Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1303, 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 Gulf of Alaska (GOA) during the late winter/early spring of 2013 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The vessel departed Kodiak, Alaska on 14 March arriving at the start of the first survey on 15 March. The Marmot Bay survey was conducted 15-16 March, Shelikof Strait 16-25 March, and Gulf of Alaska shelf break east of Chirikof Island 25-27 March. The vessel arrived in Kodiak 28 March following a post-cruise EK60 calibration on 27 March in Three Saints Bay, Kodiak Island, Alaska. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.

Dataset Citation

Cite as: Alaska Fisheries Science Center (2013): Water Column Sonar Data Collection (DY1303, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5PK0D4X [access date]

Dataset Identifiers

DY1303_EK60
doi:10.7289/V5PK0D4X

ISO 19115-2 Metadata

gov.noaa.ngdc.mgg.wcd:DY1303_EK60

XML


Search Data	Water Column Sonar Data Map Viewer (search) Interactive map viewer to allow discovery and access to water column sonar data
Distribution Formats	Simrad EK60 raw (.raw) format (Version: 1) File Specification: Simrad EK60 raw files. See the Simrad EK60 interface specification manual for additional information.
Ordering Instructions	Contact the NCEI Water Column Sonar Data Manager to order data
Distributor	Chuck Anderson Water Column Sonar Data Manager DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (303) 497-4742 wcd.info@noaa.gov
Dataset Principal Investigator	Chris Wilson Supervisory Research Fish Biologist DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center (206) 526-6435 chris.wilson@noaa.gov


Time Period	2013-03-13T00:02:22 to 2013-03-28T16:15:42
Spatial Reference System	urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates	N: 58.49317 S: 55.61838 E: -151.66765 W: -156.72324
Spatial Coverage Map


Documentation links not available.


Publication Dates	creation: 2013-03-13
Dataset Progress Status	Complete - production of the data has been completed
Data Update Frequency	Not planned
Purpose	Acoustic-trawl (AT) surveys of walleye pollock (Gadus chalcogrammus) in the Marmot Bay, Shelikof Strait, and Chirikof shelf break areas of the Gulf of Alaska, 14-28 March 2013.
Use Limitations	These data are considered raw and have not been subjected to the NOAA's quality control or quality assurance procedures. They are released for limited public use as preliminary data to be used only with appropriate caution. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. Not subject to copyright protection within the United States.


Dataset Citation	Cite as: Alaska Fisheries Science Center (2013): Water Column Sonar Data Collection (DY1303, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5PK0D4X [access date]
Custodians	DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Resource Providers	DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
Points of Contact	DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
Publishers	NOAA National Centers for Environmental Information


Theme keywords	Global Change Master Directory (GCMD) Science Keywords Earth Science > Oceans > Ocean Acoustics > Acoustic Scattering Earth Science > Oceans > Aquatic Sciences > Fisheries Earth Science > Oceans > Ocean Acoustics Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Pelagic Earth Science > Biosphere > Ecosystems > Marine Ecosystems Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic Earth Science > Biosphere > Ecosystems > Aquatic Ecosystems Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
Data Center keywords	Global Change Master Directory (GCMD) Data Center Keywords DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NMFS > National Marine Fisheries Service, NOAA, U.S. Department of Commerce Global Change Master Directory (GCMD) Data Center Keywords DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Instrument keywords	Global Change Master Directory (GCMD) Instrument Keywords In Situ/Laboratory Instruments > Profilers/Sounders > Acoustic Sounders > WCMS > Water Column Mapping System
Place keywords	International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23) Gulf of Alaska Global Change Master Directory (GCMD) Location Keywords GEOGRAPHIC REGION > GLOBAL Vertical Location > VERTICAL LOCATION > SEA FLOOR


Use Constraints	Cite as: Alaska Fisheries Science Center (2013): Water Column Sonar Data Collection (DY1303, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5PK0D4X [access date]
Access Constraints	Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. Resource may not be available for up to one year after initial collection.
Fees	Free

Use Constraints

Cite as: Alaska Fisheries Science Center (2013): Water Column Sonar Data Collection (DY1303, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5PK0D4X [access date]

Access Constraints

Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.

Resource may not be available for up to one year after initial collection.

Fees

Free

Lineage information for: series
Processor	DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center

Lineage information for: series
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 EK60 system was calibrated on 9 February, 2013 in Volcano Bay, Kodiak Island, Alaska Peninsula, Alaska.

Acquisition Information (collection)
Instrument	Simrad EK60 Simrad ME70 Simrad EK60 Simrad ES60 Knudsen CHIRP 3260 Sippican XBT/XSV SBE 49 FastCAT SBE 911plus CTD SBE 32 POS/MV 320
Platform	Oscar Dyson (DY)
Operation	DY1303_EK60

Last Modified: 2017-05-30

For questions about the information on this page, please email: wcd.info@noaa.gov