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| Titel |
Methane production in aerobic oligotrophic surface water in the central Arctic Ocean |
| VerfasserIn |
E. Damm, E. Helmke, S. Thoms, U. Schauer, E. Nöthig, K. Bakker, R. P. Kiene |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2010-03-19), S.1099-1108 |
| Datensatznummer |
250004595
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| Publikation (Nr.) |
 copernicus.org/bg-7-1099-2010.pdf |
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| Zusammenfassung |
| A methane surplus relative to the atmospheric equilibrium is a frequently
observed feature of ocean surface water. Despite the common fact that
biological processes are responsible for its origin, the formation of
methane in aerobic surface water is still poorly understood. We report on
methane production in the central Arctic Ocean, which was exclusively
detected in Pacific derived water but not nearby in Atlantic derived water.
The two water masses are distinguished by their different nitrate to
phosphate ratios. We show that methane production occurs if nitrate is
depleted but phosphate is available as a P source. Apparently the low N:P
ratio enhances the ability of bacteria to compete for phosphate while the
phytoplankton metabolite dimethylsulfoniopropionate (DMSP) is utilized as a
C source. This was verified by experimentally induced methane production in
DMSP spiked Arctic sea water. Accordingly we propose that methylated
compounds may serve as precursors for methane and thermodynamic calculations
show that methylotrophic methanogenesis can provide energy in aerobic
environments. |
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