Total suspended solids and particle size distributions from grab samples collected during four 0.25-day profiling periods in south San Francisco Bay, California, summer 2020

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
Total suspended solids and particle size distributions from grab samples collected during four 0.25-day profiling periods in south San Francisco Bay, California, summer 2020
Abstract:
Water samples were collected in south San Francisco Bay on four days in July 2020. The water samples were collected near pre-established USGS instrument moorings with a Niskin bottle, lowered from the R/V Snavely. Data are provided in comma-delimited values spreadsheets.
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., McGill, Samantha C., and Tan, Angela C., 20211015, Total suspended solids and particle size distributions from grab samples collected during four 0.25-day profiling 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.

    Allen, Rachel M., Lacy, Jessica R., McGill, Samantha C., and Ferreira, Joanne C.T., 2021, 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/602a9a2ed34eb1203113b18e?name=CSF20_SiteMapjpg&allowOpen=true (JPG)
    Map of study area showing locations of USGS moorings in San Francisco South 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: 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 south San Francisco Bay, California
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (99)
    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?
    CSF20_TSS_water_sample_data.csv
    Table containing attribute information associated with the dataset (Source: Producer defined)
    FAN_ID
    Unique U.S. Geological Survey field activity number (FAN). (Source: Producer defined) Unique U.S. Geological Survey field activity number (FAN).
    SampleID
    Sample identifier for sediment lab in WX-YY format, where WX is the 2-digit sample/site identifier (for example WC=Water Channel, WS=Water Shallows) and YY is a sequential number given to the sample in the lab. (Source: Producer defined) Unique identifier for samples; assigned in the sediment lab.
    DateCollected
    Date in month/day/year format of sample collection. (Source: Producer defined)
    Range of values
    Minimum:07/21/2020
    Maximum:07/28/2020
    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:07:05:47
    Maximum:15:36:00
    Units:hours:minutes:seconds format, Pacific Daylight Time (PDT)
    WaterColumnLocation(mbs)
    The depth below the surface of the water, in meters, that the sample was collected from. (Source: Producer defined)
    Range of values
    Minimum:1
    Maximum:13
    Units:meters below water surface
    Latitude
    Latitude of sample location in decimal degrees, north, in WGS84 horizontal datum. (Source: Producer defined)
    Range of values
    Minimum:37.54217
    Maximum:37.54740
    Units:Decimal degrees
    Longitude
    Longitude of sample location in decimal degrees, east, in WGS84 horizontal datum. (Source: Producer defined)
    Range of values
    Minimum:-122.17661
    Maximum:-122.16910
    Units:Decimal degrees
    SampleNotes
    Relevant information regarding the sample during its collection or processing. "NA" indicates no sample notes were taken (Source: Producer defined) Unique note of relevant information regarding sample
    AliquotVolume(mL)
    The volume of sample used for the analysis. (Source: producer defined)
    Range of values
    Minimum:59
    Maximum:255
    Units:milliliters
    SedimentWt(mg)
    The weight of the sediment. (Source: producer defined)
    Range of values
    Minimum:1.48
    Maximum:19.50
    Units:milligrams
    TotalSuspendedSolids(mg/L)
    The total suspended solids from the sample. (Source: producer defined)
    Range of values
    Minimum:12.58
    Maximum:165.53
    Units:milligram per liter
    FlocCamSample_SummaryInformation.csv
    Table containing attribute information associated with the dataset (Source: Producer defined)
    FlocCamFileName
    File name of the original video recorded in the field with raw FlocCam images. (Source: Producer defined) Unique identifier for samples; assigned in the field.
    Site
    Site of sample collection. (Source: Producer defined) Descriptor of sample collection location; assigned in the field.
    DateCollected
    Date in month/day/year format of sample collection. (Source: Producer defined)
    Range of values
    Minimum:07/22/2020
    Maximum:07/22/2020
    Units:Date in month/day/year format
    TimeSampleCollected
    Time of sample collection, in hours:minutes:seconds format, Pacific Daylight Time (PDT), (Source: Producer defined)
    Range of values
    Minimum:08:22:20
    Maximum:12:55:17
    Units:hours:minutes:seconds format, Pacific Daylight Time (PDT)
    AJMFlocCamSampleNumber
    Sample number assigned in processing by AJ Manning. Matches the last 3 characters of each SCATTER_ D_Ws_Den - SXX.csv. (Source: Producer defined) Unique identifier for samples; assigned in the lab.
    TSSSampleID
    Sample number of associated TSS sample collected simultaneously. (Source: Producer defined) Cross-reference indentifier to locate associated TSS sample.
    TSS(mg/l)
    Approximate value of associated TSS. (Source: Producer defined)
    Range of values
    Minimum:20
    Maximum:115
    Units:milligram per liter
    SampleDepth
    The depth below the surface of the water, in meters, that the sample was collected from. (Source: Producer defined)
    Range of values
    Minimum:1
    Maximum:12
    Units:meters below water surface
    SCATTER_ D_Ws_Den_SXX.csv
    Table containing floc information contained in sample SXX, where SXX represents the sample number defined in FlocCamSample_SummaryInformation.csv, field "AJMFlocCamSampleNumber". (Source: Producer defined)
    Size(microns)
    Measured floc size. (Source: Producer defined)
    Range of values
    Minimum:35
    Maximum:578
    Units:micrometers
    EffectiveDensity(kg/m^3)
    Effective density of floc. (Source: Producer defined)
    Range of values
    Minimum:9
    Maximum:1590
    Units:kg/m^3
    Ws(mm/s)
    Settling velocity of floc. (Source: Producer defined)
    Range of values
    Minimum:0.078
    Maximum:25
    Units:mm/s
    FractalDimension(nf)
    Floc fractal dimension. (Source: Producer defined)
    Range of values
    Minimum:1.64
    Maximum:3.1
    Units:NA
    Height_Width_ratio
    Ratio of floc height to width. (Source: Producer defined)
    Range of values
    Minimum:0.29
    Maximum:13.1
    Units:NA
    Porosity(%)
    Floc porosity (Source: Producer defined)
    Range of values
    Minimum:-27
    Maximum:99
    Units:percent
    Entity_and_Attribute_Overview:
    CSF20_TSS_water_sample_data.csv contains water sample parameters; CSF20_FlocCam_data.zip contains csv files: one (FlocCamSample_SummaryInformation.csv) representing an overview of the individual samples, and 18 files (SCATTER_ D_Ws_Den_SXX) each containing data. Please read the Entity and Attribute section for further details.
    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 C. McGill
    • 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 total suspended solids. Selected samples were also analyzed visually for particle size and settling velocity using the FlocCam. They were collected as part of a study by the USGS Coastal and Marine Hazards and Resources Program, funded by the San Francisco Estuary Institute, investigating physical drivers of sediment flocculation. 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-Jul-2020 (process 1 of 4)
    Water samples were collected in July, 2020 using a Niskin bottle. Sampling positions were recorded using a boat-mounted global navigation satellite system (GNSS) receiver. Samples were placed in cold storage until processed. Additional video imagery was collected of selected samples consistent with methods for FlocCam analysis.
    Date: 02-Sep-2020 (process 2 of 4)
    The total suspended solids were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Total suspended solids were determined by 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: 02-Sep-2020 (process 3 of 4)
    Total suspended solids were calculated by subtracting the weight of the filter from the weight of the reweighed (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.
    Date: 01-Sep-2021 (process 4 of 4)
    Particle size, settling velocity, and effective density of individual flocs was computed visually from the video images, consistent with methods for the FlocCam (Manning and Dyer, 2007).
  3. What similar or related data should the user be aware of?
    Manning, Andrew J., and Dyer, K. R., 2007, Mass settling flux of fine sediments in Northern European estuaries: Measurements and predictions: Journal article Marine Geology, v. 245, n. 1-4, p. 107-122, Elsevier, Netherlands.

    Online Links:

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 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 data are 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-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_TSS_water_sample_metadata.faq.html>
Generated by mp version 2.9.50 on Fri Oct 15 19:10:27 2021