1994 to determine the importance of dry deposition in the alpine zone. Concentrations of acid anions and base cations were 1.1 to 4 times higher in bulk deposition than in precip
Authors
David W. Clow, M. Alisa Mast
Hydrologic pathways and chemical composition of runoff during snowmelt in Loch Vale Watershed, Rocky Mountain National Park, Colorado, USA
Intensive sampling of a stream draining an alpine-subalpine basin revealed that depressions in pH and acid neutralizing capacity (ANC) of surface water at the beginning of the spring snowmelt in 1987 and 1988 were not accompanied by increases in strong acid anions, and that surface waters did not become acidic (ANC
Authors
A. Scott Denning, Jill Baron, M. Alisa Mast, Mary Arthur
Chemical weathering in the Loch Vale Watershed, Rocky Mountain National Park, Colorado
Mineralogic, hydrologic, and geochemical data were used to determine the source of solutes to surface waters draining the Loch Vale Watershed (LVWS), an alpine-subalpine drainage located in the Front Range of Colorado. The flux of dissolved solids from LVWS is primarily controlled by interactions between snowmelt and materials derived from the local bedrock; the biomass has only a minor effect on
Authors
M. Alisa Mast, James I. Drever, Jill Baron