caco3 ra co2

Abstract

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

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