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Kiendler-Scharr, A.* ; Andres, S.* ; Bachner, M.* ; Behnke, K.* ; Broch, S.* ; Hofzumahaus, A.* ; Holland, F.* ; Kleist, E.* ; Mentel, T. F.* ; Rubach, F.* ; Springer, M.* ; Steitz, B.* ; Tillmann, R.* ; Wahner, A.* ; Schnitzler, J.-P. ; Wildt, J.*

Isoprene in poplar emissions: Effects on new particle formation and OH concentrations.

Atmos. Chem. Phys. 12, 1021-1030 (2012)
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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(-2) s(-1) in non-transgenic controls (wild type WT) and nearly zero (<0.5 nmol m(-2) s(-1)) in isoprene emission-repressed plants (line RA22), respectively. Nucleation rates of up to 3600 cm(-3) s(-1) 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 (C5D8) 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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Publication type Article: Journal article
Document type Scientific Article
Keywords ORGANIC-COMPOUND EMISSIONS; REAL PLANT EMISSIONS; DECIDUOUS FOREST; OXIDATION; AEROSOLS; OZONE; BIOSYNTHESIS; PHOTOOXIDATION; SUPPRESSION; VOLATILES
Language english
Publication Year 2012
HGF-reported in Year 2012
ISSN (print) / ISBN 1680-7316
e-ISSN 1680-7324
Journal Atmospheric Chemistry and Physics
Quellenangaben Volume: 12, Issue: 2, Pages: 1021-1030 Article Number: , Supplement: ,
Publisher European Geosciences Union (EGU) ; Copernicus
Reviewing status Peer reviewed
Institute(s) Research Unit Environmental Simulation (EUS)
POF-Topic(s) 30202 - Environmental Health
Research field(s) Environmental Sciences
PSP Element(s) G-504991-001
DOI 10.5194/acp-12-1021-2012
WOS ID WOS:000300321500027
Erfassungsdatum 2012-11-26
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