David W Clow (Former Employee)
Science and Products
Filter Total Items: 72
Evaluation of SNODAS snow depth and snow water equivalent estimates for the Colorado Rocky Mountains, USA Evaluation of SNODAS snow depth and snow water equivalent estimates for the Colorado Rocky Mountains, USA
The National Weather Service's Snow Data Assimilation (SNODAS) program provides daily, gridded estimates of snow depth, snow water equivalent (SWE), and related snow parameters at a 1-km2 resolution for the conterminous USA. In this study, SNODAS snow depth and SWE estimates were compared with independent, ground-based snow survey data in the Colorado Rocky Mountains to assess SNODAS...
Authors
David W. Clow, Leora Nanus, Kristine L. Verdin, Jeffrey Schmidt
Hydrologic, water-quality, and biological characteristics of the North Fork Flathead River, Montana, water years 2007-2008 Hydrologic, water-quality, and biological characteristics of the North Fork Flathead River, Montana, water years 2007-2008
In water year 2007, the U.S. Geological Survey, in cooperation with the National Park Service, began a 2-year study to collect hydrologic, water-quality, and biological data to provide a baseline characterization of the North Fork Flathead River from the United States-Canada border to its confluence with the Middle Fork of the Flathead River near Columbia Falls, Montana. Although mining...
Authors
Taylor J. Mills, E. William Schweiger, M. Alisa Mast, David W. Clow
Mapping critical loads of nitrogen deposition for aquatic ecosystems in the Rocky Mountains, USA Mapping critical loads of nitrogen deposition for aquatic ecosystems in the Rocky Mountains, USA
Spatially explicit estimates of critical loads of nitrogen (N) deposition (CLNdep) for nutrient enrichment in aquatic ecosystems were developed for the Rocky Mountains, USA, using a geostatistical approach. The lowest CLNdep estimates (3 kg N ha−1 yr−1), resulting in CLNdep exceedances ≥1.5 ± 1 kg N ha−1 yr−1. CLNdep and CLNdep exceedances exhibit substantial spatial variability related...
Authors
Leora Nanus, David W. Clow, Jasmine E. Saros, Verlin C. Stephens, Donald H. Campbell
Response of lake chemistry to changes in atmospheric deposition and climate in three high-elevation wilderness areas of Colorado Response of lake chemistry to changes in atmospheric deposition and climate in three high-elevation wilderness areas of Colorado
Trends in precipitation chemistry and hydrologic and climatic data were examined as drivers of long-term changes in the chemical composition of high-elevation lakes in three wilderness areas in Colorado during 1985–2008. Sulfate concentrations in precipitation decreased at a rate of −0.15 to −0.55 μeq/l/year at 10 high-elevation National Atmospheric Deposition Program stations in the...
Authors
M. Alisa Mast, John T. Turk, David W. Clow, Donald D. Campbell
Assessing possible visitor-use impacts on water quality in Yosemite National Park, California Assessing possible visitor-use impacts on water quality in Yosemite National Park, California
There is concern that visitor-use associated activities, such as bathing, dish washing, wastewater production, and stock animal use near lakes and streams, could cause degradation of water quality in Yosemite National Park. A study was conducted during 2004–2007 to assess patterns in nutrient and Escherichia coli (E. coli) concentrations in the Merced and Tuolumne Rivers and characterize...
Authors
David W. Clow, Rachael S. Peavler, Jim Roche, Anna K. Panorska, James M. Thomas, Steve Smith
Responses of soil and water chemistry to mountain pine beetle induced tree mortality in Grand County, Colorado, USA Responses of soil and water chemistry to mountain pine beetle induced tree mortality in Grand County, Colorado, USA
Pine forest in northern Colorado and southern Wyoming, USA, are experiencing the most severe mountain pine beetle epidemic in recorded history, and possible degradation of drinking-water quality is a major concern. The objective of this study was to investigate possible changes in soil and water chemistry in Grand County, Colorado in response to the epidemic, and to identify major...
Authors
David W. Clow, Charles Rhoades, Jenny S. Briggs, Megan K. Caldwell, William M. Lewis
Science and Products
Filter Total Items: 72
Evaluation of SNODAS snow depth and snow water equivalent estimates for the Colorado Rocky Mountains, USA Evaluation of SNODAS snow depth and snow water equivalent estimates for the Colorado Rocky Mountains, USA
The National Weather Service's Snow Data Assimilation (SNODAS) program provides daily, gridded estimates of snow depth, snow water equivalent (SWE), and related snow parameters at a 1-km2 resolution for the conterminous USA. In this study, SNODAS snow depth and SWE estimates were compared with independent, ground-based snow survey data in the Colorado Rocky Mountains to assess SNODAS...
Authors
David W. Clow, Leora Nanus, Kristine L. Verdin, Jeffrey Schmidt
Hydrologic, water-quality, and biological characteristics of the North Fork Flathead River, Montana, water years 2007-2008 Hydrologic, water-quality, and biological characteristics of the North Fork Flathead River, Montana, water years 2007-2008
In water year 2007, the U.S. Geological Survey, in cooperation with the National Park Service, began a 2-year study to collect hydrologic, water-quality, and biological data to provide a baseline characterization of the North Fork Flathead River from the United States-Canada border to its confluence with the Middle Fork of the Flathead River near Columbia Falls, Montana. Although mining...
Authors
Taylor J. Mills, E. William Schweiger, M. Alisa Mast, David W. Clow
Mapping critical loads of nitrogen deposition for aquatic ecosystems in the Rocky Mountains, USA Mapping critical loads of nitrogen deposition for aquatic ecosystems in the Rocky Mountains, USA
Spatially explicit estimates of critical loads of nitrogen (N) deposition (CLNdep) for nutrient enrichment in aquatic ecosystems were developed for the Rocky Mountains, USA, using a geostatistical approach. The lowest CLNdep estimates (3 kg N ha−1 yr−1), resulting in CLNdep exceedances ≥1.5 ± 1 kg N ha−1 yr−1. CLNdep and CLNdep exceedances exhibit substantial spatial variability related...
Authors
Leora Nanus, David W. Clow, Jasmine E. Saros, Verlin C. Stephens, Donald H. Campbell
Response of lake chemistry to changes in atmospheric deposition and climate in three high-elevation wilderness areas of Colorado Response of lake chemistry to changes in atmospheric deposition and climate in three high-elevation wilderness areas of Colorado
Trends in precipitation chemistry and hydrologic and climatic data were examined as drivers of long-term changes in the chemical composition of high-elevation lakes in three wilderness areas in Colorado during 1985–2008. Sulfate concentrations in precipitation decreased at a rate of −0.15 to −0.55 μeq/l/year at 10 high-elevation National Atmospheric Deposition Program stations in the...
Authors
M. Alisa Mast, John T. Turk, David W. Clow, Donald D. Campbell
Assessing possible visitor-use impacts on water quality in Yosemite National Park, California Assessing possible visitor-use impacts on water quality in Yosemite National Park, California
There is concern that visitor-use associated activities, such as bathing, dish washing, wastewater production, and stock animal use near lakes and streams, could cause degradation of water quality in Yosemite National Park. A study was conducted during 2004–2007 to assess patterns in nutrient and Escherichia coli (E. coli) concentrations in the Merced and Tuolumne Rivers and characterize...
Authors
David W. Clow, Rachael S. Peavler, Jim Roche, Anna K. Panorska, James M. Thomas, Steve Smith
Responses of soil and water chemistry to mountain pine beetle induced tree mortality in Grand County, Colorado, USA Responses of soil and water chemistry to mountain pine beetle induced tree mortality in Grand County, Colorado, USA
Pine forest in northern Colorado and southern Wyoming, USA, are experiencing the most severe mountain pine beetle epidemic in recorded history, and possible degradation of drinking-water quality is a major concern. The objective of this study was to investigate possible changes in soil and water chemistry in Grand County, Colorado in response to the epidemic, and to identify major...
Authors
David W. Clow, Charles Rhoades, Jenny S. Briggs, Megan K. Caldwell, William M. Lewis