Ocean chemistry and atmospheric CO2 sensitivity to carbon perturbations throughout the Cenozoic
Ocean chemistry and atmospheric CO2 sensitivity to carbon perturbations throughout the Cenozoic
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DOI：
10.1029/2009gl041436
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发表时间：
2010-02
影响因子：
5.2
通讯作者：
M. Stuecker;R. Zeebe
中科院分区：
文献类型：
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作者：
M. Stuecker;R. Zeebe
我们评估了大气CO2（pCO 2）和海洋化学对碳扰动的响应，将现代碳循环敏感性置于新生代的背景下。我们使用碳循环模型LOSCAR来研究过去67 Ma的扰动效应。我们的研究结果表明，大气中的CO2和海洋表面的pH值在中新世（1015 Ma前）的碳扰动比现代条件下，在新生代早期的敏感性较低。我们发现，与现代条件相比，古新世-始新世边界（256 Ma前）对碳输入的敏感性很可能较低。此外，我们表明，新生代演化的稳定状态pCO 2和海水Mg/Ca比是至关重要的系统的敏感性碳释放。
We assess the response of atmospheric CO2 (pCO2) and ocean chemistry to carbon perturbations, placing modern carbon‐cycle sensitivity in the context of the Cenozoic. We use the carbon‐cycle model LOSCAR to study the effect of perturbations over the past 67 Ma. Our results indicate that atmospheric CO2 and surface ocean pH were slightly more sensitive to carbon perturbations during the Miocene (∼15 Ma ago) compared to modern conditions and less sensitive during the earlier part of the Cenozoic. We find that the sensitivity to carbon input at the Paleocene‐Eocene boundary (∼56 Ma ago) was most likely lower compared to modern conditions. Further, we show that the Cenozoic evolution of steady state pCO2 and seawater Mg/Ca ratios is critical for the system's sensitivity to a carbon release.