Continental configuration controls ocean oxygenation during the Phanerozoic
Continental configuration controls ocean oxygenation during the Phanerozoic
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DOI：
10.1038/s41586-022-05018-z
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发表时间：
2022-08
期刊：
影响因子：
64.8
通讯作者：
A. Pohl;A. Ridgwell;R. Stockey;C. Thomazo;A. Keane;E. Vennin;C. Scotese
中科院分区：
文献类型：
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作者：
A. Pohl;A. Ridgwell;R. Stockey;C. Thomazo;A. Keane;E. Vennin;C. Scotese
海洋动物的早期进化和大部分灭绝历史被认为是由海洋中溶解氧浓度（[O2]）的变化驱动的。反过来，[O2]被广泛认为是由大气氧（pO2）的地质历史主导的。相比之下，我们在这里通过一系列地球系统模型实验展示了显生宙期间的大陆重排如何驱动海洋氧合的深刻变化，并导致上层海洋和海底 [O2] 之间在时间上的根本脱钩。我们进一步确定了全球海洋环流中状态转变的存在，这导致显生宙早期甚至在现代 pO2 下发生广泛的深海缺氧。我们发现海洋氧合在稳定的千年 (kyr) 周期内振荡，这也提供了一种因果机制，可以解释古生代早期后生动物辐射和灭绝率升高的原因。在我们的模型中，全球气候和海洋通风之间不存在任何简单的相关性，并且海洋氧合发生了独立于大气pO2的深刻变化，这对海洋氧化还原代理的解释提出了挑战，但也指出了大陆构造在生物圈演化中迄今为止未被认识到的作用。
The early evolutionary and much of the extinction history of marine animals is thought to be driven by changes in dissolved oxygen concentrations ([O2]) in the ocean, –. In turn, [O2] is widely assumed to be dominated by the geological history of atmospheric oxygen (pO2),. Here, by contrast, we show by means of a series of Earth system model experiments how continental rearrangement during the Phanerozoic Eon drives profound variations in ocean oxygenation and induces a fundamental decoupling in time between upper-ocean and benthic [O2]. We further identify the presence of state transitions in the global ocean circulation, which lead to extensive deep-ocean anoxia developing in the early Phanerozoic even under modernpO2. Our finding that ocean oxygenation oscillates over stable thousand-year (kyr) periods also provides a causal mechanism that might explain elevated rates of metazoan radiation and extinction during the early Palaeozoic Era. The absence, in our modelling, of any simple correlation between global climate and ocean ventilation, and the occurrence of profound variations in ocean oxygenation independent of atmosphericpO2, presents a challenge to the interpretation of marine redox proxies, but also points to a hitherto unrecognized role for continental configuration in the evolution of the biosphere.