Impact of Anthropogenic CO2 on the CaCO3 System in the Oceans (original) (raw)
Rising atmospheric carbon dioxide (CO 2 ) concentrations over the past two centuries have led to greater CO 2 uptake by the oceans. This acidification process has changed the saturation state of the oceans with respect to calcium carbonate (CaCO 3 ) particles. Here we estimate the in situ CaCO 3 dissolution rates for the global oceans from total alkalinity and chlorofluorocarbon data, and we also discuss the future impacts of anthropogenic CO 2 on CaCO 3 shellforming species. CaCO 3 dissolution rates, ranging from 0.003 to 1.2 micromoles per kilogram per year, are observed beginning near the aragonite saturation horizon. The total water column CaCO 3 dissolution rate for the global oceans is approximately 0.5 Ϯ 0.2 petagrams of CaCO 3 -C per year, which is approximately 45 to 65% of the export production of CaCO 3 .
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