EK60 Water Column Sonar Data Collected During DY0909
Acoustic-Trawl Survey of Walleye Pollock on the U.S. and Russian Bering Sea Shelf (DY0909, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the U.S. and Russian Bering Sea shelf during late spring/summer of 2009 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted from Bristol Bay, eastern Bering Sea in the U.S. to Cape Navarin, Russia, 9 June to 7 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Kodiak, Alaska on 5 June and arrived in Dutch Harbor on 7 August. The cruise was completed in three legs (leg 1, 9-28 June; leg 2, 1-18 July; leg 3, 21 July to 7 August), with port calls in Dutch Harbor, Alaska; a personnel exchange occurred in Dutch Harbor on 21 June. Fisheries gear research operations were conducted on 16 June and again 3-5 August. The EK60 echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska 10-11 June, and at the end of the cruise in Anderson Bay, Unalaska Island, Alaska 6-7 August.
Dataset Citation
- Cite as: Alaska Fisheries Science Center. 2009. 'EK60 Water Column Sonar Data Collected During DY0909'. NOAA National Centers for Environmental Information. doi:10.7289/V5J67F1M [access date]
Dataset Identifiers
- DY0909_EK60
- doi:10.7289/V5J67F1M
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY0909_EK60
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:DY0909_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 | 2009-06-09T21:34:00 to 2009-08-07T15:10:01 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -180.0
East: 179.99993
South: 53.06667
North: 62.35353
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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 (Theragra chalcogramma) on the U.S. and Russian Bering Sea shelf, aboard NOAA Ship Oscar Dyson 9 June to 7 August 2009. |
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Global Change Master Directory (GCMD) Science Keywords
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Global Change Master Directory (GCMD) Data Center 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 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 echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska 10-11 June 2009, and at the end of the cruise, 6-7 August 2009 in Anderson Bay, Unalaska 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
For questions about the information on this page, please email: ncei.info@noaa.gov