Deep Equatorial Pacific Ocean Oxygenation and Atmospheric CO Over The Last Ice Age.

Ventilation of carbon stored in the deep ocean is thought to play an important role in atmospheric CO increases associated with Pleistocene deglaciations. The presence of this respired carbon has been recorded by an array of paleoceanographic proxies from various locations across the global ocean. Here we present a new sediment core from the Eastern Equatorial Pacific (EEP) Ocean spanning the last 180,000 years and reconstruct high-resolution Th-derived fluxes of Th and excess barium, along with redox-sensitive uranium concentrations to examine past variations in dust delivery, export productivity, and bottom-water oxygenation, respectively.