EK60 Water Column Sonar Data Collected During DY1402
Southeastern Aleutian Basin (Bogoslof Island) Acoustic-Trawl Survey of Walleye Pollock
(DY1402, 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 Bogoslof Island
area of the southeastern Aleutian Basin during late winter of 2014 to estimate the
distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was
conducted 7-11 March, departing from Kodiak, Alaska (3 March) and arriving in Dutch
Harbor, Alaska (11 March). 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).
- Cite as: Alaska Fisheries Science Center. 2014. 'EK60 Water Column Sonar Data Collected During DY1402'. NOAA National Centers for Environmental Information. doi:10.7289/V5SQ8XCM [access date]
- DY1402_EK60
- doi:10.7289/V5SQ8XCM
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1402_EK60
gov.noaa.ngdc.mgg.wcd:DY1402_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 | 2014-03-03T06:48:48 to 2014-03-12T00:58:41 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-169.53042
East:-152.03234
South:52.83965
North:57.7839
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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 Bogoslof Island area of the southeastern Aleutian Basin |
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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 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