Journal Article

FZJ-2015-00638

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Parameterization of Thermal Properties of Aging Secondary Organic Aerosol Produced by Photo-Oxidation of Selected Terpene Mixtures

Emanuelsson, E. U. ; Mentel, T. F.FZJ* ; Watne, Å. K. ; Spindler, C. ; Bohn, B.FZJ* ; Brauers, T.FZJ* ; Dorn, H.-P.FZJ* ; Hallquist, Å. M. ; Häseler, R.FZJ* ; Kiendler-Scharr, A.FZJ* ; Müller, K. P. ; Pleijel, H. ; Rohrer, F.FZJ* ; Rubach, F. ; Schlosser, E.FZJ* ; Tillmann, R.FZJ* ; Hallquist, M. (Corresponding Author)

2014
American Chemical Society Columbus, Ohio

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Please use a persistent id in citations: doi:10.1021/es405412p

Abstract: Formation and evolution of secondary organic aerosols (SOA) from biogenic VOCs influences the Earth’s radiative balance. We have examined the photo-oxidation and aging of boreal terpene mixtures in the SAPHIR simulation chamber. Changes in thermal properties and chemical composition, deduced from mass spectrometric measurements, were providing information on the aging of biogenic SOA produced under ambient solar conditions. Effects of precursor mixture, concentration, and photochemical oxidation levels (OH exposure) were evaluated. OH exposure was found to be the major driver in the long term photochemical transformations, i.e., reaction times of several hours up to days, of SOA and its thermal properties, whereas the initial concentrations and terpenoid mixtures had only minor influence. The volatility distributions were parametrized using a sigmoidal function to determine TVFR0.5 (the temperature yielding a 50% particle volume fraction remaining) and the steepness of the volatility distribution. TVFR0.5 increased by 0.3 ± 0.1% (ca. 1 K), while the steepness increased by 0.9 ± 0.3% per hour of 1 × 106 cm–3 OH exposure. Thus, aging reduces volatility and increases homogeneity of the vapor pressure distribution, presumably because highly volatile fractions become increasingly susceptible to gas phase oxidation, while less volatile fractions are less reactive with gas phase OH.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. 233 - Trace gas and aerosol processes in the troposphere (POF2-233) (POF2-233)

Appears in the scientific report 2014

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Database coverage:
; BIOSIS Previews ; Current Contents - Agriculture, Biology and Environmental Sciences ; Current Contents - Engineering, Computing and Technology ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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