ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-9709-2011 Modelling atmospheric OH-reactivity in a boreal forest ecosystem Mogensen D. 1 2 Smolander S. 1 Sogachev A. 3 Zhou L. 1 Sinha V. 4 5 Guenther A. 6 Williams J. 4 Nieminen T. 1 Kajos M. K. 1 Rinne J. 1 Kulmala M. 1 Boy M. 1 Division of Atmospheric Sciences, Department of Physics, P.O. Box 48, University of Helsinki, 00014, Finland Helsinki University Centre for Environment, P.O. Box 27, University of Helsinki, 00014, Finland Wind Energy Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Building 118, Box 49, 4000, Roskilde, Denmark Max Planck Institute of Chemistry, J. Becher Weg 27, 55128 Mainz, Germany Indian Institute of Science Education and Research (IISER) Mohali, MGSIPAP Complex, Sector 26, Chandigarh 160019, India National Center for Atmospheric Research, Boulder, CO 80307, USA 20 09 2011 11 18 9709 9719 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/9709/2011/acp-11-9709-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/9709/2011/acp-11-9709-2011.pdf

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.

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