Modelling atmospheric OH-reactivity in a boreal forest ecosystem

D. Mogensen, S. Smolander, Andrey Sogachev, L. Zhou, V. Sinha, A. Guenther, J. Williams, T. Nieminen, M. Kajos, J. Rinne, M. Kulmala, M. Boy

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    Abstract

    We have modelled the total atmospheric OH-reactivity in a boreal forest and investigated the individual contributions from gas phase inorganic species, isoprene, monoterpenes, and methane along with other important VOCs. Daily and seasonal variation in OH-reactivity for the year 2008 was examined as well as the vertical OH-reactivity profile. We have used SOSA; a one dimensional vertical chemistry-transport model (Boy et al., 2011) together with measurements from Hyytiälä, SMEAR II station, Southern Finland, conducted in August 2008. Model simulations only account for ~30–50% of the total measured OH sink, and in our opinion, the reason for missing OH-reactivity is due to unmeasured unknown BVOCs, and limitations in our knowledge of atmospheric chemistry including uncertainties in rate constants. Furthermore, we found that the OH-reactivity correlates with both organic and inorganic compounds and increases during summer. The summertime canopy level OH-reactivity peaks during night and the vertical OH-reactivity decreases with height.
    Original languageEnglish
    JournalAtmospheric Chemistry and Physics Discussions
    Volume11
    Issue number3
    Pages (from-to)9133-9163
    ISSN1680-7367
    DOIs
    Publication statusPublished - 2011

    Bibliographical note

    This work is distributedunder the Creative Commons Attribution 3.0 License.

    The discussion paper has a corresponding peer-reviewed final revised paper in the journal Atmospheric Chemistry and Physics (ACP): http://dx.doi.org/10.5194/acp-11-9709-2011

    Keywords

    • Wind power meteorology

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