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| Titel |
Build-up and decline of organic matter during PeECE III |
| VerfasserIn |
K. G. Schulz, U. Riebesell, R. G. J. Bellerby, H. Biswas, M. Meyerhöfer, M. N. Müller, J. K. Egge, J. C. Nejstgaard, C. Neill, J. Wohlers, E. Zöllner |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2008-05-06), S.707-718 |
| Datensatznummer |
250002516
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| Publikation (Nr.) |
 copernicus.org/bg-5-707-2008.pdf |
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| Zusammenfassung |
| Increasing atmospheric carbon dioxide (CO2) concentrations due to
anthropogenic fossil fuel combustion are currently changing the ocean's
chemistry. Increasing oceanic [CO2] and consequently
decreasing seawater pH have the potential to significantly impact
marine life. Here we describe and analyze the build-up and decline of a
natural phytoplankton bloom initiated during the 2005 mesocosm
Pelagic Ecosystem CO2 Enrichment study (PeECE III). The draw-down
of inorganic nutrients in the upper surface layer of the mesocosms was
reflected by a concomitant increase of organic matter until day
t11, the peak of the bloom. From then on, biomass standing stocks
steadily decreased as more and more particulate organic matter was
lost into the deeper layer of the mesocosms. We show that organic
carbon export to the deeper layer was significantly enhanced at
elevated CO2. This phenomenon might have impacted organic matter
remineralization leading to decreased oxygen concentrations in the
deeper layer of the high CO2 mesocosms as indicated by
deep water ammonium concentrations. This would have
important implications for our understanding of pelagic ecosystem
functioning and future carbon cycling. |
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