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EK80 Water Column Sonar Data Collected During DY2204

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC), conducted an acoustic-trawl (AT) stock assessment survey in the Shelikof Strait area of the Gulf of Alaska (GOA) in the late winter of 2022 to estimate distribution and abundance of walleye pollock (Gadus chalcogrammus). This survey was conducted aboard NOAA Ship Oscar Dyson (built in 2003, 64 meters, 2500 tons, 3100 hp), a research stern trawler equipped with acoustic and oceanographic instrumentation. The primary water column acoustic instrument for the survey was a Kongsberg EK80 split-beam scientific echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The vessel departed Kodiak, Alaska on 8 March and conducted the Shelikof Strait survey 9-16 March. A calibration of the EK80 echosounder system was conducted prior to starting the survey on 8 March in Kalsin Bay, Kodiak Island, Alaska. Trawl operations were conducted using an LFS1421 mid-water trawl net.
  • Cite as: NOAA Alaska Fisheries Science Center. 2024. EK80 Water Column Sonar Data Collected During DY2204. NOAA National Centers for Environmental Information. https://doi.org/10.25921/kats-zp67 [access date]
gov.noaa.ncei:DY2204_EK80
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Search Data
Download Data
  • AWS Cloud Storage Bucket (download)
    AWS Cloud Storage to provide additional public access to water column sonar data through the NOAA Open Data Dissemination project (NODD)
Distribution Formats
  • EK80 (Version:1)
    • File Specification: Simrad EK80 raw files. See the Simrad EK80 interface specification manual for additional information.
Ordering Instructions Contact the NCEI Water Column Sonar Data Manager to order data.
Distributor NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Dataset Point of Contact Water Column Sonar Data Manager
NOAA National Centers for Environmental Information
(303) 497-4742
wcd.info@noaa.gov
Time Period 2022-03-08T00:00:00 to 2022-03-17T11:59:59
Spatial Reference System urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown
Spatial Bounding Box Coordinates
West:-156.96063
East:-151.53518
South:55.68815
North:58.73812
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2022-03-08
    • publication: 2024-03-01
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose NOAA Fisheries/Alaska Fisheries Science Center (AFSC) acoustic-trawl (AT) stock assessment survey of walleye pollock (Gadus chalcogrammus) in the Shelikof Strait area of the Gulf of Alaska (GOA) 9-16 March 2022 aboard NOAA Ship Oscar Dyson.
    Use Limitations
    • 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.
    Dataset Citation
    • Cite as: NOAA Alaska Fisheries Science Center. 2024. EK80 Water Column Sonar Data Collected During DY2204. NOAA National Centers for Environmental Information. https://doi.org/10.25921/kats-zp67 [access date]
    Cited Authors
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Principal Investigators
    • Sandy Parker-Stetter
      NWFSC/FRAM/FEAT
    Custodians
    • NOAA National Centers for Environmental Information
    Publishers
    • NOAA National Centers for Environmental Information
    Theme keywords Global Change Master Directory (GCMD) Science Keywords
    • Earth Science > Oceans > Ocean Acoustics > Acoustic Scattering
    • Earth Science > Oceans > Aquatic Sciences > Fisheries
    • Earth Science > Oceans > Ocean Acoustics
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Pelagic
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
    • Earth Science > Biosphere > Ecosystems > Aquatic Ecosystems
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
    Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Instrument keywords Global Change Master Directory (GCMD) Instrument Keywords
    • In Situ/Laboratory Instruments > Profilers/Sounders > Acoustic Sounders > WCMS > Water Column Mapping System
    Place keywords International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
    • Gulf of Alaska
    Global Change Master Directory (GCMD) Location Keywords
    • Vertical Location > Water Column
    Use Constraints
    • Cite as: NOAA Alaska Fisheries Science Center. 2024. EK80 Water Column Sonar Data Collected During DY2204. NOAA National Centers for Environmental Information. https://doi.org/10.25921/kats-zp67 [access date]
    • 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.
    Access Constraints
    • 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.
    • Resource may not be available for up to one year after initial collection.
    Fees
    • Free
    Lineage information for:series
    Processor
    • NWFSC/FRAM/FEAT
    Lineage information for:series
    Lineage Statement The EK80 echosounder system installed on the Dyson utilizes six frequencies: 18, 38, 70, 120, 200, and 333 kHz split-beam transceivers and transducers. The 333 kHz system had high levels of noise that impaired its functionality; it was not calibrated or used during the survey. The EK80 echosounder system transducers installed on NOAA Ship Oscar Dyson are mounted in a deployable centerboard. The transducer draft settings in the EK80 software are nominally correct when the centerboard is fully extended (draft correction setting is 9.15 meters below the surface). When the centerboard is in the retracted position (transducers approximately even with the vessel's keel), the transducers are nominally 5.3 meters below the surface. The EK80 system was calibrated at the start of the 2022 winter field season on 30 January, 2022 near Port Madison, Washington, and at the start of the survey on 8 March, 2022 in Kalsin Bay, Kodiak Island; no post-cruise calibration was conducted. EK80 data collected during the Kalsin Bay calibration have been included with the standard survey data. The 18 kHz EK80 echosounder system was calibrated using a 64 mm copper sphere suspended below the centerboard-mounted transducer; the 38, 70, 120, and 200 kHz echosounder systems were calibrated with a 38.1 mm tungsten carbide sphere. During calibration, the vessel?s dynamic positioning system maintained the vessel position. Local water temperature and salinity were measured and used to estimate absorption and sound speed. EK80 broadband data was collected for comparison with EK80 narrowband data. These data were not used as part of the stock abundance survey but have been included with this data package.
    Acquisition Information (collection)
    Instrument
    • Simrad EK80
    • Simrad ME70
    • Simrad EK60
    • Simrad ES60
    • Knudsen CHIRP 3260
    • Sippican XBT/XSV
    • SBE 49 FastCAT
    • SBE 911plus CTD
    • SBE 32
    • POS/MV 320
    Platform
    • Oscar Dyson (DY)
    Operation
    • DY2204_EK80
    Last Modified: 2024-03-01
    For questions about the information on this page, please email:ncei.info@noaa.gov