 |
| Titel |
Linking biogenic hydrocarbons to biogenic aerosol in the Borneo rainforest |
| VerfasserIn |
J. F. Hamilton, M. R. Alfarra, N. Robinson, M. W. Ward, A. C. Lewis, G. B. McFiggans, H. Coe, J. D. Allan |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 22 ; Nr. 13, no. 22 (2013-11-21), S.11295-11305 |
| Datensatznummer |
250085827
|
| Publikation (Nr.) |
 copernicus.org/acp-13-11295-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Emissions of biogenic volatile organic compounds are though to contribute
significantly to secondary organic aerosol formation in the tropics, but
understanding these transformation processes has proved difficult, due to
the complexity of the chemistry involved and very low concentrations.
Aerosols from above a Southeast Asian tropical rainforest in Borneo were
characterised using liquid chromatography–ion trap mass spectrometry, high-resolution aerosol mass spectrometry and Fourier transform ion cyclotron
resonance mass spectrometry (FTICRMS) techniques. Oxygenated compounds were
identified in ambient organic aerosol that could be directly traced back to
isoprene, monoterpenes and sesquiterpene emissions, by combining field data
on chemical structures with mass spectral data generated from synthetically
produced products created in a simulation chamber. Eighteen oxygenated
species of biogenic origin were identified in the rainforest aerosol from
the precursors isoprene, α-pinene, limonene, α-terpinene and
β-caryophyllene. The observations provide the unambiguous field
detection of monoterpene and sesquiterpene oxidation products in SOA above a
pristine tropical rainforest. The presence of 2-methyl tetrol organosulfates
and an associated sulfated dimer provides direct evidence that isoprene in
the presence of sulfate aerosol can make a contribution to biogenic organic
aerosol above tropical forests. High-resolution mass spectrometry indicates
that sulfur can also be incorporated into oxidation products arising from
monoterpene precursors in tropical aerosol. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|