EK60 Water Column Sonar Data Collected During DY1202
Southeastern Aleutian Basin (Bogoslof Island) Acoustic-Trawl Survey of Walleye Pollock
(DY1202, 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 Bogoslof Island
area of the southeastern Aleutian Basin during the winter of 2012 to estimate the
distribution and abundance of walleye pollock (Theraga chalcogramma). The surveys
were conducted 5-15 March, departing from Kodiak, Alaska (4 March) and returning to
Kodiak at the end of cruise DY1203 on 27 March; an intermediate personnel transfer
was conducted in Kodiak on 19 March. The surveys were conducted aboard NOAA Ship Oscar
Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.
- Cite as: Alaska Fisheries Science Center. 2012. 'EK60 Water Column Sonar Data Collected During DY1202'. NOAA National Centers for Environmental Information. doi:10.7289/V5KP8060 [access date]
- DY1202_EK60
- doi:10.7289/V5KP8060
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1202_EK60
gov.noaa.ngdc.mgg.wcd:DY1202_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 | 2012-03-04T23:00:36 to 2012-03-15T20:01:33 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-169.88359
East:-152.08126
South:52.81212
North:57.7837
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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 (Theraga chalcogramma) in the southeastern Aleutian Basin near Bogoslof Island (Umnak Island and Samalga Pass) |
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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 instrument 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 prior to the cruise on 14 February 2012 in Ikatan Bay, Alaska Peninsula, Alaska. |
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Last Modified: 2020-06-03
For questions about the information on this page, please email:ncei.info@noaa.gov