Glacial Southern Ocean deep water Nd isotopic composition dominated by benthic modification.

ABSTRACT: The deep Southern Ocean (SO) circulation plays a key role in the storage and release of CO₂ in Earth's climate system. The uptake and release of CO₂ strongly depend on the redistribution of well and poorly ventilated deep ocean water masses. Recently, evidence was found for possible stronger Pacific deep water overturning and subsequent intrusion into the SO during periods of reduced AMOC. Here, we present new authigenic neodymium isotope data (ɛNd) from two sites within the Atlantic sector of the SO to assess the distribution of water masses during the past 150 ka. PS 1768-8 (3299 m) and ODP 1093 (3624 m) feature unradiogenic interglacial ɛNd-signatures, which are typical for present-day Weddell Sea sourced Antarctic Bottom Water (AABW) (ɛNd ~  - 8.6). During peak gl

SUBMITTER: Hallmaier M 

PROVIDER: S-EPMC11747105 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature