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  <gcmd:gcmd>
    <gcmd:termsOfUse>https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf</gcmd:termsOfUse>
    <gcmd:keywordVersion>23.6</gcmd:keywordVersion>
    <gcmd:schemeVersion>2026-03-19T10:41:57.720Z</gcmd:schemeVersion>
    <gcmd:viewer>https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/4dd22dc9-1db4-4187-a2b7-f5b76d666055</gcmd:viewer>
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    <skos:broader rdf:resource="b9c56939-c624-467d-b196-e56a5b660334"/>
    <skos:prefLabel xml:lang="en">TRACE GASES/TRACE SPECIES</skos:prefLabel>
    <gcmd:reference gcmd:text="Atmospheric and Air Chemistry Glossary from the Sam Houston State University. &apos;http://www.shsu.edu/~chemistry/Glossary/glos.html&apos;" xml:lang="en"/>
    <skos:definition xml:lang="en">Trace gases in the atmosphere that do not occur in large quantities but
are significant to life on Earth or are important constituents of the
chemical cycles in the atmosphere. [Journal of American Hygienist
Association; v54; 639-46; 1993.] [Atmospheric Environment B; v27B; 275-82;
1993.]</skos:definition>
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