EK60 Water Column Sonar Data Collected During DY1103
Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1103, 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 during the late spring/summer of 2011 in the Gulf of Alaska to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted on the Gulf of Alaska shelf extending from the Islands of Four Mountains to the Chiniak Trough east of Kodiak Island, 14 June to 12 August 2011, in three legs (leg 1, 14-29 June; leg 2, 5-22 July; leg 3, 6-12 August) aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Kodiak, Alaska on 14 June with intermediate port calls in Kodiak, Alaska. An extended port call occurred between legs 2 and 3 (22 July to 6 August) due to vessel mechanical issues. Smaller surveys were also conducted in several bays and around islands including Morzhovoi Bay (22 June), Sanak Trough (23 June), Pavlof Bay (25 June), the Shumagin Islands area (7-8 July), Mitrofania Island (9-10 July), Nakchamik Island (11-12 July), Shelikof Strait (16-21 July), Chiniak Trough (7-8 August), Barnabas Trough (9-10 and 11-12 August), and Alitak Bay (10-11 August). The cruise ended when the vessel arrived in Kodiak, Alaska on 12 August 2011.
Dataset Citation
- Cite as: Alaska Fisheries Science Center. 2011. 'EK60 Water Column Sonar Data Collected During DY1103'. NOAA National Centers for Environmental Information. doi:10.7289/V5WH2N2V [access date]
Dataset Identifiers
- DY1103_EK60
- doi:10.7289/V5WH2N2V
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY1103_EK60
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:DY1103_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 | 2011-06-14T01:38:45 to 2011-08-12T22:46:39 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -170.09375
East: -151.05
South: 52.03333
North: 59.24596
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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) on the Gulf of Alaska shelf from the Islands of Four Mountains to Chiniak Trough east of Kodiak Island including several smaller surveys in bays and around islands, 14 June to 12 August 2011 |
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Global Change Master Directory (GCMD) Science 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 system was calibrated in Three Saints Bay, Kodiak Island, Alaska on 14 June 2011 and a post-cruise calibration was conducted on 7 August 2011 in Kalsin Bay, Kodiak 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