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000187507 1001_ $$0P:(DE-HGF)0$$aBergström, R.$$b0
000187507 245__ $$aBiotic stress: a significant contributor to organic aerosol in Europe?
000187507 260__ $$aKatlenburg-Lindau$$bEGU$$c2014
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000187507 520__ $$aWe have investigated the potential impact on organic aerosol formation from biotic stress-induced emissions (SIE) of organic molecules from forests in Europe (north of lat. 45° N). Emission estimates for sesquiterpenes (SQT), methyl salicylate (MeSA) and unsaturated C17 compounds, due to different stressors, are based on experiments in the Jülich Plant Atmosphere Chamber (JPAC), combined with estimates of the fraction of stressed trees in Europe based on reported observed tree damage.SIE were introduced in the EMEP MSC-W chemical transport model and secondary organic aerosol (SOA) yields from the SIE were taken from the JPAC experiments. Based on estimates of current levels of infestation and the JPAC aerosol yields, the model results suggest that the contribution to SOA in large parts of Europe may be substantial. It is possible that SIE contributes as much, or more, to organic aerosol than the constitutive biogenic VOC emissions, at least during some periods. Based on the assumptions in this study, SIE-SOA are estimated to constitute between 50 and 70 % of the total biogenic SOA (BSOA) in a current-situation scenario where the biotic stress in northern and central European forests causes large SIE of MeSA and SQT. An alternative current-situation scenario with lower SIE, consisting solely of SQT, leads to lower SIE-SOA, between 20 and 40 % of the total BSOA.Hypothetical future scenarios with increased SIE, due to higher degrees of biotic stress, show that SOA formation due to SIE can become even larger.Unsaturated C17 BVOC (biogenic volatile organic compounds) emitted by spruce infested by the forest-honey generating bark louse, Cinara pilicornis, have a high SOA-forming potential. A model scenario investigating the effect of a regional, episodic infestation of Cinara pilicornis in Baden-Württemberg, corresponding to a year with high production of forest honey, shows that these types of events could lead to very large organic aerosol formation in the infested region.We have used the best available laboratory data on biotic SIE applicable to northern and central European forests. Using these data and associated assumptions, we have shown that SIE are potentially important for SOA formation but the magnitude of the impact is uncertain and needs to be constrained by further laboratory, field and modelling studies. As an example, the MeSA, which is released as a consequence of various types of biotic stress, is found to have a potentially large impact on SIE-SOA in Europe, but different assumptions regarding the nighttime chemistry of MeSA can change its SOA potential substantially. Thus, further investigations of the atmospheric chemistry of MeSA and observational field studies are needed to clarify the role of this compound in the atmosphere.
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000187507 7001_ $$0P:(DE-HGF)0$$aHallquist, M.$$b1
000187507 7001_ $$0P:(DE-HGF)0$$aSimpson, D.$$b2
000187507 7001_ $$0P:(DE-Juel1)129421$$aWildt, J.$$b3$$ufzj
000187507 7001_ $$0P:(DE-Juel1)16346$$aMentel, Thomas F.$$b4$$eCorresponding Author$$ufzj
000187507 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-14-13643-2014$$gVol. 14, no. 24, p. 13643 - 13660$$n24$$p13643 - 13660$$tAtmospheric chemistry and physics$$v14$$x1680-7324$$y2014
000187507 8564_ $$uwww.atmos-chem-phys.net/14/13643/2014/
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