Table 1.

Reference Values Used in This Study for the Estimation of the Drivers of Interior Ocean PCO₂ Variations, in Part Derived From Gridded GLODAPv2 Data (Lauvset et al., 2016)

Variable	Value	Description
pref	0 dbar	Reference pressure
Sref	34.7	Reference ocean salinity
θ ref	2.5°C	Reference ocean temperature
${\mathrm{p}\mathrm{C}\mathrm{O}}_2^{\mathrm{a}\mathrm{t}\mathrm{m}}$	400 µatm	Approximate atmospheric partial pressure of CO2 in 2015
${\mathrm{P}\mathrm{C}\mathrm{O}}_2^{\mathrm{r}\mathrm{e}\mathrm{f}}$	131 µatm	Partial pressure of CO2 using reference values of this table
sAlkref	2,298 μmol kg−1	Reference surface ocean alkalinity
${\mathrm{s}\mathrm{P}\mathrm{O}}_4^{\mathrm{r}\mathrm{e}\mathrm{f}}$	0.1 μmol kg−1	Reference surface ocean phosphate concentration
sSiref	6.3 μmol kg−1	Reference surface ocean silicate concentration
sDICref	1,967 μmol kg−1	Reference preindustrial surface ocean dissolved inorganic carbon concentration