Porewater chloride and sulfate concentrations from piston and gravity cores collected in September 2019 offshore of south-central California (USGS FAN 2019-642-FA)

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Frequently anticipated questions:

What does this data set describe?

Title:
Porewater chloride and sulfate concentrations from piston and gravity cores collected in September 2019 offshore of south-central California (USGS FAN 2019-642-FA)
Abstract:
This dataset includes concentrations chloride and sulfate in porewater from piston and gravity cores collected in September 2019 offshore of south-central California aboard the R/V Bold Horizon. This dataset is one of several collected as part of the Bureau of Ocean Energy Management (BOEM)-funded California Deepwater Investigations and Groundtruthing (Cal DIG I) project. The purpose of the study is to assess shallow geohazards, benthic habitats, and thereby the potential for alternative energy infrastructure (namely floating wind turbines) offshore south-central California due to its proximity to power grid infrastructure associated with the Morro Bay power plant. These core data provide information about the geology of the seafloor and shallow subsurface offshore of the south-central California coast.
Supplemental_Information:
Additional information about the USGS field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-642-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Kennedy, Daniel J., Walton, Maureen A., Cochrane, Guy R., Paull, Charlie, Gwiazda, Roberto, Lorenson, Thomas D., Addison, Jason A., and Lundsten, Eve, 20211016, Porewater chloride and sulfate concentrations from piston and gravity cores collected in September 2019 offshore of south-central California (USGS FAN 2019-642-FA): data release DOI:10.5066/P9DE639J, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Kennedy, Daniel J., Walton, Maureen A., Cochrane, Guy R., Paull, Charlie, Gwiazda, Roberto, Lorenson, Thomas D., Addison, Jason A., and Lundsten, Eve, 2021, Piston and gravity core data collected during USGS cruise 2019-642-FA offshore of south-central California in support of the Bureau of Ocean Energy Management (BOEM) California Deepwater Investigations and Groundtruthing (Cal DIG I) alternative energy project, September 2019: data release DOI:10.5066/P9DE639J, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -121.106945
    East_Bounding_Coordinate: -121.869382
    North_Bounding_Coordinate: 35.782235
    South_Bounding_Coordinate: 34.535102
  3. What does it look like?
    2019-642-FA_core_thumbnail.png (png)
    Bathymetry map of study area with sample sites in purple
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 27-Sep-2019
    Currentness_Reference:
    ground condition at the time the samples were collected
  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?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (324)
    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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1927
      Altitude_Resolution: 0.1
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    2019-642-FA_porewater.csv
    Porewater data spreadsheet (Source: Producer defined)
    Core
    Core sample from which porewater was sampled (Source: Monterey Bay Aquarium Research Institute (MBARI)) Unique identifier for the core sample given in the field, where GC=gravity core and JPC=jumbo piston core
    Depth cm
    Depth from top of core at which the porewater was sampled (Source: Monterey Bay Aquarium Research Institute (MBARI))
    Range of values
    Minimum:30
    Maximum:717
    Units:cm
    Resolution:0.1
    Porewater Chloride millimolar
    Chloride concentration per core segment (Source: Monterey Bay Aquarium Research Institute (MBARI))
    Range of values
    Minimum:514.6
    Maximum:564.5
    Units:g/mMa
    Resolution:0.1
    Porewater Sulfate millimolar
    Sulfate concentration per core segment (Source: Monterey Bay Aquarium Research Institute (MBARI))
    Range of values
    Minimum:0
    Maximum:28.6
    Units:g/mMa
    Resolution:0.1
    Entity_and_Attribute_Overview: The first line of the csv file is a header line.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Daniel J. Kennedy
    • Maureen A. Walton
    • Guy R. Cochrane
    • Charlie Paull
    • Roberto Gwiazda
    • Thomas D. Lorenson
    • Jason A. Addison
    • Eve Lundsten
  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

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

Why was the data set created?

This dataset was collected in order to identify shallow geohazards, benthic habitats, and thereby the potential for alternative energy infrastructure (namely floating wind turbines) offshore south-central California due to its proximity to power grid infrastructure associated with the Morro Bay power plant.

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: 27-Sep-2019 (process 1 of 2)
    Piston and gravity cores were collected at sea aboard the R/V Bold Horizon on U.S. Geological Survey (USGS) cruise 2019-642-FA in conjunction with the Monterey Bay Aquarium Research Institute (MBARI).
    Date: 20-Mar-2020 (process 2 of 2)
    Porewater samples were collected at intervals throughout each core using porous ceramic tubes connected to an evacuated small volume syringe at one end and inserted into the cores at the other end to extract pore waters through vacuum action. Porewater samples were filtered through 0.22-µmfilters, diluted 1:100, and injected into a Dionex DX-120 ion chromatograph. Bracketing standards were run every five samples. Long-term reproducibility of Cl concentration measurements is 3.2% (2s). Person who carried out this activity:
    Roberto Gwiazda
    Monterey Bay Aquarium Research Institute (MBARI)
    Research Specialist
    7700 Sandholdt Road
    Moss Landing, CA

    831-775-1828 (voice)
    rgwiazda@mbari.org
  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?
    The locations of samples were determined using the Bold Horizon's internal Yonav navigation system, no other formal positional accuracy tests were conducted.
  3. How accurate are the heights or depths?
    No vertical 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

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
    Attn: PCMSC Science Data Coordinator
    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? 2019-642-FA_porewater.csv containing Chloride and Sulfate porewater concentrations. The data are divided up and presented by core sample, as reflected in the individual file name(s).
  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: 2019-642-FA_porewater.csv containing Chloride and Sulfate porewater concentrations. The data are divided up and presented by core sample, as reflected in the individual file name(s). in format comma-delimited text (version NA) Size: 0.007
      Network links: https://doi.org/10.5066/P9DE639J
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with Excel or any text-reading software.

Who wrote the metadata?

Dates:
Last modified: 16-Oct-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

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_P9DE639J/2019-642-FA_porewater_metadata.faq.html>
Generated by mp version 2.9.50 on Mon Oct 18 16:19:50 2021