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| Titel |
Dissolved organic matter in sea spray: a transfer study from marine surface water to aerosols |
| VerfasserIn |
P. Schmitt-Kopplin, G. Liger-Belair, B. P. Koch, R. Flerus, G. Kattner, M. Harir, B. Kanawati, M. Lucio, D. Tziotis, N. Hertkorn, I. Gebefügi |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2012-04-27), S.1571-1582 |
| Datensatznummer |
250006961
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| Publikation (Nr.) |
 copernicus.org/bg-9-1571-2012.pdf |
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| Zusammenfassung |
| Atmospheric aerosols impose direct and indirect effects on the climate
system, for example, by absorption of radiation in relation to cloud
droplets size, on chemical and organic composition and cloud dynamics. The
first step in the formation of Organic primary aerosols, i.e. the transfer
of dissolved organic matter from the marine surface into the atmosphere, was
studied. We present a molecular level description of this phenomenon using
the high resolution analytical tools of Fourier transform ion cyclotron
resonance mass spectrometry (FT-ICR MS) and nuclear magnetic resonance
spectroscopy (NMR). Our experiments confirm the chemoselective transfer of
natural organic molecules, especially of aliphatic compounds from the
surface water into the atmosphere via bubble bursting processes. Transfer
from marine surface water to the atmosphere involves a chemical gradient
governed by the physicochemical properties of the involved molecules when
comparing elemental compositions and differentiating CHO, CHNO, CHOS and
CHNOS bearing compounds. Typical chemical fingerprints of compounds enriched
in the aerosol phase were CHO and CHOS molecular series, smaller molecules
of higher aliphaticity and lower oxygen content, and typical surfactants. A
non-targeted metabolomics analysis demonstrated that many of these molecules
corresponded to homologous series of oxo-, hydroxy-, methoxy-, branched
fatty acids and mono-, di- and tricarboxylic acids as well as monoterpenes
and sugars. These surface active biomolecules were preferentially
transferred from surface water into the atmosphere via bubble bursting
processes to form a significant fraction of primary organic aerosols. This
way of sea spray production leaves a selective biological signature of the
surface water in the corresponding aerosol that may be transported into
higher altitudes up to the lower atmosphere, thus contributing to the
formation of secondary organic aerosol on a global scale or transported
laterally with possible deposition in the context of global biogeocycling. |
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