Extended Data Fig. 8: Sensitivity analysis of the initial 14C activity of the saline submarine groundwater (AsSG(t0)) and fresh submarine groundwater (AfSG(t0)) components.
From: Deglaciation drove seawater infiltration and slowed submarine groundwater discharge
As the porewaters are predominantly comprised of seawater, the initial 14C activity assumption of sSG has a greater impact on the calculated sSG residence time (c-d) compared to that of a varying initial 14C activity of fSG (a-b). The AfSG(t0) assumption introduces an uncertainty in the order of 0.5 years at most. That of AsSG(t0) could introduce a maximum uncertainty of 1,600 years provided AsSG(t0) equals 80 pMC, which is considered unlikely due to the relatively high 14C content of seawater (Fig. 2).
