Atmospheric CO2 over the Past 66 Million Years from Marine Archives

被引:224
作者
Rae, James W. B. [1 ]
Zhang, Yi Ge [2 ]
Liu, Xiaoqing [2 ]
Foster, Gavin L. [3 ]
Stoll, Heather M. [4 ]
Whiteford, Ross D. M. [1 ]
机构
[1] Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AL, Fife, Scotland
[2] Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA
[3] Univ Southampton, Natl Oceanog Ctr Southampton, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England
[4] Swiss Fed Inst Technol, Dept Earth Sci, CH-8092 Zurich, Switzerland
来源
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 49, 2021 | 2021年 / 49卷
基金
欧洲研究理事会; 美国国家科学基金会;
关键词
CO2; boron isotopes; alkenones; climate; Cenozoic; BORON ISOTOPIC COMPOSITION; CARBON-DIOXIDE CONCENTRATIONS; CLIMATE SENSITIVITY; OCEAN ACIDIFICATION; SURFACE OCEAN; CELL-SIZE; PLANKTONIC-FORAMINIFERA; ANTHROPOGENIC CARBON; CENOZOIC SEAWATER; ION CONCENTRATION;
D O I
10.1146/annurev-earth-082420-063026
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Throughout Earth's history, CO2 is thought to have exerted a fundamental control on environmental change. Here we review and revise CO2 reconstructions from boron isotopes in carbonates and carbon isotopes in organic matter over the Cenozoic-the past 66 million years. We find close coupling between CO2 and climate throughout the Cenozoic, with peak CO2 levels of similar to 1,500 ppm in the Eocene greenhouse, decreasing to similar to 500 ppm in the Miocene, and falling further into the ice age world of the Plio-Pleistocene. Around two-thirds of Cenozoic CO2 drawdown is explained by an increase in the ratio of ocean alkalinity to dissolved inorganic carbon, likely linked to a change in the balance of weathering to outgassing, with the remaining onethird due to changing ocean temperature and major ion composition. Earth system climate sensitivity is explored and may vary between different time intervals. The Cenozoic CO2 record highlights the truly geological scale of anthropogenic CO2 change: Current CO2 levels were last seen around 3 million years ago, and major cuts in emissions are required to prevent a return to the CO2 levels of the Miocene or Eocene in the coming century. CO2 reconstructions over the past 66 Myr from boron isotopes and alkenones are reviewed and re-evaluated. CO2 estimates from the different proxies show close agreement, yielding a consistent picture of the evolution of the ocean-atmosphere CO2 system over the Cenozoic. CO2 and climate are coupled throughout the past 66 Myr, providing broad constraints on Earth system climate sensitivity. Twenty-first-century carbon emissions have the potential to return CO2 to levels not seen since the much warmer climates of Earth's distant past.
引用
收藏
页码:609 / 641
页数:33
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