EK60 Water Column Sonar Data Collected During DY1203
Gulf of Alaska Acoustic-Trawl Surveys of Walleye Pollock (DY1203, 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 late winter/early
spring of 2012 to estimate the distribution and abundance of walleye pollock (Theraga
chalcogramma). The survey was conducted along the Gulf of Alaska shelf break east
of Chrikof Island (17-19 March) and throughout the Shelikof sea valley (20-26 March).
The vessel departed Kodiak, Alaska on 5 March for the start of cruise DY1202 and was
at sea for the start of the Chirikof shelf break survey. The vessel conducted a personnel
transfer in Kodiak on 19 March then proceeded to the Shelikof Strait survey area.
A post-cruise EK60 echosounder system calibration was conducted on 26 March in Malina
Bay, Afognak Island, Alaska and the vessel returned to Kodiak at the completion of
the cruise on 27 March. 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. 2012. 'EK60 Water Column Sonar Data Collected During DY1203'. NOAA National Centers for Environmental Information. doi:10.7289/V5QF8QWG [access date]
- DY1203_EK60
- doi:10.7289/V5QF8QWG
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1203_EK60
gov.noaa.ngdc.mgg.wcd:DY1203_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 | 2012-03-15T20:02:48 to 2012-03-27T15:10:39 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-165.6079
East:-152.08266
South:53.96735
North:58.50461
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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 (Theraga chalcogramma) along the Gulf of Alaska shelf break, 17-27 March 2012 |
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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 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 on 14 February 2012 in Ikatan Bay, Alaska Peninsula, Alaska. A post-cruise EK60 system calibration was conducted on 26 March in Malina Bay, Afognak 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