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| Titel |
Untypical even-to-odd predominance in the low-molecular n-alkanes of water, suspended matter, and bottom sediments in some regions of the Arctic Basin |
| VerfasserIn |
Anastasia Drozdova, Nikolay Belyaev, Mikhail Ponyaev |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250087004
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| Publikation (Nr.) |
 EGU/EGU2014-963.pdf |
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| Zusammenfassung |
| Over the years, several studies have shown an unusual predominance of even-carbon number
n-alkanes in dissolved and particulate phase samples and sediment samples from
various regions of the World Ocean [Nachman, 1985; Nishimura and Baker, 1985;
Elias et al., 1997]. Different possible sources were proposed such as diagenesis
(diagenetic origin from co-occurring fatty acids and alcohols), direct microbial
input, microbial degradation of algal detritus, etc. Some researchers, however, are
incredulous about this phenomenon and consider relatively high content of even-carbon
number n-alkanes as contamination during the experiments. We report here the results
of GC and GC-MS analysis of water, suspended particulate matter and sediment
samples collected during 7 marine and coastal scientific expeditions to the White
and Kara Seas, and to the central Arctic Basin (2004-2013). Many of the above
samples (more than 30) present n-alkane distribution with a strong even-carbon
number predominance of n-C14H30, and n-C16H34. Maximum enrichment was
observed in some suspended matter samples with predominance of n-C16H34. The
origin of even-carbon number n-alkanes in marine ecosystems is still not clear. In
Antarctic region n-C16 and n-C18 and other even chain n-alkanes were reported to be
dominant in the samples of the sea-ice algae, zooplankton and fish [Green et al.
1997] however in the Arctic region this phenomenon has not been demonstrated yet.
Increasing of bacteria number and δ13C values observed in course of the accompanying
studies [Lein et al., 2013] suggest existence of mechanism of phytoplankton bacterial
destruction in the Arctic ecosystems, leading to formation of even-carbon number
n-alkanes.
R.J. Nachman - Lipids, Vol. 20, No 9, pp. 629-633 (1985).
M. Nishimura, E.W. Baker - Geochim. et Cosmochim. Acta, Vol. 50, pp. 299-305
(1986).
V.O. Elias, B.R.T. Simoneit, J.N. Cardoso - Naturwissenschaften, Vol. 84, pp. 415-420
(1997).
G. Green et al. - Marine Pollution Bulletin, Vol. 25, pp. 293-302 (1992).
A.Y. Lein et al. - Oceanology, Vol. 53, No 5, pp. 570-606 (2013). |
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