Figure 4.

GBRWIS: partial dependency plots showing the changes in estimated monthly mean seawater fCO₂ throughout the decade (a), across months (b), with temperature (c) and with salinity (d), while controlling for all other factors (Table 1). y-axis values represent the difference of the predicted fCO₂ response from the mean value (369.8 µatm fCO₂), solid thick lines show the model estimates, i.e., decadal trends (date), seasonal variation (months) and changes related to temperature and salinity. Thin lines and error bars indicate 2 standard errors of the estimates, and grey dots the residuals. Partial dependence plots display model estimates to any predictor value while holding all other predictors constant at their mean (or categorical) values.