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| Titel |
On the contribution of Aitken mode particles to cloud droplet populations at continental background areas – a parametric sensitivity study |
| VerfasserIn |
T. Anttila, V.-M. Kerminen |
| 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 ; 7, no. 17 ; Nr. 7, no. 17 (2007-09-12), S.4625-4637 |
| Datensatznummer |
250005188
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| Publikation (Nr.) |
 copernicus.org/acp-7-4625-2007.pdf |
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| Zusammenfassung |
| Aitken mode particles are potentially an important source
of cloud droplets in continental background areas. In order to find out
which physico-chemical properties of Aitken mode particles are most
important regarding their cloud-nucleating ability, we calculated the number
of cloud droplets formed on Aitken mode particles, CD2, with an adiabatic
air parcel model. The model output was analyzed using a global sensitivity
analysis method that quantifies and ranks the relative importance of the
considered input parameters to the total variance of CD2. The results
show that unless the particle surface tension or the mass accommodation
coefficient of water is strongly reduced due to the presence of
surface-active organics, the parameters describing the size distribution are
generally more important than the particle chemical composition. In the
absence of such compounds, the chemical composition may have roughly an
equal importance with the size distribution only at low updraft velocities
characterized by maximum supersaturations below 0.1%. Furthermore, the
largest source of variability is generally the particle number
concentration, followed by the particle size. The performed sensitivity
analysis revealed that the variability of the particle chemical composition
may dominate the total variation of CD2 if: 1) the value of α varies at
least one order of magnitude more than what is expected for pure water
surfaces (10−2–1), or 2) the particle surface tension varies more than
roughly 30% under conditions close to reaching saturation. |
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