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| Titel |
Cloud condensation nucleus (CCN) behavior of organic aerosol particles generated by atomization of water and methanol solutions |
| VerfasserIn |
T. A. Rissman, V. Varutbangkul, J. D. Surratt, D. O. Topping, G. McFiggans, R. C. Flagan, J. H. Seinfeld |
| 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. 11 ; Nr. 7, no. 11 (2007-06-12), S.2949-2971 |
| Datensatznummer |
250005041
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| Publikation (Nr.) |
 copernicus.org/acp-7-2949-2007.pdf |
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| Zusammenfassung |
| Cloud condensation nucleus (CCN) experiments were carried out for malonic
acid, succinic acid, oxalacetic acid, DL-malic acid, glutaric acid,
DL-glutamic acid monohydrate, and adipic acid, using both water and methanol
as atomization solvents, at three operating supersaturations (0.11%,
0.21%, and 0.32%) in the Caltech three-column CCN instrument (CCNC3).
Predictions of CCN behavior for five of these compounds were made using the
Aerosol Diameter Dependent Equilibrium Model (ADDEM). The experiments
presented here expose important considerations associated with the
laboratory measurement of the CCN behavior of organic compounds. Choice of
atomization solvent results in significant differences in CCN activation for
some of the compounds studied, which could result from residual solvent,
particle morphology differences, and chemical reactions between the particle
and gas phases. Also, significant changes in aerosol size distribution
occurred after classification in a differential mobility analyzer (DMA) for
malonic acid and glutaric acid, preventing confident interpretation of
experimental data for these two compounds. Filter analysis of adipic acid
atomized from methanol solution indicates that gas-particle phase reactions
may have taken place after atomization and before methanol was removed from
the sample gas stream. Careful consideration of these experimental issues is
necessary for successful design and interpretation of laboratory CCN
measurements. |
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