Rob Striegl
Rob Striegl is an Emeritus Research Hydrologist with the USGS Water Resources Mission Area.
Professional Studies/Experience
I am a Research Aquatic Biogeochemist / Hydrologist located in Boulder, Colorado. My research focuses on the role of inland waters in the global carbon cycle and on hydrologic, climatic, and disturbance controls on the biogeochemical cycling, sequestration, transport, and surface-atmosphere exchange of aquatic carbon. Investigations conducted by me and my research group address a broad range of field, laboratory and modeling studies, including the transport of inorganic and organic carbon by surface and subsurface waters; the production, consumption, and atmospheric exchange of carbon dioxide and methane by streams, rivers, lakes, reservoirs, and soils; the effects of climate warming, permafrost thaw, and other disturbances on the carbon cycle of subarctic and boreal regions; and extrapolation of inland waters carbon biogeochemical processes and rates of carbon exchange from site to regional, continental, and global scales. I lead USGS LandCarbon investigations of Ecosystem Carbon Sequestration and Greenhouse Gas Exchange by Inland Waters of the USA and am also the Principal Investigator of the NASA Arctic-Boreal Vulnerability Experiment (ABoVE) project "Aquatic Vulnerabilites of Inland Waters and the Aquatic Carbon Cycle to Changing Permafrost and Climate across Boreal North America".
Professional societies/affiliations/committees/editorial boards
- Carbon Cycle Scientific Steering Group,
- U.S. Carbon Cycle Science Program,
- U.S. Global Change Research Program
- Associate Editor, Journal of Geophysical Research - Biogeosciences, American Geophysical Union
Education and Certifications
Education
PhD: University of Wisconsin - Madison; Oceanography and Limnology
MSc: Univeristy of Illinois - Urbana; Biology / Aquatic Ecology
BSc: Western Illinois Univeristy - Macomb; Zoology
Science and Products
Soil respiration at the Amargosa Desert Research site: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Estimating lake-atmosphere CO2 exchange
Methane flux in subalpine wetland and unsaturated soils in the southern Rocky Mountains
Tritium in water vapor in the shallow unsaturated zone at the Amargosa Desert Research Site
Isotopic composition of water in a deep unsaturated zone beside a radioactive-waste disposal area near Beatty, Nevada
Tritium and 14C concentrations in unsaturated-zone gases at test hole UZB-2, Amargosa Desert Research Site, 1994-98: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina,
Tritium in unsaturated zone gases and air at the Amargosa Desert Research Site, and in spring and river water, near Beatty, Nevada, May 1997
Effects of a clear-cut harvest on soil respiration in a jack pine - Lichen woodland
Hydrologic influence on methane and carbon dioxide dynamics at two north-central Minnesota lakes
Winter fluxes of CO2 and CH4 from subalpine soils in Rocky Mountain National Park, Colorado
Comparing nocturnal eddy covariance measurements to estimates of ecosystem respiration made by scaling chamber measurements at six coniferous boreal sites
Measurements of soil carbon dioxide and methane concentrations and fluxes, and soil properties at Four Ages of Jack Pine Forest in the Southern Study Area of the Boreal Ecosystem Atmosphere Study, Saskatchewan, Canada, 1993-95
Science and Products
- Science
- Data
- Multimedia
- Publications
Filter Total Items: 142
Soil respiration at the Amargosa Desert Research site: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Automated opaque flux-chamber measurements of soil carbon dioxide (CO2) flux (soil respiration) into the atmosphere at the Amargosa Desert Research Site show seasonal and diel cycles of soil respiration that are closely linked with soil temperature and soil moisture. During 1998, soil respiration increased with soil warming through spring, reaching a maximum rate (not counting anomalously high valAuthorsAlan C. Riggs, Robert G. Striegl, Florentino B. MaestasEstimating lake-atmosphere CO2 exchange
Lake‐atmosphere CO2 flux was directly measured above a small, woodland lake using the eddy covariance technique and compared with fluxes deduced from changes in measured lake‐water CO2 storage and with flux predictions from boundary‐layer and surface‐renewal models. Over a 3‐yr period, lake‐atmosphere exchanges of CO2 were measured over 5 weeks in spring, summer, and fall. Observed springtime CO2AuthorsD.E. Anderson, Robert G. Striegl, D.I. Stannard, C.M. Michmerhuizen, T.A. McConnaughey, J. W. LaBaughMethane flux in subalpine wetland and unsaturated soils in the southern Rocky Mountains
Methane exchange between the atmosphere and subalpine wetland and unsaturated soils was evaluated over a 15-month period during 1995-1996. Four vegetation community types along a moisture gradient (wetland, moist-grassy, moist-mossy, and dry) were included in a 100 m sampling transect situated at 3200 m elevation in Rocky Mountain National Park, Colorado. Methane fluxes and soil temperature were mAuthorsK.P. Wickland, Robert G. Striegl, S.K. Schmidt, M.A. MastTritium in water vapor in the shallow unsaturated zone at the Amargosa Desert Research Site
Samples of water vapor in soil gas were obtained at the U.S. Geological Survey's Amargosa Desert Research Site in 1997 and 1998 from a depth of 1.5 m (meters) within a 300 m by 300 m grid that lies immediately to the south and west of a low-level radioactive-waste disposal site. The gas samples were analyzed for tritium. Fifty-eight samples were collected in May 1997; 61 samples were collected inAuthorsRichard W. Healy, Robert G. Striegl, Robert L. Michel, David E. Prudic, Brian J. AndraskiIsotopic composition of water in a deep unsaturated zone beside a radioactive-waste disposal area near Beatty, Nevada
The isotopic composition of water in deep unsaturated zones is of interest because it provides information relevant to hydrologic processes and contaminant migration. Profiles of oxygen-18 (18O), deuterium (D), and tritium (3H) from a 110-meter deep unsaturated zone, together with data on the isotopic composition of ground water and modern-day precipitation, are interpreted in the context of waterAuthorsDavid A. Stonestrom, David E. Prudic, Robert G. StrieglTritium and 14C concentrations in unsaturated-zone gases at test hole UZB-2, Amargosa Desert Research Site, 1994-98: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina,
Tritium concentrations have been determined yearly since April 1994 from water-vapor samples collected at test hole UZB-2. The hole was drilled about 100 m (meters) south of the southwest corner of a commercial burial site for low-level radioactive wastes in September 1993. UZB-2 is equipped with ten 2.5-cm (centimeters) diameter air ports permanently installed in the unsaturated zone between theAuthorsDavid E. Prudic, Robert G. Striegl, Richard W. Healy, Robert L. Michel, Herbert HaasTritium in unsaturated zone gases and air at the Amargosa Desert Research Site, and in spring and river water, near Beatty, Nevada, May 1997
Elevated tritium concentrations in the unsaturated zone at the Amargosa Desert Research Site (ADRS), immediately south and west of the low-level radioactive-waste burial site south of Beatty, Nevada, have stimulated research of processes that control the transport of tritium in arid unsaturated zones. In May 1997, 58 samples were collected from 1.5 m (meters) depth within a 250 m by 250 m grid atAuthorsRobert G. Striegl, Richard W. Healy, Robert L. Michel, David E. PrudicEffects of a clear-cut harvest on soil respiration in a jack pine - Lichen woodland
Quantification of the components of ecosystem respiration is essential to understanding carbon (C) cycling of natural and disturbed landscapes. Soil respiration, which includes autotrophic and heterotrophic respiration from throughout the soil profile, is the second largest flux in the global carbon cycle. We measured soil respiration (soil CO2 emission) at an undisturbed mature jack pine (Pinus bAuthorsRobert G. Striegl, K.P. WicklandHydrologic influence on methane and carbon dioxide dynamics at two north-central Minnesota lakes
Annual emissions of (CH4 + CO2) to the atmosphere were proportional to net hydrologic inputs of C, mostly by groundwater, at two lakes in the Shingobee River watershed in north-central Minnesota. Williams Lake (WL), a closed basin lake near the top of the watershed, had a hydraulic residence time of 2-4 yr and groundwater exchange of about +2 mol dissolved inorganic carbon (DIC) and -0.1 mol dissoAuthorsRobert G. Striegl, C.M. MichmerhuizenWinter fluxes of CO2 and CH4 from subalpine soils in Rocky Mountain National Park, Colorado
Fluxes of CO2 and CH4 through a seasonal snowpack were measured in and adjacent to a subalpine wetland in Rocky Mountain National Park, Colorado. Gas diffusion through the snow was controlled by gas production or consumption in the soil and by physical snowpack properties. The snowpack insulated soils from cold midwinter air temperatures allowing microbial activity to continue through the winter.AuthorsAlisa Mast, Kimberly P. Wickland, Robert G. Striegl, David W. ClowComparing nocturnal eddy covariance measurements to estimates of ecosystem respiration made by scaling chamber measurements at six coniferous boreal sites
During the growing season, nighttime ecosystem respiration emits 30–100% of the daytime net photosynthetic uptake of carbon, and therefore measurements of rates and understanding of its control by the environment are important for understanding net ecosystem exchange. Ecosystem respiration can be measured at night by eddy covariance methods, but the data may not be reliable because of low turbulenAuthorsM.B. Lavigne, M. G. Ryan, D.E. Anderson, D. D. Baldocchi, P.M. Crill, D.R. Fitzjarrald, M. L. Goulden, S.T. Gower, J.M. Massheder, J.H. McCaughey, M. Rayment, Robert G. StrieglMeasurements of soil carbon dioxide and methane concentrations and fluxes, and soil properties at Four Ages of Jack Pine Forest in the Southern Study Area of the Boreal Ecosystem Atmosphere Study, Saskatchewan, Canada, 1993-95
No abstract available.AuthorsK.P. Wickland, Robert G. Striegl