EK60 Water Column Sonar Data Collected During DY1502
Acoustic-trawl (AT) survey of Walleye Pollock in the Gulf of Alaska (DY1502, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey in the Shumagin Islands, Sanak Trough, and Kenai peninsula bays in the Gulf of Alaska (GOA) during winter of 2015 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted 10 February to 2 March with the vessel departing and returning to Kodiak, Alaska (an intermediate port call in Kodiak, 14-18 February, was required due to a vessel mechanical issue). The Shumagin Islands survey was conducted 13 February and 20-24 February, the Sanak Trough survey was conducted 22-23 February, and the Shumagin Trough survey was conducted 23-24 February. The Shumagin Islands survey included Stepovak Bay, Unga Strait, and West Nagai Strait. The Kenai peninsula bays survey was conducted 27 February to 1 March and included Resurrection Bay, Day Harbor, Port Bainbridge, Ailik Bay, Harris Bay, Nuka Bay, Nuka Passage, and Port Dick. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The primary instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz).
Dataset Citation
- Cite as: Alaska Fisheries Science Center. 2015. 'EK60 Water Column Sonar Data Collected During DY1502'. NOAA National Centers for Environmental Information. doi:10.7289/V5B8563P [access date]
Dataset Identifiers
- DY1502_EK60
- doi:10.7289/V5B8563P
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1502_EK60
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:DY1502_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 | 2015-02-09T20:49:49 to 2015-03-03T03:41:26 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -163.0115
East: -148.28825
South: 54.428
North: 60.14641
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | Acoustic-trawl (AT) survey of walleye pollock (Gadus chalcogrammus) in the Shumagin Islands, Sanak Trough, and Kenai peninsula bays in the Gulf of Alaska region |
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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. |
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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