Profiles of salinity, temperature, depth, turbidity, and distributions of particle size in suspension collected during four 0.25-day periods in south San Francisco Bay, California, summer 2020

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Frequently anticipated questions:

What does this data set describe?

Title:
Profiles of salinity, temperature, depth, turbidity, and distributions of particle size in suspension collected during four 0.25-day periods in south San Francisco Bay, California, summer 2020
Abstract:
Profiles of salinity, temperature, turbidity, and particle size distribution were collected by the U.S. Geological Survey (USGS) Pacific Coastal and Marine Science Center at two locations in south San Francisco Bay. Data were collected at depth intervals ranging between 0.5 and 2 m (depending on total water depth); sensors remained at each depth for 1 minute. Each profile was collected from surface to bed, and the near-surface region was sampled again at the end of the profile to check steady-state conditions. Profiles were collected for 4 days, for about 7.75 hours each day: Jul 21, 22, 24, and 28, 2020. Data files are grouped by site (channel or shallows) and by instrument (CTD or LISST). Users are advised to assess data quality carefully, and to check metadata for instrument information.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-621-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Allen, Rachel M., and McGill, Samantha, 20211015, Profiles of salinity, temperature, depth, turbidity, and distributions of particle size in suspension collected during four 0.25-day periods in south San Francisco Bay, California, summer 2020: data release doi:10.5066/P99Q4CHM, U.S. Geological Survey, Pacific Coastal and Marine Science Center Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    McGill, Samantha C., Joanne C. T. Ferreira, Allen, Rachel M., and Lacy, Jessica R., 2020, Hydrodynamic, sediment transport, and sediment flocculation data from south San Francisco Bay, California, summer 2020: data release doi:10.5066/P99Q4CHM, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.1788
    East_Bounding_Coordinate: -122.1669
    North_Bounding_Coordinate: 37.5490
    South_Bounding_Coordinate: 37.5413
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/602a9a1ad34eb1203113b18c?name=CSF20_SiteMap.jpg&allowOpen=true (JPEG)
    Map of study area showing locations of USGS profiling sites in south San Francisco Bay.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 21-Jul-2020
    Ending_Date: 28-Jul-2020
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: NetCDF files
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Data were collected at each site and each depth for 1 minute. Refer to self-contained NetCDF files for more location information.
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 1.0E-5. Longitudes are given to the nearest 1.0E-5. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is World Geodetic System 1984 (WGS84).
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    NetCDF files are self-contained and attribute information may be found in the header of the file itself.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Rachel M. Allen
    • Samantha McGill
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    US

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These data were collected to reveal particle size distributions through the water column, along with vertical suspended sediment concentration, salinity, and temperature variation. They were collected as part of a collaborative study funded by the San Francisco Estuary Institute on tidal controls of suspended particle size in South San Francisco Bay. These data are intended for researchers, students, policy makers, and the general public.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 28-Jun-2020 (process 1 of 3)
    Profiles were collected in south San Francisco Bay using a Sequoia Scientific LISST-200X and an RBR CTD-Tu.
    Date: 25-Feb-2021 (process 2 of 3)
    Data were accumulated into NetCDF files.
    Date: 25-Feb-2021 (process 3 of 3)
    Files were named with a convention that uses a 14-digit alpha-numeric code. The first three characters for this dataset are all 'CSF' for the experiment name; the fourth and fifth positions represent the calendar year in which the first data point in the file was taken (20, 2020); the sixth, seventh and eighth characters are an alphanumeric code for the sample type (profiles, PRO). The ninth and tenth characters represent the time index of the profile, starting at 01 for the first profile, and ending at 52 for the last one. The eleventh to twelfth or thirteenth characters are "ls" or "ctd" for the Sequoia Scientific LISST-200X or RBR CTD. The last two characters are "-s" or "-c" for the shallows or channel location.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    Horizontal accuracy derived from GPS instrumentation is less than 5 m.
  3. How accurate are the heights or depths?
    No formal positional accuracy tests were conducted
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted. Data fall within expected ranges.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    USA

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in zipped NetCDF format and are accompanied by CSDGM FGDC-compliant metadata.
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip or other archive utilities. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a NetCDF file. These data can be viewed with the NOAA netCDF file viewer, ncBrowse, which can be downloaded from the internet at https://www.pmel.noaa.gov/epic/java/ncBrowse.

Who wrote the metadata?

Dates:
Last modified: 15-Oct-2021
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA
United States

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P99Q4CHM/CSF20_profiles_metadata.faq.html>
Generated by mp version 2.9.50 on Fri Oct 15 19:10:27 2021