Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (OD0501, EK60)

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey of walleye pollock (Theraga Chalcogramma) along sections of the Gulf of Alaska shelf and shelfbreak from the Islands of Four Mountains to south of Prince William Sound, 30 June to 30 July 2005. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation, utilizing a Simrad EK60 split-beam echosounder system. The vessel departed Kodiak, Alaska on 2 July and arrived in Kodiak on 29 July. The cruise was completed in two legs with a port call in Dutch Harbor, Alaska 12-13 July. The EK60 echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska on 2 June, and at the end of the cruise in Three Saints Bay on 28 July 2005.
  • Cite as: Alaska Fisheries Science Center (2005): Water Column Sonar Data Collection (OD0501, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V52805QZ [access date]
gov.noaa.ngdc.mgg.wcd:OD0501_EK60
Search Data
Distribution Formats
  • Simrad EK60 raw (.raw) format (Version: 1)
    • File Specification: Simrad EK60 raw files. See the Simrad EK60 interface specification manual for additional information.
Ordering Instructions Contact the NCEI Water Column Sonar Data Manager to order data
Distributor Chuck Anderson
Water Column Sonar Data Manager
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
(303) 497-4742
wcd.info@noaa.gov
Dataset Principal Investigator Chris Wilson
Supervisory Research Fish Biologist
DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
(206) 526-6435
chris.wilson@noaa.gov
Time Period 2005-06-01T16:08:17 to 2005-07-28T21:21:34
Spatial Reference System urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates
N: 59.15755
S: 0.0
E: 0.0
W: -170.04038
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2005-06-01
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose Acoustic-trawl (AT) survey of walleye pollock (Theragra chalcogramma) on the Gulf of Alaska shelf and shelfbreak, 30 June to 30 July 2005
    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.
    Dataset Citation
    • Cite as: Alaska Fisheries Science Center (2005): Water Column Sonar Data Collection (OD0501, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V52805QZ [access date]
    Resource Providers
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Points of Contact
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Publishers
      Publisher information not available.
    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
    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
    • Global
    • Vertical Location > Sea Floor
    Keywords
      Use Constraints
      • Cite as: Alaska Fisheries Science Center (2005): Water Column Sonar Data Collection (OD0501, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V52805QZ [access date]
      Access Constraints
      • Resource may not be available for up to one year after initial collection.
      Fees
      • Free
      Lineage information for: collectionHardware
      Lineage Statement Calibrated w/o calibration data
      Lineage information for: series
      Processor
      • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
      Lineage information for: series
      Lineage Statement The primary instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing four frequencies (18, 38, 120, and 200 kHz). The EK60 38, 120 and 200 kHz transducers installed on the Oscar Dyson are mounted on a deployable centerboard. The transducer draft settings in the EK60 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 flush with the vessel's keel), the transducers are nominally 6.1 meters below the surface. The 18 kHz transducer was mounted on the ship's hull approximately 10 meters forward of the ship's centerboard and approximately 1.5 meters to the port side of the ship's centerline with a nominal draft of 4.96 meters. The echosounder system was calibrated at the start (2 June) and end (28 July) of the of the cruise in Three Saints Bay, Kodiak Island, Alaska.
      Acquisition Information (collection)
      Instrument
      • SBE 49 FastCAT
      • SBE 911plus CTD
      • SBE 32
      Platform
      • Oscar Dyson (DY)
      Operation
      • OD0501_EK60
      Last Modified: 2017-05-31
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