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European Geosciences Union, Atmospheric Chemistry and Physics, 18(11), p. 9709-9719, 2011

DOI: 10.5194/acp-11-9709-2011

European Geosciences Union, Atmospheric Chemistry and Physics Discussions, 3(11), p. 9133-9163

DOI: 10.5194/acpd-11-9133-2011

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Modelling atmospheric OH-reactivity in a boreal forest ecosystem

Journal article published in 2011 by D. Mogensen, S. Smolander ORCID, A. Sogachev, L. Zhou, V. Sinha ORCID, A. Guenther, J. Williams, T. Nieminen, M. K. Kajos, J. Rinne ORCID, M. Kulmala ORCID, M. Boy ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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., 2011a) 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.