CTD profile measurements collected along the Cascadia margin for the FK190612 expedition in June 2019

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Frequently anticipated questions:

What does this data set describe?

Title:
CTD profile measurements collected along the Cascadia margin for the FK190612 expedition in June 2019
Abstract:
CTD (Conductivity Temperature Depth) data were collected along the Cascadia margin for the FK190612 expedition in June 2019
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-619-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?
    Baker, Miranda C., and Prouty, Nancy G., 20241121, CTD profile measurements collected along the Cascadia margin for the FK190612 expedition in June 2019: data release DOI: 10.5066/P1VR2IYU, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Prouty, Nancy G., Baker, Miranda C., and Campbell, Pamela L., 2024, Geochemical analysis of authigenic carbonates, water column, and pore fluids measurements collected on the FK190612 research expedition in the north Pacific Ocean along the Cascadia margin in June 2019.: data release 10.5066/P1VR2IYU, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Prouty, N.G., Baker, M.C., and Campbell, P.L., 2024, Geochemical analysis of authigenic carbonates, water column, and pore fluids measurements collected on the FK190612 research expedition in the north Pacific Ocean along the Cascadia margin in June 2019: U.S. Geological Survey data release, https://doi.org/10.5066/P1VR2IYU.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -125.17578
    East_Bounding_Coordinate: -124.64324
    North_Bounding_Coordinate: 46.96101
    South_Bounding_Coordinate: 43.02029
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 16-Jun-2019
    Ending_Date: 02-Jul-2019
    Currentness_Reference:
    Ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tab-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 continuously along survey transects. Refer to self-contained ASCII files for more location information.
    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 0.001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is D_WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    .cnv ASCII text file with self-contained header information. End of header of indicated by *END*.
    Output text file from Sea-Bird SBE 9 containing data points from CTD water column profiles with depth, temperature, turbidity, salinity, oxygen, conductivity, beam transmission, beam attenuation, altimeter, bottles fired, density, pressure, and an empty flag. Latitude and longitude values ae included for CTD casts 10-15. (Source: Producer defined.)
    depSM
    Depth [saltwater, m] (Source: Producer defined.)
    Range of values
    Minimum:-0.814
    Maximum:1349.304
    Units:meters
    Resolution:0.001
    t090C
    Temperature [ITS-90, deg C] (Source: Producer defined.)
    Range of values
    Minimum:2.7642
    Maximum:16.4608
    Units:degrees Celsius
    Resolution:0.0001
    t190C
    Temperature, 2[ITS-90, deg C] (Source: Producer defined.)
    Range of values
    Minimum:2.7646
    Maximum:16.4593
    Units:degrees Celsius
    Resolution:0.0001
    turbWETntu0
    Turbidity, WET Labs ECO [NTU] (Source: Producer defined.)
    Range of values
    Minimum:0.0802
    Maximum:24.72
    Units:Nephelometric Turbidity Units
    Resolution:0.0001
    sal00
    Salinity, Practical [PSU] (Source: Producer defined.)
    Range of values
    Minimum:3.2249
    Maximum:34.523
    Units:practical salinity units (PSU)
    Resolution:0.0001
    sal11
    Salinity, Practical 2 [PSU] (Source: Producer defined.)
    Range of values
    Minimum:2.581
    Maximum:34.5153
    Units:practical salinity units (PSU)
    Resolution:0.0001
    sbeox0Mm/L
    Oxygen, SBE 43 [umol/l] (Source: Producer defined.)
    Range of values
    Minimum:6.758
    Maximum:434.584
    Units:micromolar per liter
    Resolution:0.001
    sbeox0Mm/L
    Oxygen, SBE 43, 2 [umol/l] (Source: Producer defined.)
    Range of values
    Minimum:7.895
    Maximum:409.041
    Units:micromolar per liter
    Resolution:0.001
    c0S/m
    Conductivity (Source: Producer defined.)
    Range of values
    Minimum:0.487589
    Maximum:4.109972
    Units:Siemens per meter
    Resolution:0.000001
    c1S/m
    Conductivity (Source: Producer defined.)
    Range of values
    Minimum:0.39811
    Maximum:4.109206
    Units:Siemens per meter
    Resolution:0.000001
    CStarTr0
    Beam Transmission, WET Labs C-Star [percent] (Source: Producer defined.)
    Range of values
    Minimum:17.9462
    Maximum:99.4156
    Units:percentage
    Resolution:0.0001
    CStarAt0
    Beam Attenuation, WET Labs C-Star [1/m] (Source: Producer defined.)
    Range of values
    Minimum:0.0234
    Maximum:6.8712
    Units:percentage
    Resolution:0.0001
    altM
    Altimeter [m] (Source: Producer defined.)
    Range of values
    Minimum:0
    Maximum:100
    Units:meters
    Resolution:0.01
    nbf
    Bottles Fired (Source: Producer defined.)
    Range of values
    Minimum:0
    Maximum:24
    Units:unitless
    density00
    Density [density, kg/m^3] (Source: Producer defined.)
    Range of values
    Minimum:1001.445
    Maximum:1033.813
    Units:kilograms per cubic meter
    Resolution:0.0001
    density11
    Density, 2 [density, kg/m^3] (Source: Producer defined.)
    Range of values
    Minimum:1000.904
    Maximum:1033.813
    Units:kilograms per cubic meter
    Resolution:0.0001
    prDM
    Pressure, Digiquartz [db] (Source: Producer defined.)
    Range of values
    Minimum:-0.848
    Maximum:1364.924
    Units:decibels
    Resolution:0.001
    latitude
    Latitude [deg] (Source: Producer defined.)
    Range of values
    Minimum:45.84804
    Maximum:46.95998
    Units:decimal degrees
    Resolution:0.00001
    Longitude
    Longitude [deg] (Source: Producer defined.)
    Range of values
    Minimum:-125.176
    Maximum:-124.643
    Units:degrees
    Resolution:0.001
    flag
    empty flag (Source: Producer defined)
    ValueDefinition
    0.000e+00empty flag
    Entity_and_Attribute_Overview:
    Header of file includes additional metadata information. End of header indicated by *END*.
    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)
    • Miranda C. Baker
    • Nancy G. Prouty
  2. Who also contributed to the data set?
    Schmidt Ocean Institute (SOI)
  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

    831-430-4726 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

CTD data was collected on the FK190612 research expedition in the north Pacific Ocean along the Cascadia margin in June 2019 as part of a research expedition to examine characteristics of methane emissions from seafloor seeps at the edge of hydrate stability and the associated communities.

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: 2021 (process 1 of 1)
    Conductivity, salinity, and depth (CTD) data were collected with a SeaBird SBE-9 CTD Profile. Data were accumulated into .cnv tab-delimited ASCII text files. Data collected when instruments were out of the water were removed during post-processing. Files are named with a convention that uses a multi-element alphanumeric code delimited by dashes. The first element of this dataset consists of the instrument deployed CTD followed by the number indicating the cast and then the abbreviation for the research vessel (FK Falkor). The second element is the year of the field activity; the third element the cruise number of the vessel.
  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?
    The CTD was calibrated according to the Sea-Bird user manual.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The horizontal accuracy is based on ship’s position using the navigations system; Global Navigation Satellite System (GNSS) called CNAV with an accuracy of 1 m.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Depth was determined using a SeaBird CTD digiquartz pressure sensor with a stated accuracy of 0.015 percent.
  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 metadata for each part of this data release 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 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 and Schmidt Ocean Instituted (SOI) as the originators 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
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    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 .cnv tab-delimited ASCII text files (for example, FK190612_CTD001_16062019.cnv) contained in single zip file (FK190612_raw_CTD). Each file contains the water column data for an individual CTD cast.
  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?
    These data can be viewed with any text editor software.

Who wrote the metadata?

Dates:
Last modified: 21-Nov-2024
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/ScienceBase/DR_P1VR2IYU/FK190612_CTD_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Nov 22 11:55:24 2024