{
    "identifier": "gov.noaa.ncei:SD1023-201801_EK80",
    "accessLevel": "public",
    "contactPoint": {
        "@type": "vcard:Contact",
        "fn": "Your contact point",
        "hasEmail": "mailto:[email protected]"
    },
    "programCode": [
        "010:000"
    ],
    "landingPage": "",
    "title": "EK80 Water Column Sonar Data Collected During SD1023-201801",
    "description": "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).\n\nThe 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.\n\nLevine, R.M., De Robertis, A., Gr\u00fcnbaum, 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",
    "language": "",
    "distribution": [
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            "@type": "dcat:Distribution",
            "mediaType": "application\/json",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ncei%3ASD1023-201801_EK80"
        },
        {
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            "mediaType": "text\/html",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ncei%3ASD1023-201801_EK80\/html"
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    ],
    "bureauCode": [
        "010:04"
    ],
    "modified": "2024-08-08T09:19:17.831Z",
    "publisher": {
        "@type": "org:Organization",
        "name": "Your Publisher"
    },
    "theme": "",
    "keyword": [
        "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",
        "Chukchi Sea",
        "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",
        "Vertical Location > Water Column",
        "In Situ\/Laboratory Instruments > Profilers\/Sounders > Acoustic Sounders > WCMS > Water Column Mapping System",
        "oceans",
        "geoscientificInformation"
    ]
}