过去450万年的全球平均海平面

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-10-16 DOI:10.1126/science.adv8389

Peter U. Clark, Jeremy D. Shakun, Yair Rosenthal, David Pollard, Steven W. Hostetler, Peter Köhler, Patrick J. Bartlein, Jonathan M. Gregory, Chenyu Zhu, Daniel P. Schrag, Zhengyu Liu, Nicklas G. Pisias

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引用次数: 0

摘要

新生代晚期全球平均海平面（GMSL）的变化仍不确定。我们利用450万年前（Ma）以来海水δ18O变化的重建来重建GMSL，这解释了全球冰盖δ18O的温度驱动变化。在4.5 ~ 3 Ma之间，海平面高度保持在比现在高20 m，而低于现在的第一个低洼表明北半球冰川作用开始于4 Ma。全球冰川作用的增强发生在3 Ma至2.5 Ma之间，在与21000年前末次冰期最大低潮相似的低潮处达到顶峰，并在更新世的大部分时间再次发生。我们将冰盖变率的中更新世转变（1.2 Ma至0.62 Ma）归因于~100 kyr CO2变率的增加对4.1千年（kyr）倾角强迫的调制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Global mean sea level over the past 4.5 million years

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Global mean sea level over the past 4.5 million years

Changes in global mean sea level (GMSL) during the late Cenozoic remain uncertain. We use a reconstruction of changes in δ¹⁸O of seawater to reconstruct GMSL since 4.5 million years ago (Ma) that accounts for temperature-driven changes in the δ¹⁸O of global ice sheets. Between 4.5 and 3 Ma, sea level highstands remained up to 20 m above present whereas the first lowstands below present suggest onset of Northern Hemisphere glaciation at 4 Ma. Intensification of global glaciation occurred from 3 Ma to 2.5 Ma, culminating in lowstands similar to the Last Glacial Maximum lowstand at 21,000 years ago and that reoccurred throughout much of the Pleistocene. We attribute the middle Pleistocene transition in ice sheet variability (1.2 Ma to 0.62 Ma) to modulation of 41-thousand-year (kyr) obliquity forcing by an increase in ~100-kyr CO₂ variability.

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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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