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    • EK80 Water Column Sonar Data Collected During DAFT6-C4-201801 Deployment

    Metadata Updated: November 10, 2022

    A bottom moored echosounder was deployed at 44.4 m depth in the NE Chukchi Sea (71.038186N, 160.503545W) from 15 August 2018 to 03 September 2019. The mooring was instrumented with a battery powered EK80 wideband autonomous transceiver (WBAT, Simrad AS). The echosounder operated an upwards facing depth-rated 70 kHz 18° split-beam transducer (ES70-18CD), positioned upward with a two-axis gimbal equipped with a 0.7 kg counterweight. The echosounder also operated a combined 38 kHz 18° split-beam and 200 kHz 18° single-beam (ES38-18/200-18C) mounted at a fixed position. Both transducer faces were positioned at a height of 0.8 m above the seafloor. During the deployment, the WBAT was programmed to transmit an ensemble of 300 narrowband (200 pings at 70 kHz, 100 pings at 38 and 200 kHz) and 50 wideband (25 pings at 70 kHz, 25 pings at 38 and 200 kHz) every two hours. Data were recorded to a range of 60 m. Echosounders were calibrated in Seattle, Washington after instrument recovery using a 38.1-mm tungsten carbide sphere following the standard sphere method (Demer et al., 2015).

    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.

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    Dates

    Metadata Date March 5, 2022
    Metadata Created Date November 10, 2022
    Metadata Updated Date November 10, 2022
    Reference Date(s) August 15, 2018 (creation), March 5, 2022 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date March 5, 2022
    Metadata Created Date November 10, 2022
    Metadata Updated Date November 10, 2022
    Reference Date(s) August 15, 2018 (creation), March 5, 2022 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:DAFT6-C4-201801_EK80
    Access Constraints Cite as: NOAA Alaska Fisheries Science Center. 2022. EK80 Water Column Sonar Data Collected During DAFT6-C4-201801 Deployment. NOAA National Centers for Environmental Information. https://doi.org/10.25921/f3a7-ee94 [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 -160.503545
    Bbox North Lat 71.038186
    Bbox South Lat 71.038186
    Bbox West Long -160.503545
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 7aa5f12a-b8e1-45d8-b480-1b997c2a53df
    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": "Point", "coordinates": [-160.503545, 71.038186]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2018-08-15T00:00:00
    Temporal Extent End 2019-09-03T11:59:59

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