Ocean acidification and the Permo-Triassic mass extinction
Ocean acidification and the Permo-Triassic mass extinction
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DOI：
10.1126/science.aaa0193
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发表时间：
2015-04-10
期刊：
影响因子：
56.9
通讯作者：
Tipper, E. T.
中科院分区：
文献类型：
--
作者：
Clarkson, M. O.;Kasemann, S. A.;Tipper, E. T.
西伯利亚圈闭火山活动引发的海洋酸化可能是二叠纪-三叠纪边界生物大灭绝的一种死亡机制，但缺乏酸化事件的直接证据。我们提出了一个高分辨率的海水pH值记录在这段时间内，使用硼同位素数据结合定量建模方法。在最后的二叠纪，海洋碱度的增加使地球系统具有低水平的大气CO2和高海洋缓冲能力。灭绝的第一阶段与碳缓慢注入大气相一致，海洋pH值保持稳定。然而，在第二次灭绝脉冲期间，快速而大量的碳注入造成了突然的酸化事件，导致严重钙化的海洋生物群优先消失。
Ocean acidification triggered by Siberian Trap volcanism was a possible kill mechanism for the Permo-Triassic Boundary mass extinction, but direct evidence for an acidification event is lacking. We present a high-resolution seawater pH record across this interval, using boron isotope data combined with a quantitative modeling approach. In the latest Permian, increased ocean alkalinity primed the Earth system with a low level of atmospheric CO2 and a high ocean buffering capacity. The first phase of extinction was coincident with a slow injection of carbon into the atmosphere, and ocean pH remained stable. During the second extinction pulse, however, a rapid and large injection of carbon caused an abrupt acidification event that drove the preferential loss of heavily calcified marine biota.