The influence of aerosol particle composition on cloud droplet formation |
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| Authors: | A Hallberg J A Ogren K J Noone K Okada J Heintzenberg I B Svenningsson |
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| Institution: | (1) Department of Meteorology, Stockholm University, 106 91 Stockholm, Sweden;(2) Meteorological Research Institute, 305 Tsukuba, Ibaraki, Japan;(3) Department of Nuclear Physics, University of Lund, 223 62 Lund, Sweden;(4) Present address: NOAA/CMDL/R/E/CG, 325 Broadway, 80303-3328 Boulder, CO, USA;(5) Present address: Center for Atmospheric Chemistry Studies, Graduate School of Oceanography, 02882-1197 Narragansett, RI, USA;(6) Present address: Institut für Tropospherenforschung e.V., Permoserstrasse 15, D-04303 Leipzig, Germany |
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| Abstract: | A difference in partitioning between cloud droplets and interstitial air for two chemical species (elemental carbon and sulphur) with different expected behaviour in nucleation scavenging was observed in clouds at Mt. Kleiner Feldberg (825 m asl), near Frankfurt, Germany. The fraction of sulphur incorporated in cloud droplets was always higher than the fraction of elemental carbon. This difference in partitioning has also been observed in fog but under different pollution conditions in the Po Valley, Italy. Both these studies were based on bulk samples. In the present study at Kleiner Feldberg, impactor samples of the particles in the interstitial air and the cloud droplet residuals were taken and a single particle analysis was done on the samples. It was found that, for a given particle size, the majority of particles forming cloud droplets were soluble and that insoluble particles preferentially remained in the interstitial air. |
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| Keywords: | Partitioning sulphur elemental carbon nucleation scavenging single particle analysis |
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