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Time series (in calibrated radiocarbon kyr B.P.) of modeled freshwater discharge from the St. Lawrence River. The model is initiated with a flux of 0.07 Sv (7) and then solved to match the routing data (see SI Methods). 87Sr/86Sr is in red, U/Ca is in blue, δ18Oseawater is in black, and ΔMg/Ca is in purple, with gray denoting the ≈30% propagated error (see SI Methods).
