Projected reversal of the oceanic stable carbon isotope ratio depth gradient with continued anthropogenic carbon emissions
Projected reversal of the oceanic stable carbon isotope ratio depth gradient with continued anthropogenic carbon emissions
复制标题
随着持续的人为碳排放，海洋稳定碳同位素比深度梯度的预计逆转
DOI：
10.1038/s43247-022-00388-8
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Kwon, E.Y.
中科院分区：
文献类型：
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作者：
Kwon, E.Y.
古海洋学记录表明，海洋中溶解的无机碳的稳定碳同位素组成（δ13C）的当前垂直梯度在古新世-始新世热最大值期间发生了逆转，这是碳相对快速释放到气候系统中的早期阶段。在这里，我们展示了在各种温室气体排放情景下观测受限海洋模型的模拟。我们预计，到 2100 年，全球海洋表层溶解无机碳的平均 δ13C 将减少 -1.8 至 -6.3 ‰。这种减少是由海洋吸收人为二氧化碳（碳 13 已耗尽）驱动的。我们的研究结果表明，除非人为碳排放很快减少，否则到 2100 年，溶解无机碳的 δ13C 自然垂直梯度将会消除或逆转。我们的结论是，古新世-始新世最高热量是持续快速的人为碳排放下未来全球碳循环扰动的地质模拟。
Paleoceanographic records suggest that the present-day vertical gradient in the stable carbon isotopic composition (δ13C) of dissolved inorganic carbon in the ocean was reversed during the Paleocene-Eocene Thermal Maximum, an early period of relatively rapid release of carbon into the climate system. Here we present simulations from an observationally constrained ocean model under various greenhouse gas emissions scenarios. We project a decrease in the globally averaged δ13C of dissolved inorganic carbon in the surface ocean of between −1.8 to −6.3 ‰ by 2100. This reduction is driven by oceanic absorption of anthropogenic carbon dioxide, which is depleted in carbon-13. Our findings suggest an elimination or reversal of the natural vertical gradient in the δ13C of dissolved inorganic carbon by 2100 unless anthropogenic carbon emissions are reduced soon. We conclude that the Paleocene-Eocene Thermal Maximum is a geologic analogue of future global carbon cycle perturbations under continued rapid anthropogenic carbon emissions.