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Mark M Dornblaser (Former Employee)

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A boat docked near the Shingobee Headwaters research station.

Shingobee Headwaters Aquatic Ecosystems Project (SHAEP)

For 43 years, the Shingobee Headwaters Aquatic Ecosystems Project (SHAEP) brought together scientists from the USGS along with students and professors from universities in Minnesota, North Dakota, Wisconsin, and California to study the physical, chemical, and biological processes of lakes, wetlands, and streams at local and watershed scales. In early 2022, The University of Minnesota and Bemidji...
By
Water Resources Mission Area
link

Shingobee Headwaters Aquatic Ecosystems Project (SHAEP)

For 43 years, the Shingobee Headwaters Aquatic Ecosystems Project (SHAEP) brought together scientists from the USGS along with students and professors from universities in Minnesota, North Dakota, Wisconsin, and California to study the physical, chemical, and biological processes of lakes, wetlands, and streams at local and watershed scales. In early 2022, The University of Minnesota and Bemidji...
Learn More

Discrete and high frequency water quality data for Allequash Creek, Wisconsin, WY 2019-2021

This data set is a compilation of discrete and high frequency water quality data from sites on Allequash Creek in Wisconsin, and within the Allequash Creek watershed, for the water years (WY) 2019-2021.
By
Water Resources Mission Area

Wetland Stream Water Quality Data for West Twin Creek, AK, Allequash Creek, WI, and Big Thompson River, CO, 2010-2020

This dataset includes discrete water quality and discharge data for three streams that flow through wetlands. There are two measurement and sampling locations on each stream: one immediately upstream from the wetland and one immediately downstream from the wetland. Measurements and sample collection occurred in 2010 and 2011 at West Twin Creek, AK; in 2019 and 2020 at Allequash Creek, WI; and in 2
By
Water Resources Mission Area, Climate Research and Development Program

Water quality and gas fluxes of Interior Alaska (2014-2018)

This product consists of multiple tabular datasets and associated metadata of water quality information related to rivers, streams, and lakes in the Yukon River watershed between 2014 and 2018. This data release is apart of the National Aeronautics and Space Administration (NASA) funded Arctic-Boreal Vulnerability Experiment (ABoVE) and is an assessment of water quality and greenhouse gas fluxes w
By
Water Resources Mission Area
Image: Instrumentation Array, Beaver Creek Near Michael Lake, Alaska
Instrumentation Array, Beaver Creek Near Michael Lake, Alaska
Instrumentation Array, Beaver Creek Near Michael Lake, Alaska
Image: Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska
Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska
Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska
Image: Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Panoramic image of ice break up on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Panoramic image of ice break up on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Spring breakup on May 21 on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Spring breakup on May 21 on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Aerial of Beaver Creek, Alaska
Aerial of Beaver Creek, Alaska
Aerial of Beaver Creek, Alaska
Image: Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aquatic ecosystems make a difference in the carbon cycle. The location in this photo is located near Beaver, Alaska approximately 100 miles north of Fairbanks.

By
Ecosystems, Communications and Publishing
Image: Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aquatic ecosystems make a difference in the carbon cycle. The location in this photo is located near Beaver, Alaska approximately 100 miles north of Fairbanks.

By
Ecosystems, Communications and Publishing
Image: Fireweed and Beaver Creek, Alaska
Fireweed and Beaver Creek, Alaska
Fireweed and Beaver Creek, Alaska
Image: Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed gains a foothold in a burn area of the White Mountains in Alaska.

By
Natural Hazards, Communications and Publishing
Image: Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed gains a foothold in a burn area of the White Mountains in Alaska.

By
Natural Hazards, Communications and Publishing
Image: Rainbow Over Yukon River, Eagle, Alaska, June 2002
Rainbow Over Yukon River, Eagle, Alaska, June 2002
Rainbow Over Yukon River, Eagle, Alaska, June 2002
Image: Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Eagle was our put-in point for our first synoptic cruise down the Yukon River.

By
Alaska Science Center, Communications and Publishing
Image: Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Eagle was our put-in point for our first synoptic cruise down the Yukon River.

By
Alaska Science Center, Communications and Publishing
Filter Total Items: 35

Knowledge gaps and opportunities in water-quality drivers of aquatic ecosystem health

This report identifies key scientific gaps that limit our ability to predict water quality effects on health of aquatic ecosystems and proposes approaches to address those gaps. Topics considered include (1) coupled nutrient-carbon cycle processes and related ecological-flow-regime drivers of ecosystem health, (2) anthropogenic and geogenic toxin bioexposure, (3) fine sediment drivers of aquatic e
By
Water Resources Mission Area

Dissolved carbon export by large river systems is influenced by source area heterogeneity

Rivers and streams export inorganic and organic carbon derived from contributing landscapes and so downstream carbon fluxes are important quantitative indicators of change in ecosystem function and for the full accounting of terrestrial carbon budgets. Carbon concentration-discharge (C-Q) relationships in rivers provide important information about carbon source and behavior in watersheds and are u
Authors
Edward G. Stets, Robert G. Striegl, Kimberly Wickland, Mark Dornblaser, Sydney Foks
By
Water Resources Mission Area, Climate Research and Development Program

Anthropogenic landcover impacts fluvial dissolved organic matter composition in the Upper Mississippi River Basin

Landcover changes have altered the natural carbon cycle; however, most landcover studies focus on either forest conversion to agriculture or urban, rarely both. We present differences in dissolved organic carbon (DOC) concentrations and dissolved organic matter (DOM) molecular composition within Upper Mississippi River Basin low order streams and rivers draining one of three dominant landcovers (f
Authors
Derrick R. Vaughn, Anne M. Kellerman, Kimberly Wickland, Robert G. Striegl, David C. Podgorski, Jon R. Hawkings, Jaap Nienhuis, Mark Dornblaser, Edward G. Stets, Robert G. M. Spencer
By
Water Resources Mission Area, Climate Research and Development Program, Land Change Science Program

Hydrologic and landscape controls on dissolved organic matter composition across western North American Arctic lakes

Northern high-latitude lakes are hotspots for cycling dissolved organic carbon (DOC) inputs from allochthonous sources to the atmosphere. However, the spatial distribution of lake dissolved organic matter (DOM) is largely unknown across Arctic-boreal regions with respect to the surrounding landscape. We expand on regional studies of northern high-latitude DOM composition by integrating DOC concent
Authors
Martin R. Kurek, Fenix Garcia-Tigreros, Kimberly Wickland, Karen E. Frey, Mark Dornblaser, Robert G. Striegl, Sydney F. Niles, Amy M. McKenna, Pieter J.K Aukes, Ethan D. Kyzivat, Chao Wang, Tamlin M. Pavelsky, Laurence C. Smith, Sherry L. Schiff, David Butman, Robert G.M. Spencer
By
Water Resources Mission Area

The importance of lake emergent aquatic vegetation for estimating Arctic-boreal methane emissions

Areas of lakes that support emergent aquatic vegetation emit disproportionately more methane than open water but are under-represented in upscaled estimates of lake greenhouse gas emissions. These shallow areas are typically less than ∼1.5 m deep and can be detected with synthetic aperture radar (SAR). To assess the importance of lake emergent vegetation (LEV) zones to landscape-scale methane emis
Authors
Ethan D. Kyzivat, Laurence C. Smith, Fenix Garcia-Tigreros, Chang Huang, Chao Wang, Theodore Langhorst, Jessica V. Fayne, Merritt E. Harlan, Yuta Ishitsuka, Dongmei Feng, Wayana Dolan, Lincoln H. Pitcher, Kimberly Wickland, Mark Dornblaser, Robert G. Striegl, Tamlin M. Pavelsky, David E. Butman, Colin J. Gleason
By
Ecosystems Mission Area, Water Resources Mission Area, Cooperative Research Units, Geosciences and Environmental Change Science Center

Spatiotemporal dynamics of CO2 gas exchange from headwater mountain streams

Mountain streams play an important role in the global carbon cycle by transporting, metabolizing, and exchanging carbon they receive from the terrestrial environment. The rates at which these processes occur remain highly uncertain because of a paucity of observations and the difficulty of measuring gas exchange rates in steep, turbulent mountain streams. This uncertainty is compounded by large te

Authors
David W. Clow, Robert G. Striegl, Mark Dornblaser
By
Water Resources Mission Area, Climate Research and Development Program, Land Change Science Program, Colorado Water Science Center

Storm-scale and seasonal dynamics of carbon export from a nested subarctic watershed underlain by permafrost

Subarctic catchments underlain by permafrost sequester a major stock of frozen organic carbon (C), which may be mobilized as the Arctic warms. Warming can impact C export from thawing soils by altering the depth and timing of runoff related to changing storm and fire regimes and altered soil thaw depths. We investigated C export in a first order headwater stream (West Twin Creek) and its receiving
Authors
Joshua C. Koch, Mark Dornblaser, Rob Striegl
By
Ecosystems Mission Area, Alaska Science Center, Wildland Fire Science

USGS permafrost research determines the risks of permafrost thaw to biologic and hydrologic resources

The U.S. Geological Survey (USGS), in collaboration with university, Federal, Tribal, and independent partners, conducts fundamental research on the distribution, vulnerability, and importance of permafrost in arctic and boreal ecosystems. Scientists, land managers, and policy makers use USGS data to help make decisions for development, wildlife habitat, and other needs. Native villages and cities
Authors
Mark P. Waldrop, Lesleigh Anderson, Mark Dornblaser, Li H. Erikson, Ann E. Gibbs, Nicole M. Herman-Mercer, Stephanie R. James, Miriam C. Jones, Joshua C. Koch, Mary-Cathrine Leewis, Kristen L. Manies, Burke J. Minsley, Neal J. Pastick, Vijay Patil, Frank Urban, Michelle A. Walvoord, Kimberly P. Wickland, Christian Zimmerman
By
Natural Hazards Mission Area, Water Resources Mission Area, Climate Research and Development Program, Coastal and Marine Hazards and Resources Program, Land Change Science Program, Volcano Hazards Program, Earth Resources Observation and Science (EROS) Center , Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, Pacific Coastal and Marine Science Center, Volcano Science Center

Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska

Arctic and boreal lake greenhouse gas emissions (GHG) are an important component of regional carbon (C) budgets. Yet the magnitude and seasonal patterns of lake GHG emissions are poorly constrained, because sampling is limited in these remote landscapes, particularly during winter and shoulder seasons. To better define patterns of under ice GHG content (and emissions potential at spring thaw), we
Authors
Madeline O'Dwyer, David Butman, Robert G. Striegl, Mark M. Dornblaser, Kimberly P. Wickland, Catherine D. Kuhn, Matthew J. Bogard
By
Water Resources Mission Area

Satellite and airborne remote sensing of gross primary productivity in boreal Alaskan lakes

In terrestrial and marine ecosystems, remote sensing has been used to estimate gross primary productivity (GPP) for decades, but few applications exist for shallow freshwater ecosystems.Here we show field-based GPP correlates with satellite and airborne lake color across a range of optically and limnologically diverse lakes in interior Alaska. A strong relationship between in situ GPP derived from
Authors
Catherine D. Kuhn, Matthew J. Bogard, Sarah Ellen Johnston, Aji John, Eric Vermote, Rob Spencer, Mark M. Dornblaser, Kimberly P. Wickland, Robert G. Striegl, David Butman
By
Water Resources Mission Area

Hydrologic connectivity determines dissolved organic matter biogeochemistry in northern high-latitude lakes

Northern high‐latitude lakes are undergoing climate‐induced changes including shifts in their hydrologic connectivity with terrestrial ecosystems. How this will impact dissolved organic matter (DOM) biogeochemistry remains uncertain. We examined the drivers of DOM composition for lakes in the Yukon Flats Basin in Alaska, an arid region of low relief that is characteristic of over one‐quarter of ci
Authors
Sarah Ellen Johnston, Robert G. Striegl, Matthew J. Bogard, Mark M. Dornblaser, David E. Butman, Anne M. Kellerman, Kimberly P. Wickland, David C. Podgorski, Robert G. M. Spencer
By
Water Resources Mission Area

Constraining dissolved organic matter sources and temporal variability in a model sub-Arctic lake

Circumpolar lakes comprise ~ 1.4 million km2 of arctic and subarctic landscapes and are vulnerable to change in vegetation, permafrost distribution, and hydrological conditions in response to climate warming. However, the composition and cycling of dissolved organic matter (DOM) is poorly understood for these lakes because most are remote and unstudied. The goal of this study was to assess timesca
Authors
Sarah Ellen Johnston, Matthew J. Bogard, Jennifer A. Rogers, David Butman, Robert G. Striegl, Mark M. Dornblaser, Robert G. M. Spencer
By
Water Resources Mission Area

Science and Products

link
A boat docked near the Shingobee Headwaters research station.

Shingobee Headwaters Aquatic Ecosystems Project (SHAEP)

For 43 years, the Shingobee Headwaters Aquatic Ecosystems Project (SHAEP) brought together scientists from the USGS along with students and professors from universities in Minnesota, North Dakota, Wisconsin, and California to study the physical, chemical, and biological processes of lakes, wetlands, and streams at local and watershed scales. In early 2022, The University of Minnesota and Bemidji...
By
Water Resources Mission Area
link

Shingobee Headwaters Aquatic Ecosystems Project (SHAEP)

For 43 years, the Shingobee Headwaters Aquatic Ecosystems Project (SHAEP) brought together scientists from the USGS along with students and professors from universities in Minnesota, North Dakota, Wisconsin, and California to study the physical, chemical, and biological processes of lakes, wetlands, and streams at local and watershed scales. In early 2022, The University of Minnesota and Bemidji...
Learn More

Discrete and high frequency water quality data for Allequash Creek, Wisconsin, WY 2019-2021

This data set is a compilation of discrete and high frequency water quality data from sites on Allequash Creek in Wisconsin, and within the Allequash Creek watershed, for the water years (WY) 2019-2021.
By
Water Resources Mission Area

Wetland Stream Water Quality Data for West Twin Creek, AK, Allequash Creek, WI, and Big Thompson River, CO, 2010-2020

This dataset includes discrete water quality and discharge data for three streams that flow through wetlands. There are two measurement and sampling locations on each stream: one immediately upstream from the wetland and one immediately downstream from the wetland. Measurements and sample collection occurred in 2010 and 2011 at West Twin Creek, AK; in 2019 and 2020 at Allequash Creek, WI; and in 2
By
Water Resources Mission Area, Climate Research and Development Program

Water quality and gas fluxes of Interior Alaska (2014-2018)

This product consists of multiple tabular datasets and associated metadata of water quality information related to rivers, streams, and lakes in the Yukon River watershed between 2014 and 2018. This data release is apart of the National Aeronautics and Space Administration (NASA) funded Arctic-Boreal Vulnerability Experiment (ABoVE) and is an assessment of water quality and greenhouse gas fluxes w
By
Water Resources Mission Area
Image: Instrumentation Array, Beaver Creek Near Michael Lake, Alaska
Instrumentation Array, Beaver Creek Near Michael Lake, Alaska
Instrumentation Array, Beaver Creek Near Michael Lake, Alaska
Image: Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation Array, Beaver Creek Near Michael Lake, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska
Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska
Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska
Image: Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation Array, Beaver Creek Above Victoria Creek, Alaska

Instrumentation array with a YSI multiparameter sonde, a dissolved CO2 sensor, and a CDOM sensor.

By
Alaska Science Center, Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Panoramic image of ice break up on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Panoramic image of ice break up on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Ice Out on Yukon River, Pilot Station, Alaska
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Spring breakup on May 21 on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Ice Out on Yukon River, Pilot Station, Alaska

Spring breakup on May 21 on the Yukon River at Pilot Station, Alaska.

By
Communications and Publishing
Image: Aerial of Beaver Creek, Alaska
Aerial of Beaver Creek, Alaska
Aerial of Beaver Creek, Alaska
Image: Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aquatic ecosystems make a difference in the carbon cycle. The location in this photo is located near Beaver, Alaska approximately 100 miles north of Fairbanks.

By
Ecosystems, Communications and Publishing
Image: Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aerial of Beaver Creek, Alaska

Aquatic ecosystems make a difference in the carbon cycle. The location in this photo is located near Beaver, Alaska approximately 100 miles north of Fairbanks.

By
Ecosystems, Communications and Publishing
Image: Fireweed and Beaver Creek, Alaska
Fireweed and Beaver Creek, Alaska
Fireweed and Beaver Creek, Alaska
Image: Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed gains a foothold in a burn area of the White Mountains in Alaska.

By
Natural Hazards, Communications and Publishing
Image: Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed and Beaver Creek, Alaska

Fireweed gains a foothold in a burn area of the White Mountains in Alaska.

By
Natural Hazards, Communications and Publishing
Image: Rainbow Over Yukon River, Eagle, Alaska, June 2002
Rainbow Over Yukon River, Eagle, Alaska, June 2002
Rainbow Over Yukon River, Eagle, Alaska, June 2002
Image: Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Eagle was our put-in point for our first synoptic cruise down the Yukon River.

By
Alaska Science Center, Communications and Publishing
Image: Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Rainbow Over Yukon River, Eagle, Alaska, June 2002

Eagle was our put-in point for our first synoptic cruise down the Yukon River.

By
Alaska Science Center, Communications and Publishing
Filter Total Items: 35

Knowledge gaps and opportunities in water-quality drivers of aquatic ecosystem health

This report identifies key scientific gaps that limit our ability to predict water quality effects on health of aquatic ecosystems and proposes approaches to address those gaps. Topics considered include (1) coupled nutrient-carbon cycle processes and related ecological-flow-regime drivers of ecosystem health, (2) anthropogenic and geogenic toxin bioexposure, (3) fine sediment drivers of aquatic e
By
Water Resources Mission Area

Dissolved carbon export by large river systems is influenced by source area heterogeneity

Rivers and streams export inorganic and organic carbon derived from contributing landscapes and so downstream carbon fluxes are important quantitative indicators of change in ecosystem function and for the full accounting of terrestrial carbon budgets. Carbon concentration-discharge (C-Q) relationships in rivers provide important information about carbon source and behavior in watersheds and are u
Authors
Edward G. Stets, Robert G. Striegl, Kimberly Wickland, Mark Dornblaser, Sydney Foks
By
Water Resources Mission Area, Climate Research and Development Program

Anthropogenic landcover impacts fluvial dissolved organic matter composition in the Upper Mississippi River Basin

Landcover changes have altered the natural carbon cycle; however, most landcover studies focus on either forest conversion to agriculture or urban, rarely both. We present differences in dissolved organic carbon (DOC) concentrations and dissolved organic matter (DOM) molecular composition within Upper Mississippi River Basin low order streams and rivers draining one of three dominant landcovers (f
Authors
Derrick R. Vaughn, Anne M. Kellerman, Kimberly Wickland, Robert G. Striegl, David C. Podgorski, Jon R. Hawkings, Jaap Nienhuis, Mark Dornblaser, Edward G. Stets, Robert G. M. Spencer
By
Water Resources Mission Area, Climate Research and Development Program, Land Change Science Program

Hydrologic and landscape controls on dissolved organic matter composition across western North American Arctic lakes

Northern high-latitude lakes are hotspots for cycling dissolved organic carbon (DOC) inputs from allochthonous sources to the atmosphere. However, the spatial distribution of lake dissolved organic matter (DOM) is largely unknown across Arctic-boreal regions with respect to the surrounding landscape. We expand on regional studies of northern high-latitude DOM composition by integrating DOC concent
Authors
Martin R. Kurek, Fenix Garcia-Tigreros, Kimberly Wickland, Karen E. Frey, Mark Dornblaser, Robert G. Striegl, Sydney F. Niles, Amy M. McKenna, Pieter J.K Aukes, Ethan D. Kyzivat, Chao Wang, Tamlin M. Pavelsky, Laurence C. Smith, Sherry L. Schiff, David Butman, Robert G.M. Spencer
By
Water Resources Mission Area

The importance of lake emergent aquatic vegetation for estimating Arctic-boreal methane emissions

Areas of lakes that support emergent aquatic vegetation emit disproportionately more methane than open water but are under-represented in upscaled estimates of lake greenhouse gas emissions. These shallow areas are typically less than ∼1.5 m deep and can be detected with synthetic aperture radar (SAR). To assess the importance of lake emergent vegetation (LEV) zones to landscape-scale methane emis
Authors
Ethan D. Kyzivat, Laurence C. Smith, Fenix Garcia-Tigreros, Chang Huang, Chao Wang, Theodore Langhorst, Jessica V. Fayne, Merritt E. Harlan, Yuta Ishitsuka, Dongmei Feng, Wayana Dolan, Lincoln H. Pitcher, Kimberly Wickland, Mark Dornblaser, Robert G. Striegl, Tamlin M. Pavelsky, David E. Butman, Colin J. Gleason
By
Ecosystems Mission Area, Water Resources Mission Area, Cooperative Research Units, Geosciences and Environmental Change Science Center

Spatiotemporal dynamics of CO2 gas exchange from headwater mountain streams

Mountain streams play an important role in the global carbon cycle by transporting, metabolizing, and exchanging carbon they receive from the terrestrial environment. The rates at which these processes occur remain highly uncertain because of a paucity of observations and the difficulty of measuring gas exchange rates in steep, turbulent mountain streams. This uncertainty is compounded by large te

Authors
David W. Clow, Robert G. Striegl, Mark Dornblaser
By
Water Resources Mission Area, Climate Research and Development Program, Land Change Science Program, Colorado Water Science Center

Storm-scale and seasonal dynamics of carbon export from a nested subarctic watershed underlain by permafrost

Subarctic catchments underlain by permafrost sequester a major stock of frozen organic carbon (C), which may be mobilized as the Arctic warms. Warming can impact C export from thawing soils by altering the depth and timing of runoff related to changing storm and fire regimes and altered soil thaw depths. We investigated C export in a first order headwater stream (West Twin Creek) and its receiving
Authors
Joshua C. Koch, Mark Dornblaser, Rob Striegl
By
Ecosystems Mission Area, Alaska Science Center, Wildland Fire Science

USGS permafrost research determines the risks of permafrost thaw to biologic and hydrologic resources

The U.S. Geological Survey (USGS), in collaboration with university, Federal, Tribal, and independent partners, conducts fundamental research on the distribution, vulnerability, and importance of permafrost in arctic and boreal ecosystems. Scientists, land managers, and policy makers use USGS data to help make decisions for development, wildlife habitat, and other needs. Native villages and cities
Authors
Mark P. Waldrop, Lesleigh Anderson, Mark Dornblaser, Li H. Erikson, Ann E. Gibbs, Nicole M. Herman-Mercer, Stephanie R. James, Miriam C. Jones, Joshua C. Koch, Mary-Cathrine Leewis, Kristen L. Manies, Burke J. Minsley, Neal J. Pastick, Vijay Patil, Frank Urban, Michelle A. Walvoord, Kimberly P. Wickland, Christian Zimmerman
By
Natural Hazards Mission Area, Water Resources Mission Area, Climate Research and Development Program, Coastal and Marine Hazards and Resources Program, Land Change Science Program, Volcano Hazards Program, Earth Resources Observation and Science (EROS) Center , Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, Pacific Coastal and Marine Science Center, Volcano Science Center

Patterns and isotopic composition of greenhouse gases under ice in lakes of interior Alaska

Arctic and boreal lake greenhouse gas emissions (GHG) are an important component of regional carbon (C) budgets. Yet the magnitude and seasonal patterns of lake GHG emissions are poorly constrained, because sampling is limited in these remote landscapes, particularly during winter and shoulder seasons. To better define patterns of under ice GHG content (and emissions potential at spring thaw), we
Authors
Madeline O'Dwyer, David Butman, Robert G. Striegl, Mark M. Dornblaser, Kimberly P. Wickland, Catherine D. Kuhn, Matthew J. Bogard
By
Water Resources Mission Area

Satellite and airborne remote sensing of gross primary productivity in boreal Alaskan lakes

In terrestrial and marine ecosystems, remote sensing has been used to estimate gross primary productivity (GPP) for decades, but few applications exist for shallow freshwater ecosystems.Here we show field-based GPP correlates with satellite and airborne lake color across a range of optically and limnologically diverse lakes in interior Alaska. A strong relationship between in situ GPP derived from
Authors
Catherine D. Kuhn, Matthew J. Bogard, Sarah Ellen Johnston, Aji John, Eric Vermote, Rob Spencer, Mark M. Dornblaser, Kimberly P. Wickland, Robert G. Striegl, David Butman
By
Water Resources Mission Area

Hydrologic connectivity determines dissolved organic matter biogeochemistry in northern high-latitude lakes

Northern high‐latitude lakes are undergoing climate‐induced changes including shifts in their hydrologic connectivity with terrestrial ecosystems. How this will impact dissolved organic matter (DOM) biogeochemistry remains uncertain. We examined the drivers of DOM composition for lakes in the Yukon Flats Basin in Alaska, an arid region of low relief that is characteristic of over one‐quarter of ci
Authors
Sarah Ellen Johnston, Robert G. Striegl, Matthew J. Bogard, Mark M. Dornblaser, David E. Butman, Anne M. Kellerman, Kimberly P. Wickland, David C. Podgorski, Robert G. M. Spencer
By
Water Resources Mission Area

Constraining dissolved organic matter sources and temporal variability in a model sub-Arctic lake

Circumpolar lakes comprise ~ 1.4 million km2 of arctic and subarctic landscapes and are vulnerable to change in vegetation, permafrost distribution, and hydrological conditions in response to climate warming. However, the composition and cycling of dissolved organic matter (DOM) is poorly understood for these lakes because most are remote and unstudied. The goal of this study was to assess timesca
Authors
Sarah Ellen Johnston, Matthew J. Bogard, Jennifer A. Rogers, David Butman, Robert G. Striegl, Mark M. Dornblaser, Robert G. M. Spencer
By
Water Resources Mission Area
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