David W Clow (Former Employee)
Science and Products
Filter Total Items: 72
Science needs for continued development of total nitrogen deposition budgets in the United States Science needs for continued development of total nitrogen deposition budgets in the United States
The objectives of this white paper are to describe the state of the science with respect to total Nr deposition budgets in North America and the research needed to improve these budgets from both a measurement and modeling standpoint. The document is intended to serve as a plan for TDep research activities but also, more broadly, to provide program managers, natural resource managers...
Authors
Gregory A. Wetherbee, Pamela Templar, Richard Pouyat, Stephen Decina, Brian Kerschner, Thomas Whitlow, Pamela Padgett, Donna B. Schwede, Jill Baron, David Clow, M. Mast, Graham A. Sexstone, Kristi Morris
Linking transit times to catchment sensitivity to atmospheric deposition of acidity and nitrogen in mountains of the western United States Linking transit times to catchment sensitivity to atmospheric deposition of acidity and nitrogen in mountains of the western United States
Transit times are hypothesized to influence catchment sensitivity to atmospheric deposition of acidity and nitrogen (N) because they help determine the amount of time available for infiltrating precipitation to interact with catchment soil and biota. Transit time metrics, including fraction of young water (Fyw) and mean transit time (MTT), were calculated for 11 headwater catchments in...
Authors
David Clow, M. Mast, James Sickman
Influence of climate on alpine stream chemistry and water sources Influence of climate on alpine stream chemistry and water sources
The resilience of alpine/subalpine watersheds may be viewed as the resistance of streamflow or stream chemistry to change under varying climatic conditions, which is governed by the relative size (volume) and transit time of surface and subsurface water sources. Here, we use end‐member mixing analysis in Andrews Creek, an alpine stream in Rocky Mountain National Park, Colorado, from...
Authors
Sydney Foks, Edward Stets, Kamini Singha, David Clow
Snow sublimation in mountain environments and its sensitivity to forest disturbance and climate warming Snow sublimation in mountain environments and its sensitivity to forest disturbance and climate warming
Snow sublimation is an important component of the snow mass balance, but the spatial and temporal variability of this process is not well understood in mountain environments. This study combines a process‐based snow model (SnowModel) with eddy covariance (EC) measurements to investigate (1) the spatio‐temporal variability of simulated snow sublimation with respect to station observations...
Authors
Graham A. Sexstone, David Clow, Steven Fassnacht, Glen Liston, Christopher Hiemstra, John Knowles, Colin Penn
Organic carbon burial in global lakes and reservoirs Organic carbon burial in global lakes and reservoirs
Burial in sediments removes organic carbon (OC) from the short-term biosphere-atmosphere carbon (C) cycle, and therefore prevents greenhouse gas production in natural systems. Although OC burial in lakes and reservoirs is faster than in the ocean, the magnitude of inland water OC burial is not well constrained. Here we generate the first global-scale and regionally resolved estimate of...
Authors
Raquel Mendonca, Roger Muller, David Clow, Charles Verpoorter, Peter Raymond, Lars Tranvik, Sebastian Sobek
Effects of backpacker use, pack stock trail use, and pack stock grazing on water-quality indicators, including nutrients, E. coli, hormones, and pharmaceuticals, in Yosemite National Park, USA Effects of backpacker use, pack stock trail use, and pack stock grazing on water-quality indicators, including nutrients, E. coli, hormones, and pharmaceuticals, in Yosemite National Park, USA
We investigated how visitor-use affects water quality in wilderness in Yosemite National Park. During the summers of 2012–2014, we collected and analyzed surface-water samples for water-quality indicators, including fecal indicator bacteria Escherichia coli, nutrients (nitrogen, phosphorus, carbon), suspended sediment concentration, pharmaceuticals, and hormones. Samples were collected...
Authors
Harrison Forrester, David Clow, James Roche, Alan Heyvaert, William Battaglin
Inland waters and their role in the carbon cycle of Alaska Inland waters and their role in the carbon cycle of Alaska
The magnitude of Alaska (AK) inland waters carbon (C) fluxes is likely to change in the future due to amplified climate warming impacts on the hydrology and biogeochemical processes in high latitude regions. Although current estimates of major aquatic C fluxes represent an essential baseline against which future change can be compared, a comprehensive assessment for AK has not yet been...
Authors
Sarah Stackpoole, David Butman, David Clow, Kristine Verdin, Benjamin Gaglioti, Hélène Genet, Robert Striegl
Spatial and temporal patterns of dissolved organic matter quantity and quality in the Mississippi River Basin, 1997–2013 Spatial and temporal patterns of dissolved organic matter quantity and quality in the Mississippi River Basin, 1997–2013
Recent studies have found insignificant or decreasing trends in time-series dissolved organic carbon (DOC) datasets, questioning the assumption that long-term DOC concentrations in surface waters are increasing in response to anthropogenic forcing, including climate change, land use, and atmospheric acid deposition. We used the weighted regressions on time, discharge, and season (WRTDS)...
Authors
Sarah Stackpoole, Edward G. Stets, David Clow, Douglas Burns, George Aiken, Brent Aulenbach, Irena F. Creed, Robert Hirsch, Hjalmar Laudon, Brian Pellerin, Robert Striegl
Increasing aeolian dust deposition to snowpacks in the Rocky Mountains inferred from snowpack, wet deposition, and aerosol chemistry Increasing aeolian dust deposition to snowpacks in the Rocky Mountains inferred from snowpack, wet deposition, and aerosol chemistry
Mountain snowpacks are a vital natural resource for ∼1.5 billion people in the northern Hemisphere, helping to meet human and ecological demand for water in excess of that provided by summer rain. Springtime warming and aeolian dust deposition accelerate snowmelt, increasing the risk of water shortages during late summer, when demand is greatest. While climate networks provide data that...
Authors
David Clow, Mark Williams, Paul Schuster
Comparison of methods for quantifying surface sublimation over seasonally snow-covered terrain Comparison of methods for quantifying surface sublimation over seasonally snow-covered terrain
Snow sublimation can be an important component of the snow-cover mass balance, and there is considerable interest in quantifying the role of this process within the water and energy balance of snow-covered regions. In recent years, robust eddy covariance (EC) instrumentation has been used to quantify snow sublimation over snow-covered surfaces in complex mountainous terrain. However, EC...
Authors
Graham Sexstone, David Clow, David Stannard, Steven Fassnacht
Numerical experiments to explain multiscale hydrological responses to mountain pine beetle tree mortality in a headwater watershed Numerical experiments to explain multiscale hydrological responses to mountain pine beetle tree mortality in a headwater watershed
The effects of mountain pine beetle (MPB)-induced tree mortality on a headwater hydrologic system were investigated using an integrated physical modeling framework with a high-resolution computational grid. Simulations of MPB-affected and unaffected conditions, each with identical atmospheric forcing for a normal water year, were compared at multiple scales to evaluate the effects of...
Authors
Colin Penn, Lindsay Bearup, Reed Maxwell, David Clow
Aquatic carbon cycling in the conterminous United States and implications for terrestrial carbon accounting Aquatic carbon cycling in the conterminous United States and implications for terrestrial carbon accounting
Inland water ecosystems dynamically process, transport, and sequester carbon. However, the transport of carbon through aquatic environments has not been quantitatively integrated in the context of terrestrial ecosystems. Here, we present the first integrated assessment, to our knowledge, of freshwater carbon fluxes for the conterminous United States, where 106 (range: 71–149) teragrams...
Authors
David Butman, Sarah Stackpoole, Edward G. Stets, Cory McDonald, David Clow, Robert Striegl
Science and Products
Filter Total Items: 72
Science needs for continued development of total nitrogen deposition budgets in the United States Science needs for continued development of total nitrogen deposition budgets in the United States
The objectives of this white paper are to describe the state of the science with respect to total Nr deposition budgets in North America and the research needed to improve these budgets from both a measurement and modeling standpoint. The document is intended to serve as a plan for TDep research activities but also, more broadly, to provide program managers, natural resource managers...
Authors
Gregory A. Wetherbee, Pamela Templar, Richard Pouyat, Stephen Decina, Brian Kerschner, Thomas Whitlow, Pamela Padgett, Donna B. Schwede, Jill Baron, David Clow, M. Mast, Graham A. Sexstone, Kristi Morris
Linking transit times to catchment sensitivity to atmospheric deposition of acidity and nitrogen in mountains of the western United States Linking transit times to catchment sensitivity to atmospheric deposition of acidity and nitrogen in mountains of the western United States
Transit times are hypothesized to influence catchment sensitivity to atmospheric deposition of acidity and nitrogen (N) because they help determine the amount of time available for infiltrating precipitation to interact with catchment soil and biota. Transit time metrics, including fraction of young water (Fyw) and mean transit time (MTT), were calculated for 11 headwater catchments in...
Authors
David Clow, M. Mast, James Sickman
Influence of climate on alpine stream chemistry and water sources Influence of climate on alpine stream chemistry and water sources
The resilience of alpine/subalpine watersheds may be viewed as the resistance of streamflow or stream chemistry to change under varying climatic conditions, which is governed by the relative size (volume) and transit time of surface and subsurface water sources. Here, we use end‐member mixing analysis in Andrews Creek, an alpine stream in Rocky Mountain National Park, Colorado, from...
Authors
Sydney Foks, Edward Stets, Kamini Singha, David Clow
Snow sublimation in mountain environments and its sensitivity to forest disturbance and climate warming Snow sublimation in mountain environments and its sensitivity to forest disturbance and climate warming
Snow sublimation is an important component of the snow mass balance, but the spatial and temporal variability of this process is not well understood in mountain environments. This study combines a process‐based snow model (SnowModel) with eddy covariance (EC) measurements to investigate (1) the spatio‐temporal variability of simulated snow sublimation with respect to station observations...
Authors
Graham A. Sexstone, David Clow, Steven Fassnacht, Glen Liston, Christopher Hiemstra, John Knowles, Colin Penn
Organic carbon burial in global lakes and reservoirs Organic carbon burial in global lakes and reservoirs
Burial in sediments removes organic carbon (OC) from the short-term biosphere-atmosphere carbon (C) cycle, and therefore prevents greenhouse gas production in natural systems. Although OC burial in lakes and reservoirs is faster than in the ocean, the magnitude of inland water OC burial is not well constrained. Here we generate the first global-scale and regionally resolved estimate of...
Authors
Raquel Mendonca, Roger Muller, David Clow, Charles Verpoorter, Peter Raymond, Lars Tranvik, Sebastian Sobek
Effects of backpacker use, pack stock trail use, and pack stock grazing on water-quality indicators, including nutrients, E. coli, hormones, and pharmaceuticals, in Yosemite National Park, USA Effects of backpacker use, pack stock trail use, and pack stock grazing on water-quality indicators, including nutrients, E. coli, hormones, and pharmaceuticals, in Yosemite National Park, USA
We investigated how visitor-use affects water quality in wilderness in Yosemite National Park. During the summers of 2012–2014, we collected and analyzed surface-water samples for water-quality indicators, including fecal indicator bacteria Escherichia coli, nutrients (nitrogen, phosphorus, carbon), suspended sediment concentration, pharmaceuticals, and hormones. Samples were collected...
Authors
Harrison Forrester, David Clow, James Roche, Alan Heyvaert, William Battaglin
Inland waters and their role in the carbon cycle of Alaska Inland waters and their role in the carbon cycle of Alaska
The magnitude of Alaska (AK) inland waters carbon (C) fluxes is likely to change in the future due to amplified climate warming impacts on the hydrology and biogeochemical processes in high latitude regions. Although current estimates of major aquatic C fluxes represent an essential baseline against which future change can be compared, a comprehensive assessment for AK has not yet been...
Authors
Sarah Stackpoole, David Butman, David Clow, Kristine Verdin, Benjamin Gaglioti, Hélène Genet, Robert Striegl
Spatial and temporal patterns of dissolved organic matter quantity and quality in the Mississippi River Basin, 1997–2013 Spatial and temporal patterns of dissolved organic matter quantity and quality in the Mississippi River Basin, 1997–2013
Recent studies have found insignificant or decreasing trends in time-series dissolved organic carbon (DOC) datasets, questioning the assumption that long-term DOC concentrations in surface waters are increasing in response to anthropogenic forcing, including climate change, land use, and atmospheric acid deposition. We used the weighted regressions on time, discharge, and season (WRTDS)...
Authors
Sarah Stackpoole, Edward G. Stets, David Clow, Douglas Burns, George Aiken, Brent Aulenbach, Irena F. Creed, Robert Hirsch, Hjalmar Laudon, Brian Pellerin, Robert Striegl
Increasing aeolian dust deposition to snowpacks in the Rocky Mountains inferred from snowpack, wet deposition, and aerosol chemistry Increasing aeolian dust deposition to snowpacks in the Rocky Mountains inferred from snowpack, wet deposition, and aerosol chemistry
Mountain snowpacks are a vital natural resource for ∼1.5 billion people in the northern Hemisphere, helping to meet human and ecological demand for water in excess of that provided by summer rain. Springtime warming and aeolian dust deposition accelerate snowmelt, increasing the risk of water shortages during late summer, when demand is greatest. While climate networks provide data that...
Authors
David Clow, Mark Williams, Paul Schuster
Comparison of methods for quantifying surface sublimation over seasonally snow-covered terrain Comparison of methods for quantifying surface sublimation over seasonally snow-covered terrain
Snow sublimation can be an important component of the snow-cover mass balance, and there is considerable interest in quantifying the role of this process within the water and energy balance of snow-covered regions. In recent years, robust eddy covariance (EC) instrumentation has been used to quantify snow sublimation over snow-covered surfaces in complex mountainous terrain. However, EC...
Authors
Graham Sexstone, David Clow, David Stannard, Steven Fassnacht
Numerical experiments to explain multiscale hydrological responses to mountain pine beetle tree mortality in a headwater watershed Numerical experiments to explain multiscale hydrological responses to mountain pine beetle tree mortality in a headwater watershed
The effects of mountain pine beetle (MPB)-induced tree mortality on a headwater hydrologic system were investigated using an integrated physical modeling framework with a high-resolution computational grid. Simulations of MPB-affected and unaffected conditions, each with identical atmospheric forcing for a normal water year, were compared at multiple scales to evaluate the effects of...
Authors
Colin Penn, Lindsay Bearup, Reed Maxwell, David Clow
Aquatic carbon cycling in the conterminous United States and implications for terrestrial carbon accounting Aquatic carbon cycling in the conterminous United States and implications for terrestrial carbon accounting
Inland water ecosystems dynamically process, transport, and sequester carbon. However, the transport of carbon through aquatic environments has not been quantitatively integrated in the context of terrestrial ecosystems. Here, we present the first integrated assessment, to our knowledge, of freshwater carbon fluxes for the conterminous United States, where 106 (range: 71–149) teragrams...
Authors
David Butman, Sarah Stackpoole, Edward G. Stets, Cory McDonald, David Clow, Robert Striegl