EK500 Water Column Sonar Data Collected During MF0309
Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (MF0309, EK500). 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 in the Gulf of Alaska during late spring/early summer of 2003 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted along the Gulf of Alaska (GOA) shelf and shelfbreak from the Shumagin Islands to Prince William Sound, 4 June to 16 July 2003, aboard NOAA Ship Miller Freeman, a 66 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Kodiak, Alaska on 4 June and arrived in Kodiak on 16 July. The echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska on 5 June, and at the end of the cruise in Ugak Bay, Kodiak Island, Alaska, 16 July 2003.
Dataset Citation
- Cite as: Alaska Fisheries Science Center. 2003. 'EK500 Water Column Sonar Data Collected During MF0309'. NOAA National Centers for Environmental Information. doi:10.7289/V51834KK [access date]
Dataset Identifiers
- MF0309_EK500
- doi:10.7289/V51834KK
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:MF0309_EK500
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:MF0309_EK500
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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 | 2003-06-04T00:00:00 to 2003-07-15T23:59:59 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -160.58005
East: -15.39866
South: 54.47687
North: 60.83285
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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) in the Gulf of Alaska, 4 June to 16 July 2003 |
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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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International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
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Lineage Statement | The primary acoustic instruments for the survey were a Simrad EK500 split-beam echosounder system utilizing two frequencies (38 and 120 kHz), and a Simrad EK60 split-beam echosounder operating at 200 kHz. The transducers installed on the Miller Freeman were mounted on a deployable centerboard. The transducer draft settings 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 6.15 meters below the surface. The echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska 6 June 2003, and at the end of the cruise, 16 July 2003 in Ugak 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