EK80 Water Column Sonar Data Collected During SD1046-2020-01

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted acoustic stock assessment surveys in the eastern Bering Sea (EBS) in summer of 2020 to estimate distribution and abundance of walleye pollock (Gadus chalcogrammus). This survey was initially intended as a ship-based survey, but this was cancelled due to the emerging COVID-19 pandemic. The survey was completed by three chartered 7 meter saildrone USVs. The primary water column acoustic instrument for the survey was a Simrad EK80 mini scientific echosounder system equipped with a dual frequency ES38-18/200-18CR transducer (38 kHz split-beam, 200 kHz single beam). The vessels departed Alameda, CA on 13-14 May, conducted an acoustic survey of the Bering Sea from 4-20 August, and returned to Alameda on 4 October. The echosounder system was calibrated via the standard sphere method before and after the cruise.

Dataset Citation

Cite as: Alaska Fisheries Science Center. 2021. EK80 Water Column Sonar Data Collected During SD1046-2020-01. NOAA National Centers for Environmental Information. https://doi.org/10.25921/ntmw-f777 [access date]

Dataset Identifiers

SD1046-2020-01_EK80
doi:10.25921/ntmw-f777
NCEI Metadata ID:gov.noaa.ncei:SD1046-2020-01_EK80

ISO 19115-2 Metadata

gov.noaa.ncei:SD1046-2020-01_EK80

XML


Search Data	Water Column Sonar Data Map Viewer (search) Interactive map viewer to allow discovery and access to water column sonar data
Download Data	AWS Cloud Storage Bucket (download) AWS Cloud Storage provides additional public access to water column sonar data through the NOAA Big Data Project
Distribution Formats	EK80 (Version:1) File Specification: Kongsberg/Simrad .raw files are generated by ME70, EK60 or ES60 instruments. They contain power and optionally angular position data with each beam/frequency identified by an independent channel. See the Simrad interface specification manual for further information. The .wcd files are generated by Kongsberg EM302 or EM122 instruments. See Kongsberg documentation for more information.
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	2020-05-13T00:00:00 to 2020-10-04T11:59:59
Spatial Reference System	urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown
Spatial Bounding Box Coordinates	West:-167.79299 East:-153.37471 South:49.21057 North:58.18069
Spatial Coverage Map


General Documentation	Water Column Sonar Data Archive Homepage Web page containing information on the water column sonar data archive.
Associated Resources


Publication Dates	creation: 2020-05-13 publication: 2021-04-30
Dataset Progress Status	Complete - production of the data has been completed
Data Update Frequency	Not planned
Purpose	NOAA Fisheries/Alaska Fisheries Science Center (AFSC) acoustic stock assessment surveys of walleye pollock (Gadus chalcogrammus) in the eastern Bering Sea area of the Gulf of Alaska (EBS) conducted on 4 July-20 August 2020 using three saildrone uncrewed surface vehicles (USVs).
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. 2021. EK80 Water Column Sonar Data Collected During SD1046-2020-01. NOAA National Centers for Environmental Information. https://doi.org/10.25921/ntmw-f777 [access date]
Cited Authors	DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
Custodians	NOAA National Centers for Environmental Information
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
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) Bering Sea Global Change Master Directory (GCMD) Location Keywords Vertical Location > Water Column


Use Constraints	Cite as: Alaska Fisheries Science Center. 2021. EK80 Water Column Sonar Data Collected During SD1046-2020-01. NOAA National Centers for Environmental Information. https://doi.org/10.25921/ntmw-f777 [access date] Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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. 2021. EK80 Water Column Sonar Data Collected During SD1046-2020-01. NOAA National Centers for Environmental Information. https://doi.org/10.25921/ntmw-f777 [access date]

Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.

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
Lineage Statement	The EK80 echosounder system transducers installed on the saildrones are mounted in a gimbal mount on the vehicle?s keel at a depth of 1.9 m (i.e. draft correction setting of 1.9 meters below the surface should be applied). Data during the survey were collected at a pulse length of 0.512 milliseconds. Note that some data during transits in deeper water in this data set were collected at pulse length of 1.024 milliseconds. The EK80 system was calibrated with a 38.1 mm tungsten-carbide sphere prior to deployment on 13-14 May 2020 in Alameda, California (both pulse lengths) and at the end of the cruise on 28 October 2020 in Alameda California (0.512 milliseconds only). A text file (*.ecs) containing the parameters used to process the 0.512 ms survey results is provided. In addition, the raw files recorded during calibration are provided so that users can conduct their own post-processing. The EK80 raw files do not contain GPS information. GPS data are provided as ancillary CSV files and in NETCDF files generated by Saildrone which also contain vehicle and meteorological and oceanographic data. The echosounder and vehicle clocks were synchronized hourly. The saildrone vehicles and the installation and operation of echosounders are described in De Robertis et al. (2019). Data from each of the 3 vehicles (SD1043, SD1046, SD1049) used in this survey are provided as stand-alone data sets. De Robertis, A., Lawrence-Slavas, N., Jenkins, R., Wangen, I., Mordy, C. W., Meinig, C., Levine, M., Peacock, D. Tabisola, H.. 2019. Long-term measurements of fish backscatter from saildrone unmanned surface vehicles and comparison with observations from a noise-reduced research vessel. ICES Journal of Marine Science, 76: 2459-2470.

Acquisition Information (collection)
Instrument	Simrad EK80 Simrad EK80
Platform	Saildrone
Operation	SD1046-2020-01_EK80

Last Modified: 2021-09-15

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