Extended Data Fig. 3: Link between OPO, APOClimate and ocean heat.
From: Quantification of ocean heat uptake from changes in atmospheric O2 and CO2 composition
a, c–f, OPO concentrations (yellow) and OPO concentrations at saturation based on O2 and CO2 solubility (OPOsat, grey) as a function of ocean temperature in the GLODAPv2 database32 (a) and four Earth-system models (IPSL, GFDL, CESM and UVic; c–f). Slopes give the OPO-to-temperature ratios in nmol J−1. b, The link between ΔAPOClimate and changes in ocean heat content (that is, ΔAPOClimate-to-ΔOHC ratio) in the four models is tied to their OPO-to-temperature ratios and can be constrained using the observed OPO-to-temperature of 4.45 nmol J−1 (vertical dashed lines). To avoid visual saturation, only 16,000 points, picked randomly, are shown for OPO.
