The West Sacramento Projects Office is the primary home the CAWSC Hydrodynamics and Ecology Program and also houses members of the Biogeochemistry group. These are pictures of the facility.
Tamara Kraus, PhD
Tamara Kraus is a Research Soil Scientist, and Acting Program Chief for Biogeochemistry, at the California Water Science Center.
Tamara Kraus received a master's degree in Agronomy and a doctoral degree in Soils and Biogeochemistry from the University of California, Davis. She has been working at the USGS California Water Science Center (CAWSC) in Sacramento since 2004, where she does research on the cycling of carbon and nutrients, and the linkages between terrestrial and aquatic systems. Her projects span a range of topics from identifying sources of dissolved organic carbon and to inform drinking water quality management, to using constructed wetlands to reverse subsidence, to the application of in situ coagulation to remove mercury from surface waters, to understanding the links between nutrients and phytoplankton.
Professional Experience
2010-present Soil Scientist, US Geological Survey, Sacramento, CA
2006-2009 Post Doctoral Researcher, US Geological Survey through UC Davis, Sacramento, CA
2004-2005 National Research Council Post Doctoral Fellow with US Geological Survey, Sacramento, CA
1996-2003 Research Assistant: Soil Chemistry Lab, , University of California, Davis, CA
1996-2003 Teaching Assistant: Soils and Biogeochemistry, , University of California, Davis, CA
1995-1996 Post-Graduate Researcher/Project Manager, University of California, Davis, CA
1992-1994 Research Assistant: Agronomy, University of California, Davis, CA
Education and Certifications
Ph.D., Soils and Biogeochemistry, 2002, University of California, Davis , CA Dissertation: Tannins and Nutrient Dynamics in Forest Soils: Plant-Litter-Soil Interactions
M.S., Agronomy and Range Science, 1994, University of California, Davis, CAThesis: Weed Abundance and Competition in Water-Seeded versus Drill-Seeded Rice in California
B.A., Biology and Society: Agriculture and the Environment, 1989, College of Arts and Sciences Cornell University, Ithaca, NY
Science and Products
Assessing environmental drivers and protist community dynamics that shaped the historic August 2022 Heterosigma akashiwo bloom in San Francisco Bay, California Assessing environmental drivers and protist community dynamics that shaped the historic August 2022 Heterosigma akashiwo bloom in San Francisco Bay, California
Designs for cyanobacterial harmful algal bloom monitoring in the Sacramento–San Joaquin Delta, California Designs for cyanobacterial harmful algal bloom monitoring in the Sacramento–San Joaquin Delta, California
Identifying conditions associated with outliers produced by three different chlorophyll fluorometers: A comparison of instrumentation and development of correction formulae Identifying conditions associated with outliers produced by three different chlorophyll fluorometers: A comparison of instrumentation and development of correction formulae
Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—Comparison of four (2018, 2020, 2021, 2022) spring high-resolution mapping surveys Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—Comparison of four (2018, 2020, 2021, 2022) spring high-resolution mapping surveys
Estimating biogeochemical rates using a computationally efficient Lagrangian approach Estimating biogeochemical rates using a computationally efficient Lagrangian approach
Land-use interactions, Oil-Field infrastructure, and natural processes control hydrocarbon and arsenic concentrations in groundwater, Poso Creek Oil Field, California, USA Land-use interactions, Oil-Field infrastructure, and natural processes control hydrocarbon and arsenic concentrations in groundwater, Poso Creek Oil Field, California, USA
In situ chlorophyll fluorometer validation and comparison study
High-frequency Monitoring of Delta Island Drainage Waters
Biogeochemistry Group
Sampling Locations for the Water Quality of San Francisco Bay Project
Sampling Methods for the Water Quality of San Francisco Bay Project
Assessing Sediment Nutrient Storage and Release in California's Sacramento-San Joaquin Delta
Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025) Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025)
Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025 Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025
Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples
Water quality and nutrient data from San Joaquin River and Stockton Waterfront, April and August 2024 Water quality and nutrient data from San Joaquin River and Stockton Waterfront, April and August 2024
Assessing spatial variability of nutrients, phytoplankton, and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2023 High resolution mapping surveys Assessing spatial variability of nutrients, phytoplankton, and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2023 High resolution mapping surveys
Cyanotoxins in the California Sacramento-San Joaquin Delta: Fixed Station Solid Phase Adsorption Toxin Tracking (SPATT) samplers Cyanotoxins in the California Sacramento-San Joaquin Delta: Fixed Station Solid Phase Adsorption Toxin Tracking (SPATT) samplers
The West Sacramento Projects Office is the primary home the CAWSC Hydrodynamics and Ecology Program and also houses members of the Biogeochemistry group. These are pictures of the facility.
Bay- Delta Water Quality, Nutrient and Phytoplankton Mapping | US Geological Survey Bay- Delta Water Quality, Nutrient and Phytoplankton Mapping | US Geological Survey
Science and Products
Assessing environmental drivers and protist community dynamics that shaped the historic August 2022 Heterosigma akashiwo bloom in San Francisco Bay, California Assessing environmental drivers and protist community dynamics that shaped the historic August 2022 Heterosigma akashiwo bloom in San Francisco Bay, California
Designs for cyanobacterial harmful algal bloom monitoring in the Sacramento–San Joaquin Delta, California Designs for cyanobacterial harmful algal bloom monitoring in the Sacramento–San Joaquin Delta, California
Identifying conditions associated with outliers produced by three different chlorophyll fluorometers: A comparison of instrumentation and development of correction formulae Identifying conditions associated with outliers produced by three different chlorophyll fluorometers: A comparison of instrumentation and development of correction formulae
Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—Comparison of four (2018, 2020, 2021, 2022) spring high-resolution mapping surveys Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—Comparison of four (2018, 2020, 2021, 2022) spring high-resolution mapping surveys
Estimating biogeochemical rates using a computationally efficient Lagrangian approach Estimating biogeochemical rates using a computationally efficient Lagrangian approach
Land-use interactions, Oil-Field infrastructure, and natural processes control hydrocarbon and arsenic concentrations in groundwater, Poso Creek Oil Field, California, USA Land-use interactions, Oil-Field infrastructure, and natural processes control hydrocarbon and arsenic concentrations in groundwater, Poso Creek Oil Field, California, USA
In situ chlorophyll fluorometer validation and comparison study
High-frequency Monitoring of Delta Island Drainage Waters
Biogeochemistry Group
Sampling Locations for the Water Quality of San Francisco Bay Project
Sampling Methods for the Water Quality of San Francisco Bay Project
Assessing Sediment Nutrient Storage and Release in California's Sacramento-San Joaquin Delta
Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025) Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025)
Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025 Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025
Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples
Water quality and nutrient data from San Joaquin River and Stockton Waterfront, April and August 2024 Water quality and nutrient data from San Joaquin River and Stockton Waterfront, April and August 2024
Assessing spatial variability of nutrients, phytoplankton, and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2023 High resolution mapping surveys Assessing spatial variability of nutrients, phytoplankton, and related water quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2023 High resolution mapping surveys
Cyanotoxins in the California Sacramento-San Joaquin Delta: Fixed Station Solid Phase Adsorption Toxin Tracking (SPATT) samplers Cyanotoxins in the California Sacramento-San Joaquin Delta: Fixed Station Solid Phase Adsorption Toxin Tracking (SPATT) samplers
The West Sacramento Projects Office is the primary home the CAWSC Hydrodynamics and Ecology Program and also houses members of the Biogeochemistry group. These are pictures of the facility.
The West Sacramento Projects Office is the primary home the CAWSC Hydrodynamics and Ecology Program and also houses members of the Biogeochemistry group. These are pictures of the facility.