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| Titel |
The fate of pelagic CaCO3 production in a high CO2 ocean: a model study |
| VerfasserIn |
M. Gehlen, R. Gangstø, B. Schneider, L. Bopp, O. Aumont, C. Ethe |
| 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 ; 4, no. 4 ; Nr. 4, no. 4 (2007-07-13), S.505-519 |
| Datensatznummer |
250001850
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| Publikation (Nr.) |
 copernicus.org/bg-4-505-2007.pdf |
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| Zusammenfassung |
| 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
pCO2. The model predicts values of CaCO3 production and
dissolution in line with recent estimates. The effect of rising pCO2 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. |
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