Biogeosciences
www.biogeosciences.net
1726-4170
1726-4189
4
4
2007
10.5194/bg-4-505-2007
http://www.biogeosciences.net/4/505/2007/
http://www.biogeosciences.net/4/505/2007/bg-4-505-2007.html
http://www.biogeosciences.net/4/505/2007/bg-4-505-2007.pdf
505
519
2007-07-13
The fate of pelagic CaCO<sub>3</sub> production in a high CO<sub>2</sub> ocean: a model study
M. Gehlen
marion.gehlen@cea.fr
R. Gangstø
B. Schneider
L. Bopp
O. Aumont
C. Ethe
LSCE/IPSL, Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, Orme des Merisiers, Bât. 712, CEA/Saclay, 91198 Gif-sur-Yvette Cedex, France
LOCEAN/IPSL, Centre IRD de Bretagne, BP 70, 29280 Plouzané, France
This model study addresses the change in pelagic calcium carbonate
production (CaCO<sub>3</sub>, as calcite in the model) and dissolution in response
to rising atmospheric CO<sub>2</sub>. The parameterization of CaCO<sub>3</sub>
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 <I>Emiliania huxleyi</I> as a function of
pCO<sub>2</sub>. The model predicts values of CaCO<sub>3</sub> production and
dissolution in line with recent estimates. The effect of rising pCO<sub>2</sub> on
CaCO<sub>3</sub> production and dissolution was quantified by means of model
simulations forced with atmospheric CO<sub>2</sub> 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 CaCO<sub>3</sub> production by 27%. The
combined change in production and dissolution of CaCO<sub>3</sub> yields an excess
uptake of CO<sub>2</sub> from the atmosphere by the ocean of 5.9 GtC over the
period of 140 years.
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