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| Titel |
Low-molecular-weight hydroxyacids in marine atmospheric aerosol: evidence of a marine microbial origin |
| VerfasserIn |
Y. Miyazaki, M. Sawano, K. Kawamura |
| 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 ; 11, no. 16 ; Nr. 11, no. 16 (2014-08-20), S.4407-4414 |
| Datensatznummer |
250117556
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| Publikation (Nr.) |
 copernicus.org/bg-11-4407-2014.pdf |
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| Zusammenfassung |
| Lactic acid (LA) and glycolic acid (GA), which are low-molecular-weight
hydroxyacids, were identified in the particle and gas phases within the
marine atmospheric boundary layer over the western subarctic North Pacific.
A major portion of LA (81%) and GA (57%) was present in the particulate
phase, which is consistent with the presence of a hydroxyl group in these
molecules leading to the low volatility of the compounds. The average
concentration (±SD) of LA in more biologically influenced marine
aerosols (33 ± 58 ng m−3) was substantially higher than that in
less biologically influenced aerosols (11 ± 12 ng m−3). Over the
oceanic region of phytoplankton blooms, the concentration of aerosol LA was
comparable to that of oxalic acid, which was the most abundant diacid during
the study period. A positive correlation was found between the LA
concentrations in more biologically influenced aerosols and chlorophyll a in
seawater (r2 = 0.56), suggesting an important production of aerosol
LA possibly associated with microbial (e.g., lactobacillus) activity in
seawater and/or aerosols. Our finding provides a new insight into the poorly
quantified microbial sources of marine organic aerosols (OAs) because such
low-molecular-weight hydroxyacids are key intermediates for OA formation. |
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