Journal Article

PreJuSER-12512

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The chemical and microphysical properties of secondary organic aerosols from Holm Oak emissions

Lang-Yona, N. ; Rudich, Y. ; Mentel, T. F.FZJ* ; Bohne, A. ; Buchholz, A.FZJ* ; Kiendler-Scharr, A.FZJ* ; Kleist, E.FZJ* ; Spindler, C.FZJ* ; Tillmann, R.FZJ* ; Wildt, J.FZJ*

2010
EGU Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/7260  doi:10.5194/acp-10-7253-2010

Abstract: The Mediterranean region is expected to experience substantial climatic change in the next 50 years. But, possible effects of climate change on biogenic volatile organic compound (VOC) emissions as well as on the formation of secondary organic aerosols (SOA) produced from these VOC are yet unexplored. To address such issues, the effects of temperature on the VOC emissions of Mediterranean Holm Oak and small Mediterranean stand of Wild Pistacio, Aleppo Pine, and Palestine Oak have been studied in the Julich plant aerosol atmosphere chamber. For Holm Oak the optical and microphysical properties of the resulting SOA were investigated.Monoterpenes dominated the VOC emissions from Holm Oak (97.5%) and Mediterranean stand (97%). Higher temperatures enhanced the overall VOC emission but with different ratios of the emitted species. The amount of SOA increased linearly with the emission strength with a fractional mass yield of 6.0+/-0.6%, independent of the detailed emission pattern. The investigated particles were highly scattering with no absorption abilities. Their average hygroscopic growth factor of 1.13+/-0.03 at 90% RH with a critical diameter of droplet activation was 100+/-4 nm at a supersaturation of 0.4%. All microphysical properties did not depend on the detailed emission pattern, in accordance with an invariant O/C ratio (0.57(+0.03/-0.1)) of the SOA observed by high resolution aerosol mass spectrometry.The increase of Holm oak emissions with temperature (approximate to 20% per degree) was stronger than e.g. for Boreal tree species (approximate to 10% per degree). The SOA yield for Mediterranean trees determined here is similar as for Boreal trees. Increasing mean temperature in Mediterranean areas could thus have a stronger impact on BVOC emissions and SOA formation than in areas with Boreal forests.

Keyword(s): J

Note: We gratefully acknowledge the support by the European Commission (IP-EUCAARI, Contract No. 036833-2, by the ESF (INTROP) and by the Israel Science Foundation (grants 1527/07 and 196/08). Yinon Rudich acknowledges financial support by the Helen and Martin Kimmel Award for Innovative Investigation.

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Research Program(s):

1. Atmosphäre und Klima (P23)

Appears in the scientific report 2010

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