 |
| Titel |
A simple representation of surface active organic aerosol in cloud droplet formation |
| VerfasserIn |
N. L. Prisle, M. Maso, H. Kokkola |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 9 ; Nr. 11, no. 9 (2011-05-04), S.4073-4083 |
| Datensatznummer |
250009689
|
| Publikation (Nr.) |
 copernicus.org/acp-11-4073-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| Atmospheric aerosols often contain surface active organics. Surface activity can affect
cloud droplet formation through both surface partitioning and surface tension reduction in
activating droplets. However, a comprehensive thermodynamic account for these effects in
Köhler modeling is computationally demanding and requires knowledge of both droplet
composition and component molecular properties, which is generally unavailable. Here,
a simple representation of activation properties for surface active organics is introduced
and compared against detailed model predictions and laboratory measurements of CCN activity
for mixed surfactant-salt particles from the literature. This simple organic representation
is seen to work well for aerosol organic-inorganic composition ranges typically found in the
atmosphere, and agreement with both experiments and detailed model predictions increases
with surfactant strength. The simple representation does not require resolution of the
organic aerosol composition and relies solely on properties of the organic fraction that can
be measured directly with available techniques. It can thus potentially be applied to complex
and ambient surface active aerosols. It is not computationally demanding, and therefore has high
potential for implementation to atmospheric models accounting for cloud microphysics. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|