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Title:Investigating the use of secondary organic aerosol as seed particles in simulation chamber experiments
Authors:Hamilton, Jaqueline F (Author)
Alfarra, M Rami (Author)
Wyche, Kevin P (Author)
Ward, Martyn W (Author)
Lewis, Alistair C (Author)
McFiggans, Gordon B (Author)
Good, Nicholas (Author)
Monks, Paul S (Author)
Carr, Timo (Author)
White, Iain R (Author)
Purvis, Ruth M (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The use of β-caryophyllene secondary organic aerosol particles as seeds for smog chamber simulations has been investigated. A series of experiments were carried out in the Manchester photochemical chamber as part of the Aerosol Coupling in the Earth System (ACES) project to study the effect of seed particles on the formation of secondary organic aerosol (SOA) from limonene photo-oxidation. Rather than use a conventional seed aerosol containing ammonium sulfate or diesel particles, a method was developed to use in-situ chamber generated seed particles from β-caryophyllene photo-oxidation, which were then diluted to a desired mass loading (in this case 4-13 μg m-3). Limonene was then introduced into the chamber and oxidised, with the formation of SOA seen as a growth in the size of oxidised organic seed particles from 150 to 325 nm mean diameter. The effect of the partitioning of limonene oxidation products onto the seed aerosol was assessed using aerosol mass spectrometry during the experiment and the percentage of m/z 44, an indicator of degree of oxidation, increased from around 5 to 8 %. The hygroscopicity of the aerosol also changed, with the growth factor for 200 nm particles increasing from less than 1.05 to 1.25 at 90 % RH. The detailed chemical composition of the limonene SOA could be extracted from the complex β-caryophyllene matrix using two-dimensional gas chromatography (GC× GC) and liquid chromatography coupled to mass spectrometry. High resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS) was used to determine exact molecular formulae of the seed and the limonene modified aerosol. The average O:C ratio was seen to increase from 0.32 to 0.37 after limonene oxidation products had condensed onto the organic seed.
Keywords:Aerosol, Aerosol formation, Smog chamber
Year of publishing:2011
Number of pages:5917-5929
Numbering:11, 12
COBISS_ID:5420027 Link is opened in a new window
URN:URN:SI:UNG:REP:ZGVE9AP9
DOI:10.5194/acp-11-5917-2011 Link is opened in a new window
License:CC BY-SA 4.0
This work is available under this license: Creative Commons Attribution Share Alike 4.0 International
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Record is a part of a journal

Title:Atmospheric Chemistry and Physics
Shortened title:Atmos. Chem. Phys.
Publisher:Copernicus
ISSN:16807316
Year of publishing:2011

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