Figure 3

Seasonal variation of observed pH and %DO. (a) Mean monthly site-specific pH (points), distribution of predicted ‘atmospheric equilibrium’ pH across all sites for each month (boxplots), and the probability of observing aragonite supersaturation within the entire sampling region in a given month (dashed line corresponding to right axis). (b) Mean monthly site-specific dissolved oxygen saturation. Color of points in a and b corresponds to the magnitude of the metabolic effect on pH (observed pH minus ‘atmospheric equilibrium’ pH) as indicated in the legend (same as Fig. 1). Shape of points indicates habitat of the site: triangle = channel, open circle = nearshore, filled circle = tideflat.