EK60 Water Column Sonar Data Collected During DY1201
Gulf of Alaska Acoustic-Trawl Surveys of Walleye Pollock (DY1201, 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 winter of 2012 to estimate the distribution and abundance of walleye pollock (Theraga chalcogramma). The vessel departed Kodiak, Alaska on 13 February, conducted EK60 echosounder system calibration on 14 February, then proceeded to the start of the first survey (Sanak Trough, 15 February). The vessel then proceeded to the Shumagin Islands and conducted surveys at Shumagin Trough, Stepovak Bay, Renshaw Point, Unga Strait, and West Nagai Strait, 16-19 February. The vessel conducted multibeam echosounder surveys of select locations and deployed ARGO drifters 19-22 February and returned to Kodiak on 22 February. 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. 2012. 'EK60 Water Column Sonar Data Collected During DY1201'. NOAA National Centers for Environmental Information. doi:10.7289/V5G15XWH [access date]
Dataset Identifiers
- DY1201_EK60
- doi:10.7289/V5G15XWH
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1201_EK60
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:DY1201_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 | 2012-02-12T23:58:01 to 2012-02-22T19:19:33 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -163.26375
East: -151.88674
South: 54.22601
North: 58.01735
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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) in the Shumagin Islands and Sanak Trough areas of the Gulf of Alaska, 13-22 February 2012 |
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Global Change Master Directory (GCMD) Science Keywords
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Global Change Master Directory (GCMD) Instrument Keywords
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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. |
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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