Atmos. Chem. Phys. Discuss., 7, 13773-13803, 2007
www.atmos-chem-phys-discuss.net/7/13773/2007/
doi:10.5194/acpd-7-13773-2007
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Hygroscopic growth and activation of HULIS particles: experimental data and a new iterative parameterization scheme for complex aerosol particles
M. Ziese1, H. Wex1, E. Nilsson2, I. Salma3, R. Ocskay3, T. Hennig1, A. Massling1, and F. Stratmann1
1Leibniz-Intitute for Tropospheric Research, Permoser Strasse 15, 04318 Leipzig, Germany
2Lund University, Department of Nuclear Physic, P.O. Box 118, 221 00 Lund, Sweden
3Eötvös University, Institute of Chemistry, P.O. Box 32, 1518 Budapest, Hungary

Abstract. The hygroscopic growth and activation of two HULIS and one Aerosol-Water-Extract sample, prepared from urban-type aerosol, were investigated. All samples were extracted from filters, redissolved in water and atomized for the investigations presented here. The hygroscopic growth measurements were done using LACIS (Leipzig Aerosol Cloud Interaction Simulator) together with a HH-TDMA (High Humidity Tandem Differential Mobility Analyzer). Hygroscopic growth was determined for relative humidities up to 99.75%. The critical diameters for activation were measured using LACIS for supersaturations between 2 and 10 per mill. All three samples showed a similar hygroscopic growth behaviour, and the two HULIS samples also were similar in their activation behavior, while the Aerosol-Water-Extract turned out to be more CCN active than the HULIS samples. The experimental data was used to derive parameterizations for the hygroscopic growth and activation of HULIS particles. The concept of ρion (Wex et al., 2007a) and the Szyszkowski-equation (Szyszkowski, 1908; Facchini et al., 1999) were used for parameterizing the Raoult and the Kelvin (surface tension) terms of the Köhler equation, respectively. This concept proved to be very successful for the HULIS samples in the saturation range from relative humidities larger than 98% up to activation. However it failed for the Aerosol-Water extract.

Citation: Ziese, M., Wex, H., Nilsson, E., Salma, I., Ocskay, R., Hennig, T., Massling, A., and Stratmann, F.: Hygroscopic growth and activation of HULIS particles: experimental data and a new iterative parameterization scheme for complex aerosol particles, Atmos. Chem. Phys. Discuss., 7, 13773-13803, doi:10.5194/acpd-7-13773-2007, 2007.
 
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