CTD profile measurements collected off California and Oregon during NOAA cruise SH-18-12 (USGS field activity 2018-663-FA) from October to November 2018

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Frequently anticipated questions:

What does this data set describe?

Title:
CTD profile measurements collected off California and Oregon during NOAA cruise SH-18-12 (USGS field activity 2018-663-FA) from October to November 2018
Abstract:
CTD (Conductivity Temperature Depth) data were collected offshore of California and Oregon from October to November 2018 during NOAA cruise SH-18-12 on the R/V Bell M. Shimada (USGS field activity 2018-663-FA).
This data release supersedes version 2.0, published in September 2021 at https://doi.org/10.5066/P99DIQZ5. Versioning details are documented in the accompanying VersionHistory_P99MJ096.txt file.
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=2018-663-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., 20200626, CTD profile measurements collected off California and Oregon during NOAA cruise SH-18-12 (USGS field activity 2018-663-FA) from October to November 2018: data release DOI:10.5066/P99MJ096, 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., and Baker, Miranda C., 2020, CTD profiles and discrete water-column measurements collected off California and Oregon during NOAA cruise SH-18-12 (USGS field activity 2018-663-FA) from October to November 2018 (ver. 3.0, July 2022): data release DOI:10.5066/P99MJ096, 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: -124.915167
    East_Bounding_Coordinate: -119.345333
    North_Bounding_Coordinate: 44.665333
    South_Bounding_Coordinate: 33.130000
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 12-Oct-2018
    Ending_Date: 07-Nov-2018
    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 NetCDF 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 0.0001. Longitudes are given to the nearest 0.0001. 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 temperature, conductivity, pressure, oxygen, turbidity, fluorescence, altimeter, salinity, depth and an empty flag. (Source: Producer defined.)
    timeJ
    Julian Days (Source: Producer defined.)
    Range of values
    Minimum:285.461829
    Maximum:311.247423
    Units:Julian Days
    Resolution:0.000001
    t090C
    Temperature [ITS-90, deg C] (Source: Producer defined.)
    Range of values
    Minimum:5.0311
    Maximum:19.4201
    Units:degrees Celsius
    Resolution:0.0001
    c0uS/cm
    Conductivity (Source: Producer defined.)
    Range of values
    Minimum:33132
    Maximum:45792
    Units:microsiemens per centimeter
    Resolution:1
    prDM
    Pressure, Digiquartz [db] (Source: Producer defined.)
    Range of values
    Minimum:0.687
    Maximum:617.696
    Units:decibels
    Resolution:0.001
    sbeoxOMg/L
    Oxygen, SBE 43 [mg/l] (Source: Producer defined.)
    Range of values
    Minimum:0.396
    Maximum:8.8902
    Units:milligrams per liter
    Resolution:0.0001
    sbeox0PS
    Oxygen, SBE 43 [% saturation] (Source: Producer defined.)
    Range of values
    Minimum:3.905
    Maximum:106.141
    Units:percentage saturation
    Resolution:0.001
    turbWETntu0
    Turbidity, WET Labs ECO [NTU] (Source: Producer defined.)
    Range of values
    Minimum:-0.0137
    Maximum:1.4942
    Units:NephelometricÊTurbidityÊUnits
    Resolution:0.0001
    flECO-AFL
    Fluorescence, WET Labs ECO-AFL/FL [mg/m^3] (Source: Producer defined.)
    Range of values
    Minimum:-0.0641
    Maximum:4.3925
    Units:miligrams per cubic meter
    Resolution:0.0001
    altM
    Altimeter [m] (Source: Producer defined.)
    Range of values
    Minimum:0.00
    Maximum:100.00
    Units:meters
    Resolution:0.01
    sal00
    Salinity, Practical [PSU] (Source: Producer defined.)
    Range of values
    Minimum:32.2538
    Maximum:34.3309
    Units:practical salinity units (PSU)
    Resolution:0.001
    depSM
    Depth [salt water, m] (Source: Producer defined.)
    Range of values
    Minimum:0.682
    Maximum:612.125
    Units:meters
    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?
    Joanne Ferreira, U.S. Geological Survey
  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?

These data were collected as part of the on-going Expanding Pacific Research and Exploration of Submerged Systems (EXPRESS) project, a multi-year, multi-institution cooperative research campaign in deep sea areas of California, Oregon, and Washington, including the continental shelf and slope. EXPRESS data and information are intended to guide wise use of living marine resources and habitats, inform ocean energy and mineral resource decisions, and improve offshore hazard assessments. The ultimate goal of EXPRESS is to develop comprehensive digital elevation models, habitat maps, and geologic maps, which are needed to address important issues associated with marine spatial planning, ecosystem assessments, geohazards, and the impact on sensitive ecosystems of offshore infrastructure development. This particular NOAA cruise focused on deep-sea corals, sponges, and associated habitats.

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: 07-Nov-2018 (process 1 of 2)
    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 (SH for Shimada). The second element is the year of the field activity; the third element the cruise number of the vessel.
    Date: 13-Jun-2022 (process 2 of 2)
    This data release supersedes version 2.0, published in September 2021 at https://doi.org/10.5066/P99DIQZ5. Versioning details are documented in the accompanying VersionHistory_P99MJ096.txt file. For the revision, this particular metadata file was updated to reflect the new doi number, URLs, download links, and updated PID. No data value changes from ver. 2.0 to ver. 3.0 were made to the CTD data file (SH-18-12_raw_CTD.zip). The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent.
  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; MX420 DGPS (Differential GPSP) 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 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, Bureau of Ocean Energy Management (BOEM), and the National Oceanic and Atmospheric Administration (NOAA) 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 (e.g., CTD002SH-18-12.cnv) contained in single zip file (SH-18-12_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: 13-Jul-2022
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_P99MJ096/SH-18-12_raw_CTD_metadata.faq.html>
Generated by mp version 2.9.51 on Thu Jul 14 17:14:01 2022