Diatoms are under threat of decline due to oceanacidification, study shows nature
One-dimensional representation of warming and OA effects on silica dissolution and export to depth in our model, using globally averaged vertical profiles of temperature and pH under preindustrial conditions and for the year 2200 . The right panel depicts the model parameterization for opal dissolution, applied to the corresponding temperature and pH profiles. Averaged over the upper 1,000 m, the specific opal dissolution rate under preindustrial conditions amounts to 0.0008 , that is, 0.
3-fold , thereby leading to a stronger flux attenuation with depth compared to preindustrial conditions. At the same time, pH decreases by around 0.6 units until year 2200 . According to our findings, opal dissolution rates are 57% lower per unit decrease in pH, . This effect of pH works in the opposite direction as the temperature effect, that is, slowing down opal dissolution and thus weakening the decline of opal with depth.
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