Work

Regional Benthic δ 18 O Stacks for the “41‐Kyr World”—An Atlantic‐Pacific Divergence Between 1.8 and 1.9 Ma

Year: 2024

Type: article

Abstract: Benthic δ 18 O stacks are the benchmarks by which paleoceanographic data are stratigraphically aligned and compared. However, a recent study found that between 1.8 and 1.9 million years ago (Ma) several Ceara Rise records differed substantially from the widely used LR04 global stack. Here, we use new Bayesian stacking software to construct regional stacks and demonstrate a geographical divergence in benthic δ 18 O features from 1.8 to 1.9 Ma. The pattern of isotopic stage features observed in the Ceara Rise is widespread throughout the Atlantic and differs notably from Pacific records. We propose that this regional difference in isotopic stages may be the result of relatively strong precession forcing and weaker obliquity forcing between 1.8 and 1.9 Ma. In accordance with the Antiphase Hypothesis, our results highlight a period of apparent sensitivity to regional precession forcing that is masked during most of the 41‐Kyr world due to the amplitude modulation of obliquity forcing.

Source: Geophysical Research Letters

DOI: 10.1029/2023gl107858

Authors: Yuxin Zhou, Lorraine E. Lisiecki, Taehee Lee, Geoffrey Gebbie, Charles Lawrence

Institutions: University of California, Santa Barbara, Brown University, Woods Hole Oceanographic Institution

Language: English

Topic: Geology and Paleoclimatology Research

Subfield: Atmospheric Science

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,900