Gehlen M., Gangsto R., Schneider B., Bopp L., Aumont Olivier, Ethe C. (2007). The fate of pelagic CaCO3 production in a high CO2 ocean : a model study. Biogeosciences, 4 (4), p. 505-519. ISSN 1726-4170.
Titre du document
The fate of pelagic CaCO3 production in a high CO2 ocean : a model study
Gehlen M., Gangsto R., Schneider B., Bopp L., Aumont Olivier, Ethe C.
Source
Biogeosciences, 2007,
4 (4), p. 505-519 ISSN 1726-4170
This model study addresses the change in pelagic calcium carbonate production (CaCO3, as calcite in the model) and dissolution in response to rising atmospheric CO2. The parameterization of CaCO3 production includes a dependency on the saturation state of seawater with respect to calcite. It was derived from laboratory and mesocosm studies on particulate organic and inorganic carbon production in Emiliania huxleyi as a function of pCO(2). The model predicts values of CaCO3 production and dissolution in line with recent estimates. The effect of rising pCO(2) on CaCO3 production and dissolution was quantified by means of model simulations forced with atmospheric CO2 increasing at a rate of 1% per year from 286 ppm to 1144 ppm over a 140 year time-period. The simulation predicts a decrease of CaCO3 production by 27%. The combined change in production and dissolution of CaCO3 yields an excess uptake of CO2 from the atmosphere by the ocean of 5.9 GtC over the period of 140 years.
