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Dulcinea Avouris, PhD (Former Employee)

Science and Products

Image Collage of Landsat, pollinator, and volcanologist

Assessing impacts of wildfire on water and habitat quality in downstream aquatic ecosystems using remote sensing

This project focuses on the downstream effects of wildfires on lakes, reservoirs, and coastal water within the larger context of the USGS project on Post-fire Hazards and Impacts to Resources and Ecosystems (PHIRE): Support for Response, Recovery, and Mitigation. The overall objective of this work is to leverage the historic satellite remote sensing record to provide insight on the impact of...
By
Ecosystems Mission Area, California Water Science Center
Assessing impacts of wildfire on water and habitat quality in downstream aquatic ecosystems using remote sensing

Assessing impacts of wildfire on water and habitat quality in downstream aquatic ecosystems using remote sensing

This project focuses on the downstream effects of wildfires on lakes, reservoirs, and coastal water within the larger context of the USGS project on Post-fire Hazards and Impacts to Resources and Ecosystems (PHIRE): Support for Response, Recovery, and Mitigation. The overall objective of this work is to leverage the historic satellite remote sensing record to provide insight on the impact of...
Learn More

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

Broad-area, high-resolution, boat-based water quality mapping surveys of the Sacramento-San Joaquin Delta (Delta) were conducted in June and September of 2024. Each survey was comprised of one day of high-resolution mapping. The regions covered included Discovery Bay and Old and Middle Rivers in the South Delta Tidal Transition Zone. On each day, the route of the mapping survey was...
By
California Water Science Center

Sentinel-2 ACOLITE-DSF Aquatic Reflectance for the Conterminous United States Sentinel-2 ACOLITE-DSF Aquatic Reflectance for the Conterminous United States

This dynamic data release presents an aquatic reflectance product with 20-meter spatial resolution derived from Sentinel-2 satellite imagery for the conterminous United States using the Atmospheric Correction for OLI “lite” (ACOLITE). Aquatic reflectance, noted Rhow in ACOLITE documentation, is defined here as unitless water-leaving radiance reflectance and represents the ratio of water...
By
Water Resources Mission Area

Above-water hyperspectral field spectroscopy measurements at Franks Tract in the Sacramento-San Joaquin Delta, California Above-water hyperspectral field spectroscopy measurements at Franks Tract in the Sacramento-San Joaquin Delta, California

Hand-held hyperspectral spectroscopy data were collected in 2022 in Franks Tract, a flooded area located in the central Sacramento-San Joaquin Delta of California. The data were collected from a boat and co-located within pixels from the Ocean Land Color Imaging (OLCI) sensor on the Sentinel-3A and 3-B satellites. Data from 16 sites within 7 OLCI pixels were collected on three days: July...
By
California Water Science Center

High resolution and discrete temporal and spatial water-quality measurements in support of modeling mercury and methylmercury concentrations in surface waters of the Sacramento-San Joaquin River Delta High resolution and discrete temporal and spatial water-quality measurements in support of modeling mercury and methylmercury concentrations in surface waters of the Sacramento-San Joaquin River Delta

The Sacramento / San Joaquin River Delta (SSJRD) is contaminated with legacy mercury (Hg) from historical mining and mineral processing activities throughout the watershed, as well as from contemporary atmospheric and industrial inputs. The current project was designed for the purpose of developing high-resolution spatial and temporal models for estimating concentrations of mercury...
By
Water Resources Mission Area

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

Cyanobacterial harmful algal blooms (CHABs) are a growing concern in freshwater environments. These blooms can lead to degraded water quality, ecosystem disruptions, and public health threats due to the production of potent cyanotoxins. The Sacramento–San Joaquin Delta (California, USA; the Delta) has experienced CHABs since 1999, including CHABs that produce cyanotoxins at...
Authors
Keith Bouma-Gregson, Lisa Lucas, Andrea Cecile Jaegge, Dulcinea Marie Avouris, Emily T. Richardson, Jacob Aaron Zwart, Tamara E. C. Kraus
By
California Water Science Center

An integrated sensor network and data driven approach to satellite remote sensing of dissolved organic matter An integrated sensor network and data driven approach to satellite remote sensing of dissolved organic matter

Traditional remote sensing retrieval models for water quality have historically relied on limited, localized data sets due to the prohibitive costs of extensive field campaigns and logistical challenges of collecting match-up data with satellite overpasses. As a result, these models often lack generalizability across seasons, tides, and sites. Furthermore, small field data sets limit the...
Authors
Dulcinea Marie Avouris, Erin L Hestir, Jacob Fleck, Jeffrey A. Hansen, Brian A. Bergamaschi
By
California Water Science Center

Unlocking ecological insights from sub-seasonal visible-to-shortwave infrared imaging spectroscopy: The SHIFT campaign Unlocking ecological insights from sub-seasonal visible-to-shortwave infrared imaging spectroscopy: The SHIFT campaign

We stand at the threshold of a transformative era in Earth observation, marked by space-borne visible-to-shortwave infrared (VSWIR) imaging spectrometers that promise consistent global observations of ecosystem function, phenology, and inter- and intra-annual change. However, the full value of repeat spectroscopy, the information embedded within different temporal scales, and the...
Authors
K. Dana Chadwick, Frank W. Davis, Kimberley Miner, Ryan Pavlick, Mark Reynolds, Philip A. Townsend, Philip Brodrick, Christiana Ade, Jean Allen, Leander D. L. Anderegg, Yoseline Angel, Indra Boving, Kristin B. Byrd, Petya Campbell, Luke Carberry, Katherine Cavanaugh, Kyle C. Cavanaugh, Kelly Easterday, Regina Eckert, Michelle M. Gierach, Kaitlin Gold, Erin Hestir, Fred Huemmrich, Maggie Klope, Raymond F. Kokaly, Piper Lovegreen, Kelly Luis, Conor McMahon, Nicholas Nidzieko, Francisco Ochoa, Anna Ongjoco, Elsa Ordway, Madeleine Pascolini-Campbell, Natalie Queally, Dar A. Roberts, Clare Saiki, Fabian D Schneider, Alexey N. Shiklomanov, German Silva, Jordan Snyder, Michele Thornton, Anna Trugman, Nidhi Vinod, Ting Zheng, Dulcinea M. Avouris, Brianna Baker, Latha Baskaran, Tom Bell, Megan Berg, Michael Bernas, Niklas Bohn, Renato Braghiere, Zach Breuer, Andrew J. Brooks, Nolan Burkard, Julia Burmistrova, Kerry-Anne Cawse-Nicholson, John Chapman, Johana Chazaro-Haraksin, Joel Cryer, K.C. Cushman, Kyla M. Dahlin, Phuong Dao, Athena DiBartolo, Michael Eastwood, Clayton D. Elder, Angela Giordani, Kathleen Grant, Robert O. Green, Alexa Hanson, Brendan Heberlein, Mark Helmlinger, Simon Hook, Daniel J. Jensen, Emma Johnson, Marie Johnson, Michael Kiper, Christopher Kibler, Jennifer Y. King, Kyle Kovach, Aaron Kreisberg, Daniel Lacey, Evan Lang, Christine M. Lee, Amanda M Lopez, Brittany Lopez Barreto, Andrew Maguire, Elliott Marsh, Charles E. Miller, Dieu My Nguyen, Cassandra Nickles, Jonathan Ocón, Elijah Papen, Maria Park, Benjamin Poulter, Ann M. Raiho, Porter Reim, Timothy J. Robinson, Fernando Romero Galvan, Ethan Shafron, Brenen R. Skalitzky, Sydney Stroschein, Nicole Chin Taylor, David R. Thompson, Kate Thompson, Cecily Tye, Joelie Van Beek, Cecilia Vanden Heuvel, Jonathan Vellanoweth, Evert Vermeer, Claire Villanueva-Weeks, Kristen Zumdahl, David Schimel
By
Geology, Geophysics, and Geochemistry Science Center, Western Geographic Science Center, Spectroscopy Lab

Science and Products

Image Collage of Landsat, pollinator, and volcanologist

Assessing impacts of wildfire on water and habitat quality in downstream aquatic ecosystems using remote sensing

This project focuses on the downstream effects of wildfires on lakes, reservoirs, and coastal water within the larger context of the USGS project on Post-fire Hazards and Impacts to Resources and Ecosystems (PHIRE): Support for Response, Recovery, and Mitigation. The overall objective of this work is to leverage the historic satellite remote sensing record to provide insight on the impact of...
By
Ecosystems Mission Area, California Water Science Center
Assessing impacts of wildfire on water and habitat quality in downstream aquatic ecosystems using remote sensing

Assessing impacts of wildfire on water and habitat quality in downstream aquatic ecosystems using remote sensing

This project focuses on the downstream effects of wildfires on lakes, reservoirs, and coastal water within the larger context of the USGS project on Post-fire Hazards and Impacts to Resources and Ecosystems (PHIRE): Support for Response, Recovery, and Mitigation. The overall objective of this work is to leverage the historic satellite remote sensing record to provide insight on the impact of...
Learn More

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

Broad-area, high-resolution, boat-based water quality mapping surveys of the Sacramento-San Joaquin Delta (Delta) were conducted in June and September of 2024. Each survey was comprised of one day of high-resolution mapping. The regions covered included Discovery Bay and Old and Middle Rivers in the South Delta Tidal Transition Zone. On each day, the route of the mapping survey was...
By
California Water Science Center

Sentinel-2 ACOLITE-DSF Aquatic Reflectance for the Conterminous United States Sentinel-2 ACOLITE-DSF Aquatic Reflectance for the Conterminous United States

This dynamic data release presents an aquatic reflectance product with 20-meter spatial resolution derived from Sentinel-2 satellite imagery for the conterminous United States using the Atmospheric Correction for OLI “lite” (ACOLITE). Aquatic reflectance, noted Rhow in ACOLITE documentation, is defined here as unitless water-leaving radiance reflectance and represents the ratio of water...
By
Water Resources Mission Area

Above-water hyperspectral field spectroscopy measurements at Franks Tract in the Sacramento-San Joaquin Delta, California Above-water hyperspectral field spectroscopy measurements at Franks Tract in the Sacramento-San Joaquin Delta, California

Hand-held hyperspectral spectroscopy data were collected in 2022 in Franks Tract, a flooded area located in the central Sacramento-San Joaquin Delta of California. The data were collected from a boat and co-located within pixels from the Ocean Land Color Imaging (OLCI) sensor on the Sentinel-3A and 3-B satellites. Data from 16 sites within 7 OLCI pixels were collected on three days: July...
By
California Water Science Center

High resolution and discrete temporal and spatial water-quality measurements in support of modeling mercury and methylmercury concentrations in surface waters of the Sacramento-San Joaquin River Delta High resolution and discrete temporal and spatial water-quality measurements in support of modeling mercury and methylmercury concentrations in surface waters of the Sacramento-San Joaquin River Delta

The Sacramento / San Joaquin River Delta (SSJRD) is contaminated with legacy mercury (Hg) from historical mining and mineral processing activities throughout the watershed, as well as from contemporary atmospheric and industrial inputs. The current project was designed for the purpose of developing high-resolution spatial and temporal models for estimating concentrations of mercury...
By
Water Resources Mission Area

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

Cyanobacterial harmful algal blooms (CHABs) are a growing concern in freshwater environments. These blooms can lead to degraded water quality, ecosystem disruptions, and public health threats due to the production of potent cyanotoxins. The Sacramento–San Joaquin Delta (California, USA; the Delta) has experienced CHABs since 1999, including CHABs that produce cyanotoxins at...
Authors
Keith Bouma-Gregson, Lisa Lucas, Andrea Cecile Jaegge, Dulcinea Marie Avouris, Emily T. Richardson, Jacob Aaron Zwart, Tamara E. C. Kraus
By
California Water Science Center

An integrated sensor network and data driven approach to satellite remote sensing of dissolved organic matter An integrated sensor network and data driven approach to satellite remote sensing of dissolved organic matter

Traditional remote sensing retrieval models for water quality have historically relied on limited, localized data sets due to the prohibitive costs of extensive field campaigns and logistical challenges of collecting match-up data with satellite overpasses. As a result, these models often lack generalizability across seasons, tides, and sites. Furthermore, small field data sets limit the...
Authors
Dulcinea Marie Avouris, Erin L Hestir, Jacob Fleck, Jeffrey A. Hansen, Brian A. Bergamaschi
By
California Water Science Center

Unlocking ecological insights from sub-seasonal visible-to-shortwave infrared imaging spectroscopy: The SHIFT campaign Unlocking ecological insights from sub-seasonal visible-to-shortwave infrared imaging spectroscopy: The SHIFT campaign

We stand at the threshold of a transformative era in Earth observation, marked by space-borne visible-to-shortwave infrared (VSWIR) imaging spectrometers that promise consistent global observations of ecosystem function, phenology, and inter- and intra-annual change. However, the full value of repeat spectroscopy, the information embedded within different temporal scales, and the...
Authors
K. Dana Chadwick, Frank W. Davis, Kimberley Miner, Ryan Pavlick, Mark Reynolds, Philip A. Townsend, Philip Brodrick, Christiana Ade, Jean Allen, Leander D. L. Anderegg, Yoseline Angel, Indra Boving, Kristin B. Byrd, Petya Campbell, Luke Carberry, Katherine Cavanaugh, Kyle C. Cavanaugh, Kelly Easterday, Regina Eckert, Michelle M. Gierach, Kaitlin Gold, Erin Hestir, Fred Huemmrich, Maggie Klope, Raymond F. Kokaly, Piper Lovegreen, Kelly Luis, Conor McMahon, Nicholas Nidzieko, Francisco Ochoa, Anna Ongjoco, Elsa Ordway, Madeleine Pascolini-Campbell, Natalie Queally, Dar A. Roberts, Clare Saiki, Fabian D Schneider, Alexey N. Shiklomanov, German Silva, Jordan Snyder, Michele Thornton, Anna Trugman, Nidhi Vinod, Ting Zheng, Dulcinea M. Avouris, Brianna Baker, Latha Baskaran, Tom Bell, Megan Berg, Michael Bernas, Niklas Bohn, Renato Braghiere, Zach Breuer, Andrew J. Brooks, Nolan Burkard, Julia Burmistrova, Kerry-Anne Cawse-Nicholson, John Chapman, Johana Chazaro-Haraksin, Joel Cryer, K.C. Cushman, Kyla M. Dahlin, Phuong Dao, Athena DiBartolo, Michael Eastwood, Clayton D. Elder, Angela Giordani, Kathleen Grant, Robert O. Green, Alexa Hanson, Brendan Heberlein, Mark Helmlinger, Simon Hook, Daniel J. Jensen, Emma Johnson, Marie Johnson, Michael Kiper, Christopher Kibler, Jennifer Y. King, Kyle Kovach, Aaron Kreisberg, Daniel Lacey, Evan Lang, Christine M. Lee, Amanda M Lopez, Brittany Lopez Barreto, Andrew Maguire, Elliott Marsh, Charles E. Miller, Dieu My Nguyen, Cassandra Nickles, Jonathan Ocón, Elijah Papen, Maria Park, Benjamin Poulter, Ann M. Raiho, Porter Reim, Timothy J. Robinson, Fernando Romero Galvan, Ethan Shafron, Brenen R. Skalitzky, Sydney Stroschein, Nicole Chin Taylor, David R. Thompson, Kate Thompson, Cecily Tye, Joelie Van Beek, Cecilia Vanden Heuvel, Jonathan Vellanoweth, Evert Vermeer, Claire Villanueva-Weeks, Kristen Zumdahl, David Schimel
By
Geology, Geophysics, and Geochemistry Science Center, Western Geographic Science Center, Spectroscopy Lab
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