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EK80 Water Column Sonar Data Collected During SD1023-201801

Metadata Updated: November 10, 2022

Summer surveys of the Chukchi Sea indicate that high densities of age-0 gadid fishes, historically Arctic cod (Boreogadus saida) but recently also walleye pollock (Gadus chalcogrammus), dominate the pelagic fish community. Adults are comparatively scarce, suggesting that either overwinter survivorship of age-0 gadids is low, or that they emigrate to other areas of the Pacific Arctic. To examine population movement, we conducted repeat acoustic surveys with saildrone autonomous surface vehicles equipped with echosounders throughout summer 2018. Results of these surveys were published in Levine et al. (2021).

The survey was completed by two 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 Dutch Harbor, AK on 30 June 2018, conducted acoustic surveys of the eastern Chukchi Sea from 20 July to 11 September, and returned to Dutch Harbor on 06 October. The echosounder system was calibrated via the standard sphere method before and after the cruise.

Levine, R.M., De Robertis, A., Grünbaum, D., Woodgate, R., Mordy, C.W., Mueter, F., Cokelet, E., Lawrence-Slavas, N. and Tabisola, H. (2021), Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high-latitude ecosystem. Limnol Oceanogr, 66: 1139-1154. https://doi.org/10.1002/lno.11671

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Date February 22, 2022
Metadata Created Date November 10, 2022
Metadata Updated Date November 10, 2022
Reference Date(s) June 30, 2018 (creation), February 22, 2022 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NGDC MGG Sonar Water Column

Additional Metadata

Resource Type Series
Metadata Date February 22, 2022
Metadata Created Date November 10, 2022
Metadata Updated Date November 10, 2022
Reference Date(s) June 30, 2018 (creation), February 22, 2022 (publication)
Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
Contact Email
Guid gov.noaa.ncei:SD1023-201801_EK80
Access Constraints Cite as: NOAA Alaska Fisheries Science Center. 2022. EK80 Water Column Sonar Data Collected During SD1023-201801. NOAA National Centers for Environmental Information. https://doi.org/10.25921/hqha-z958 [access date], 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., 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., Resource may not be available for up to one year after initial collection.
Bbox East Long -157.74742
Bbox North Lat 72.54504
Bbox South Lat 53.84422
Bbox West Long -168.9308
Coupled Resource
Frequency Of Update notPlanned
Harvest Object Id 44d4e28d-172d-4753-9919-dfc33bb74557
Harvest Source Id ab8b0290-e4db-4a00-89f2-4e427c2054b2
Harvest Source Title NGDC MGG Sonar Water Column
Licence 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.
Lineage Calibrated w/ calibration data
Metadata Language eng; USA
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-168.9308, 53.84422], [-157.74742, 53.84422], [-157.74742, 72.54504], [-168.9308, 72.54504], [-168.9308, 53.84422]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System urn:ogc:def:crs:EPSG::4326
Spatial Harvester True
Temporal Extent Begin 2018-06-30T00:00:00
Temporal Extent End 2018-10-06T11:59:59

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