Berlin 2012 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Atmosphere 1

UP 2.1: Hauptvortrag

Dienstag, 27. März 2012, 09:30–10:00, HFT-FT 131

Formation of secondary organic aerosol from biogenic emissions — •Astrid Kiendler-Scharr, Jürgen Wildt, Thomas Mentel, Einhard Kleist, and Ralf Tillmann — Forschungszentrum Jülich GmbH, Jülich, Deutschland

Atmospheric oxidation of VOCs contributes to new particle formation and atmospheric organic aerosol mass [1]. The formation of aerosols from biogenic VOC emissions constitutes a possible feedback element in biosphere-atmosphere-climate interactions due to the overall cooling effect of aerosols [2]. This assumes increasing VOC emission strengths with increasing temperature and emission patterns being invariant to temperature changes. Recently evidence emerges that temperature induced changes in VOC emission patterns may alter the picture. It has been shown that increased isoprene emissions may suppress atmospheric new particle formation [3] thus dampening the cooling effect of aerosols formed from biogenic VOCs.

In addition the use of direct emissions of VOCs from plants in experiments studying secondary organic aerosol (SOA) formation shows that, beyond the so far considered main compound classes isoprene and its derivatives monoterpenes and sesquiterpenes, other VOC classes significantly impact SOA formation. Many of these VOCs are emitted under plant stress conditions.

An overview of the state of the art knowledge of SOA formation from biogenic VOCs with respect to different VOC classes will be given.

[1] Hallquist et al. ACP (2010)[2] Kulmala et al. ACP (2004)[3] Kiendler-Scharr et al. Nature (2009)