Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1307, 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 during the late spring/early summer of 2013 in the Gulf of Alaska to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted on the Gulf of Alaska shelf extending from the Islands of Four Mountains to Yakutat Bay, 8 June to 9 August 2013, in three legs (leg 1, 8-26 June; leg 2, 30 June to 18 July; leg 3, 22 July to 9 August) aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Dutch Harbor, Alaska on 9 June with intermediate port calls in Kodiak, Alaska. Smaller surveys were also conducted in several bays and around islands including Sanak Trough (15 June), Morzhovoi Bay (15 June), Pavlof Bay (16 June), the Shumagin Islands area (including Renshaw Point, Unga Strait, and West Nagai Strait; 19-23 June), Mitrofania Island (22-23 June), Nakchamik Island (24-25 June), Shelikof Strait (1-7 July), Alitak Bay (9-10 July), Barnabas Trough (11-14 July), Chiniak Trough (14-16 July), Marmot Bay (16-17 July), Prince William Sound (29 July to 1 August), Kayak Island Trough (3-4 August), and Yakutat Trough (5-7 August). The cruise ended when the vessel arrived in Kodiak, Alaska on 9 August 2013.
  • Cite as: Alaska Fisheries Science Center (2013): Water Column Sonar Data Collection (DY1307, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5Z31WM1 [access date]
gov.noaa.ngdc.mgg.wcd:DY1307_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 2013-06-08T19:18:01 to 2013-08-09T00:00:00
Spatial Reference System urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates
N: 61.1178420411987
S: 52.366153350588
E: -139.66058053364
W: -170.10467
Spatial Coverage Map
Documentation links not available.
Publication Dates
  • creation: 2013-06-08
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) on the Gulf of Alaska shelf from the Islands of Four Mountains to Yakutat Bay including several smaller surveys in bays and around islands, 8 June to 9 August 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 (DY1307, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5Z31WM1 [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 (DY1307, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5Z31WM1 [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 instrument 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 in Captain?s Bay, Dutch Harbor, Alaska on 8 June 2013 and a post-cruise calibration was conducted on 7 August in Sea Otter Bay, Yakutat, 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
  • DY1307_Leg1_EK60
Last Modified: 2017-05-30
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