Ozone uptake by an evergreen forest canopy - temporal variation and possible mechanisms

Teis Nørgaard Mikkelsen, H. Ro-Poulsen, K. Pilegaard, M.F. Hovmand, N.O. Jensen, C.S. Christensen, P. Hummelshøj

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Patterns of ozone concentration ([O(3)]), O(3) deposition velocity (nu(d)) and O(3) flux (F(c)) over an evergreen forest canopy are shown in relation to measuring method, physiological activity of the trees, and lime of year. The gradient and eddy correlation methods were compared and showed similar diel nu(d) patterns. Daytime F(c) was correlated with CO(2) and water vapour fluxes, while no correlation between [O(3)] in the range 10-70 ppb (nl l(-1)) and F(c)was seen in this study. F(c) was primarily driven by stomatal conductance, reactions with surfaces, particles and gases, and not by [O(3)]. On a monthly basis, [O(3)] was always highest in the afternoon while nu(d) was typically higher in the morning, resulting in an equal F(c) over the day. Night-time F(c) was more than half of the daytime O(3) flux. The data reveal the importance of emissions of nitric oxide and terpenes as O(3) removal factors in evergreen forest dominated by Norway spruce. (C) 2000 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalEnvironmental Pollution
    Volume109
    Issue number3
    Pages (from-to)423-429
    ISSN0269-7491
    DOIs
    Publication statusPublished - 2000

    Keywords

    • Ozone flux
    • Ozone deposition
    • Terpenes
    • Volatile organic compounds
    • Gradient and eddy correlation method

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