EK60 Water Column Sonar Data Collected During DY0901
Gulf of Alaska Acoustic-Trawl Surveys of Walleye Pollock (DY0901, 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 western Gulf of Alaska (GOA) during the winter of
2009 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma).
The vessel departed Kodiak, Alaska on 12 February and conducted acoustic echosounder
system calibrations in Three Saints Bay, Kodiak Island, Alaska on 12-13 February.
The vessel conducted the Shumagin Islands survey (including Shumagin Trough, Stepovak
Bay, Renshaw Point, Unga Strait, and West Nagai Strait) 15-18 February. The vessel
then surveyed Sanak Trough on 18-19 February, followed by a survey of the continental
shelf break from Sanak Island to Unalaska Island 19-20 February. The vessel conducted
equipment research operations utilizing a lowered target strength transducer system
21-22 February and arrived in Dutch Harbor, Alaska on 22 February. The primary acoustic
echosounder system for this survey was a Simrad EK60; a Simrad ME70 multibeam echosounder
system was also operated for the duration of the cruise. The survey was conducted
aboard NOAA Ship Oscar Dyson, a 64 meter fisheries research stern trawler equipped
with acoustic and oceanographic instrumentation.
- Cite as: Alaska Fisheries Science Center. 2009. 'EK60 Water Column Sonar Data Collected During DY0901'. NOAA National Centers for Environmental Information. doi:10.7289/V59S1P3T [access date]
- DY0901_EK60
- doi:10.7289/V59S1P3T
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY0901_EK60
gov.noaa.ngdc.mgg.wcd:DY0901_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 | 2009-02-12T03:14:11 to 2009-02-22T15:32:13 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-168.09573
East:-152.0455
South:53.01667
North:57.78369
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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 (Theragra chalcogramma) in the Shumagin Islands and Sanak Trough areas of the Gulf of Alaska, 13-22 February 2009 |
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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 vessel is also equipped with a Simrad ME70 multibeam echosounder system with a hull mounted transducer. The EK60 and ME70 systems were calibrated at the start of the cruise on 12-13 February 2009 in Three Saints Bay, Kodiak Island, Alaska. |
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Last Modified: 2020-06-03
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