Revisiting the mid-Pleistocene transition ocean circulation crisis

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2024-11-07 DOI:10.1126/science.adn4154

Sophia K. V. Hines, Christopher D. Charles, Aidan Starr, Steven L. Goldstein, Sidney R. Hemming, Ian R. Hall, Nambiyathodi Lathika, Mollie Passacantando, Louise Bolge

引用次数: 0

Abstract

The mid-Pleistocene transition (MPT) [~1.25 to 0.85 million years ago (Ma)] marks a shift in the character of glacial-interglacial climate (1, 2). One prevailing hypothesis for the origin of the MPT is that glacial deep ocean circulation fundamentally changed, marked by a circulation “crisis” at ~0.90 Ma (marine isotope stages 24 to 22) (3). Using high-resolution paired neodymium, carbon, and oxygen isotope data from the South Atlantic Ocean (Cape Basin) across the MPT, we find no evidence of a substantial change in deep ocean circulation. Before and during the early MPT (~1.30 to 1.12 Ma), the glacial deep ocean variability closely resembled that of the most recent glacial cycle. The carbon storage facilitated by developing deep ocean stratification across the MPT required only modest circulation adjustments.

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重新审视更新世中期过渡时期的海洋环流危机

中新世过渡（MPT）[约 125 万年前至 85 万年前（Ma）]标志着冰川-间冰期气候特征的转变 ( 1 , 2 ) 。关于冰川-间冰期的起源，一种流行的假说是冰川深海环流发生了根本性变化，其标志是在距今约 0.90 Ma（海洋同位素阶段 24 至 22）发生了环流 "危机" ( 3 )。利用南大西洋（开普盆地）跨越 MPT 的高分辨率成对钕同位素、碳同位素和氧同位素数据，我们没有发现深海环流发生重大变化的证据。在大冰期之前和早期（约 1.30 至 1.12 Ma），冰期深海的变化与最近一次冰期周期的变化非常相似。在整个MPT期间，深海分层的发展促进了碳储存，这只需要对环流进行适度的调整。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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