EK60 Water Column Sonar Data Collected During DY1602
Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1602, 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 2016 to
estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus).
The Shumagin Islands survey was conducted 12-15 February and included Shumagin Trough,
Stepovak Bay, Renshaw, Unga Strait, Korovin Strait, and West Nagai Strait. The Sanak
Trough survey was conducted 15-16 February followed by the Morzhovoi Bay survey on
16 February. The vessel transited to Pavlov Bay 16-17 February and completed the Pavlov
survey on February 17. The vessel transited to its home port 18-20 February. 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. 2016. 'EK60 Water Column Sonar Data Collected During DY1602'. NOAA National Centers for Environmental Information. doi:10.7289/V51Z42BW [access date]
- DY1602_EK60
- doi:10.7289/V51Z42BW
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1602_EK60
gov.noaa.ngdc.mgg.wcd:DY1602_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 | 2016-02-11T19:45:09 to 2016-02-20T00:24:07 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-163.26694
East:-152.02761
South:54.43619
North:57.78347
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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 Shumagin Islands, Sanak Trough, Morzhovoi Bay, and Pavlov Bay areas of the Gulf of Alaska |
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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 system was calibrated on 11 February, 2016 in Kalsin Bay, Kodiak Island, Alaska. 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. |
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Last Modified: 2020-06-03
For questions about the information on this page, please email:ncei.info@noaa.gov