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    <gcmd:termsOfUse>https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf</gcmd:termsOfUse>
    <gcmd:keywordVersion>23.8</gcmd:keywordVersion>
    <gcmd:schemeVersion>2026-04-29T10:52:37.449Z</gcmd:schemeVersion>
    <gcmd:viewer>https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/b7410899-350a-4443-9430-c7fe1fa3a499</gcmd:viewer>
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  <skos:Concept rdf:about="b7410899-350a-4443-9430-c7fe1fa3a499">
    <skos:broader rdf:resource="457883c4-b30c-4d26-bed8-6c2887ebbc90"/>
    <skos:prefLabel xml:lang="en">PHOTOSYNTHETICALLY ACTIVE RADIATION</skos:prefLabel>
    <gcmd:reference gcmd:text="Open University.  1989. Seawater: Its Composition, Properties and Behavior. Pergamon Press. England." xml:lang="en"/>
    <skos:definition xml:lang="en">Photosynthetically Active Radiation is the light in the whole wavelengthband from 400 nm (deep violet) to 700 nm (dark red) used by plantsin photosynthesis.</skos:definition>
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