Mark M Dornblaser (Former Employee)
Science and Products
Filter Total Items: 35
Negligible cycling of terrestrial carbon in many lakes of the arid circumpolar landscape
High-latitude environments store nearly half of the planet’s below-ground organic carbon (OC), mostly in perennially frozen permafrost soils. Climatic changes drive increased export of terrestrial OC into many aquatic networks, yet the role that circumpolar lakes play in mineralizing this carbon is unclear. Here we directly evaluate ecosystem-scale OC cycling for lakes of interior Alaska. This ari
Authors
Matthew J. Bogard, Catherine D. Kuhn, Sarah Ellen Johnston, Robert G. Striegl, Gordon W. Holtgrieve, Mark M. Dornblaser, Robert G. M. Spencer, Kimberly P. Wickland, David E. Butman
Limited nitrate retention capacity in the Upper Mississippi River
The Mississippi River and other large rivers have the potential to regulate nitrogen export from terrestrial landscapes, and thus mitigate eutrophication in downstream aquatic ecosystems. In large rivers, human-constructed impoundments and connected backwaters may facilitate nitrogen removal; however, the capacity of these features is poorly quantified and incompletely incorporated into model fram
Authors
Luke C. Loken, John T. Crawford, Mark M. Dornblaser, Robert G. Striegl, Jeffrey N. Houser, Peter A Turner, Emily H. Stanley
Methane in groundwater from a leaking gas well, Piceance Basin, Colorado, USA
Site-specific and regional analysis of time-series hydrologic and geochemical data collected from 15 monitoring wells in the Piceance Basin indicated that a leaking gas well contaminated shallow groundwater with thermogenic methane. The gas well was drilled in 1956 and plugged and abandoned in 1990. Chemical and isotopic data showed the thermogenic methane was not from mixing of gas-rich formation
Authors
Peter B. McMahon, Judith C. Thomas, John T. Crawford, Mark M. Dornblaser, Andrew G. Hunt
CO2 time series patterns in contrasting headwater streams of North America
We explored the underlying patterns of temporal stream CO2 partial pressure (pCO2) variability using highfrequency sensors in seven disparate headwater streams distributed across the northern hemisphere. We also compared this dataset of [40,000 pCO2 records with other published records from lotic systems. Individual stream sites exhibited relatively distinct pCO2 patterns over time with few consis
Authors
John T. Crawford, Emily H. Stanley, Mark M. Dornblaser, Robert G. Striegl
Basin scale controls on CO2 and CH4 emissions from the Upper Mississippi River
The Upper Mississippi River, engineered for river navigation in the 1930s, includes a series of low-head dams and navigation pools receiving elevated sediment and nutrient loads from the mostly agricultural basin. Using high-resolution, spatially resolved water quality sensor measurements along 1385 river kilometers, we show that primary productivity and organic matter accumulation affect river ca
Authors
John T. Crawford, Luke C. Loken, Emily H. Stanley, Edward G. Stets, Mark M. Dornblaser, Robert G. Striegl
Source limitation of carbon gas emissions in high-elevation mountain streams and lakes
Inland waters are an important component of the global carbon cycle through transport, storage, and direct emissions of CO2 and CH4 to the atmosphere. Despite predictions of high physical gas exchange rates due to turbulent flows and ubiquitous supersaturation of CO2—and perhaps also CH4—patterns of gas emissions are essentially undocumented for high mountain ecosystems. Much like other headwater
Authors
John T. Crawford, Mark M. Dornblaser, Emily H. Stanley, David W. Clow, Robert G. Striegl
Switching predominance of organic versus inorganic carbon exports from an intermediate-size subarctic watershed
Hydrologic exports of dissolved inorganic and organic carbon (DIC, DOC) reflect permafrost conditions in arctic and subarctic river basins. DIC yields in particular, increase with decreased permafrost extent. We investigated the influence of permafrost extent on DIC and DOC yield in a tributary of the Yukon River, where the upper watershed has continuous permafrost and the lower watershed has disc
Authors
Mark M. Dornblaser, Robert G. Striegl
Using dissolved organic matter age and composition to detect permafrost thaw in boreal watersheds of interior Alaska
Recent warming at high latitudes has accelerated permafrost thaw, which can modify soil carbon dynamics and watershed hydrology. The flux and composition of dissolved organic matter (DOM) from soils to rivers are sensitive to permafrost configuration and its impact on subsurface hydrology and groundwater discharge. Here, we evaluate the utility of DOM composition and age as a tool for detecting pe
Authors
Jonathan A. O'Donnell, George R. Aiken, Michelle Ann Walvoord, Peter A. Raymond, Kenna D. Butler, Mark M. Dornblaser, Katherine Heckman
Emissions of carbon dioxide and methane from a headwater stream network of interior Alaska
Boreal ecosystems store significant quantities of organic carbon (C) that may be vulnerable to degradation as a result of a warming climate. Despite their limited coverage on the landscape, streams play a significant role in the processing, gaseous emission, and downstream export of C, and small streams are thought to be particularly important because of their close connection with the surrounding
Authors
John T. Crawford, Robert G. Striegl, Kimberly P. Wickland, Mark M. Dornblaser, Emily H. Stanley
Chromophoric dissolved organic matter export from U.S. rivers
Chromophoric dissolved organic matter (CDOM) fluxes and yields from 15 major U.S. rivers draining an assortment of terrestrial biomes are presented. A robust relationship between CDOM and dissolved organic carbon (DOC) loads is established (e.g., a350 versus DOC; r2 = 0.96, p < 0.001). Calculated CDOM yields are also correlated to watershed percent wetland (e.g. a350; r2 = 0.81, p < 0.001) providi
Authors
Robert G. M. Spencer, George R. Aiken, Mark M. Dornblaser, Kenna D. Butler, R. Max Holmes, Greg Fiske, Paul J. Mann, Aron Stubbins
Biodegradability of dissolved organic carbon in the Yukon River and its tributaries: Seasonality and importance of inorganic nitrogen
Northern high-latitude rivers transport large amounts of terrestrially derived dissolved organic matter (DOM) from boreal and arctic ecosystems to coastal areas and oceans. Current knowledge of the biodegradability of DOM in these rivers is limited, particularly for large rivers discharging to the Arctic Ocean. We conducted a seasonally comprehensive study of biodegradable dissolved organic carbon
Authors
Kimberly P. Wickland, George R. Aiken, Kenna D. Butler, Mark M. Dornblaser, RGM Spencer, Robert G. Striegl
Carbon dioxide and methane emissions from the Yukon River system
Carbon dioxide (CO2) and methane (CH4) emissions are important, but poorly quantified, components of riverine carbon (C) budgets. This is largely because the data needed for gas flux calculations are sparse and are spatially and temporally variable. Additionally, the importance of C gas emissions relative to lateral C exports is not well known because gaseous and aqueous fluxes are not commonly me
Authors
Robert G. Striegl, Mark M. Dornblaser, Cory P. McDonald, Jennifer R. Rover, Edward G. Stets
Science and Products
Filter Total Items: 35
Negligible cycling of terrestrial carbon in many lakes of the arid circumpolar landscape
High-latitude environments store nearly half of the planet’s below-ground organic carbon (OC), mostly in perennially frozen permafrost soils. Climatic changes drive increased export of terrestrial OC into many aquatic networks, yet the role that circumpolar lakes play in mineralizing this carbon is unclear. Here we directly evaluate ecosystem-scale OC cycling for lakes of interior Alaska. This ari
Authors
Matthew J. Bogard, Catherine D. Kuhn, Sarah Ellen Johnston, Robert G. Striegl, Gordon W. Holtgrieve, Mark M. Dornblaser, Robert G. M. Spencer, Kimberly P. Wickland, David E. Butman
Limited nitrate retention capacity in the Upper Mississippi River
The Mississippi River and other large rivers have the potential to regulate nitrogen export from terrestrial landscapes, and thus mitigate eutrophication in downstream aquatic ecosystems. In large rivers, human-constructed impoundments and connected backwaters may facilitate nitrogen removal; however, the capacity of these features is poorly quantified and incompletely incorporated into model fram
Authors
Luke C. Loken, John T. Crawford, Mark M. Dornblaser, Robert G. Striegl, Jeffrey N. Houser, Peter A Turner, Emily H. Stanley
Methane in groundwater from a leaking gas well, Piceance Basin, Colorado, USA
Site-specific and regional analysis of time-series hydrologic and geochemical data collected from 15 monitoring wells in the Piceance Basin indicated that a leaking gas well contaminated shallow groundwater with thermogenic methane. The gas well was drilled in 1956 and plugged and abandoned in 1990. Chemical and isotopic data showed the thermogenic methane was not from mixing of gas-rich formation
Authors
Peter B. McMahon, Judith C. Thomas, John T. Crawford, Mark M. Dornblaser, Andrew G. Hunt
CO2 time series patterns in contrasting headwater streams of North America
We explored the underlying patterns of temporal stream CO2 partial pressure (pCO2) variability using highfrequency sensors in seven disparate headwater streams distributed across the northern hemisphere. We also compared this dataset of [40,000 pCO2 records with other published records from lotic systems. Individual stream sites exhibited relatively distinct pCO2 patterns over time with few consis
Authors
John T. Crawford, Emily H. Stanley, Mark M. Dornblaser, Robert G. Striegl
Basin scale controls on CO2 and CH4 emissions from the Upper Mississippi River
The Upper Mississippi River, engineered for river navigation in the 1930s, includes a series of low-head dams and navigation pools receiving elevated sediment and nutrient loads from the mostly agricultural basin. Using high-resolution, spatially resolved water quality sensor measurements along 1385 river kilometers, we show that primary productivity and organic matter accumulation affect river ca
Authors
John T. Crawford, Luke C. Loken, Emily H. Stanley, Edward G. Stets, Mark M. Dornblaser, Robert G. Striegl
Source limitation of carbon gas emissions in high-elevation mountain streams and lakes
Inland waters are an important component of the global carbon cycle through transport, storage, and direct emissions of CO2 and CH4 to the atmosphere. Despite predictions of high physical gas exchange rates due to turbulent flows and ubiquitous supersaturation of CO2—and perhaps also CH4—patterns of gas emissions are essentially undocumented for high mountain ecosystems. Much like other headwater
Authors
John T. Crawford, Mark M. Dornblaser, Emily H. Stanley, David W. Clow, Robert G. Striegl
Switching predominance of organic versus inorganic carbon exports from an intermediate-size subarctic watershed
Hydrologic exports of dissolved inorganic and organic carbon (DIC, DOC) reflect permafrost conditions in arctic and subarctic river basins. DIC yields in particular, increase with decreased permafrost extent. We investigated the influence of permafrost extent on DIC and DOC yield in a tributary of the Yukon River, where the upper watershed has continuous permafrost and the lower watershed has disc
Authors
Mark M. Dornblaser, Robert G. Striegl
Using dissolved organic matter age and composition to detect permafrost thaw in boreal watersheds of interior Alaska
Recent warming at high latitudes has accelerated permafrost thaw, which can modify soil carbon dynamics and watershed hydrology. The flux and composition of dissolved organic matter (DOM) from soils to rivers are sensitive to permafrost configuration and its impact on subsurface hydrology and groundwater discharge. Here, we evaluate the utility of DOM composition and age as a tool for detecting pe
Authors
Jonathan A. O'Donnell, George R. Aiken, Michelle Ann Walvoord, Peter A. Raymond, Kenna D. Butler, Mark M. Dornblaser, Katherine Heckman
Emissions of carbon dioxide and methane from a headwater stream network of interior Alaska
Boreal ecosystems store significant quantities of organic carbon (C) that may be vulnerable to degradation as a result of a warming climate. Despite their limited coverage on the landscape, streams play a significant role in the processing, gaseous emission, and downstream export of C, and small streams are thought to be particularly important because of their close connection with the surrounding
Authors
John T. Crawford, Robert G. Striegl, Kimberly P. Wickland, Mark M. Dornblaser, Emily H. Stanley
Chromophoric dissolved organic matter export from U.S. rivers
Chromophoric dissolved organic matter (CDOM) fluxes and yields from 15 major U.S. rivers draining an assortment of terrestrial biomes are presented. A robust relationship between CDOM and dissolved organic carbon (DOC) loads is established (e.g., a350 versus DOC; r2 = 0.96, p < 0.001). Calculated CDOM yields are also correlated to watershed percent wetland (e.g. a350; r2 = 0.81, p < 0.001) providi
Authors
Robert G. M. Spencer, George R. Aiken, Mark M. Dornblaser, Kenna D. Butler, R. Max Holmes, Greg Fiske, Paul J. Mann, Aron Stubbins
Biodegradability of dissolved organic carbon in the Yukon River and its tributaries: Seasonality and importance of inorganic nitrogen
Northern high-latitude rivers transport large amounts of terrestrially derived dissolved organic matter (DOM) from boreal and arctic ecosystems to coastal areas and oceans. Current knowledge of the biodegradability of DOM in these rivers is limited, particularly for large rivers discharging to the Arctic Ocean. We conducted a seasonally comprehensive study of biodegradable dissolved organic carbon
Authors
Kimberly P. Wickland, George R. Aiken, Kenna D. Butler, Mark M. Dornblaser, RGM Spencer, Robert G. Striegl
Carbon dioxide and methane emissions from the Yukon River system
Carbon dioxide (CO2) and methane (CH4) emissions are important, but poorly quantified, components of riverine carbon (C) budgets. This is largely because the data needed for gas flux calculations are sparse and are spatially and temporally variable. Additionally, the importance of C gas emissions relative to lateral C exports is not well known because gaseous and aqueous fluxes are not commonly me
Authors
Robert G. Striegl, Mark M. Dornblaser, Cory P. McDonald, Jennifer R. Rover, Edward G. Stets