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| Titel |
Organic molecular composition of marine aerosols over the Arctic Ocean in summer: contributions of primary emission and secondary aerosol formation |
| VerfasserIn |
P. Q. Fu, K. Kawamura, J. Chen, B. Charrière, R. Sempéré |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-01), S.653-667 |
| Datensatznummer |
250017494
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| Publikation (Nr.) |
 copernicus.org/bg-10-653-2013.pdf |
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| Zusammenfassung |
| Organic molecular composition of marine aerosol samples collected during the
MALINA cruise in the Arctic Ocean was investigated by gas
chromatography/mass spectrometry. More than 110 individual organic compounds
were determined in the samples and were grouped into different compound
classes based on the functionality and sources. The concentrations of total
quantified organics ranged from 7.3 to 185 ng m−3 (mean 47.6 ng m−3),
accounting for 1.8–11.0% (4.8%) of organic carbon in
the marine aerosols. Primary saccharides were found to be dominant organic
compound class, followed by secondary organic aerosol (SOA) tracers formed
from the oxidation of biogenic volatile organic compounds (VOCs) such as
isoprene, α-pinene and β-caryophyllene. Mannitol, the
specific tracer for airborne fungal spores, was detected as the most
abundant organic species in the samples with a concentration range of
0.052–53.3 ng m−3 (9.2 ng m−3), followed by glucose,
arabitol, and the isoprene oxidation products of 2-methyltetrols. Biomass
burning tracers such as levoglucosan are evident in all samples with trace
levels. On the basis of the tracer-based method for the estimation of
fungal-spore OC and biogenic secondary organic carbon (SOC), we estimate
that an average of 10.7% (up to 26.2%) of the OC in the marine
aerosols was due to the contribution of fungal spores, followed by the
contribution of isoprene SOC (mean 3.8%) and α-pinene SOC
(2.9%). In contrast, only 0.19% of the OC was due to the
photooxidation of β-caryophyllene. This study indicates that primary
organic aerosols from biogenic emissions, both from long-range transport of
mid-latitude aerosols and from sea-to-air emission of marine organics, as
well as secondary organic aerosols formed from the photooxidation of
biogenic VOCs are important factors controlling the organic chemical
composition of marine aerosols in the Arctic Ocean. |
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