Isabelle M. Cozzarelli, Ph.D.
Isabelle Cozzarelli is a Research Hydrologist (Scientist Emerita) with the USGS Geology, Energy & Minerals (GEM) Science Center in Reston, VA.
Dr. Isabelle Cozzarelli retired as a Senior Research Scientist and currently serves as a Scientist Emerita affiliated with the Geology, Energy & Minerals Science Center and the Reston Biogeochemical Processes in Groundwater Laboratory. Isabelle uses a combined field and laboratory experimental approach to investigate biogeochemical processes in shallow groundwater and surface water environments that affect water availability. She uses a multi-disciplinary and multi-scale approach to study processes in environments stressed by anthropogenic inputs of biodegradable carbon, such as crude oil, landfill leachate, and oil and gas wastes.
Professional Experience
2020-present: Research Hydrologist, USGS, Geology, Energy & Minerals Science Center, Reston, VA, USA
2017-2020: Research Hydrologist, USGS Water Mission Area Headquarters, Reston, VA, USA
1985-2017: Research Hydrologist, USGS National Research Program, USGS, Reston, Virginia, USA
1983-1985: Research Assistant, University of Virginia, Charlottesville, Virginia, USA
Education and Certifications
Ph.D. University of Virginia, Environmental Sciences-Geochemistry, 1993
M.S. University of Virginia, Environmental Sciences-Geochemistry, 1986
B.S. University of Rochester, Geomechanics, 1983
Affiliations and Memberships*
2016-present: Adjunct Faculty, Department of Geosciences, Virginia Tech
Honors and Awards
2024: Senior Scientist (ST), Federal Government
2023: Friend of Water-Rock Interaction & Applied Isotope Geochemistry Award, International Association of Geochemistry
2017: USGS Meritorious Service Award
2005: Elected GSA Fellow
2005: USGS Superior Service Award
Science and Products
Filter Total Items: 21
Filter Total Items: 34
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Filter Total Items: 117
Pore-water chemistry from the ICDP-USGS core hole in the Chesapeake Bay impact structure-Implications for paleohydrology, microbial habitat, and water resources Pore-water chemistry from the ICDP-USGS core hole in the Chesapeake Bay impact structure-Implications for paleohydrology, microbial habitat, and water resources
We investigated the groundwater system of the Chesapeake Bay impact structure by analyzing the pore-water chemistry in cores taken from a 1766-m-deep drill hole 10 km north of Cape Charles, Virginia. Pore water was extracted using high-speed centrifuges from over 100 cores sampled from a 1300 m section of the drill hole. The pore-water samples were analyzed for major cations and anions...
Authors
W. E. Sanford, M.A. Voytek, D.S. Powars, B.F. Jones, I.M. Cozzarelli, C.S. Cockell, R.P. Eganhouse
Pore-water chemistry from the ICDP-USGS coer hole in the Chesapeake Bay impact structure--Implications for paleohydrology, microbial habitat, and water resources Pore-water chemistry from the ICDP-USGS coer hole in the Chesapeake Bay impact structure--Implications for paleohydrology, microbial habitat, and water resources
We investigated the groundwater system of the Chesapeake Bay impact structure by analyzing the pore-water chemistry in cores taken from a 1766-m-deep drill hole 10 km north of Cape Charles, Virginia. Pore water was extracted using high-speed centrifuges from over 100 cores sampled from a 1300 m section of the drill hole. The pore-water samples were analyzed for major cations and anions...
Authors
Ward Sanford, Mary Voytek, David Powars, Blair Jones, Isabelle Cozzarelli, Robert P. Eganhouse, Charles Cockell
Processes affecting δ34S and δ18O values of dissolved sulfate in alluvium along the Canadian River, central Oklahoma, USA Processes affecting δ34S and δ18O values of dissolved sulfate in alluvium along the Canadian River, central Oklahoma, USA
The δ34S and δ18O values for dissolved sulfate in groundwater are commonly used in aquifer studies to identify sulfate reservoirs and describe biogeochemical processes. The utility of these data, however, often is compromised by mixing of sulfate sources within reservoirs and isotope fractionation during sulfur redox cycling. Our study shows that, after all potential sulfate sources are...
Authors
Michele L. Tuttle, George Breit, Isabelle Cozzarelli
Biodegradation in contaminated aquifers: Incorporating microbial/molecular methods Biodegradation in contaminated aquifers: Incorporating microbial/molecular methods
In order to evaluate natural attenuation in contaminated aquifers, there has been a recent recognition that a multidisciplinary approach, incorporating microbial and molecular methods, is required. Observed decreases in contaminant mass and identified footprints of biogeochemical reactions are often used as evidence of intrinsic bioremediation, but characterizing the structure and...
Authors
J. Weiss, Isabelle Cozzarelli
Results of the chemical and isotopic analyses of sediment and ground water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma, part 2 Results of the chemical and isotopic analyses of sediment and ground water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma, part 2
Analytical results on sediment and associated ground water from the Canadian River alluvium collected subsequent to those described in Breit and others (2005) are presented in this report. The data presented herein were collected primarily to evaluate the iron and sulfur species within the sediment at well sites IC 36, IC 54, and IC South located at the USGS Norman Landfill study site...
Authors
George Breit, Michele Tuttle, Isabelle Cozzarelli, Cyrus Berry, Scott Christenson, Jeanne Jaeschke
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Oklahoma-Texas Water Science Center, Reston Biogeochemical Processes in Groundwater Laboratory
Determination of dominant biogeochemical processes in a contaminated aquifer-wetland system using multivariate statistical analysis Determination of dominant biogeochemical processes in a contaminated aquifer-wetland system using multivariate statistical analysis
Determining the processes governing aqueous biogeochemistry in a wetland hydrologically linked to an underlying contaminated aquifer is challenging due to the complex exchange between the systems and their distinct responses to changes in precipitation, recharge, and biological activities. To evaluate temporal and spatial processes in the wetland-aquifer system, water samples were...
Authors
S. Baez-Cazull, J.T. McGuire, I.M. Cozzarelli, M.A. Voytek
Biogeochemistry of aquifer systems Biogeochemistry of aquifer systems
Many studies have examined the differences in bacterial numbers, composition, and activity between groundwater and sediment samples. The majority of the literature has suggested higher percentages of attached bacteria than of unattached bacteria in aquifer systems, including in pristine aquifers and in aquifers contaminated with petroleum, creosote, sewage, and landfill leachate. In...
Authors
Isabelle Cozzarelli, J.V. Weiss
Evaluation of sulfate reduction at experimentally induced mixing interfaces using small-scale push-pull tests in an aquifer-wetland system Evaluation of sulfate reduction at experimentally induced mixing interfaces using small-scale push-pull tests in an aquifer-wetland system
This paper presents small-scale push–pull tests designed to evaluate the kinetic controls on SO42- reduction in situ at mixing interfaces between a wetland and aquifer impacted by landfill leachate at the Norman Landfill research site, Norman, OK. Quantifying the rates of redox reactions initiated at interfaces is of great interest because interfaces have been shown to be zones of...
Authors
T.A. Kneeshaw, Jennifer T. McGuire, Erik Smith, Isabelle Cozzarelli
Centimeter-scale characterization of biogeochemical gradients at a wetland-aquifer interface using capillary electrophoresis Centimeter-scale characterization of biogeochemical gradients at a wetland-aquifer interface using capillary electrophoresis
Steep biogeochemical gradients were measured at mixing interfaces in a wetland-aquifer system impacted by landfill leachate in Norman, Oklahoma. The system lies within a reworked alluvial plain and is characterized by layered low hydraulic conductivity wetland sediments interbedded with sandy aquifer material. Using cm-scale passive diffusion samplers, "peepers", water samples were...
Authors
S. Baez-Cazull, J.T. McGuire, Isabelle Cozzarelli, A. Raymond, L. Welsh
Recharge processes drive sulfate reduction in an alluvial aquifer contaminated with landfill leachate Recharge processes drive sulfate reduction in an alluvial aquifer contaminated with landfill leachate
Natural attenuation of contaminants in groundwater depends on an adequate supply of electron acceptors to stimulate biodegradation. In an alluvial aquifer contaminated with leachate from an unlined municipal landfill, the mechanism of recharge infiltration was investigated as a source of electron acceptors. Water samples were collected monthly at closely spaced intervals in the top 2 m...
Authors
M. Scholl, I.M. Cozzarelli, S. Christenson
Recharge processes in an alluvial aquifer riparian zone, Norman Landfill, Norman, Oklahoma, 1998-2000 Recharge processes in an alluvial aquifer riparian zone, Norman Landfill, Norman, Oklahoma, 1998-2000
Analyses of stable isotope profiles (d2H and d18O) in the saturated zone, combined with water-table fluctuations, gave a comprehensive picture of recharge processes in an alluvial aquifer riparian zone. At the Norman Landfill U.S. Geological Survey Toxic Substances Hydrology research site in Norman, Oklahoma, recharge to the aquifer appears to drive biodegradation, contributing fresh...
Authors
Martha Scholl, Scott Christenson, Isabelle Cozzarelli, Dale Ferree, Jeanne Jaeshke
Results of chemical and isotopic analyses of sediment and water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma Results of chemical and isotopic analyses of sediment and water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma
Results of physical and chemical analyses of sediment and water collected near a closed municipal landfill at Norman, Oklahoma are presented in this report. Sediment analyses are from 40 samples obtained by freeze-shoe coring at 5 sites, and 14 shallow (depth
Authors
George Breit, Michele Tuttle, Isabelle Cozzarelli, Scott Christenson, Jeanne Jaeschke, David Fey, Cyrus Berry
Filter Total Items: 13
Science and Products
Filter Total Items: 21
Filter Total Items: 34
No Result Found
Filter Total Items: 117
Pore-water chemistry from the ICDP-USGS core hole in the Chesapeake Bay impact structure-Implications for paleohydrology, microbial habitat, and water resources Pore-water chemistry from the ICDP-USGS core hole in the Chesapeake Bay impact structure-Implications for paleohydrology, microbial habitat, and water resources
We investigated the groundwater system of the Chesapeake Bay impact structure by analyzing the pore-water chemistry in cores taken from a 1766-m-deep drill hole 10 km north of Cape Charles, Virginia. Pore water was extracted using high-speed centrifuges from over 100 cores sampled from a 1300 m section of the drill hole. The pore-water samples were analyzed for major cations and anions...
Authors
W. E. Sanford, M.A. Voytek, D.S. Powars, B.F. Jones, I.M. Cozzarelli, C.S. Cockell, R.P. Eganhouse
Pore-water chemistry from the ICDP-USGS coer hole in the Chesapeake Bay impact structure--Implications for paleohydrology, microbial habitat, and water resources Pore-water chemistry from the ICDP-USGS coer hole in the Chesapeake Bay impact structure--Implications for paleohydrology, microbial habitat, and water resources
We investigated the groundwater system of the Chesapeake Bay impact structure by analyzing the pore-water chemistry in cores taken from a 1766-m-deep drill hole 10 km north of Cape Charles, Virginia. Pore water was extracted using high-speed centrifuges from over 100 cores sampled from a 1300 m section of the drill hole. The pore-water samples were analyzed for major cations and anions...
Authors
Ward Sanford, Mary Voytek, David Powars, Blair Jones, Isabelle Cozzarelli, Robert P. Eganhouse, Charles Cockell
Processes affecting δ34S and δ18O values of dissolved sulfate in alluvium along the Canadian River, central Oklahoma, USA Processes affecting δ34S and δ18O values of dissolved sulfate in alluvium along the Canadian River, central Oklahoma, USA
The δ34S and δ18O values for dissolved sulfate in groundwater are commonly used in aquifer studies to identify sulfate reservoirs and describe biogeochemical processes. The utility of these data, however, often is compromised by mixing of sulfate sources within reservoirs and isotope fractionation during sulfur redox cycling. Our study shows that, after all potential sulfate sources are...
Authors
Michele L. Tuttle, George Breit, Isabelle Cozzarelli
Biodegradation in contaminated aquifers: Incorporating microbial/molecular methods Biodegradation in contaminated aquifers: Incorporating microbial/molecular methods
In order to evaluate natural attenuation in contaminated aquifers, there has been a recent recognition that a multidisciplinary approach, incorporating microbial and molecular methods, is required. Observed decreases in contaminant mass and identified footprints of biogeochemical reactions are often used as evidence of intrinsic bioremediation, but characterizing the structure and...
Authors
J. Weiss, Isabelle Cozzarelli
Results of the chemical and isotopic analyses of sediment and ground water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma, part 2 Results of the chemical and isotopic analyses of sediment and ground water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma, part 2
Analytical results on sediment and associated ground water from the Canadian River alluvium collected subsequent to those described in Breit and others (2005) are presented in this report. The data presented herein were collected primarily to evaluate the iron and sulfur species within the sediment at well sites IC 36, IC 54, and IC South located at the USGS Norman Landfill study site...
Authors
George Breit, Michele Tuttle, Isabelle Cozzarelli, Cyrus Berry, Scott Christenson, Jeanne Jaeschke
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Oklahoma-Texas Water Science Center, Reston Biogeochemical Processes in Groundwater Laboratory
Determination of dominant biogeochemical processes in a contaminated aquifer-wetland system using multivariate statistical analysis Determination of dominant biogeochemical processes in a contaminated aquifer-wetland system using multivariate statistical analysis
Determining the processes governing aqueous biogeochemistry in a wetland hydrologically linked to an underlying contaminated aquifer is challenging due to the complex exchange between the systems and their distinct responses to changes in precipitation, recharge, and biological activities. To evaluate temporal and spatial processes in the wetland-aquifer system, water samples were...
Authors
S. Baez-Cazull, J.T. McGuire, I.M. Cozzarelli, M.A. Voytek
Biogeochemistry of aquifer systems Biogeochemistry of aquifer systems
Many studies have examined the differences in bacterial numbers, composition, and activity between groundwater and sediment samples. The majority of the literature has suggested higher percentages of attached bacteria than of unattached bacteria in aquifer systems, including in pristine aquifers and in aquifers contaminated with petroleum, creosote, sewage, and landfill leachate. In...
Authors
Isabelle Cozzarelli, J.V. Weiss
Evaluation of sulfate reduction at experimentally induced mixing interfaces using small-scale push-pull tests in an aquifer-wetland system Evaluation of sulfate reduction at experimentally induced mixing interfaces using small-scale push-pull tests in an aquifer-wetland system
This paper presents small-scale push–pull tests designed to evaluate the kinetic controls on SO42- reduction in situ at mixing interfaces between a wetland and aquifer impacted by landfill leachate at the Norman Landfill research site, Norman, OK. Quantifying the rates of redox reactions initiated at interfaces is of great interest because interfaces have been shown to be zones of...
Authors
T.A. Kneeshaw, Jennifer T. McGuire, Erik Smith, Isabelle Cozzarelli
Centimeter-scale characterization of biogeochemical gradients at a wetland-aquifer interface using capillary electrophoresis Centimeter-scale characterization of biogeochemical gradients at a wetland-aquifer interface using capillary electrophoresis
Steep biogeochemical gradients were measured at mixing interfaces in a wetland-aquifer system impacted by landfill leachate in Norman, Oklahoma. The system lies within a reworked alluvial plain and is characterized by layered low hydraulic conductivity wetland sediments interbedded with sandy aquifer material. Using cm-scale passive diffusion samplers, "peepers", water samples were...
Authors
S. Baez-Cazull, J.T. McGuire, Isabelle Cozzarelli, A. Raymond, L. Welsh
Recharge processes drive sulfate reduction in an alluvial aquifer contaminated with landfill leachate Recharge processes drive sulfate reduction in an alluvial aquifer contaminated with landfill leachate
Natural attenuation of contaminants in groundwater depends on an adequate supply of electron acceptors to stimulate biodegradation. In an alluvial aquifer contaminated with leachate from an unlined municipal landfill, the mechanism of recharge infiltration was investigated as a source of electron acceptors. Water samples were collected monthly at closely spaced intervals in the top 2 m...
Authors
M. Scholl, I.M. Cozzarelli, S. Christenson
Recharge processes in an alluvial aquifer riparian zone, Norman Landfill, Norman, Oklahoma, 1998-2000 Recharge processes in an alluvial aquifer riparian zone, Norman Landfill, Norman, Oklahoma, 1998-2000
Analyses of stable isotope profiles (d2H and d18O) in the saturated zone, combined with water-table fluctuations, gave a comprehensive picture of recharge processes in an alluvial aquifer riparian zone. At the Norman Landfill U.S. Geological Survey Toxic Substances Hydrology research site in Norman, Oklahoma, recharge to the aquifer appears to drive biodegradation, contributing fresh...
Authors
Martha Scholl, Scott Christenson, Isabelle Cozzarelli, Dale Ferree, Jeanne Jaeshke
Results of chemical and isotopic analyses of sediment and water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma Results of chemical and isotopic analyses of sediment and water from alluvium of the Canadian River near a closed municipal landfill, Norman, Oklahoma
Results of physical and chemical analyses of sediment and water collected near a closed municipal landfill at Norman, Oklahoma are presented in this report. Sediment analyses are from 40 samples obtained by freeze-shoe coring at 5 sites, and 14 shallow (depth
Authors
George Breit, Michele Tuttle, Isabelle Cozzarelli, Scott Christenson, Jeanne Jaeschke, David Fey, Cyrus Berry
Filter Total Items: 13
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government