EK60 Water Column Sonar Data Collected During DY1001
Gulf of Alaska Acoustic-Trawl Surveys of Walleye Pollock (DY1001, 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 2010 to
estimate the distribution and abundance of walleye pollock (Theragra chalcogramma).
The vessel departed Kodiak, Alaska on 22 February and conducted an EK60 echosounder
system calibration in Three Saints Bay, Kodiak Island, Alaska. The vessel conducted
the Shumagin Islands survey (including Shumagin Trough, Stepovak Bay, Renshaw Point,
Unga Strait, and West Nagai Strait) 23-25 February. The vessel then surveyed Sanak
Trough, Marzhovoi Bay, and Pavlof Bay, 26-28 February, followed by fisheries research
work on Snakehead shelf, 1-2 March. Acoustic-trawl surveys were conducted in Kenai
Peninsula Bays (2-5 March), Prince William Sound (5-7 March), and Marmot Bay (8-9
March) with the survey ending in Kodiak, Alaska on 9 March, 2010. 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. 'EK60 Water Column Sonar Data Collected During DY1001'. NOAA National Centers for Environmental Information. doi:10.7289/V5C82772 [access date]
- DY1001_EK60
- doi:10.7289/V5C82772
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1001_EK60
gov.noaa.ngdc.mgg.wcd:DY1001_EK60
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Ordering Instructions | Contact the NCEI Water Column Sonar Data Manager to order data. |
Distributor | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Water Column Sonar Data Manager NOAA National Centers for Environmental Information (303) 497-4742 wcd.info@noaa.gov |
Time Period | 2010-02-16T02:59:10 to 2010-03-09T16:06:46 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-163.31094
East:-122.42662
South:47.71825
North:60.88074
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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 (Theragra chalcogramma) in the Shumagin Islands, Sanak Trough, Morzhovoi Bay, Pavlof Bay, Kenai Peninsula bays, Prince William Sound, and Marmot Bay areas of the Gulf of Alaska, 22 February to 9 March 2010 |
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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 at the start of the cruise on 22 February 2010 in Three Saints Bay, Kodiak Island, Alaska. |
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Last Modified: 2020-06-03
For questions about the information on this page, please email:ncei.info@noaa.gov