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    <skos:prefLabel xml:lang="en">SUCCESS</skos:prefLabel>
    <skos:changeNote>Date=2026-02-06 User Id=tstevens User Note=updated keyword definition</skos:changeNote>
    <skos:definition xml:lang="en">The Atmospheric Aerosol Chemical Composition Measurements for the Subsonic Aircraft: Contrail and Cloud Effects Special Study (SUCCESS) was an airborne expedition conducted aboard the NASA Ames DC-8 research aircraft during April/May 1996. The purpose of this project was to better determine the radiative properties of cirrus clouds and contrails so that satellite observations can more reliably assess their impact on Earth’s radiation budget. The goals of the program included determining how cirrus clouds form, whether exhaust from subsonic aircraft affects their formation, and if the changes might be climatologically significant. Measurements were taken to better determine the chemical characteristics of gaseous and particulate exhaust products from subsonic aircraft and their temporal evolution in the upper troposphere. The Global Atmospheric Chemistry Group at the University of New Hampshire conducted measurements of the detailed chemical composition of the atmospheric aerosol.</skos:definition>
    <dcterms:modified>2026-02-06T12:27:08.948Z</dcterms:modified>
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    <gcmd:altLabel gcmd:text="Subsonic Aircraft Contrail and Cloud Effects Special Study" xml:lang="en" gcmd:category="primary"/>
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