On the effects of hydrocarbon and sulphur-containing compounds on the CCN activation of combustion particles

A. Petzold, M. Gysel, X. Vancassel, R. Hitzenberger, H. Puxbaum, S. Vrochticky, E. Weingartner, U. Baltensperger, P. Mirabel
2005 Atmospheric Chemistry and Physics Discussions  
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. A comprehensive suite of aerosol, gas and chemi-ion measurements were conducted under 5 different combustor operating conditions and fuel sulphur concentrations. Combustion aerosol characterisation included on-line measurements of mass and number concentration,
more » ... mber 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. Modelling of CCN activation of combustion particles was 10 15 the CCN activation of combustion particles was investigated. It was found that particles containing a large fraction of non-volatile organic compounds grow significantly less at high relative humidity than particles with a lower content of non-volatile OC. Also the effect of the non-volatile OC fraction on the potential CCN activation is significant. While a coating of water-soluble sulphuric acid increases the potential CCN 20 activation, or lowers the activation diameter, respectively, the non-volatile organic compounds, mainly found at lower combustion temperatures, can partially compensate this sulphuric acid-related enhancement of CCN activation of carbonaceous combustion aerosol particles. 2600 ACPD Abstract ACPD Abstract ACPD Abstract ACPD Abstract will refer to the carbonaceous compound classes defined above and determined by 2606 ACPD Abstract ACPD Abstract ACPD Abstract 5, 2005
doi:10.5194/acpd-5-2599-2005 fatcat:qcb2f3klevcojdvb7cd5svwo6i