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| Titel |
Chemical ageing and transformation of diffusivity in semi-solid multi-component organic aerosol particles |
| VerfasserIn |
C. Pfrang, M. Shiraiwa, U. Pöschl |
| 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 ; 11, no. 14 ; Nr. 11, no. 14 (2011-07-26), S.7343-7354 |
| Datensatznummer |
250009950
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| Publikation (Nr.) |
 copernicus.org/acp-11-7343-2011.pdf |
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| Zusammenfassung |
| Recent experimental evidence underlines the importance of reduced
diffusivity in amorphous semi-solid or glassy atmospheric aerosols. This
paper investigates the impact of diffusivity on the ageing of
multi-component reactive organic particles approximating atmospheric cooking
aerosols. We apply and extend the recently developed KM-SUB model in a study
of a 12-component mixture containing oleic and palmitoleic acids. We
demonstrate that changes in the diffusivity may explain the evolution of
chemical loss rates in ageing semi-solid particles, and we resolve surface
and bulk processes under transient reaction conditions considering
diffusivities altered by oligomerisation. This new model treatment allows
prediction of the ageing of mixed organic multi-component aerosols over
atmospherically relevant timescales and conditions. We illustrate the impact
of changing diffusivity on the chemical half-life of reactive components in
semi-solid particles, and we demonstrate how solidification and crust
formation at the particle surface can affect the chemical transformation of
organic aerosols. |
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