EK60 Water Column Sonar Data Collected During DY1303
Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1303, 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 2013 to estimate the distribution and abundance of walleye pollock (Gadus
chalcogrammus). The vessel departed Kodiak, Alaska on 14 March arriving at the start
of the first survey on 15 March. The Marmot Bay survey was conducted 15-16 March,
Shelikof Strait 16-25 March, and Gulf of Alaska shelf break east of Chirikof Island
25-27 March. The vessel arrived in Kodiak 28 March following a post-cruise EK60 calibration
on 27 March in Three Saints Bay, Kodiak Island, Alaska. 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. 2013. 'EK60 Water Column Sonar Data Collected During DY1303'. NOAA National Centers for Environmental Information. doi:10.7289/V5PK0D4X [access date]
- DY1303_EK60
- doi:10.7289/V5PK0D4X
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1303_EK60
gov.noaa.ngdc.mgg.wcd:DY1303_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 | 2013-03-13T00:02:22 to 2013-03-28T16:15:42 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-156.72324
East:-151.66765
South:55.61838
North:58.49317
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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 (Gadus chalcogrammus) in the Marmot Bay, Shelikof Strait, and Chirikof shelf break areas of the Gulf of Alaska, 14-28 March 2013. |
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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 9 February, 2013 in Volcano Bay, Kodiak Island, 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