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<p>Silicate weathering regulates climate as a critical carbon sink, yet understanding its role in the carbon cycle is challenging because of limited knowledge about the impact of temperature and rainfall on weathering during glacial-interglacial cycles. Here we investigated the orbital scale of silicate weathering variations and their role in atmospheric carbon dioxide sequestration using reconstructions, model simulations, and modern river sediment geochemical data. Results show that silicate weathering intensity in subtropical and tropical monsoon regions follows the precession cycle and is mainly controlled by rainfall. During glacial periods, global carbon dioxide consumption by silicate weathering was lower than interglacials but remained stable at ~2.47 Teramoles per year. We propose that ice sheet expansion confined intense weathering to the subtropics and tropics during glacial times. As insolation patterns shifted with the precession cycle, rainfall belts oscillated between hemispheres, maintaining a constant weathering area and stable carbon dioxide consumption. Our study provides insights into silicate weathering’s role in the global carbon cycle, both historically and in future projections.</p>

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Precessional variation of monsoon-controlled silicate weathering caused steady atmospheric carbon dioxide consumption during glacial periods

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Debo Zhao,
  • Shiming Wan,
  • Xiangtong Huang,
  • Zhengyao Lu,
  • Peter D. Clift,
  • Dongyong Li,
  • Xiting Liu,
  • Yifei Yang,
  • Shoushu Jiang,
  • Anni Lin

摘要

Silicate weathering regulates climate as a critical carbon sink, yet understanding its role in the carbon cycle is challenging because of limited knowledge about the impact of temperature and rainfall on weathering during glacial-interglacial cycles. Here we investigated the orbital scale of silicate weathering variations and their role in atmospheric carbon dioxide sequestration using reconstructions, model simulations, and modern river sediment geochemical data. Results show that silicate weathering intensity in subtropical and tropical monsoon regions follows the precession cycle and is mainly controlled by rainfall. During glacial periods, global carbon dioxide consumption by silicate weathering was lower than interglacials but remained stable at ~2.47 Teramoles per year. We propose that ice sheet expansion confined intense weathering to the subtropics and tropics during glacial times. As insolation patterns shifted with the precession cycle, rainfall belts oscillated between hemispheres, maintaining a constant weathering area and stable carbon dioxide consumption. Our study provides insights into silicate weathering’s role in the global carbon cycle, both historically and in future projections.