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    • AMLR_krill-densities_2001-2011

    Metadata Updated: February 24, 2023

    Acoustic densities of Antarctic krill in Scotia Sea from 01162001 to 03032011. Data were collected from research vessels using either Simrad EK500 (years 2001-2004) or Simrad EK60 (2005-2011) echosounders operating at 3 different frequencies (38, 120, and 200 kHz). Raw acoustic data were collected from calibrated echosounders and archived on the vessel and later on shore-based servers. The datasets were ultimately returned to the SWFSC for QA/QC, archiving and review. Krill were identified from these acoustic data using the distorted-wave Born approximation. (Reiss et al., 2008; Fielding et al., 2011). Data were exported using Echoview into gridded bins 5 m deep by 100 m horizontal over a total depth range of 5 m to a maximum of 505 m below the hulls of survey vessels.

    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.

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    Dates

    Metadata Date February 22, 2023
    Metadata Created Date February 10, 2023
    Metadata Updated Date February 24, 2023
    Reference Date(s) January 16, 2001 (creation), February 7, 2023 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date February 22, 2023
    Metadata Created Date February 10, 2023
    Metadata Updated Date February 24, 2023
    Reference Date(s) January 16, 2001 (creation), February 7, 2023 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ncei:AMLR_krill-densities_2001-2011
    Access Constraints Cite as: NOAA Southwest Fisheries Science Center. 2023. Acoustic Densities of Antarctic Krill from 2001-2011. NOAA National Centers for Environmental Information. https://doi.org/10.25921/akjq-eq14 [access date], Resource may not be available for up to one year after initial collection., 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.
    Bbox East Long -43
    Bbox North Lat -58
    Bbox South Lat -65
    Bbox West Long -64
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 5993b03f-feca-4bb3-bc98-26b72875c0da
    Harvest Source Id ab8b0290-e4db-4a00-89f2-4e427c2054b2
    Harvest Source Title NGDC MGG Sonar Water Column
    Licence Not subject to copyright protection within the United States.
    Lineage Reiss, C.S., Cossio, A.M., Loeb, V., Demer, D.A. 2008. Variations in the biomass of Antarctic krill (Euphausia superba) around the South Shetland Islands, 1996-2006. ICES Journal of Marine Science. 65: 497-508. Kinzey, D., Watters, G.M., Reiss, C.S. 2015. Selectivity and two biomass measures in an age-based assessment of Antarctic krill (Euphausia superba). Fisheries Research, 168: 72–84 Kinzey, D., Cossio, A.M., Reiss, C.S., Watters, G.M. 2022. Acoustic sampling of Antarctic krill with simulated underwater buoyancy gliders: Does the sawtooth dive pattern work? Front. Mar. Sci., Volume 9 - 2022. https://doi.org/10.3389/fmars.2022.1064181
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-64.0, -65.0], [-43.0, -65.0], [-43.0, -58.0], [-64.0, -58.0], [-64.0, -65.0]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2001-01-16T00:00:00
    Temporal Extent End 2011-03-03T11:59:59

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