Gulf of Alaska Acoustic-Trawl Surveys of Walleye Pollock (DY1002, EK60)

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment surveys in the Gulf of Alaska (GOA) during the late winter/early spring of 2010 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The vessel departed Kodiak, Alaska on 18 March and conducted a survey along the central Gulf of Alaska shelf east of Chirikof Island 18-19 March. The vessel conducted fisheries research operations on Snakehead shelf 19-22 March. The vessel then surveyed Shelikof Strait 22-28 March and returned to Kodiak, Alaska on 30 March following a post-cruise EK60 echosounder system calibration 29-30 March. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.
  • Cite as: Alaska Fisheries Science Center (2010): Water Column Sonar Data Collection (DY1002, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5QJ7F96 [access date]
gov.noaa.ngdc.mgg.wcd:DY1002_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 Distributor information not available
Dataset No POCs available for this dataset
Time Period 2010-03-18T02:30:08 to 2010-03-30T15:06:04
Spatial Bounding Box Coordinates
N: 58.74647
S: 55.52075
E: -151.86566
W: -157.0034
Spatial Coverage Map
Documentation links not available.
Publication Dates
  • creation: 2010-03-18
Dataset Progress Status Complete - production of the data has been completed
Data Update Frequency Not planned
Purpose Acoustic-trawl (AT) surveys of walleye pollock (Theragra chalcogramma) along the Chirikof shelf break and Shelikof Strait areas of the Gulf of Alaska, 18-30 March 2010
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: Alaska Fisheries Science Center (2010): Water Column Sonar Data Collection (DY1002, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5QJ7F96 [access date]
Custodians
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Resource Providers
  • Dataset contact information not available
Publishers
    Publisher information not available.
Theme 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
  • 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
  • GEOGRAPHIC REGION > GLOBAL
  • Vertical Location > VERTICAL LOCATION > SEA FLOOR
Keywords
    Use Constraints
    • Cite as: Alaska Fisheries Science Center (2010): Water Column Sonar Data Collection (DY1002, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5QJ7F96 [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
    Lineage information for: series
    Lineage Statement The primary instrumentation for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The EK60 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 EK60 system was calibrated prior to the start of the cruise on 22 February 2010 in Three Saints Bay, Kodiak Island, Alaska and at the end of the cruise also in Three Saints Bay on 29 March 2010.
    Acquisition Information (collection)
    Instrument
    • Simrad ME70
    • Simrad EK60
    • Simrad ES60
    • Knudsen CHIRP 3260
    • SBE 49 FastCAT
    • SBE 911plus CTD
    • SBE 32
    • POS/MV 320
    Platform
    • Oscar Dyson (DY)
    Operation
    • DY1002_EK60
    Last Modified: 2017-05-30
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