Yearly mean surface seawater pH reported on a global scale

Note:
The global annual average of surface ocean pH is taken from the Copernicus Marine Service and based on a reconstruction method using in situ data and remote sensing data, as well as empirical relationships. The indicator is available at annual resolution, from the year 1985 onwards. The error on each yearly value varies, and is added in the data file sheet. The estimated yearly uncertainty envelop shown in the figure is defined as the annual mean of pH ± 2*the standard deviation, which corresponds to a 95 % confidence interval of the mean estimate.