Li Zi-Heng, Lenton Timothy M, Zhang Fei-Fei, Chen Zhong-Qiang, Daines Stuart J
State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan, China.
Global Systems Institute, University of Exeter, Exeter, UK.
Nat Commun. 2025 Apr 18;16(1):3703. doi: 10.1038/s41467-025-59038-0.
After the end-Permian mass extinction, the Earth system underwent extreme ecological and environmental fluctuations, including high temperatures, recurrent oceanic anoxia, and carbon cycle oscillations as demonstrated by the geochemical isotope proxy records. However, the underlying mechanism behind these oscillations remains poorly understood. Here we propose that they were produced by a coupled oscillation mode of marine phosphorus (P) and atmosphere-ocean carbon (A), driven by nonlinear redox controls on marine phosphorus burial. Our modeling demonstrates that the initial emplacement of the Siberian Traps and the mass extinction (on land and in the ocean) directly led to an early Triassic greenhouse. More importantly, it homogenized the ocean floor redox condition towards anoxia, activating amplifying feedbacks and destabilizing the system. The internal dynamics of an unstable system-rather than recurrent volcanic shocks-triggered the periodic oscillations (limit cycles) of serial excursions in carbonate carbon and uranium isotopes during the early Triassic.
二叠纪末大灭绝之后，地球系统经历了极端的生态和环境波动，包括高温、反复出现的海洋缺氧以及地球化学同位素替代记录所显示的碳循环振荡。然而，这些振荡背后的潜在机制仍知之甚少。在此我们提出，它们是由海洋磷（P）与大气 - 海洋碳（A）的耦合振荡模式产生的，这种模式由对海洋磷埋藏的非线性氧化还原控制驱动。我们的模型表明，西伯利亚暗色岩的初始就位以及（陆地和海洋中的）大灭绝直接导致了早三叠世的温室效应。更重要的是，它使洋底氧化还原条件趋于缺氧，激活并放大了反馈，使系统不稳定。一个不稳定系统的内部动力学——而非反复的火山冲击——引发了早三叠世期间碳酸盐碳和铀同位素序列偏移的周期性振荡（极限环）。
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