Percent Carbon content from suspended sediment in water samples collected Whale's Tail South marsh tidal creeks in South San Francisco Bay, California, Winter 2021-2022

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Frequently anticipated questions:

What does this data set describe?

Title:
Percent Carbon content from suspended sediment in water samples collected Whale's Tail South marsh tidal creeks in South San Francisco Bay, California, Winter 2021-2022
Abstract:
Water samples were collected in Whale's Tail South marsh tidal creeks on December 3 and 6, 2021 and January 3, 2022 and processed to determine percent carbon in the samples. The water samples were collected near pre-established USGS instrument moorings with a Niskin bottle.
Supplemental_Information:
Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-660-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., Ferreira, Joanne C.T., and Tan, Angela C., 20230412, Percent Carbon content from suspended sediment in water samples collected Whale's Tail South marsh tidal creeks in South San Francisco Bay, California, Winter 2021-2022: data release doi:10.5066/P972R6AW, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Ferreira, Joanne C.T., Lacy, Jessica R., McGill, Samantha C., WinklerPrins, Lukas T., Nowacki, Daniel J., Stevens, Andrew W., and Tan, Angela C., 2023, Hydrodynamic and sediment transport data from Whale's Tail South marsh and adjacent waters in South San Francisco Bay, California 2021-2022: data release doi:10.5066/P972R6AW, 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: -122.142046
    East_Bounding_Coordinate: -122.141240
    North_Bounding_Coordinate: 37.58642
    South_Bounding_Coordinate: 37.58374
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 03-Dec-2021
    Ending_Date: 03-Jan-2022
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Comma-separated values
  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 Francisco Bay, California
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (18)
    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?
    WTW21_SSC_percentCarbon.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
    2021-660-FASamples collected during USGS field activity 2021-660-FA. Additional information about this field activity can be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-660-FA
    Sample ID
    Sample identifier (Source: Producer defined) Unique identifier for samples; assigned in the field.
    Lab ID
    Sample identifier for sediment lab in YY-FFFFF-XX format, where YY is the 2-digit year (for example 20=2020), FFFFF is the 5-digit field-activity-number (FAN) ID code, and XX is a sequential number given to the sample in the lab. (Source: Producer defined) Unique identifier for samples; assigned in the sediment lab.
    Date Collected
    Date in month/day/year format of sample collection. (Source: Producer defined)
    Range of values
    Minimum:12/03/2021
    Maximum:001/03/2022
    Units:Date in month/day/year format
    Time (UTC)
    Time of sample collection, in hours:minutes:seconds format, Coordinated Universal Time (UTC) (Source: Producer defined)
    Range of values
    Minimum:00:00:00
    Maximum:23:59:59
    Units:hours:minutes:seconds format, Coordinated Universal Time (UTC)
    Water column location
    The elevation above the bed from which the sample was collected. "Surface" indicates the location just under the surface of the water. (Source: Producer defined) Values indicating sampling locations within the water column. 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:37.583740
    Maximum:37.586420
    Units:Decimal degrees
    Longitude
    Longitude of sample location in decimal degrees, east. (Source: Producer defined)
    Range of values
    Minimum:-122.142046
    Maximum:-122.141240
    Units:Decimal degrees
    Total Depth (m)
    Water depth at time of sampling. (Source: Producer defined)
    Range of values
    Minimum:0.4
    Maximum:3.0
    Units:meters
    Sample Notes
    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
    Wt. percent total carbon
    Total weight percentage of total carbon for sample. (Source: producer defined)
    Range of values
    Minimum:1.964
    Maximum:4.102
    Units:percentage
    Wt. percent total organic carbon
    Total weight percentage of organic carbon for sample. (Source: producer defined)
    Range of values
    Minimum:1.946
    Maximum:4.096
    Units:percentage
    Wt. percent total inorganic carbon
    Total weight percentage of inorganic carbon for sample. (Source: producer defined)
    Range of values
    Minimum:0.000
    Maximum:0.044
    Units:percentage
    Wt. percent calcium carbonate
    Total weight percentage of calcium carbonate (CaCO3) for sample. (Source: producer defined)
    Range of values
    Minimum:0.000
    Maximum:0.368
    Units:percentage

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
    • Joanne C.T. Ferreira
    • 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?

Percent carbon was measured to characterize carbon fluxes into and out of tidal creeks. The samples were collected as part of a study to quantify sediment fluxes and changes in marsh morphology at Whale's Tail marsh in southern 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: 03-Jan-2022 (process 1 of 2)
    Water samples were collected 12/3/2021, 12/6/2021 and 1/3/2022 during the king tides using a 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: 27-Apr-2022 (process 2 of 2)
    The suspended sediment percent carbon measurements were made in the USGS Pacific Coastal and Marine Science Center sediment and carbon labs. The water-sediment samples were centrifuged to remove the water and concentrate the sediment. The sediment was dried and then pulverized into a fine powder. To obtain percent total carbon (TC), approximately 20mg of the pulverized sample was weighed and wrapped in an aluminum tin. A UIC CM 5200 furnace attached to a CM 5017 coulometer was used to incinerate the samples at 950 degree C which converted the produced CO2 into a value to obtain total carbon as percent dry weight. For percent total inorganic carbon (TIC), approximately 20mg of sample was weighed into capsules and placed in glass sample tubes which were loaded into a UIC CM 5230 acid digester attached to a CM 5017 coulometer. The samples were digested with 2mL perchloric acid and the produced CO2 was measured to obtain a total inorganic carbon value as percent dry weight. To determine percent calcium carbonate of a sample, the percent TIC value was multiplied by 8.333. The percent total organic carbon (TOC) value was determined by subtracting the percent TIC value from the percent TC value. Two analyses were run per system and the results were averaged.
  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?
    Data values are within the expected values. All samples were taken along known transects between fixed locations, with trajectory dependent upon current speed and direction. When no GPS was available approximate location was estimated from known equipment location.
  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. Due to high currents, sample height above bottom is nominal and could not be consistently achieved. Total depth recorded by a handheld range finder approximately +- 20 cm.
  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?
    Data values are within the expected values with the majority of the carbon in the sample of organic origin

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 - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in csv format (WTW21_SSC_percentCarbon.csv) 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?
    • Availability in digital form:
      Data format: file contains the csv table in format comma-delimited text (version Microsoft Excel 2002 (12527.20988) 64-bit) Size: 0.003
      Network links: https://doi.org/10.5066/P972R6AW
    • Cost to order the data: None.

  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: 19-Apr-2023
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/CMGDS_DR_tool/DR_P972R6AW/WTW21_SSC_percentCarbon_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Apr 28 10:32:11 2023