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    <gcmd:schemeVersion>2026-04-29T10:52:37.449Z</gcmd:schemeVersion>
    <gcmd:viewer>https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/e55a85d0-2de9-4b4d-92d7-9cd5b0d9671a</gcmd:viewer>
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    <skos:prefLabel xml:lang="en">MBT</skos:prefLabel>
    <skos:definition xml:lang="en">The mechanical bathythermograph was the predecessor to theexpendable bathythermograph which remains a cornerstone in shipsof opportunity sampling today. This instrument was used toobtain continuous tracings of temperature versus depth in thesurface layers of the ocean.[Summary provided by NOAA]</skos:definition>
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