EK60 Water Column Sonar Data Collected During DY1604
Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (DY1604, 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 Shelikof Strait and Marmot Bay areas of the Gulf of Alaska (GOA) during late winter/early spring of 2016 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The Shelikof Strait survey was conducted 14-21 March, and the Marmot Bay survey was conducted 22-24 March, 2016. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.
Dataset Citation
- Cite as: Alaska Fisheries Science Center. 2016. 'EK60 Water Column Sonar Data Collected During DY1604'. NOAA National Centers for Environmental Information. doi:10.7289/V5F769JQ [access date]
Dataset Identifiers
- DY1604_EK60
- doi:10.7289/V5F769JQ
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1604_EK60
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:DY1604_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 | 2016-03-09T21:29:56 to 2016-03-24T12:45:18 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -165.17622
East: -151.64086
South: 54.11874
North: 58.51543
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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 Shelikof Strait and Marmot Bay areas of the Gulf of Alaska |
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Global Change Master Directory (GCMD) Science Keywords
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Global Change Master Directory (GCMD) Data Center Keywords
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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 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 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 system was calibrated on 11 February, 2016 in Kalsin Bay, Kodiak Island, Alaska, and again on 18 March, 2016 in Alitak Bay (near Cape Hepburn), 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
For questions about the information on this page, please email: ncei.info@noaa.gov