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| Titel |
The effect of organic compounds on the growth rate of cloud droplets in marine and forest settings |
| VerfasserIn |
N. C. Shantz, W. R. Leaitch, L. Phinney, M. Mozurkewich, D. Toom-Sauntry |
| 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. 19 ; Nr. 8, no. 19 (2008-10-13), S.5869-5887 |
| Datensatznummer |
250006403
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| Publikation (Nr.) |
 copernicus.org/acp-8-5869-2008.pdf |
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| Zusammenfassung |
| Organic matter represents an important fraction of the fine particle aerosol,
yet our knowledge of the roles of organics in the activation of aerosol
particles into cloud droplets is poor. A cloud condensation nucleus (CCN)
counter is used to examine the relative growth rates of cloud droplets for
case studies from field measurements on the North Pacific Ocean and in a
coniferous forest. A model of the condensational growth of water droplets, on
particles dissolving according to their solubility in water, is used to
simulate the initial scattering of the droplets as they grow in the CCN
counter. Simulations of the growth rates of fine particles sampled in the
marine boundary layer of the North Pacific Ocean shows no evidence of natural
marine organic material contributing to the CCN water uptake but there is an
indication of an influence from organics from diesel ship emissions on the
size distribution of sulphate and the ability of these particles to act as
CCN. Simulations of the observations of water uptake on biogenic organic
aerosol particles sampled in a coniferous forest indicate an impact of the
organic on the water uptake rates, but one that is still smaller than that of
pure sulphate. The existence of organics becomes important in determining the
water uptake as the organic mass increases relative to sulphate. The values
of the organic component of the hygroscopicity parameter κ that
describes the CCN activity were found to be negligible for the marine
particles and 0.02–0.05 for the forest particles. |
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