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.

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.

Water temperature, conductivity, and dissolved oxygen data collected at 5 locations in the Sacramento River Deep Water Ship Channel. Each of the 5 stations had a string suspended from a buoy, with instruments located at consistent depths below the water surface. Data were collected at 5- or 10-minute intervals from July 2, 2019 to September 18, 2019.

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.

Conductivity-temperature-depth (CTD) measurements made with a Sontek CastAway CTD instrument, collected in the Sacramento River Deep Water Ship Channel in July and August 2019. Measurements were collected at 5 points on the cross-section at Channel Marker 73, each hour for 30 hours, with four 30-hours studies collected over four consecutive weeks.

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 laboratory measured spectral data associated with discrete surface water samples collected as part of both the CMS and boat mapping sampling efforts. All laboratory-based measurement presented herein were conducted by the U.S. Geological Survey (USGS) Organic Matter Research Laboratory (OMRL) in Sacramento, Calif. The machine-readable (comma separated value, *.csv) files presented herein include spectral data collected using two different instruments: 1) Laboratory-based absorbance and fluorescence measurements on filtered water using an Aqualog (Hansen and others, 2018) and 2) Laboratory-based absorption measurements using a Varian Cary spectrophotometer on particulate samples collected on glass fiber filters (Kishino and others, 1985; Roesler, 1998). The reported spectral data includes: 1) fluorescence intensities across a wide range of excitation (240 to 800 nm) and emission (250 to 800 nm) wavelengths expressed as an excitation-emission matrix (EEM), 2) absorbance of light (from 239 nm to 800 nm) due to dissolved and colloidal substances, and 3) absorption coefficients (from 350 nm to 715 nm) for particulates using the quantitative filter technique (QFT).

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

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

This dataset includes discrete profile measurements of dissolved inorganic carbon, total alkalinity, pH (on total scale), water temperature, salinity, dissolved oxygen, nitrate, nitrite, silicate, phosphate, chlorofluorocarbons and other chemical measurements during the R/V Nathaniel B. Palmer Repeat Hydrography and SOCCOM Cruise NBP18_02 in the Pacific Sector of Southern Ocean: GO-SHIP Section S04P (EXPOCODE 320620180309), from 2018-03-09 - 2018-05-14. The Pacific Ocean S04P repeat hydrographic line was reoccupied for the US Global Ocean Carbon and Repeat Hydrography Program. The survey of S04P 2018 consisted of CTDO, rosette, LADCP, UVP, water samples and underway measurements. The ship departed from the port of Hobart on the island of Tasmania, Australia and completed the cruise in the port of Punta Arenas, Chile.

This dataset includes discrete bottle profile measurements of dissolved inorganic carbon (DIC), total alkalinity, CFCs, temperature, salinity, oxygen and nutrients obtained during the R/V Maria S. Merian cruise MSM60 in the South Atlantic Ocean on GO-SHIP Repeat Hydrography Section A10.5 (EXPOCODE 06M220170104) from 2017-01-04 to 2017-02-01. The Maria S Merian MSM60 expedition was the first basin-wide section across the South Atlantic following the SAMBA/SAMOC line at 34°30’S. The scientific program consisted of full water depth sampling (up to 5300m) using the CTD/O2/lADCP rosette system.