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The U.S. Geological Survey maintains a program of water-quality studies in San Francisco Bay (CA) that began in 1969. This Data Release archives and makes available all measurements made from 1969 through 2015. Water-quality constituents include salinity, temperature, light extinction coefficient, chlorophyll-a, dissolved oxygen, suspended particulate matter, nitrate, nitrite, ammonium, silicate and phosphate. Time, Julian date, and three constituents were added retroactively in 2023 to all years: ratio of chlorophyll-a and pheopigments, oxygen percent saturation, and density as Sigma-t. Water samples were collected along a 145-km transect from lower South San Francisco Bay to the lower Sacramento River. Samples were collected at 59 fixed sampling locations, of these 37 became standard long-term sampling stations. All stations are listed in the station location table (SFBstationlocations_19692015.csv) and standard stations are shown on the map (sfbaymap.jpg)

The U.S. Geological Survey maintains a program of water-quality studies in San Francisco Bay (CA) that began in 1969. We plan a USGS Data Release to archive and make available all measurements made from 1969 through 2015. Water-quality constituents include salinity, temperature, light attenuation coefficient, and concentrations of chlorophyll-a, dissolved oxygen, suspended particulate matter, nitrate, nitrite, ammonium, silicate and phosphate. Water samples are collected at 37 fixed sampling locations along a 145-km transect from lower South San Francisco Bayo the lower Sacramento River. A map of sampling locations is available on the project website at: https://sfbay.wr.usgs.gov/access/wqdata/overview/wherewhen/stnmap.html

The U.S. Geological Survey maintains a program of water-quality studies in San Francisco Bay (CA) that began in 1969. This USGS Data Release archives and makes available all measurements from 2016-2021. Water-quality constituent measurements were collected aboard a research vessel. Sensor constituents include salinity, temperature, oxygen, and light attenuation coefficient. From these constituents, three parameters are derived: ratio of chlorophyll-a and pheopigments, oxygen percent saturation, and density as Sigma-t. Water sample constituents collected for later analysis include chlorophyll-a, suspended particulate matter, nitrate, nitrite, ammonium, silicate and phosphate. These discrete water samples were collected at near surface (2m) by a fixed depth pump or at depth using a Niskin water sampler on a depth-marked line. The sampling was conducted monthly at 37 fixed sampling locations along a 145-km transect from lower South San Francisco Bay to the lower Sacramento River. Additional sampling cruises at a subset of stations (South and Central Bay) were conducted 0-3 times a month. All stations are listed in the station location table (SFBay_TableofStationLocations.csv) and standard stations are shown on the map (sfbaymap.jpg). A prior USGS Data Release contains the 1969-2015 data https://www.sciencebase.gov/catalog/item/5841f97ee4b04fc80e518d9f. The project website contains more details about this research program and data collection https://sfbay.wr.usgs.gov/access/wqdata/. The website includes a public database where data from all program years can be accessed and downloaded https://sfbay.wr.usgs.gov/water-quality-database/ Please see the VersionHistory.txt for a detailed list of the updates from previous versions.

Three CTD surveys were conducted throughout Mobile Bay on a small boat on 2016-07-11, 2016-07-16 and 2016-07-19. Data includes individual CTD cast dates and locations. The data files are in netcdf format.

The Water Quality Act of 1987 established the National Estuary Program, which has as one of its objectives the formation of citizen groups for monitoring the quality of coastal waters. One such group that formed to monitor Mobile Bay was called Baywatch. Under the guidance of Dr. George Crozier of the Dauphin Island Sea Lab (DISL), and in association with the Mobile Field Office of the Alabama Department of Environmental Management (ADEM), citizens were trained to collect and analyze water samples once a week between 10am and 2pm for 50 stations located in the Mobile Bay delta, Mississippi Sound, Weeks Bay, Perdido Bay, and several local streams. Parameters measured included water temperature, salinity, dissolved oxygen, turbidity, air temperature, and rainfall. Water temperature, salinity, and dissolved oxygen were measured from both surface and bottom waters where possible. The purpose of this study was to provide a better understanding of the processes affecting the waters of coastal Alabama.

Water physical and chemical data were collected using current meter and bottle casts from the GILLISS and other platforms from February 4, 1976 to September 14, 1976. Data were submitted by Virginia Institute of Marine Science - Gloucester Point, as part of the Ocean Continental Shelf - Mid Atlantic (OCS - Mid Atlantic) project. Data were processed by NODC to the NODC standard Current Meter Data (F015) format. The F014 format is designed to support studies of physical and chemical observations on the water column. Reported are measurements of temperature, salinity, conductivity, dissolved oxygen, nitrate, nitrite, ammonia, orthophosphate, and organic carbon. The format consists of four data record types, 80 characters in length, sorted by station and sequence numbers for proper order. The first nine columns for all records are to be used for file type (columns 1-3) and file identifier (columns 4-9). The file identifier, to be assigned by the originator, is an unique originator id for each data submission. After submission, the NODC reassigns to this field an unique NODC identifier for internal use.

This dataset contains observations made by the Institute of Ocean Sciences of Fisheries and Oceans (DFO) using water samples and CTD profiles collected during their seasonal Biophysical survey of the Salish Sea. Data set includes nitrate, nitrite, silicate, phosphate, oxygen, salinity, water temperature, and chlorophyll measurements. This dataset is the U.S. State Department MSR RATS U2022-041. Data are in NetCDF.