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Filters Date Range Past year (3) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Angela M Hansen Katy O'Donnell California Water Science Center U.S. Geological Survey Jacob A Fleck More... Categories Data Release - Revised (1) Tag Types Theme (8) Place (8) USGS Scientific Topic Keyword (5) Harvest Set (6) Tag Schemes USGS Thesaurus (6) None (3) Common geographic areas (4) English (3) ISO 19115 Topic Category (8) Common Geographic Areas (1) Geographic Names Information System (1) More... View Results as: JSON ATOM CSV

Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 1.1, December 2023) This dataset contains taxonomy, density (cells/mL), and biovolume (μm3/mL) data for phytoplankton sampled across the Sacramento San Joaquin River Delta and San Francisco Bay (Bay-Delta) beginning in 2016. Whole water phytoplankton samples were collected intermittently during special projects and during routine visits to service continuous monitoring stations. Samples were preserved with Lugol’s iodine solution (2-5 %) immediately after collection and stored in a cool, dark environment until analysis. Preserved whole water samples are sent to BSA Environmental Services (BSA) in Beachwood, Ohio for microscopic identification and enumeration. A Leica DMLB compound microscope is used for enumerating filtered phytoplankton... Categories: Data; Tags: Aquatic Biology, California, Central Valley, Ecology, Liberty Island, All tags... Sacramento River, Sacramento-San Joaquin Delta, Suisun Bay, USGS Science Data Catalog (SDC), United States, Water Quality, Water Resources, biogeochemistry, biota, delta, drinking water use, high frequency, high-resolution, hydrogeology, inlandWaters, nutrient content (water), nutrients, phytoplankton, phytoplankton, public supply water use, statistical analysis, visualization methods, water quality, water quality, Fewer tags Assessing spatial variability of nutrients, phytoplankton and related water-quality constituents in the California Sacramento-San Joaquin Delta at the landscape scale: 2020-2021 High-resolution mapping surveys The dataset documents the spatial and temporal variability of nutrients, phytoplankton, and related water quality parameters at high spatial resolution in the Sacramento-San Joaquin River Delta and Suisun Bay of California, USA. The dataset includes nitrate, ammonium, orthophosphate, dissolved organic carbon, temperature, conductivity, dissolved oxygen, and chlorophyll as well as information about phytoplankton community composition. Data were collected under different environmental/flow conditions in June, July, August, and October of 2020, and May, July, and October of 2021. The data release consists of a .xml document, and .txt and shapefile documents. Descriptions for each document and file are listed in the... Categories: Data; Tags: Aquatic Biology, California, Central Valley, Ecology, Geochemistry, All tags... Hydrology, Liberty Island, Sacramento River, Sacramento-San Joaquin Delta, Suisun Bay, USGS Science Data Catalog (SDC), United States, Water Quality, Water Resources, biogeochemistry, biota, delta, drinking water use, environment, high frequency, high-resolution, hydrogeology, inlandWaters, nutrient content (water), nutrients, phytoplankton, public supply water use, real-time, statistical analysis, visualization methods, water quality, water quality, Fewer tags Flow through system (FTS) and spectral absorption / attenuation sensor (ACS) data from boat mapping transects within the Sacramento-San Joaquin River Delta The goal of this study was to develop a suite of inter-related water quality monitoring approaches capable of modeling and estimating the spatial and temporal gradients of particulate and dissolved total mercury (THg) concentration and particulate and dissolved methyl mercury (MeHg) concentration in surface waters across the Sacramento / San Joaquin River Delta (SSJRD). This suite of monitoring approaches included: a) data collection at fixed continuous monitoring stations (CMS) outfitted with in-situ sensors, b) spatial mapping using boat-mounted, flow-through, sensors and c) satellite-based remote sensing. The focus of this specific Child Page is to present all data collected during the underway boat mapping component... Categories: Data; Tags: California, Lower Sacramento, Sacramento, San Francisco Bay, San Joaquin Delta, All tags... Solano, Yolo, chemical analysis, dissolved organic compounds, environment, environmental proxies, field inventory and monitoring, field sampling, nutrient content (water), optical methods, oxygen content (water), real-time monitoring and reporting, salinity, surface water quality, suspended material (water), transect sampling, water chemistry, water column reflectivity, water pH, water properties, water sampling, water sampling, water temperature, Fewer tags Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the San Francisco Bay, California: 2021-2022 High-resolution mapping surveys The dataset documents the spatial and temporal variability of nutrients and related water quality parameters at high spatial resolution in the San Francisco Bay of California, USA in 2021 and 2022. The dataset includes nitrate, temperature, conductivity, dissolved oxygen, and chlorophyll as well as information about phytoplankton community composition. Data-collection cruises were conducted under different environmental/flow conditions. Version history: On 3/15/24, the provisional data files hosted on this webpage were removed, and replaced with updated finalized files. Categories: Data; Tags: California, San Francisco Bay, San Pablo Bay, Suisun Bay, USGS Science Data Catalog (SDC), All tags... United States, bay, biogeochemistry, biota, drinking water use, environment, high frequency, high-resolution, hydrogeology, inlandWaters, nutrient content (water), nutrients, phytoplankton, public supply water use, real-time, statistical analysis, visualization methods, water quality, water quality, Fewer tags Data from the development and testing of a multiparameter standard solution for fluorescent dissolved organic matter (fDOM) and algal fluorescence (fChl) (ver. 2.0, July 2022) Optical sensors measuring fluorescence of non-biological sources (e.g., dissolved organic matter, wastewater, hydrocarbons, fluorescent dyes, etc.; hereafter referred to as fDOM) are increasingly used in water quality studies because they provide proxy measurements for a variety of contaminants and constituents of concern including metals, wastewater effluent, and DOM (measured in the lab as dissolved organic carbon, (DOC)) concentrations. Similarly, sensors measuring biological (algal) fluorescence (hereafter referred to as chlorophyll (fChl) and phycocyanin (fPC), have gained popularity to measure phytoplankton concentration, biomass, and even primary productivity. As additional sensors are coupled with ongoing... Categories: Data, Data Release - Revised; Tags: California, California Water Science Center, EXO YSI, Organic Matter Research Laboratory, Sacramento, All tags... USGS Science Data Catalog (SDC), Water Quality, continuous monitoring, environment, fChl, fDOM, fPC, fluorescence, high frequency, optical sensor, organic matter, standard solution, water quality, Fewer tags Data from the development and testing of a multiparameter standard solution for fluorescent dissolved organic matter (fDOM) and algal fluorescence (fChl) Note: this data release has been superseded by version 2.0, available here: https://doi.org/10.5066/P91LJNAU Optical sensors measuring fluorescent dissolved organic matter (fDOM) are increasingly being used in water quality studies because they provide proxy measurements for dissolved organic matter concentrations (DOC). Similarly, chlorophyll-a (chl-a) fluorescence sensors have gained popularity as a means to measure phytoplankton concentration, biomass, and even primary productivity using various approaches. As additional sensors are grouped for in situ monitoring, field calibration checks are becoming quite time consuming for even the basic set of sensors (i.e. pH, specific conductivity, turbidity) that require... Categories: Data; Tags: California, California Water Science Center, EXO YSI, Organic Matter Research Laboratory, Sacramento, All tags... USGS Science Data Catalog (SDC), Water Quality, continuous monitoring, environment, fChl, fDOM, fluorescence, high frequency, optical sensor, organic matter, standard solution, water quality, Fewer tags High resolution temporal surface water data from four continuous monitoring stations within the Sacramento-San Joaquin River Delta The goal of this study was to develop a suite of inter-related water quality monitoring approaches capable of modeling and estimating the spatial and temporal gradients of particulate and dissolved total mercury (THg) concentration, and particulate and dissolved methyl mercury (MeHg), concentration, in surface waters across the Sacramento / San Joaquin River Delta (SSJRD). This suite of monitoring approaches included: a) data collection at fixed continuous monitoring stations (CMS) outfitted with in-situ sensors, b) spatial mapping using boat-mounted flow-through sensors, and c) satellite-based remote sensing. The focus of this specific child page is to document the temporal high-resolution (15 minute) in-situ sensor... Categories: Data; Tags: California, San Joaquin Delta, environment, field monitoring stations, surface water (non-marine), All tags... surface water quality, time series datasets, water chemistry, water circulation, water pH, water properties, water quality, water sampling, water temperature, Fewer tags Assessing spatial variability of nutrients, phytoplankton, and related water quality constituents in the California Sacramento-San Joaquin Delta during treated wastewater effluent holds: August and September 2019 high resolution mapping surveys The study is comprised of daily survey data consisting of high resolution mapping and discrete sample collection of nutrients, phytoplankton, and related water quality constituents conducted in the Sacramento River, Georgiana Slough, and the North and South Forks of the Mokelumne River on August 28 and September 10-12, 2019, coincident with planned holds of treated wastewater effluent from Sacramento Regional Wastewater Treatment Plant (SRWTP) on August 27 and September 9-11, 2019. Categories: Data; Tags: Aquatic Biology, California, Central Valley, Georgiana Slough, Lower Sacramento, All tags... Mokelumne River, Sacramento River, Sacramento-San Joaquin Delta, USGS Science Data Catalog (SDC), United States, Water Quality, biogeochemistry, biota, drinking water use, environment, high-resolution, hydrogeology, inlandWaters, nutrient content (water), nutrients, phytoplankton, public supply water use, real-time, statistical analysis, visualization methods, water quality, Fewer tags