Enhanced deep Southern Ocean stratification during the lukewarm interglacials.

ABSTRACT: Between ~800 and 430 thousand years ago lukewarm interglacials were characterized by lower atmospheric CO₂ levels and colder Antarctic temperatures than subsequent interglacials. The Southern Ocean is thought to have played a crucial role, but associated ocean circulation changes remain poorly constrained, at least in part, due to the scarcity of proxy data. By using a novel 2D laser ablation technique, we here provide the first orbital-resolution Southern Ocean seawater Pb isotope records over the past 800 thousand years from a ferromanganese crust located at mid-depth (~1.6 km water depth) on Antarctica's Pacific margin. Our results reveal systematically higher ²⁰⁸Pb/²⁰⁶Pb ratios during lukewarm interglacials than during more recent interglacials while

SUBMITTER: Huang H 

PROVIDER: S-EPMC12500919 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature