Australian National University
|When:||Wednesday, April 25, 2014, 10:30 a.m. to 11:30 a.m.
|Where:||Seminar Conference Room, 10100 Burnet Road, Bldg 196-ROC, Austin, Texas 78758|
|Host:||Sean Gulick, UTIG|
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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.