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| Titel |
Aerosol composition and sources in the central Arctic Ocean during ASCOS |
| VerfasserIn |
R. Y.-W. Chang, C. Leck, M. Graus, M. Müller, J. Paatero, J. F. Burkhart, A. Stohl, L. H. Orr, K. Hayden, S.-M. Li, A. Hansel, M. Tjernström, W. R. Leaitch, J. P. D. Abbatt |
| 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. 20 ; Nr. 11, no. 20 (2011-10-27), S.10619-10636 |
| Datensatznummer |
250010147
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| Publikation (Nr.) |
 copernicus.org/acp-11-10619-2011.pdf |
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| Zusammenfassung |
| Measurements of submicron aerosol chemical composition were made over the
central Arctic Ocean from 5 August to 8 September 2008 as a part of the
Arctic Summer Cloud Ocean Study (ASCOS) using an aerosol mass spectrometer
(AMS). The median levels of sulphate and organics for the entire study were
0.051 and 0.055 μ g m−3, respectively. Positive matrix
factorisation was performed on the entire mass spectral time series and this
enabled marine biogenic and continental sources of particles to be separated.
These factors accounted for 33% and 36% of the sampled ambient aerosol
mass, respectively, and they were both predominantly composed of sulphate,
with 47% of the sulphate apportioned to marine biogenic sources and 48%
to continental sources, by mass. Within the marine biogenic factor, the ratio
of methane sulphonate to sulphate was 0.25 ± 0.02, consistent with
values reported in the literature. The organic component of the continental
factor was more oxidised than that of the marine biogenic factor, suggesting
that it had a longer photochemical lifetime than the organics in the marine
biogenic factor. The remaining ambient aerosol mass was apportioned to an
organic-rich factor that could have arisen from a combination of marine and
continental sources. In particular, given that the factor does not correlate
with common tracers of continental influence, we cannot rule out that the
organic factor arises from a primary marine source. |
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