{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Tara Schraga", "hasEmail": "mailto:tschraga@usgs.gov"}, "description": "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. \nAll 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/\nPlease see the VersionHistory.txt for a detailed list of the updates from previous versions.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/F7D21WGF", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.5966abe6e4b0d1f9f05cf551.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5966abe6e4b0d1f9f05cf551", "keyword": ["USGS:5966abe6e4b0d1f9f05cf551", "chlorophyll", "dissolved oxygen", "nutrient content (water)", "salinity", "turbidity", "water quality", "water temperature"], "modified": "2023-03-07T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-122.4717, 37.4717, -121.6883, 38.1517", "theme": ["geospatial"], "title": "USGS measurements of water quality in San Francisco Bay (CA), 2016-2021 (ver. 4.0, March 2023)"}