Deep Equatorial Pacific Ocean Oxygenation and Atmospheric CO₂ Over The Last Ice Age.

ABSTRACT: Ventilation of carbon stored in the deep ocean is thought to play an important role in atmospheric CO₂ 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 ²³⁰Th-derived fluxes of ²³²Th and excess barium, along with redox-sensitive uranium concentrations to examine past variations in dust delivery, export productivity, and bottom-water oxygenation, respectively. Our bottom-water oxygenation record is compared to other similar high-resolution records from across the Pacif

SUBMITTER: Marcantonio F 

PROVIDER: S-EPMC7171191 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature