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On the Effects of Organic Matter and Sulphur-containing Compounds on the CCN Activation of Combustion Particles

Petzold, Andreas and Gysel, Martin and Vancassel, Xavier and Hitzenberger, Regina and Puxbaum, Hans and Vrochticky, Susanne and Weingartner, Ernest and Baltensperger, Urs and Mirabel, Philippe (2005) On the Effects of Organic Matter and Sulphur-containing Compounds on the CCN Activation of Combustion Particles. Atmospheric Chemistry and Physics, 5, pp. 3187-3203.

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Official URL: http://www.atmos-chem-phys.org/acp/5/3187/

Abstract

The European PartEmis project (Measurement and prediction of emissions of aerosols and gaseous precursors from gas turbine engines) was focussed on the characterisation and quantification of exhaust emissions from a gas turbine engine. The combustion aerosol characterisation included on-line measurements of mass and number concentration, size distribution, mixing state, thermal stability of internally mixed particles, hygroscopicity, cloud condensation nuclei (CCN) activation potential, and off-line analysis of chemical composition. Based on this extensive data set, the role of sulphuric acid coating and of the organic fraction of the combustion particles for the CCN activation was investigated. Modelling of CCN activation was conducted using microphysical and chemical properties obtained from the measurements as input data. Coating the combustion particles with water-soluble sulphuric acid, increases the potential CCN activation, or lowers the activation diameter, respectively. The adaptation of a Koehler model to the experimental data yielded coatings from 0.1 to 3 vol-% of water-soluble matter, which corresponds to an increase in the fraction of CCN-activated combustion particles from 10<sup>−4</sup> to 10<sup>−2</sup> at a water vapour saturation ratio S<sub>w</sub> = 1.006. Additional particle coating by coagulation of combustion particles and aqueous sulphuric acid particles formed by nucleation further reduces the CCN activation diameter. In contrast, particles containing a large fraction of non-volatile organic ompounds grow significantly less at high relative humidity than particles with a lower content of non-volatile OC. The resulting reduction in the potential CCN activation with an increasing fraction of non-volatile OC becomes visible as a trend in the experimental data. While a coating of water-soluble sulphuric acid increases the potential CCN activation, or lowers the activation diameter, respectively, the non-volatile organic compounds, mainly found at lower ombustion temperatures, can partially compensate this sulphuric acid-related enhancement of CCN activation of carbonaceous combustion aerosol particles.

Document Type:Article
Title:On the Effects of Organic Matter and Sulphur-containing Compounds on the CCN Activation of Combustion Particles
Authors:
AuthorsInstitution or Email of Authors
Petzold, AndreasUNSPECIFIED
Gysel, MartinUniv. of Manchester, Manchester, UK
Vancassel, XavierUniv. of Oxford, Oxford, UK
Hitzenberger, ReginaUniv. of Vienna, Wien, A
Puxbaum, HansVienna Univ. of Technology, Wien, A
Vrochticky, SusanneVienna Univ. of Technology, Wien, A
Weingartner, ErnestPaul Scherrer Inst., Villigen, CH
Baltensperger, UrsPaul Scherrer Inst., Villigen, CH
Mirabel, PhilippeUniv. Louis Pasteur, Strasbourg, F
Date:December 2005
Journal or Publication Title:Atmospheric Chemistry and Physics
Volume:5
Page Range:pp. 3187-3203
Status:Published
Keywords:combustion aerosol, aircraft emissions, CCN, aerosol measurement, PARTEMIS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Andreas Petzold
Deposited On:24 Jul 2007
Last Modified:12 Dec 2013 20:08

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