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    • EK80 Water Column Sonar Data Collected During DP10

    Metadata Updated: January 1, 2026

    Patterns in acoustically derived biological scatter through the water column was collected with multi-frequency scientific echosounders (Simrad EK80) operating at 18kHz and 38kHz following protocols developed during the NOAA NRDA DAP data collection operations. Specifically, during each cruise, transducers were installed on a rigid pole mounted to the side of the ship, and calibrated at sea for operating conditions following protocols developed during the ONSAP/DAP cruises. The dynamics of the mesopelagic scattering community were examined through the depth dependent scattering responses at both frequencies (18 and 38kHz) as well as through the difference between the mean volume backscattering strength (MVBS; in dB) at 18 kHz and 38 kHz (dMVBS(18-38)). In addition, scatterers in the upper water column (~150m) were examined by analyzing the available frequencies.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date December 5, 2025
    Metadata Created Date January 1, 2026
    Metadata Updated Date January 1, 2026
    Reference Date(s) April 23, 2023 (creation), December 5, 2025 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date December 5, 2025
    Metadata Created Date January 1, 2026
    Metadata Updated Date January 1, 2026
    Reference Date(s) April 23, 2023 (creation), December 5, 2025 (publication)
    Responsible Party (Point of Contact); NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:DP10_EK80
    Access Constraints Cite as: Florida International University. 2025. EK80 Water Column Sonar Data Collected During DP10. NOAA National Centers for Environmental Information. https://doi.org/10.25921/2qt3-0a02 [access date], Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose, Resource may not be available for up to one year after initial collection.
    Bbox East Long -87.33679
    Bbox North Lat 29.33097
    Bbox South Lat 27.45082
    Bbox West Long -88.06703
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id e75c6065-9403-4dcc-a3d6-ab394906a6c0
    Harvest Source Id ab8b0290-e4db-4a00-89f2-4e427c2054b2
    Harvest Source Title NGDC MGG Sonar Water Column
    Licence These data are considered raw and have not been subjected to the NOAA's quality control or quality assurance procedures. They are released for limited public use as preliminary data to be used only with appropriate caution. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty., Not subject to copyright protection within the United States.
    Lineage Uncalibrated w/ calibration data
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-88.06703, 27.45082], [-87.33679, 27.45082], [-87.33679, 29.33097], [-88.06703, 29.33097], [-88.06703, 27.45082]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2023-04-23T00:00:00
    Temporal Extent End 2025-05-02T11:59:59

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