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| Titel |
Seasonal variation of aliphatic amines in marine sub-micrometer particles at the Cape Verde islands |
| VerfasserIn |
C. Müller, Y. Iinuma, J. Karstensen, D. Pinxteren, S. Lehmann, T. Gnauk, H. Herrmann |
| 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 ; 9, no. 24 ; Nr. 9, no. 24 (2009-12-21), S.9587-9597 |
| Datensatznummer |
250007810
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| Publikation (Nr.) |
 copernicus.org/acp-9-9587-2009.pdf |
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| Zusammenfassung |
| Monomethylamine (MA), dimethylamine (DMA) and diethylamine (DEA) were
detected at non-negligible concentrations in sub-micrometer particles at
the Cap Verde Atmospheric Observatory (CVAO) located on the island of
São Vicente in Cape Verde during algal blooms in 2007. The
concentrations of these amines in five stage impactor samples ranged from 0–30 pg m−3 for MA, 130–360 pg m−3
for DMA and 5–110 pg m−3 for DEA during the spring bloom in May 2007 and 2–520 pg m−3 for MA, 100–1400 pg m−3 for
DMA and 90–760 pg m−3 for DEA during an unexpected winter algal bloom in
December 2007. Anomalously high Saharan dust deposition and intensive ocean
layer deepening were found at the Atmospheric Observatory and the associated
Ocean Observatory during algal bloom periods. The highest amine
concentrations in fine particles (impactor stage 2, 0.14–0.42 μm)
indicate that amines are likely taken up from the gas phase into the acidic
sub-micrometer particles. The contribution of amines to the organic
carbon (OC) content ranged from 0.2–2.5% C in the winter months,
indicating the importance of this class of compounds to the carbon cycle in
the marine environment. Furthermore, aliphatic amines originating from
marine biological sources likely contribute significantly to the nitrogen
content in the marine atmosphere. The average contribution of the amines to
the detected nitrogen species in sub-micrometer particles can be
non-negligible, especially in the winter months (0.1% N–1.5% N in the
sum of nitrate, ammonium and amines). This indicates that these smaller
aliphatic amines can be important for the carbon and the nitrogen cycles in
the remote marine environment. |
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