EK60 Water Column Sonar Data Collected During DY0912
Assessment of Rockfish Species in Untrawlable Habitat in the Gulf of Alaska (DY0912, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an assessment of northern rockfish (Sebastes polyspinis) and dusky rockfish (Sebastes variabilis) in untrawlable habitat areas of the Gulf of Alaska using advanced acoustics, optical, and trawl technologies, 3-13 October 2009. The primary survey site was a shallow bank along the GOA shelf break known as Snakehead. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The primary acoustic instruments for this survey were the Simrad EK60 split beam echosounder and the Simrad ME70 multibeam echosounder. The vessel departed Dutch Harbor, Alaska on 3 October and ended the cruise on 13 October in Kodiak, Alaska. The survey was conducted 4-12 October with a weather delay on 10 October.
Dataset Citation
- Cite as: Alaska Fisheries Science Center. 2009. 'EK60 Water Column Sonar Data Collected During DY0912'. NOAA National Centers for Environmental Information. doi:10.7289/V58S4N0W [access date]
Dataset Identifiers
- DY0912_EK60
- doi:10.7289/V58S4N0W
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:DY0912_EK60
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:DY0912_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 | 2009-10-03T21:36:24 to 2009-10-13T17:42:19 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -166.53074
East: -151.96303
South: 53.89178
North: 57.77291
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | Assessment of rockfish species in untrawlable habitat in the Gulf of Alaska using advanced acoustics, optical, and trawl technologies, 3-13 October 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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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 acoustic instrumentation for the survey was a Simrad EK60 split beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz), and a Simrad ME70 multibeam echosounder. 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 a previous cruise in Anderson Bay, Unalaska Island, Alaska on 6 August 2009. The ME70 transducer is mounted to the vessel's hull about 10 meters forward of the ship's centerboard, and about 1.5 meters to the port side of the vessel centerline; transducer depth is nominally 6 meters below the vessel waterline. The ME70 was calibrated during this cruise on 10 October 2009 in Three Saints 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