Appendix A. Examples of linear-least squares regressions between sea-surface oxygen anomalies and heat flux anomalies (upper two panels) and between sea-surface oxygen flux and heat flux (lower two panels) for different latitudinal bands in the Northern Hemisphere. The oxygen data were binned over 50 watts m-2 heat flux anomaly increments for 10 latitudinal bands covering the entire ocean domain. The error bars are +-1 standard deviation from the mean values in each heat flux anomaly bin. The black and red solid lines are the un-weighted and weighted linear regressions. Also shown are the number of observations in each heat flux anomaly bin retained in the regression analysis (lower two panels).