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    Impact of diffuse light on isoprene and monoterpene emissions from a mixed temperate forest

    Authors
    Laffineur Q.
    Aubinet M.
    Schoon N.
    Amelynck C.
    Müller J.-F.
    Dewulf J.
    Steppe K.
    Heinesch B.
    Show allShow less
    Discipline
    Earth and related Environmental sciences
    Subject
    Natural sciences
    Earth and related Environmental sciences
    Forest ecosystems
    Monoterpenes
    Isoprene
    Disjunct eddy-covariance
    PTR-MS
    Audience
    General Public
    Scientific
    Date
    2013
    Publisher
    IRM
    KMI
    RMI
    Metadata
    Show full item record
    Description
    This study investigated the impact of diffuse light on canopy scale emission of isoprene and monoterpenes measured continuously above a mixed temperate forest, using the disjunct eddy-covariance by mass scanning technique with a proton transfer reaction-mass spectrometer (PTR-MS) instrument. To assess this impact, the relationship between emissions/radiation and emissions/gross primary production (GPP) under clear sky and cloudy conditions were analysed. Under cloudy conditions (high proportion of diffuse radiation), the isoprene and monoterpene fluxes were enhanced compared to clear sky conditions (low proportion of diffuse radiation) at equivalent temperature and above-canopy total radiation. The whole-canopy enzymatic activity of the metabolic isoprene production pathway, however, was suggested to be lower under cloudy conditions than under clear sky conditions at equivalent temperature. The mechanisms behind these observations are probably linked to the better penetration of diffuse radiation in the canopy. Shade leaves/needles receive more radiation in cloudy conditions than in clear sky conditions, thereby inducing the observed effects.
    Citation
    Laffineur Q.; Aubinet M.; Schoon N.; Amelynck C.; Müller J.-F.; Dewulf J.; Steppe K.; Heinesch B. (2013). Impact of diffuse light on isoprene and monoterpene emissions from a mixed temperate forest. , Issue Atmospheric Environment, 74, 385-392, IRM,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/9005
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

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