ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-1021-2012 Isoprene in poplar emissions: effects on new particle formation and OH concentrations Kiendler-Scharr A. 1 Andres S. 1 Bachner M. 1 Behnke K. 2 4 Broch S. 1 Hofzumahaus A. 1 Holland F. 1 Kleist E. 3 Mentel T. F. 1 Rubach F. 1 Springer M. 1 Steitz B. 1 Tillmann R. 1 Wahner A. 1 Schnitzler J.-P. 2 4 Wildt J. 3 Institute of Energy and Climate Research, Troposphere (IEK-8), Forschungszentrum Jülich GmbH, Jülich, Germany Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany Institute of Bio- and Geosciences, Plant Sciences (IBG-2), Forschungszentrum Jülich GmbH, Jülich, Germany present address: Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Neuherberg, Germany 20 01 2012 12 2 1021 1030 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/12/1021/2012/acp-12-1021-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/1021/2012/acp-12-1021-2012.pdf

Stress-induced volatile organic compound (VOC) emissions from transgenic Grey poplar modified in isoprene emission potential were used for the investigation of photochemical secondary organic aerosol (SOA) formation. In poplar, acute ozone stress induces the emission of a wide array of VOCs dominated by sesquiterpenes and aromatic VOCs. Constitutive light-dependent emission of isoprene ranged between 66 nmol m<sup>−2</sup> s<sup>−1</sup> in non-transgenic controls (wild type WT) and nearly zero (<0.5 nmol m<sup>−2</sup> s<sup>−1</sup>) in isoprene emission-repressed plants (line RA22), respectively. Nucleation rates of up to 3600 cm<sup>−3</sup> s<sup>−1</sup> were observed in our experiments. In the presence of isoprene new particle formation was suppressed compared to non-isoprene containing VOC mixtures. Compared to isoprene/monoterpene systems emitted from other plants the suppression of nucleation by isoprene was less effective for the VOC mixture emitted from stressed poplar. This is explained by the observed high efficiency of new particle formation for emissions from stressed poplar. Direct measurements of OH in the reaction chamber revealed that the steady state concentration of OH is lower in the presence of isoprene than in the absence of isoprene, supporting the hypothesis that isoprenes' suppressing effect on nucleation is related to radical chemistry. In order to test whether isoprene contributes to SOA mass formation, fully deuterated isoprene (C<sub>5</sub>D<sub>8</sub>) was added to the stress-induced emission profile of an isoprene free poplar mutant. Mass spectral analysis showed that, despite the isoprene-induced suppression of particle formation, fractions of deuterated isoprene were incorporated into the SOA. A fractional mass yield of 2.3% of isoprene was observed. Future emission changes due to land use and climate change may therefore affect both gas phase oxidation capacity and new particle number formation.

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