Suspended sediment concentrations from water samples collected in San Pablo Bay and Grizzly Bay, California, 2020

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Frequently anticipated questions:

What does this data set describe?

Title:
Suspended sediment concentrations from water samples collected in San Pablo Bay and Grizzly Bay, California, 2020
Abstract:
Water samples were collected in San Pablo Bay and Grizzly Bay on five days from January through June 2020. The water samples were collected from a small vessel near pre-established USGS instrument moorings using a peristaltic pump or a Niskin bottle. Data are provided in a comma-delimited values spreadsheet.
Supplemental_Information:
Information about the data collection field activity can be found at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-603-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?
    McGill, Samantha C., WinklerPrins, Lukas, Lacy, Jessica R., and Tan, Angela C., 20210915, Suspended sediment concentrations from water samples collected in San Pablo Bay and Grizzly Bay, California, 2020: data release doi:10.5066/P9N88U5G, 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., Lacy, Jessica R., Joanne C. T. Ferreira, Allen, Rachel M., WinklerPrins, Lukas, Stevens, Andrew W., and Tan, Angela C., 2021, Hydrodynamic and sediment transport data from San Pablo Bay and Grizzly Bay, California, 2020: data release doi:10.5066/P9N88U5G, 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: -122.39880
    East_Bounding_Coordinate: -122.04072
    North_Bounding_Coordinate: 38.11671
    South_Bounding_Coordinate: 38.07914
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/60a455b7d34ea221ce45ed49?name=ERO20_study_area.jpg &allowOpen=true (JPEG)
    Digital elevation model (DEM) of study area showing locations of USGS moorings in San Pablo Bay (PBM) and Grizzly Bay (GBM).
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 22-Jan-2020
    Ending_Date: 23-Jun-2020
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  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 in San Pablo Bay and Grizzly Bay, California
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (105)
    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?
    ERO20_ssc_water_sample_data.csv
    Table containing attribute information associated with the dataset (Source: Producer defined)
    FAN ID
    U.S. Geological Survey field activity number (FAN). (Source: Producer defined)
    ValueDefinition
    2020-603-FASamples collected during USGS field activity 2020-603-FA. Additional information about this field activity can be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-603-FA
    Sample ID
    Sample identifier. (Source: Producer defined) Identifier for samples; assigned in the field. Duplicate identifiers signify replicates.
    Date Collected
    Date in month/day/year format of sample collection. (Source: Producer defined)
    Range of values
    Minimum:01/22/2020
    Maximum:06/23/2020
    Units:Date in month/day/year format
    Time (PDT)
    Time of sample collection, in hours:minutes:seconds format, Pacific Daylight Time (PDT). (Source: Producer defined)
    Range of values
    Minimum:01:15:10
    Maximum:12:38:00
    Units:hours:minutes:seconds format, Pacific Daylight Time (PDT)
    Location
    Code identifying sampling locations. (Source: Producer defined)
    ValueDefinition
    GBMGrizzly Bay Mooring
    GSTGrizzly Bay Spider Tripod
    PBMSan Pablo Bay Mooring
    PSTSan Pablo Bay Spider Tripod
    SPB1San Pablo Bay 1
    SPB2San Pablo Bay 2
    SPB3San Pablo Bay 3
    GB1Grizzly Bay 1
    GB2Grizzly Bay 2
    Water column location
    The depth or elevation above the bed, that the sample was collected from. (Source: Producer defined) Values indicating sampling locations within the water column. Values followed by "cmbs" were collected in centimeters below the surface of the water. Values followed by cmab were collected in centimeters above the bed.
    Latitude
    Latitude of sample location in decimal degrees, north. (Source: Producer defined)
    Range of values
    Minimum:38.07914
    Maximum:38.11671
    Units:Decimal degrees
    Longitude
    Longitude of sample location in decimal degrees, east. (Source: Producer defined)
    Range of values
    Minimum:-122.39880
    Maximum:-122.04072
    Units:Decimal degrees
    Sample Notes
    Relevant information regarding the sample during its collection or processing. "NA" indicates no additional information was noted. (Source: Producer defined) Unique note of relevant information regarding sample
    Aliquit Volume (mL)
    The volume of sample used for the analysis in milliliters (mL). (Source: producer defined)
    Range of values
    Minimum:65
    Maximum:248
    Units:milliliters
    Sediment Weight (g)
    The weight of the sediment in grams (g). (Source: producer defined)
    Range of values
    Minimum:1.18
    Maximum:35.66
    Units:milligrams
    Suspended Sediment Concentration mg/L
    The suspended sediment concentration from the sample. (Source: producer defined)
    Range of values
    Minimum:12.56
    Maximum:414.58
    Units:milligram per liter

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Samantha C. McGill
    • Lukas WinklerPrins
    • Jessica R. Lacy
    • Angela C. Tan
  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

    831-460-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These data were collected to calibrate turbidity data from optical backscatter sensors to suspended-sediment concentration. They were collected as part of a collaborative study between the USGS Coastal and Marine Hazards and Resources Program, the USGS California Water Science Center, and the USGS Water Resource Mission Area investigating physical and biological controls on bed erodibility. 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: 23-Jun-2020 (process 1 of 3)
    Water samples were collected from January 2020 to June 2020 using a peristaltic pump or Niskin bottle. Sampling positions were recorded using a hand-held global navigation satellite system (GNSS) receiver. Samples were placed in cold storage until processed.
    Date: 29-Jun-2020 (process 2 of 3)
    The suspended sediment concentrations of the samples were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Suspended sediment concentrations were determined by a filtering a known volume of sample through a pre-weighed filter, which is then dried and reweighed to determine the mass of suspended sediment on the filter.
    Date: 29-Jun-2020 (process 3 of 3)
    Suspended sediment concentrations were calculated by subtracting the weight of the filter from the weight of the reweight (post filtering) filter. The resulting weight (in milligrams) is divided by the volume of sample filtered (in liters) to get the concentration of suspended sediments.
  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. Data fall within expected ranges.
  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 (USGS) as the originator of the dataset and in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    U.S. Geological Survey
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    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 csv format (ERO19_ssc_water_sample_data.csv) accompanied by CSDGM FGDC-compliant metadata and an image map of the study area.
  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 data is available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel.

Who wrote the metadata?

Dates:
Last modified: 15-Sep-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_P9N88U5G/ERO20_ssc_water_sample_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:24 2021