Fig. 2: Area-weighted temporal evaluation of surface pH.
From: Skillful multiyear predictions of ocean acidification in the California Current System
a Monthly surface pH in the California Current over 1990–2005 for the model reconstruction (black) and observational product (red). b As in a, but for anomalies after removing a second-order polynomial fit and the seasonal cycle. The correlation coefficient between the observational product and model reconstruction is shown in the bottom left of b. c As in the other panels, but for the mean monthly seasonal cycle over 1990–2005.
