Pulsed biogenic methane emissions coupled with episodic warming during the Toarcian Oceanic Anoxic Event

• 成果类型: Article
• 署名作者: Qiu, Ruoyuan; Yu, Zhichao; Mills, Benjamin J. W.; Huang, Renda; Zhang, Wang; Isson, Terry; Wan, Bo; Zhang, Ruizhen; Zhao, Mingyu; Jin, Zhijun
• 署名单位: Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; University of Leeds; Peking University; University of Waikato; Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13310
• DOI: 10.1073/pnas.2423598122
• 发表日期: 2025-09-09
• 关键词: carbon-isotope excursion; eocene thermal maximum; gas hydrate; seawater chemistry; secular variation; high-resolution; climate; cycle; extinction; EVOLUTION

摘要

Reconstructing carbon release fluxes during ancient climatic warming events is important for improving predictions of carbon cycle and climate dynamics under future anthropogenic warming scenarios. We investigate the extent of biogenic methane release and its approximately 183 million years ago. To do this, we developed a global biogeochemical simulations. Based on a high- resolution record of carbon isotope excursions from the Yorkshire section, our results indicate that a release of at least 4,700 Gt carbon from changes in atmospheric pCO2 and global temperature. This massive methane release may have led to a substantial increase in atmospheric pCH4 and contributed to additional global surface warming, perhaps by more than 2 degrees C. We further elucidate that the liberation of methane may have been facilitated by an upsurge in methanogenesis alongside a concomitant decline in methane oxidation within organic- rich, sulfate- depleted that exacerbates environmental deterioration during climatic warming events, ultimately contributing to mass extinction of marine life.