USGS measurements of water quality in San Francisco Bay (CA), 2016-2021 (ver. 4.0, March 2023)

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.

                                            [
  "010:12"
]
                                        

                                            {
  "fn": "Tara Schraga",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:tschraga@usgs.gov"
}
                                        

                                            [
  {
    "@type": "dcat:Distribution",
    "title": "Digital Data",
    "format": "XML",
    "accessURL": "https://doi.org/10.5066/F7D21WGF",
    "mediaType": "application/http",
    "description": "Landing page for access to the data"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Original Metadata",
    "format": "XML",
    "mediaType": "text/xml",
    "description": "The metadata original format",
    "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.5966abe6e4b0d1f9f05cf551.xml"
  }
]
                                        

                                            [
  "USGS:5966abe6e4b0d1f9f05cf551",
  "chlorophyll",
  "dissolved oxygen",
  "nutrient content (water)",
  "salinity",
  "turbidity",
  "water quality",
  "water temperature"
]
                                        

                                            {
  "name": "U.S. Geological Survey",
  "@type": "org:Organization"
}
                                        

                                            [
  "Geospatial"
]