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May 7, 2026Geophysical Research LettersOpen Access

Temperature‐Driven Silicate Weathering Feedbacks Terminated the Middle Eocene Climatic Optimum

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Authors

YMYiquan MaMinistry of Natural ResourcesMFMajie FanThe University of Texas at ArlingtonPSPhilip A.E. Pogge von StrandmannJohannes Gutenberg University Mainz

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Implication

Multi-proxy records reveal intensified precipitation and precession cycles affected atmospheric CO2 during the Middle Eocene.

Key Points

  • To investigate the hydroclimate dynamics and weathering processes during the Middle Eocene Climatic Optimum (MECO).
  • Analyzed high-resolution multi-proxy records from four East Asian lake basins.
  • Examined changes in precipitation, chemical weathering, and terrestrial input during the MECO.
  • Identified significant forcings on rainfall intensity including short-eccentricity, precession, and half-precession cycles.
  • Intensified precipitation enhanced chemical weathering and physical erosion before and during early MECO.
  • At peak MECO, chemical weathering increased despite reduced rainfall.
  • Proposed that exposure of fresh silicate surfaces drove temperature-induced weathering, consuming atmospheric CO2.

Cite This Study

Ma et al. (2026) studied this question.

synapsesocial.com/papers/69fbe382164b5133a91a2b75https://doi.org/10.1029/2026gl121765
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