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| Titel |
Hygroscopic growth and activation of HULIS particles: experimental data and a new iterative parameterization scheme for complex aerosol particles |
| VerfasserIn |
M. Ziese, H. Wex, E. Nilsson, I. Salma, R. Ocskay, T. Hennig, A. Maßling, F. Stratmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 6 ; Nr. 8, no. 6 (2008-03-28), S.1855-1866 |
| Datensatznummer |
250005944
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| Publikation (Nr.) |
 copernicus.org/acp-8-1855-2008.pdf |
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| Zusammenfassung |
| The hygroscopic growth and activation of two HULIS (HUmic LIke
Substance) 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 (RHs) up to 99.75%. The critical
diameters for activation were measured for supersaturations
between 0.2 and 1%. All three samples showed a similar
hygroscopic growth behavior, 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, 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 RHs larger than 98% up to activation. It
was also shown to work well with data on HULIS taken from
literature. Here, different atmospheric life-times and/or
different sources for the different samples showed up in different
coefficients for the parameterization. However, the
parameterization did not work out well for the Aerosol-Water-Extract. |
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