Coating of soot and (NH4)2SO4 particles by ozonolysis products of α-pinene

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Authors
Saathoff, Harald
Naumann, Karl-Heinz
Schnaiter, Martin
Schöck, Werner
Möhler, Ottmar
Schurath, Ulrich
Gysel, Martin
Baltensperger, Urs
Author (Corporation)
Publication date
10/2003
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Type
01A - Journal article
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Parent work
Journal of Aerosol Science
Special issue
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Volume
34
Issue / Number
10
Pages / Duration
1297-1321
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Publisher / Publishing institution
Elsevier
Place of publication / Event location
Amsterdam
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Abstract
The ozonolysis of α-pinene in a large aerosol chamber was used to generate secondary organic aerosol (SOA) mass by homogeneous nucleation, or by heterogeneous nucleation, either on soot, or on (NH4)2SO4 seed aerosols. The rate of the α-pinene + ozone reaction and the aerosol yield of ∼19% are in good agreement with literature data. The organic coating of soot particles leads to a compaction of the fractal agglomerates expressed by an increase in fractal dimension from 1.9 to 2.1 for Diesel soot, and from 2.0 to 2.3 for spark generated “Palas” soot. The dielectric coating of the soot particles with SOA layers between 2 to 11 nm gives rise to a substantial enhancement of their single scattering albedo, from about 0.2 to 0.5, and increases the effective absorption coefficients of both soot types by ca. 30%. The coating of both soot types increases the hygroscopic growth factors (HGF) to values close below the HGF measured for pure SOA material d/d0∼1:12 at 90% RH.
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Subject (DDC)
550 - Geowissenschaften
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ISBN
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0021-8502
Language
English
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No
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Publication status
Published
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Peer review of the complete publication
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Closed
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Citation
SAATHOFF, Harald, Karl-Heinz NAUMANN, Martin SCHNAITER, Werner SCHÖCK, Ottmar MÖHLER, Ulrich SCHURATH, Ernest WEINGARTNER, Martin GYSEL und Urs BALTENSPERGER, 2003. Coating of soot and (NH4)2SO4 particles by ozonolysis products of α-pinene. Journal of Aerosol Science. Oktober 2003. Bd. 34, Nr. 10, S. 1297–1321. DOI 10.1016/s0021-8502(03)00364-1. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46807