 |
| Titel |
Applying the Condensation Particle Counter Battery (CPCB) to study the water-affinity of freshly-formed 2–9 nm particles in boreal forest |
| VerfasserIn |
I. Riipinen, H. E. Manninen, T. Yli-Juuti, M. Boy, M. Sipilä, M. Ehn, H. Junninen, T. Petäjä, M. Kulmala  |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 10 ; Nr. 9, no. 10 (2009-05-25), S.3317-3330 |
| Datensatznummer |
250007303
|
| Publikation (Nr.) |
 copernicus.org/acp-9-3317-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| Measurements on the composition of nanometer-sized atmospheric particles are
the key to understand which vapors participate in the secondary aerosol
formation processes. Knowledge on these processes is crucial in assessing
the climatic effects of secondary aerosol formation. We present data of >2 nm particle concentrations and their water-affinity measured with the
Condensation Particle Counter Battery (CPCB) at a boreal forest site in
Hyytiälä, Finland, during spring 2006. The data reveal that during
new particle formation events, the smallest particles activate for growth at
clearly smaller sizes in water than in butanol vapor. However, even at 2–4 nm, there are days when the particles seem to be less hygroscopic than
ammonium sulfate or sulfuric acid, which are often referred to as the most
likely compounds present in atmospheric nucleation. This observation points
to the possible presence of water-soluble organics, even at the very first
steps on particle formation. The water-affinity of the particles decreases
with size, indicating that the vapors that participate in the first steps of
the particle formation and growth are more hygroscopic than the vapors
contributing to the later stages of the growth. This suggests that the
relative role of less hygroscopic organics in atmospheric particle growth
increases as a function of particle size. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|