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| Titel |
Amino acids in Arctic aerosols |
| VerfasserIn |
E. Scalabrin, R. Zangrando, E. Barbaro, N. M. Kehrwald, J. Gabrieli, C. Barbante, A. Gambaro |
| 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 ; 12, no. 21 ; Nr. 12, no. 21 (2012-11-08), S.10453-10463 |
| Datensatznummer |
250011576
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| Publikation (Nr.) |
 copernicus.org/acp-12-10453-2012.pdf |
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| Zusammenfassung |
| Amino acids are significant components of atmospheric aerosols, affecting
organic nitrogen input to marine ecosystems, atmospheric radiation balance,
and the global water cycle. The wide range of amino acid reactivities suggest
that amino acids may serve as markers of atmospheric transport and deposition
of particles. Despite this potential, few measurements have been conducted in
remote areas to assess amino acid concentrations and potential sources. Polar
regions offer a unique opportunity to investigate atmospheric processes and
to conduct source apportionment studies of such compounds. In order to better
understand the importance of amino acid compounds in the global atmosphere,
we determined free amino acids (FAAs) in seventeen size-segregated aerosol
samples collected in a polar station in the Svalbard Islands from 19 April
until 14 September 2010. We used an HPLC coupled with a tandem mass
spectrometer (ESI-MS/MS) to analyze 20 amino acids and quantify compounds at
fmol m−3 levels. Mean total FAA concentration was 1070 fmol m−3
where serine and glycine were the most abundant compounds in almost all
samples and accounted for 45–60% of the total amino acid relative
abundance. The other eighteen compounds had average concentrations between
0.3 and 98 fmol m−3. The higher amino acid concentrations were present
in the ultrafine aerosol fraction (< 0.49 μm) and accounted for
the majority of the total amino acid content. Local marine sources dominate
the boreal summer amino acid concentrations, with the exception of the
regional input from Icelandic volcanic emissions. |
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