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Build-up and decline of organic matter during PeECE III


Schulz, KG and Riebesell, U and Bellerby, RGJ and Biswas, H and Meyerhofer, M and Muller, MN and Egge, JK and Nejstgaard, JC and Neill, C and Wohlers, J and Zollner, E, Build-up and decline of organic matter during PeECE III, Biogeosciences, 5, (3) pp. 707-718. ISSN 1726-4170 (2008) [Refereed Article]

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Copyright Statement

Copyright © Muller M et al. 2008. This work is distributed under the Creative Commons Attribution 3.0 License.

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DOI: doi:10.5194/bg-5-707-2008


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.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Effects of climate change on the South Pacific (excl. Australia and New Zealand) (excl. social impacts)
UTAS Author:Muller, MN (Dr Marius Muller)
ID Code:72202
Year Published:2008
Web of Science® Times Cited:56
Deposited By:IMAS Research and Education Centre
Deposited On:2011-08-23
Last Modified:2012-03-06

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