"Calcification rates" refer to the speed or rate at which a substance or tissue in the body becomes hardened or forms calcium deposits. Full definition
In addition, they state that there was «no significant correlation between calcification rate and seawater aragonite saturation (Ωarag)» and «no evidence of CO2 impact on bleaching.» (climatism.blog)
Ocean acidification may increase calcification rates, but at a cost. (elementascience.org)
* The rising CO2 content of the atmosphere may induce very small changes in the well - buffered ocean chemistry (pH) that could slightly reduce coral calcification rates; but potential positive effects of hydrospheric CO2 enrichment may more than compensate for this modest negative phenomenon. (scholarsandrogues.com)