 |
| Titel |
High formation of secondary organic aerosol from the photo-oxidation of toluene |
| VerfasserIn |
L. Hildebrandt, N. M. Donahue, S. N. Pandis |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 9 ; Nr. 9, no. 9 (2009-05-07), S.2973-2986 |
| Datensatznummer |
250007266
|
| Publikation (Nr.) |
 copernicus.org/acp-9-2973-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| Toluene and other aromatics have long been viewed as the dominant
anthropogenic secondary organic aerosol (SOA) precursors, but the SOA mass
yields from toluene reported in previous studies vary widely. Experiments
conducted in the Carnegie Mellon University environmental chamber to study
SOA formation from the photo-oxidation of toluene show significantly larger
SOA production than parameterizations employed in current air-quality
models. Aerosol mass yields depend on experimental conditions: yields are
higher under higher UV intensity, under low-NOx conditions and at lower
temperatures. The extent of oxidation of the aerosol also varies with
experimental conditions, consistent with ongoing, progressive photochemical
aging of the toluene SOA. Measurements using a thermodenuder system suggest
that the aerosol formed under high- and low-NOx conditions is
semi-volatile. These results suggest that SOA formation from toluene depends
strongly on ambient conditions. An approximate parameterization is proposed
for use in air-quality models until a more thorough treatment accounting for
the dynamic nature of this system becomes available. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|