Abstract
An abrupt increase in atmospheric CO₂ and depletion of atmospheric Δ¹⁴C during the most recent deglaciation (Termination 1) is thought to be related to venting of aged carbon from the interior ocean, perhaps near Antarctica. We use radiocarbon reconstructions of past ocean ventilation rates to constrain oceanic sources and sinks of CO₂, and evaluate mechanisms of subsurface hypoxia. However, records from the North Pacific are inconsistent and/or equivocal in their evidence for the presence of an aged watermass in the interior Pacific. Here we evaluate a deglacial radiocarbon record from the Gulf of Alaska on age models derived via two common techniques: tuning to the isotopic record of Greenland, and calibrating planktonic foraminiferal ¹⁴C.