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    • EK60 Water Column Sonar Data Collected During DY1807

    Metadata Updated: June 9, 2023

    Acoustic-Trawl Survey of Walleye Pollock (Gadus chalcogrammus) on the U.S. Bering Sea shelf (DY1807, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the U.S. Bering Sea shelf (EBS) between Bristol Bay and the U.S.-Russia Convention Line between 6 June and 29 August 2018; the adjoining Russian portion of the EBS shelf was not surveyed. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The survey was conducted in three legs with the vessel departing Dutch Harbor, Alaska on 6 June and the cruise ending in Kodiak, Alaska on 26 August. The vessel departed Dutch Harbor on 6 June to begin leg 1 survey operations and ended leg 1 in Dutch Harbor on 28 June. The vessel departed Dutch Harbor on 1 July for leg 2 with survey operations conducted 3-7 July. A mechanical issue required the vessel to return to Dutch Harbor on 8 July ending leg 2. Following vessel repairs 8-23 July, the vessel departed Dutch Harbor on 25 July with survey operations for leg 3 conducted 25 July to 10 August and returning to Dutch Harbor on 11 August. Leg 3 continued with vessel departure from Dutch Harbor on 14 August and survey conducted 15-20 August. The vessel transited to Kodiak, Alaska 21-25 August and arrived in Kodiak on 26 August. The primary acoustic instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The vessel conducted a pre-cruise acoustic system calibration in Captains Bay, Dutch Harbor, Alaska on 7 June and a post-cruise calibration in Kalsin Bay, Kodiak Island, Alaska on 25 August.

    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 July 19, 2022
    Metadata Created Date November 10, 2022
    Metadata Updated Date June 9, 2023
    Reference Date(s) June 6, 2018 (creation), May 30, 2019 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date July 19, 2022
    Metadata Created Date November 10, 2022
    Metadata Updated Date June 9, 2023
    Reference Date(s) June 6, 2018 (creation), May 30, 2019 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei.wcd:DY1807_EK60
    Access Constraints Cite as: NOAA Alaska Fisheries Science Center. 2018. 'EK60 Water Column Sonar Data Collected During DY1807'. NOAA National Centers for Environmental Information. https://doi.org/10.25921/mb6p-8b53 [access date], Resource may not be available for up to one year after initial collection., 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.
    Bbox East Long -151.99832
    Bbox North Lat 63.00567
    Bbox South Lat 53.84462
    Bbox West Long -177.17585
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 0e3fc42e-1755-471d-8c90-560cb48ee5ab
    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 Calibrated w/ calibration data
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-177.17585, 53.84462], [-151.99832, 53.84462], [-151.99832, 63.00567], [-177.17585, 63.00567], [-177.17585, 53.84462]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2018-06-06T15:25:02
    Temporal Extent End 2018-08-26T04:50:37

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