Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1302, 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 winter of 2013 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The vessel departed Kodiak, Alaska on 7 February, conducted EK60 echosounder system calibration on 9 February, then returned to Kodiak due to vessel mechanical issues on 12 February. The vessel departed Kodiak on 24 February following repairs, arriving at the start of the first survey on 26 February. The Shumagin Islands survey was conducted 26 February to 1 March and included Shumagin Trough, Stepovak Bay, Renshaw Point, Unga Strait, and West Nagai Strait. The Sanak Trough survey was conducted on 2 March, followed by the Morzhovoi Bay survey on 3 March; the vessel arrived in Kodiak on 4 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 (2013): Water Column Sonar Data Collection (DY1302, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V59Z92WF [access date]
gov.noaa.ngdc.mgg.wcd:DY1302_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 No POCs available for this dataset
Time Period 2013-02-07T19:05:03 to 2013-03-05T03:47:48
Spatial Reference System urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates
N: 58.01631
S: 54.44067
E: -152.02608
W: -163.30879
Spatial Coverage Map
Documentation links not available.
Publication Dates
  • creation: 2013-02-07
Dataset Progress Status Complete - production of the data has been completed
Data Update Frequency Not planned
Purpose Acoustic-trawl (AT) surveys of walleye pollock (Gadus chalcogrammus) in the Shumagin Islands, Sanak Trough, and Morzhovoi Bay areas of the Gulf of Alaska, 7 February to 4 March 2013.
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 (2013): Water Column Sonar Data Collection (DY1302, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V59Z92WF [access date]
Resource Providers
  • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
Points of Contact
  • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
Publishers
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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
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
  • DOC/NOAA/NMFS > National Marine Fisheries Service, 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
  • GEOGRAPHIC REGION > GLOBAL
  • Vertical Location > VERTICAL LOCATION > SEA FLOOR
Use Constraints
  • Cite as: Alaska Fisheries Science Center (2013): Water Column Sonar Data Collection (DY1302, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V59Z92WF [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 on 9 February, 2013 in Volcano Bay, Kodiak Island, Alaska Peninsula, Alaska.
Acquisition Information (collection)
Instrument
  • Simrad EK60
  • Simrad ME70
  • Simrad ES60
  • Knudsen CHIRP 3260
  • SBE 49 FastCAT
  • SBE 32
  • POS/MV 320
Platform
  • Oscar Dyson (DY)
Operation
  • DY1302_EK60
Last Modified: 2017-05-30
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