David W Clow (Former Employee)
Science and Products
Filter Total Items: 72
Potential climate change effects on water tables and pyrite oxidation in headwater catchments in Colorado Potential climate change effects on water tables and pyrite oxidation in headwater catchments in Colorado
A water, energy, and biogeochemical model (WEBMOD) was constructed to simulate hydrology and pyrite oxidation for the period October 1992 through September 1997. The hydrologic model simulates processes in Loch Vale, a 6.6-km² granitic watershed that drains the east side of the Continental Divide. Parameters describing pyrite oxidation were derived sulfate concentrations measured in pore...
Authors
Richard M. Webb, M. Alisa Mast, Andrew H. Manning, David W. Clow, Donald H. Campbell
Critical nitrogen deposition loads in high-elevation lakes of the western US inferred from paleolimnological records Critical nitrogen deposition loads in high-elevation lakes of the western US inferred from paleolimnological records
Critical loads of nitrogen (N) from atmospheric deposition were determined for alpine lake ecosystems in the western US using fossil diatom assemblages in lake sediment cores. Changes in diatom species over the last century were indicative of N enrichment in two areas, the eastern Sierra Nevada, starting between 1960 and 1965, and the Greater Yellowstone Ecosystem, starting in 1980. In...
Authors
J.E. Saros, David W. Clow, T. Blett, A.P. Wolfe
Changes in the timing of snowmelt and streamflow in Colorado: A response to recent warming Changes in the timing of snowmelt and streamflow in Colorado: A response to recent warming
Trends in the timing of snowmelt and associated runoff in Colorado were evaluated for the 1978-2007 water years using the regional Kendall test (RKT) on daily snow-water equivalent (SWE) data from snowpack telemetry (SNOTEL) sites and daily streamflow data from headwater streams. The RKT is a robust, nonparametric test that provides an increased power of trend detection by grouping data...
Authors
David W. Clow
Use of regression‐based models to map sensitivity of aquatic resources to atmospheric deposition in Yosemite National Park, USA Use of regression‐based models to map sensitivity of aquatic resources to atmospheric deposition in Yosemite National Park, USA
An abundance of exposed bedrock, sparse soil and vegetation, and fast hydrologic flushing rates make aquatic ecosystems in Yosemite National Park susceptible to nutrient enrichment and episodic acidification due to atmospheric deposition of nitrogen (N) and sulfur (S). In this study, multiple linear regression (MLR) models were created to estimate fall‐season nitrate and acid...
Authors
David W. Clow, Leora Nanus, Brian Huggett
Mechanisms for chemostatic behavior in catchments: implications for CO2 consumption by mineral weathering Mechanisms for chemostatic behavior in catchments: implications for CO2 consumption by mineral weathering
Concentrations of weathering products in streams often show relatively little variation compared to changes in discharge, both at event and annual scales. In this study, several hypothesized mechanisms for this “chemostatic behavior” were evaluated, and the potential for those mechanisms to influence relations between climate, weathering fluxes, and CO2 consumption via mineral weathering...
Authors
David W. Clow, M. Alisa Mast
DayCent-Chem simulations of ecological and biogeochemical processes of eight mountain ecosystems in the United States DayCent-Chem simulations of ecological and biogeochemical processes of eight mountain ecosystems in the United States
Atmospheric deposition of nitrogen (N) and sulfur (S) cause complex responses in ecosystems, from fertilization to forest ecosystem decline, freshwater eutrophication to acidification, loss of soil base cations, and alterations of disturbance regimes. DayCent-Chem, an ecosystem simulation model that combines ecosystem nutrient cycling and plant dynamics with aqueous geochemical...
Authors
Melannie D. Hartman, Jill S. Baron, David W. Clow, Irena F. Creed, Charles T. Driscoll, Holly A. Ewing, Bruce D. Haines, Jennifer Knoepp, Kate Lajtha, Dennis S. Ojima, William J. Parton, Jim Renfro, R. Bruce Robinson, Helga Van Miegroet, Kathleen C. Weathers, Mark W. Williams
Science and Products
Filter Total Items: 72
Potential climate change effects on water tables and pyrite oxidation in headwater catchments in Colorado Potential climate change effects on water tables and pyrite oxidation in headwater catchments in Colorado
A water, energy, and biogeochemical model (WEBMOD) was constructed to simulate hydrology and pyrite oxidation for the period October 1992 through September 1997. The hydrologic model simulates processes in Loch Vale, a 6.6-km² granitic watershed that drains the east side of the Continental Divide. Parameters describing pyrite oxidation were derived sulfate concentrations measured in pore...
Authors
Richard M. Webb, M. Alisa Mast, Andrew H. Manning, David W. Clow, Donald H. Campbell
Critical nitrogen deposition loads in high-elevation lakes of the western US inferred from paleolimnological records Critical nitrogen deposition loads in high-elevation lakes of the western US inferred from paleolimnological records
Critical loads of nitrogen (N) from atmospheric deposition were determined for alpine lake ecosystems in the western US using fossil diatom assemblages in lake sediment cores. Changes in diatom species over the last century were indicative of N enrichment in two areas, the eastern Sierra Nevada, starting between 1960 and 1965, and the Greater Yellowstone Ecosystem, starting in 1980. In...
Authors
J.E. Saros, David W. Clow, T. Blett, A.P. Wolfe
Changes in the timing of snowmelt and streamflow in Colorado: A response to recent warming Changes in the timing of snowmelt and streamflow in Colorado: A response to recent warming
Trends in the timing of snowmelt and associated runoff in Colorado were evaluated for the 1978-2007 water years using the regional Kendall test (RKT) on daily snow-water equivalent (SWE) data from snowpack telemetry (SNOTEL) sites and daily streamflow data from headwater streams. The RKT is a robust, nonparametric test that provides an increased power of trend detection by grouping data...
Authors
David W. Clow
Use of regression‐based models to map sensitivity of aquatic resources to atmospheric deposition in Yosemite National Park, USA Use of regression‐based models to map sensitivity of aquatic resources to atmospheric deposition in Yosemite National Park, USA
An abundance of exposed bedrock, sparse soil and vegetation, and fast hydrologic flushing rates make aquatic ecosystems in Yosemite National Park susceptible to nutrient enrichment and episodic acidification due to atmospheric deposition of nitrogen (N) and sulfur (S). In this study, multiple linear regression (MLR) models were created to estimate fall‐season nitrate and acid...
Authors
David W. Clow, Leora Nanus, Brian Huggett
Mechanisms for chemostatic behavior in catchments: implications for CO2 consumption by mineral weathering Mechanisms for chemostatic behavior in catchments: implications for CO2 consumption by mineral weathering
Concentrations of weathering products in streams often show relatively little variation compared to changes in discharge, both at event and annual scales. In this study, several hypothesized mechanisms for this “chemostatic behavior” were evaluated, and the potential for those mechanisms to influence relations between climate, weathering fluxes, and CO2 consumption via mineral weathering...
Authors
David W. Clow, M. Alisa Mast
DayCent-Chem simulations of ecological and biogeochemical processes of eight mountain ecosystems in the United States DayCent-Chem simulations of ecological and biogeochemical processes of eight mountain ecosystems in the United States
Atmospheric deposition of nitrogen (N) and sulfur (S) cause complex responses in ecosystems, from fertilization to forest ecosystem decline, freshwater eutrophication to acidification, loss of soil base cations, and alterations of disturbance regimes. DayCent-Chem, an ecosystem simulation model that combines ecosystem nutrient cycling and plant dynamics with aqueous geochemical...
Authors
Melannie D. Hartman, Jill S. Baron, David W. Clow, Irena F. Creed, Charles T. Driscoll, Holly A. Ewing, Bruce D. Haines, Jennifer Knoepp, Kate Lajtha, Dennis S. Ojima, William J. Parton, Jim Renfro, R. Bruce Robinson, Helga Van Miegroet, Kathleen C. Weathers, Mark W. Williams