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| Titel |
Evidence for a significant proportion of Secondary Organic Aerosol from isoprene above a maritime tropical forest |
| VerfasserIn |
N. H. Robinson, J. F. Hamilton, J. D. Allan, B. Langford, D. E. Oram, Q. Chen, K. Docherty, D. K. Farmer, J. L. Jimenez, M. W. Ward, C. N. Hewitt, M. H. Barley, M. E. Jenkin, A. R. Rickard, S. T. Martin, G. McFiggans, H. Coe |
| 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. 3 ; Nr. 11, no. 3 (2011-02-04), S.1039-1050 |
| Datensatznummer |
250009290
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| Publikation (Nr.) |
 copernicus.org/acp-11-1039-2011.pdf |
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| Zusammenfassung |
| Isoprene is the most abundant non-methane biogenic volatile organic compound
(BVOC), but the processes governing secondary organic aerosol (SOA) formation
from isoprene oxidation are only beginning to become understood and selective
quantification of the atmospheric particulate burden remains difficult.
Organic aerosol above a tropical rainforest located in Danum Valley, Borneo,
Malaysia, a high isoprene emission region, was studied during Summer 2008
using Aerosol Mass Spectrometry and offline detailed characterisation using
comprehensive two dimensional gas chromatography. Observations indicate that
a substantial fraction (up to 15% by mass) of atmospheric sub-micron
organic aerosol was observed as methylfuran (MF) after thermal desorption.
This observation was associated with the simultaneous measurements of
established gas-phase isoprene oxidation products methylvinylketone (MVK) and
methacrolein (MACR). Observations of MF were also made during experimental
chamber oxidation of isoprene. Positive matrix factorisation of the AMS
organic mass spectral time series produced a robust factor which accounts for
an average of 23% (0.18 μg m−3), reaching as much as
53% (0.50 μg m−3) of the total oraganic loading,
identified by (and highly correlated with) a strong MF signal. Assuming that
this factor is generally representative of isoprene SOA, isoprene derived
aerosol plays a significant role in the region. Comparisons with measurements
from other studies suggest this type of isoprene SOA plays a role in other
isoprene dominated environments, albeit with varying significance. |
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