Methanol and other VOC fluxes from a Danish beech forest during late springtime

Gunnar W. Schade, Sheena J. Solomon, Ebba Dellwik, Kim Pilegaard, Annette Ladstätter-Weissenmayer

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    In-canopy mixing ratio gradients and above-canopy fluxes of several volatile organic compounds (VOCs) were measured using a commercial proton transfer reaction mass spectrometer (PTR-MS) in a European beech (Fagus sylvatica) forest in Denmark. Fluxes of methanol were bidirectional: Emission occurred during both day and night with highest fluxes (0.2 mg C m−2 h−1) during a warm period; deposition occurred dominantly at daytime. Confirming previous branch-level measurements on beech, the forest’s monoterpene emissions (0–0.5 mg C m−2 h−1), and in-canopy mixing ratios showed a diurnal cycle consistent with light-dependent emissions; a result contrasting temperature-only driven emissions of most conifer species. Also emitted was acetone, but only at ambient temperatures exceeding 20°C. Slow deposition dominated at lower temperatures. Our in-canopy gradient measurements contrast with earlier results from tropical and pine forest ecosystems in that they did not show this beech ecosystem to be a strong sink for oxygenated VOCs (OVOCs). Instead, their gradients were flat and only small deposition velocities (
    Original languageEnglish
    JournalBiogeochemistry
    Volume106
    Issue number3
    Pages (from-to)337-355
    ISSN0168-2563
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Bio systems
    • Environment and climate

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