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Marine ecosystem community carbon and nutrient uptake stoichiometry under varying ocean acidification during the PeECE III experiment
1Bjerknes Centre for Climate Research, Univ. of Bergen, Allégaten 55, 5007 Bergen, Norway
2Geophysical Institute, University of Bergen, Allégaten 70, 5007 Bergen, Norway
3Leibniz Instacross the treatments, for Marine Sciences (IFM-GEOMAR), Dusternbrooker Weg 20, 24105 Kiel, Germany
4Mohn-Sverdrup Center and Nansen Environmental and Remote Sensing Center, Thormølensgate 47, 5006 Bergen, Norway
Abstract. Inorganic carbon and nutrient biogeochemical responses were studied during the 2005 Pelagic Ecosystem CO2 Enrichment (PeECE III) study. Inverse analysis of the temporal inorganic carbon dioxide system and nutrient variations was used to determine the net community stoichiometric uptake characteristics of a natural pelagic ecosystem production perturbed over a range of pCO2 scenarios (350, 700 and 1050 μatm). Nutrient uptake showed no sensitivity to CO2 treatment. There was enhanced carbon production relative to nutrient consumption in the higher CO2 treatments which was positively correlated with the initial CO2 concentration. There was no significant calcification response to changing CO2 in Emiliania huxleyi by the peak of the bloom and all treatments exhibited low particulate inorganic carbon production (~15 μmol kg−1). With insignificant air-sea CO2 exchange across the treatments, the enhanced carbon uptake was due to increase organic carbon production. The inferred cumulative C:N:P stoichiometry of organic production increased with CO2 treatment from 1:6.3:121 to 1:7.1:144 to 1:8.25:168 at the height of the bloom. This study discusses how ocean acidification may incur modification to the stoichiometry of pelagic production and have consequences for ocean biogeochemical cycling.
Discussion Paper (PDF, 743 KB) Interactive Discussion (Closed, 3 Comments) Final Revised Paper (BG)
Citation: Bellerby, R. G. J., Schulz, K. G., Riebesell, U., Neill, C., Nondal, G., Johannessen, T., and Brown, K. R.: Marine ecosystem community carbon and nutrient uptake stoichiometry under varying ocean acidification during the PeECE III experiment, Biogeosciences Discuss., 4, 4631-4652, 2007. Bibtex EndNote Reference Manager
