ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-8331-2009 VOC measurements within a boreal forest during spring 2005: on the occurrence of elevated monoterpene concentrations during night time intense particle concentration events Eerdekens G. 1 2 Yassaa N. 1 3 Sinha V. 1 Aalto P. P. 4 Aufmhoff H. 5 6 Arnold F. 5 6 Fiedler V. 6 Kulmala M. 4 Williams J. 1 Air Chemistry Department, Max-Planck Institute of Chemistry, Mainz, Germany Plant and Vegetation Ecology, University of Antwerp, Wilrijk, Belgium Faculty of Chemistry, University of Sciences and Technology Houari Boumediene, Algiers, Algeria Department of Physics, University of Helsinki, Helsinki, Finland Atmospheric Trace Gases and Ions, Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany Atmospheric trace gases, Institute of Atmospheric Physics, DLR, Oberpfaffenhofen-Wessling, Germany 03 11 2009 9 21 8331 8350 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/9/8331/2009/acp-9-8331-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/8331/2009/acp-9-8331-2009.pdf

In this study we present measurements of selected trace gases and aerosols made in a boreal forest during the BACCI-QUEST IV intensive field campaign in Hyytiälä, Finland in April 2005. Springtime diel and vertical variations of VOCs are discussed in connection with the variations in other trace gases and with the prevailing meteorological conditions. A daytime and a nighttime event have been analysed in detail. The nighttime particle event occurred synchronously with huge increases in monoterpenes, while the second event type involved nucleation and was anti-correlated with sulphuric acid. Here we discuss the possible origins of these two distinct forms of aerosol production at the Hyytiälä site using the measurement data, air mass back trajectories and the optical stereoisomery of monoterpenes. Optical stereoisomery is used in source identification to distinguish between unnatural and natural monoterpene emissions.

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