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.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "Tara Schraga", "@type": "vcard:Contact", "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. 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. |
| distribution |
[ { "@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" } ] |
| 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 |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| 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) |
