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<p>Late Miocene climate evolution provides an opportunity to assess Earth’s climate sensitivity to carbon cycle perturbation under warmer-than-modern conditions. Despite its relevance for understanding the climate system, the driving mechanisms underlying profound climate and carbon cycle changes – including the enigmatic Late Miocene cooling from 7 to 5.4 million years ago – remain unclear. Here, we present magnetic and geochemical paleoceanographic proxies from a hydrogenetic ferromanganese crust retrieved in the northwestern Pacific Ocean. Our results indicate a striking 50% surge in deep ocean phosphorus concentrations occurred 7 – 4 million years ago, synchronous with enhanced deep ocean oxygen consumption. Employing a global biogeochemical model, we show that increased continental phosphorus weathering, without a concurrent rise in silicate weathering, contributed to the decline in atmospheric CO<sub>2</sub> and associated cooling over the Late Miocene. This suggests a prominent decoupling of phosphorus and silicate weathering during a major carbon cycling event over the last 10 million years.</p>

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Enhanced phosphorus weathering contributed to Late Miocene cooling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月28日

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  • Yi Zhong,
  • Zhiguo Li,
  • Xuefa Shi,
  • Terry Isson,
  • Jimin Yu,
  • Sev Kender,
  • Zhou Liang,
  • George E. A. Swann,
  • Alex Pullen,
  • Michael E. Weber,
  • Jinlong Du,
  • Juan C. Larrasoaña,
  • Jingyu Zhang,
  • Yafang Song,
  • F. J. González,
  • Stefanie Kaboth-Bahr,
  • Hai Li,
  • Qi Zhang,
  • Debo Zhao,
  • Wei Cao,
  • Mingyu Zhao,
  • Qingsong Liu

摘要

Late Miocene climate evolution provides an opportunity to assess Earth’s climate sensitivity to carbon cycle perturbation under warmer-than-modern conditions. Despite its relevance for understanding the climate system, the driving mechanisms underlying profound climate and carbon cycle changes – including the enigmatic Late Miocene cooling from 7 to 5.4 million years ago – remain unclear. Here, we present magnetic and geochemical paleoceanographic proxies from a hydrogenetic ferromanganese crust retrieved in the northwestern Pacific Ocean. Our results indicate a striking 50% surge in deep ocean phosphorus concentrations occurred 7 – 4 million years ago, synchronous with enhanced deep ocean oxygen consumption. Employing a global biogeochemical model, we show that increased continental phosphorus weathering, without a concurrent rise in silicate weathering, contributed to the decline in atmospheric CO2 and associated cooling over the Late Miocene. This suggests a prominent decoupling of phosphorus and silicate weathering during a major carbon cycling event over the last 10 million years.