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| Titel |
Dissolved methane during hypoxic events at the Boknis Eck time series station (Eckernförde Bay, SW Baltic Sea) |
| VerfasserIn |
H. W. Bange, K. Bergmann, H. P. Hansen, A. Kock, R. Koppe, F. Malien, C. Ostrau |
| 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. 4 ; Nr. 7, no. 4 (2010-04-19), S.1279-1284 |
| Datensatznummer |
250004667
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| Publikation (Nr.) |
 copernicus.org/bg-7-1279-2010.pdf |
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| Zusammenfassung |
| Dissolved CH4 was measured in the water column at the Boknis Eck (BE)
time series station in the Eckernförde Bay (SW Baltic Sea) on a monthly
basis from June 2006 to November 2008. The water column at BE was always
supersaturated with CH4 and, therefore, CH4 was released to the
atmosphere throughout the sampling period: the mean CH4 surface (1 m)
saturation at BE was 554±317%. A pulse of enhanced CH4
emissions occurs when the CH4 accumulation in the hypoxic bottom layer
during summer is terminated in late summer/autumn. We did not detect a
straightforward relationship between periods of enhanced CH4 in the
bottom layer and hypoxic events at BE: the sedimentary release of CH4
seemed to be mainly triggered by sedimenting organic material from
phytoplankton blooms. We conclude that future CH4 emissions from BE
will be determined by the intensity of phytoplankton blooms, which in turn
will be influenced by eutrophication. However, hypoxic events seem to have
only a modulating effect on the enhancement of sedimentary methanogenesis
and the subsequent release of CH4 to the water column. |
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