Bryan Downing (Former Employee)
Science and Products
Filter Total Items: 14
Continuous underway water quality and water isotope measurements in a hydrodynamically complex tidal environment Continuous underway water quality and water isotope measurements in a hydrodynamically complex tidal environment
Real-time, high frequency (1-second sample interval) GPS location, water quality, and water isotope (δ2H, δ18O) data was collected in the Cache Slough Complex (CSC), located in the northern San Francisco Bay Delta (SFBD). Data was collected on 10/01/2014 for an approximate 4-hour period (10:30 14:30 h PST) while underway on the R/V Mary Landsteiner, a 26-foot USGS vessel. Sample water...
Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model
Regional models of tidal marsh elevation response to sea-level rise are needed to support coastal climate change adaptation decisions, including those related to land use planning, habitat management and infrastructure design. The Marsh Equilibrium Model (MEM) is a one-dimensional mechanistic elevation model that incorporates feedbacks of organic and inorganic inputs within the tidal...
Filter Total Items: 38
An introduction to high-frequency nutrient and biogeochemical monitoring for the Sacramento–San Joaquin Delta, northern California An introduction to high-frequency nutrient and biogeochemical monitoring for the Sacramento–San Joaquin Delta, northern California
Executive Summary This report is the first in a series of three reports that provide information about high-frequency (HF) nutrient and biogeochemical monitoring in the Sacramento–San Joaquin Delta of northern California (Delta). This first report provides an introduction to the reasons for and fundamental concepts behind collecting HF measurements, and describes the benefits associated...
Authors
Tamara E.C. Kraus, Brian A. Bergamaschi, Bryan D. Downing
Designing a high-frequency nutrient and biogeochemical monitoring network for the Sacramento–San Joaquin Delta, northern California Designing a high-frequency nutrient and biogeochemical monitoring network for the Sacramento–San Joaquin Delta, northern California
Executive Summary This report is the third in a series of three reports that provide information about how high-frequency (HF) nutrient monitoring may be used to assess nutrient inputs and dynamics in the Sacramento–San Joaquin Delta, California (Delta). The purpose of this report is to provide the background, principles, and considerations for designing an HF nutrient-monitoring network...
Authors
Brian A. Bergamaschi, Bryan D. Downing, Tamara E.C. Kraus, Brian A. Pellerin
Clearing the waters: Evaluating the need for site-specific field fluorescence corrections based on turbidity measurements Clearing the waters: Evaluating the need for site-specific field fluorescence corrections based on turbidity measurements
In situ fluorescent dissolved organic matter (fDOM) measurements have gained increasing popularity as a proxy for dissolved organic carbon (DOC) concentrations in streams. One challenge to accurate fDOM measurements in many streams is light attenuation due to suspended particles. Downing et al. (2012) evaluated the need for corrections to compensate for particle interference on fDOM...
Authors
John Franco Saraceno, James B. Shanley, Bryan D. Downing, Brian A. Pellerin
A river-scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium A river-scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium
Phytoplankton are critical component of the food web in most large rivers and estuaries, and thus identifying dominant controls on phytoplankton abundance and species composition is important to scientists, managers, and policymakers. Recent studies from a variety of systems indicate that ammonium ( NH+4) in treated wastewater effluent decreases primary production and alters...
Authors
Tamara E. C. Kraus, Kurt D. Carpenter, Brian A. Bergamaschi, Alexander Parker, Elizabeth B. Stumpner, Bryan D. Downing, Nicole Travis, Frances Wilkerson, Carol Kendall, Timothy Mussen
Using continuous underway isotope measurements to map water residence time in hydrodynamically complex tidal environments Using continuous underway isotope measurements to map water residence time in hydrodynamically complex tidal environments
Stable isotopes present in water (δ2H, δ18O) have been used extensively to evaluate hydrological processes on the basis of parameters such as evaporation, precipitation, mixing, and residence time. In estuarine aquatic habitats, residence time (τ) is a major driver of biogeochemical processes, affecting trophic subsidies and conditions in fish-spawning habitats. But τ is highly variable...
Authors
Bryan D. Downing, Brian A. Bergamaschi, Carol Kendall, Tamara E. C. Kraus, Kate J. Dennis, Jeffery A. Carter, Travis von Dessonneck
Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model
Reducing uncertainty in data inputs at relevant spatial scales can improve tidal marsh forecasting models, and their usefulness in coastal climate change adaptation decisions. The Marsh Equilibrium Model (MEM), a one-dimensional mechanistic elevation model, incorporates feedbacks of organic and inorganic inputs to project elevations under sea-level rise scenarios. We tested the...
Authors
Kristin B. Byrd, Lisamarie Windham-Myers, Thomas Leeuw, Bryan D. Downing, James T. Morris, Matthew C. Ferner
Science and Products
Filter Total Items: 14
Continuous underway water quality and water isotope measurements in a hydrodynamically complex tidal environment Continuous underway water quality and water isotope measurements in a hydrodynamically complex tidal environment
Real-time, high frequency (1-second sample interval) GPS location, water quality, and water isotope (δ2H, δ18O) data was collected in the Cache Slough Complex (CSC), located in the northern San Francisco Bay Delta (SFBD). Data was collected on 10/01/2014 for an approximate 4-hour period (10:30 14:30 h PST) while underway on the R/V Mary Landsteiner, a 26-foot USGS vessel. Sample water...
Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model
Regional models of tidal marsh elevation response to sea-level rise are needed to support coastal climate change adaptation decisions, including those related to land use planning, habitat management and infrastructure design. The Marsh Equilibrium Model (MEM) is a one-dimensional mechanistic elevation model that incorporates feedbacks of organic and inorganic inputs within the tidal...
Filter Total Items: 38
An introduction to high-frequency nutrient and biogeochemical monitoring for the Sacramento–San Joaquin Delta, northern California An introduction to high-frequency nutrient and biogeochemical monitoring for the Sacramento–San Joaquin Delta, northern California
Executive Summary This report is the first in a series of three reports that provide information about high-frequency (HF) nutrient and biogeochemical monitoring in the Sacramento–San Joaquin Delta of northern California (Delta). This first report provides an introduction to the reasons for and fundamental concepts behind collecting HF measurements, and describes the benefits associated...
Authors
Tamara E.C. Kraus, Brian A. Bergamaschi, Bryan D. Downing
Designing a high-frequency nutrient and biogeochemical monitoring network for the Sacramento–San Joaquin Delta, northern California Designing a high-frequency nutrient and biogeochemical monitoring network for the Sacramento–San Joaquin Delta, northern California
Executive Summary This report is the third in a series of three reports that provide information about how high-frequency (HF) nutrient monitoring may be used to assess nutrient inputs and dynamics in the Sacramento–San Joaquin Delta, California (Delta). The purpose of this report is to provide the background, principles, and considerations for designing an HF nutrient-monitoring network...
Authors
Brian A. Bergamaschi, Bryan D. Downing, Tamara E.C. Kraus, Brian A. Pellerin
Clearing the waters: Evaluating the need for site-specific field fluorescence corrections based on turbidity measurements Clearing the waters: Evaluating the need for site-specific field fluorescence corrections based on turbidity measurements
In situ fluorescent dissolved organic matter (fDOM) measurements have gained increasing popularity as a proxy for dissolved organic carbon (DOC) concentrations in streams. One challenge to accurate fDOM measurements in many streams is light attenuation due to suspended particles. Downing et al. (2012) evaluated the need for corrections to compensate for particle interference on fDOM...
Authors
John Franco Saraceno, James B. Shanley, Bryan D. Downing, Brian A. Pellerin
A river-scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium A river-scale Lagrangian experiment examining controls on phytoplankton dynamics in the presence and absence of treated wastewater effluent high in ammonium
Phytoplankton are critical component of the food web in most large rivers and estuaries, and thus identifying dominant controls on phytoplankton abundance and species composition is important to scientists, managers, and policymakers. Recent studies from a variety of systems indicate that ammonium ( NH+4) in treated wastewater effluent decreases primary production and alters...
Authors
Tamara E. C. Kraus, Kurt D. Carpenter, Brian A. Bergamaschi, Alexander Parker, Elizabeth B. Stumpner, Bryan D. Downing, Nicole Travis, Frances Wilkerson, Carol Kendall, Timothy Mussen
Using continuous underway isotope measurements to map water residence time in hydrodynamically complex tidal environments Using continuous underway isotope measurements to map water residence time in hydrodynamically complex tidal environments
Stable isotopes present in water (δ2H, δ18O) have been used extensively to evaluate hydrological processes on the basis of parameters such as evaporation, precipitation, mixing, and residence time. In estuarine aquatic habitats, residence time (τ) is a major driver of biogeochemical processes, affecting trophic subsidies and conditions in fish-spawning habitats. But τ is highly variable...
Authors
Bryan D. Downing, Brian A. Bergamaschi, Carol Kendall, Tamara E. C. Kraus, Kate J. Dennis, Jeffery A. Carter, Travis von Dessonneck
Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model Forecasting tidal marsh elevation and habitat change through fusion of Earth observations and a process model
Reducing uncertainty in data inputs at relevant spatial scales can improve tidal marsh forecasting models, and their usefulness in coastal climate change adaptation decisions. The Marsh Equilibrium Model (MEM), a one-dimensional mechanistic elevation model, incorporates feedbacks of organic and inorganic inputs to project elevations under sea-level rise scenarios. We tested the...
Authors
Kristin B. Byrd, Lisamarie Windham-Myers, Thomas Leeuw, Bryan D. Downing, James T. Morris, Matthew C. Ferner