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| Titel |
Free amino acids in Antarctic aerosol: potential markers for the evolution and fate of marine aerosol |
| VerfasserIn |
E. Barbaro, R. Zangrando, M. Vecchiato, R. Piazza, W. R. L. Cairns, G. Capodaglio, 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 ; 15, no. 10 ; Nr. 15, no. 10 (2015-05-20), S.5457-5469 |
| Datensatznummer |
250119736
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| Publikation (Nr.) |
 copernicus.org/acp-15-5457-2015.pdf |
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| Zusammenfassung |
To investigate the impact of marine aerosols on global climate change it is
important to study their chemical composition and size distribution. Amino
acids are a component of the organic nitrogen in aerosols and particles
containing amino acids have been found to be efficient ice nuclei.
The main aim of this study was to investigate the L- and D-free amino acid
composition as possible tracers of primary biological production in Antarctic
aerosols from three different areas: two continental bases, Mario Zucchelli
Station (MZS) on the coast of the Ross Sea, Concordia Station at Dome C on
the Antarctic Plateau, and the Southern Ocean near the Antarctic continent.
Studying the size distribution of amino acids in aerosols allowed us to
characterize this component of the water-soluble organic carbon (WSOC) in
marine aerosols near their source and after long-range transport. The
presence of only free L-amino acids in our samples is indicative of the
prevalence of phytoplanktonic material. Sampling at these three points
allowed us to study the reactivity of these compounds during long-range
transport.
The mean total amino acid concentration detected at MZS was
11 pmol m−3, a higher percentage of amino acids were found in the fine
fraction. The aerosol samples collected at Dome C had the lowest amino acid
values (0.7 and 0.8 pmol m−3), and the coarse particles were found to
have higher concentrations of amino acids compared to the coastal site. The
amino acid composition in the aerosol collected at Dome C had also changed
compared to the coastal site, suggesting that physical and chemical
transformations had occurred during long range transport.
During the sampling cruise on the R/V Italica on the Southern Ocean,
high concentrations of amino acids were found in the total suspended
particles, this we attribute to the presence of intact biological material
(as microorganisms or plant material) in the sample. |
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