Suspended sediment concentrations from water samples collected from the shallows and a tidal creek of Northern San Francisco Bay, California, 2022-2023

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Frequently anticipated questions:

What does this data set describe?

Title:
Suspended sediment concentrations from water samples collected from the shallows and a tidal creek of Northern San Francisco Bay, California, 2022-2023
Abstract:
Water samples were collected in San Pablo Bay, Corte Madera Bay, and a tidal creek in Corte Madera Marsh between April 2022 and June 2023 to measure suspended-sediment concentrations and percent carbon of suspended sediment. The water samples were collected near the USGS instrument platforms (see time-series data page) with a peristaltic pump, via a Niskin sampler, or directly with a sample bottle.
Supplemental_Information:
Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-619-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-603-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., and Tan, Angela C., 20240806, Suspended sediment concentrations from water samples collected from the shallows and a tidal creek of Northern San Francisco Bay, California, 2022-2023: data release DOI:10.5066/P1XZFGCX, 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., Ferreira, Joanne C.T., Nowacki, Daniel J., Stevens, Andrew W., and Tan, Angela C., 2024, Hydrodynamic and sediment transport data from two marshes and adjacent shallows in Northern San Francisco Bay, California 2022-2023: data release DOI:10.5066/P1XZFGCX, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: McGill, S.C., Lacy, J.R., Ferreira, J.C.T., Nowacki, D.J., Stevens, A.W., and Tan, A.C., 2024, Hydrodynamic and sediment transport data from two marshes and adjacent shallows in Northern San Francisco Bay, California 2022-2023: U.S. Geological Survey data release, https://doi.org/10.5066/P1XZFGCX.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.50600
    East_Bounding_Coordinate: -122.44405
    North_Bounding_Coordinate: 38.11239
    South_Bounding_Coordinate: 37.92245
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 12-Apr-2022
    Ending_Date: 02-Jun-2023
    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 (304)
    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?
    NBM22_SSC_percentcarbon_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
    2022-619-FASamples collected during USGS field activity 2022-619-FA. Additional information about this field activity can be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-619-FA.
    2023-603-FASamples collected during USGS field activity 2023-603-FA. Additional information about this field activity can be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-603-FA.
    Sample ID
    Sample identifier in XYY format where X identifies the data series and YY indicates the number in the series. Identical Lab IDs indicates duplicate samples processed by the sediment lab. A forward slash symbol between two sample IDs indicates samples were combined for processing. (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:04/12/2022
    Maximum:06/02/2023
    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 depth relative to the air-water interface or elevation above the bed from which the sample was collected. (Source: Producer defined) Values indicating sampling locations within the water column. Values followed by "mbs" were collected in meters below the surface of the water. Values followed by “mab” were collected in meters above the bed. “Surface” indicates a position in the water column close to the air-water interface where specific depth was not recorded.
    Latitude
    Latitude of sample location in decimal degrees, north. (Source: Producer defined)
    Range of values
    Minimum:37.92245
    Maximum:38.11239
    Units:Decimal degrees
    Longitude
    Longitude of sample location in decimal degrees, east. (Source: Producer defined)
    Range of values
    Minimum:-122.50600
    Maximum:-122.44405
    Units:Decimal degrees
    Method
    Method of sample collection (Source: Producer defined)
    ValueDefinition
    pumpedSamples were collected using a peristaltic pump
    NiskinSamples were collected using a Niskin sampler
    grabSamples were collected using a sample bottle
    Total Depth (m)
    Water depth at time of sampling. "-999" indicates depth was not recorded. (Source: Producer defined)
    Range of values
    Minimum:0.80
    Maximum:3.20
    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
    Aliquot Volume mL
    The volume of sample used for the analysis. “-999” indicates that no value was measured. (Source: producer defined)
    Range of values
    Minimum:35.0
    Maximum:244.0
    Units:milliliters
    Wt. Sediment mg
    The weight of the sediment. “-999” indicates that no value was measured. (Source: producer defined)
    Range of values
    Minimum:1.62
    Maximum:57.30
    Units:milligrams
    Suspended Sediment Concentration mg/L
    The suspended sediment concentration from the sample. “-999” indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:8.55
    Maximum:778.84
    Units:milligram per liter
    Percent_Total_Carbon
    Total weight percentage of total carbon for sample. “-999” indicates that no value was measured. (Source: producer defined)
    Range of values
    Minimum:1.882
    Maximum:2.602
    Units:percentage
    Percent_Total_Organic_Carbon
    Total weight percentage of organic carbon for sample. “-999” indicates that no value was measured. (Source: producer defined)
    Range of values
    Minimum:1.848
    Maximum:2.425
    Units:percentage
    Percent_Total_Inorganic_Carbon
    Total weight percentage of inorganic carbon for sample. “-999” indicates that no value was measured. (Source: producer defined)
    Range of values
    Minimum:0.011
    Maximum:0.177
    Units:percentage
    Percent_Calcium_Carbonate
    Total weight percentage of calcium carbonate (CaCO3) for sample. “-999” indicates that no value was measured. (Source: producer defined)
    Range of values
    Minimum:0.089
    Maximum:1.477
    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
    • 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 and to quantify the carbon content suspended sediment in Corte Madera Marsh tidal creek. These data were collected as part of a study with the goal to produce information useful for prioritizing marsh restoration sites, assessing restoration actions, and understanding mechanisms of sediment delivery to marshes. 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: 02-Jun-2023 (process 1 of 3)
    Water samples were collected periodically between April 2022 and June 2023 using a peristaltic pump, Niskin bottle, or sample bottle. Sampling positions were recorded using a hand-held global navigation satellite system (GNSS) receiver. Samples were placed in cold storage until processed.
    Date: 15-Jun-2023 (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, subsampled volume of sample through a pre-weighed filter, which is then dried and reweighed to determine the mass of suspended sediment on the filter. 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.
    Date: 26-Jan-2023 (process 3 of 3)
    The suspended sediment carbon analysis was performed by the PCMSC sediment and carbon labs employing a coulometric titration technique described in Engleman and others (1985) and UIC operating manuals for the UIC CM5200 autosampler furnace, the UIC CM5230 acidification module, and the UIC CM5017 coulometer. Total carbon (TC), total inorganic carbon (TIC), total organic carbon (TOC) and percent calcium carbonate (CaCO3) are reported as percent dry weight. Approximately 1 liter of the water-sediment samples were centrifuged to remove the water and concentrate the sediment. The sediment was dried and pulverized and ready to be processed for percent carbon analysis. For TC analysis, the dried samples were weighed and wrapped in an aluminum capsule then combusted at 950 degrees Celsius in an UIC CM5200 autosampler furnace attached to an UIC CM5017 coulometer. The carbon dioxide (CO2) produced by combusting the sample was then converted to TC by the UIC CM5017 coulometer. For TIC, the dried samples were weighed and loaded into an UIC CM5230 acidification module attached to an UIC CM5017 coulometer. The samples were then digested in a perchloric acid solution, and the CO2 generated was measured and converted to TIC. Two analyses per sample were run and the results were averaged. TOC was calculated by subtracting TIC from TC. The TIC value was then multiplied by 8.333 (the molar stochiometric ratio of CaCO3 to C) to convert TIC to percent CaCO3.
  3. What similar or related data should the user be aware of?
    Engleman, Edythe E., Jackson, Larry L., and Norton, Daniel R., 1985, Determination of carbonate carbon in geological materials by coulometric titration.

    Online Links:

    Other_Citation_Details:
    Engleman, E.E., Jackson, L.L., and Norton, D.R., 1985, Determination of carbonate carbon in geological materials by coulometric titration: Chemical Geology, v. 53, p. 125-128.

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 value range and have been used to calibrate coincident turbidity measurements in the file: NBM_Turbidity_to_SSC_calibration_constants.csv. This file can be found in the support files for the time series data section of this data release.
  2. How accurate are the geographic locations?
    Horizontal accuracy derived from GPS instrumentation is better than 5 meters (m).
  3. How accurate are the heights or depths?
    No formal positional accuracy tests were conducted. Pumped samples were collected with the intake valve at a fixed height on the sampling frame either resting on the seabed or suspended from the vessel. Samples collected via Niskin and/or grab methods have poorer positional accuracy as the Niskin sampler and bottles used for the grab method have larger diameters, ranging from 10.2 centimeters (cm) to 5.2 cm for the Niskin sampler and grab bottles, respectively.
  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. Specific field notes were retained in the file to support further use of the data.
  5. How consistent are the relationships among the observations, including topology?
    Data values are within the expected values for suspended sediment in bay and tidal creek environments.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints No access constraints
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 (NBM22_SSC_percentcarbon_water_sample_data.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: 0.0335
      Network links: https://doi.org/10.5066/P1XZFGCX
    • Cost to order the data: None.

  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: 06-Aug-2024
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_P1XZFGCX/NBM22_SSC_Carbon_metadata.faq.html>
Generated by mp version 2.9.51 on Thu Aug 15 16:08:33 2024