Here we archive data collected during a nitrogen addition field experiment in the Sacramento River Deep Water Ship Channel. Calcium nitrate was added on 8 dates to a segment of the ship channel centered at Navigation Light 74. Prior to and following the nutrient additions, we collected water samples and sensor-based measurements at 7 sites between Navigation Light 70 and 76. Water samples for nutrient analyses were collected in 500 mL High Density Poly Ethylene (HDPE) amber containers from 1 m and 8 m depths using a peristaltic pump. Whole water samples for phytoplankton analysis were collected from 1 m depth in 500 mL clear HDPE containers and immediately preserved with 20 mL of Lugol’s iodine solution (Lugol’s, ENG Scientific, Inc.). We collected a vertically integrated zooplankton sample by lowering a 163 µM net to 8 m (~1 m off the bottom) and raised it using an electric winch. We transferred seston contents into new 250 mL HDPE containers and immediately preserved them with 10 mL of Lugol’s. A 1-mL unfiltered water sample from the surface was collected for bacterioplankton abundance. Vertical profiles of temperature, conductivity, dissolved oxygen, pH, turbidity, and algal fluorescence were made using a YSI EXO2 sonde. Measurements were made at 0.5 m and at 1 m resolution to the bottom. The sensor was allowed to stabilize at each depth for at least 10 seconds prior to data acquisition. In total, we sampled on 27 dates between July 8 and August 26, 2019. Lastly, we also report data used in metabolism calculations. Data include 3 methods for estimating metabolism based on continuous DO measurements, laboratory incubations, and an isotope model. Ancillary data include light extinction, stratification strength, wind speed, and gas transfer velocity, Metabolism measurements range from July 2 to September 18, 2019.

Data were collected in the Sacramento River Deep Water Ship Channel (West Sacramento, CA) in support of a whole-ecosystem experiment investigating whether phytoplankton production and biomass would respond to nitrate additions, which could potentially be exported to food-limited regions in the Sacramento–San Joaquin Delta. The experiment was conducted from July 2 to September 18, 2019. Publications presenting ecosystem metabolism and hydrodynamic results from the experiment are under review, and a publication presenting the overall experiment results is in process. Continuous discharge and water quality data collected at USGS stations in the study area during the experiment are available on NWISWeb: Site 5: https://waterdata.usgs.gov/nwis/inventory/?site_no=383114121350601&agency_cd=USGS CM73: https://waterdata.usgs.gov/nwis/inventory/?site_no=383019121350701&agency_cd=USGS Site 3: https://waterdata.usgs.gov/nwis/inventory/?site_no=382934121350601&agency_cd=USGS

Longitudinal profiles of surface water chemistry were made using a Sea-Bird SUNA optical nitrate sensor and a YSI EXO2 water quality sonde. Water from 0.1 m depth was pumped to sensors configured with flow cells from a moving boat, and data were georeferenced with a Garmin GPS and compiled on a Campbell Sci datalogger. Details on the method can be found in Crawford et al. 2015 and Downing et al. 2016. Data were collected between July 10 and Aug 26, 2019 as part of an ecosystem experiment. Two longitudinal transects were made each day. In the morning, the boat traveled southward from the Sacramento Locks to Navigation Light 70. The afternoon transects proceeded while traveling northward. Each point has also been linearly referenced as distance to the northern terminus of the channel. Linear referencing was done in the R programming language after snapping points to a line running through the channel center.

IOOS Sensor Observation Service (SOS) Server for NANOOS, the Northwest Association of Networked Ocean Observing Systems (http://nanoos.org). Provides access to marine in-situ observation data for the US Pacific Northwest and lower British Columbia, from the NANOOS asset data store harvested and integrated by NVS (NANOOS Visualization System, http://nvs.nanoos.org). To avoid data duplication, currently only assets not otherwise available to the IOOS Catalog (http://catalog.ioos.us) are accessible through this SOS server; for example, assets from most federal agencies are not accessible on this server, but they are available on the NVS application. This NANOOS service is run by the 52North IOOS SOS server software, and complies with the IOOS SOS "Milestone 1" service profile (https://code.google.com/p/ioostech/wiki/SOSGuidelines). This station provides the following variables: H1 redoxpot, Fractional saturation of oxygen in sea water, Mass concentration of oxygen in sea water, Sea water ph reported on total scale, Sea water salinity, Sea water temperature, Surface partial pressure of carbon dioxide in sea water, Omega aragonite, Dissolved inorganic carbon, Total alkalinity

IOOS Sensor Observation Service (SOS) Server for NANOOS, the Northwest Association of Networked Ocean Observing Systems (http://nanoos.org). Provides access to marine in-situ observation data for the US Pacific Northwest and lower British Columbia, from the NANOOS asset data store harvested and integrated by NVS (NANOOS Visualization System, http://nvs.nanoos.org). To avoid data duplication, currently only assets not otherwise available to the IOOS Catalog (http://catalog.ioos.us) are accessible through this SOS server; for example, assets from most federal agencies are not accessible on this server, but they are available on the NVS application. This NANOOS service is run by the 52North IOOS SOS server software, and complies with the IOOS SOS "Milestone 1" service profile (https://code.google.com/p/ioostech/wiki/SOSGuidelines). This station provides the following variables: Fractional saturation of oxygen in sea water, Mass concentration of chlorophyll in sea water, Mass concentration of oxygen in sea water, Sea water ph reported on total scale, Sea water salinity, Sea water temperature

This dataset contains oceanographic and surface meteorological data in netCDF formatted files, which follow the Climate and Forecast metadata convention (CF) and the Attribute Convention for Data Discovery (ACDD). Moss Landing Marine Laboratory collected the data from their in-situ moored station named Monterey Bay Commercial Wharf in the Northeast Pacific Ocean. Central and Northern California Coastal Ocean Observing System (CeNCOOS), which assembles data from Moss Landing Marine Laboratory and other sub-regional coastal and ocean observing systems of the Central and Northern California United States, submitted the data to NCEI as part of the Integrated Ocean Observing System Data Assembly Centers (IOOS DACs) Data Stewardship Program. NCEI updates this dataset when new files are available.

IOOS Sensor Observation Service (SOS) Server for NANOOS, the Northwest Association of Networked Ocean Observing Systems (http://nanoos.org). Provides access to marine in-situ observation data for the US Pacific Northwest and lower British Columbia, from the NANOOS asset data store harvested and integrated by NVS (NANOOS Visualization System, http://nvs.nanoos.org). To avoid data duplication, currently only assets not otherwise available to the IOOS Catalog (http://catalog.ioos.us) are accessible through this SOS server; for example, assets from most federal agencies are not accessible on this server, but they are available on the NVS application. This NANOOS service is run by the 52North IOOS SOS server software, and complies with the IOOS SOS "Milestone 1" service profile (https://code.google.com/p/ioostech/wiki/SOSGuidelines). This station provides the following variables: Fractional saturation of oxygen in sea water, Mass concentration of chlorophyll in sea water, Mass concentration of oxygen in sea water, Sea water ph reported on total scale, Sea water salinity, Sea water temperature

This dataset contains oceanographic and surface meteorological data in netCDF formatted files, which follow the Climate and Forecast metadata convention (CF) and the Attribute Convention for Data Discovery (ACDD). Humboldt State University collected the data from their in-situ moored station named Humboldt Bay Pier in the Northeast Pacific Ocean. Central and Northern California Coastal Ocean Observing System (CeNCOOS), which assembles data from Humboldt State University and other sub-regional coastal and ocean observing systems of the Central and Northern California United States, submitted the data to NCEI as part of the Integrated Ocean Observing System Data Assembly Centers (IOOS DACs) Data Stewardship Program. NCEI updates this dataset when new files are available.

This dataset contains oceanographic and surface meteorological data in netCDF formatted files, which follow the Climate and Forecast metadata convention (CF) and the Attribute Convention for Data Discovery (ACDD). Moss Landing Marine Laboratory collected the data from their in-situ moored station named Monterey Bay Commercial Wharf in the Northeast Pacific Ocean. Central and Northern California Coastal Ocean Observing System (CeNCOOS), which assembles data from Moss Landing Marine Laboratory and other sub-regional coastal and ocean observing systems of the Central and Northern California United States, submitted the data to NCEI as part of the Integrated Ocean Observing System Data Assembly Centers (IOOS DACs) Data Stewardship Program. NCEI updates this dataset when new files are available.