Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1303, 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 2013 to estimate the distribution and abundance of walleye
pollock (Gadus chalcogrammus). The vessel departed Kodiak, Alaska on 14 March arriving
at the start of the first survey on 15 March. The Marmot Bay survey was conducted
15-16 March, Shelikof Strait 16-25 March, and Gulf of Alaska shelf break east of Chirikof
Island 25-27 March. The vessel arrived in Kodiak 28 March following a post-cruise
EK60 calibration on 27 March in Three Saints Bay, Kodiak Island, Alaska. 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 (DY1303, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5PK0D4X [access date]
- DY1303_EK60
- doi:10.7289/V5PK0D4X
gov.noaa.ngdc.mgg.wcd:DY1303_EK60
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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 | 2013-03-13T00:02:22 to 2013-03-28T16:15:42 |
Spatial Reference System | urn:ogc:def:crs:EPSG:4326 |
Spatial Bounding Box Coordinates |
N: 58.49317
S: 55.61838
E: -151.66765
W: -156.72324
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Documentation links not available. |
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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 Marmot Bay, Shelikof Strait, and Chirikof shelf break areas of the Gulf of Alaska, 14-28 March 2013. |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Instrument keywords | Global Change Master Directory (GCMD) Instrument Keywords
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Place keywords | International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas"
publication S-23)
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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. |
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Last Modified: 2017-05-30
For questions about the information on this page, please email: wcd.info@noaa.gov