Dissolution rate of calcium carbonate in high pCO2 seawater under high pressure

To understand how the dissolution rate of calcium carbonate changes, laboratory experiments were conducted under high pressure and high pCO
₂
condition. As a result, rapid dissolution was observed at above 5000 ppm of pCO
₂
. The initial dissolution rates of the well correlated with initial concentration of dissolved inorganic carbon. Dissolution rate were generally decreased with time. Dissolution of calcium carbonate increased dissolved inorganic carbon and total alkalinity in the seawater. Then, degrees of undersaturation and dissolution rate of calcite in the seawater were decreased with time. Dissolution rates normalized with apparent surface area were well fit to the rate law in the empirical kinetic showed in previous studies. Using the function of dissolution rate of calcite, we constructed 3-D map of Ω and dissolution rate of calcite in the western North Pacific.