Monsoon‐Enhanced Silicate Weathering as a New Atmospheric CO<sub>2</sub> Consumption Mechanism Contributing to Fast Late Miocene Global Cooling

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  • Yibo Yang
    CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing China
  • Chengcheng Ye
    Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences Beijing China
  • Albert Galy
    Centre de Recherches Pétrographiques et Géochimiques, UMR7358, CNRS, Université de Lorraine Nancy France
  • Xiaomin Fang
    CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing China
  • Yong Xue
    Micro Structure Analytical Laboratory, Peking University Beijing China
  • Yudong Liu
    Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences Beijing China
  • Rongsheng Yang
    Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences Beijing China
  • Ran Zhang
    Climate Change Research Center Institute of Atmospheric Physics, Chinese Academy of Sciences Beijing China
  • Wenxia Han
    Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment Sciences, Linyi University Linyi China
  • Weilin Zhang
    CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing China
  • Xiaobai Ruan
    Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences Beijing China

Description

<jats:title>Abstract</jats:title><jats:p>Fast late Miocene global cooling since ∼7 Ma accompanied by less changeable atmospheric CO<jats:sub>2</jats:sub> levels revealed by existing proxy reconstructions has suggested an intriguing tectonic‐climate link that remains controversial. Here, we present late Cenozoic clay mineral records of the silicate weathering intensity from the Chinese Loess Plateau and northeastern Tibetan Plateau to demonstrate a remarkable increase in silicate weathering intensity at ∼9–7 Ma induced by enhanced monsoon. This change caused CO<jats:sub>2</jats:sub> consumption ranging from 0.18 to 1.8 × 10<jats:sup>11</jats:sup> mol C yr<jats:sup>−1</jats:sup> over the East Asian monsoon region, accounting for 0.2%–2% of the modern continental silicate weathering flux, thus providing an additional atmospheric CO<jats:sub>2</jats:sub> sink. Moreover, we propose that this additional sink may have contributed to the large atmospheric CO<jats:sub>2</jats:sub> consumption and fast global cooling in the late Miocene, which ultimately caused the onset of the Northern Hemisphere glaciation at ∼7 Ma.</jats:p>

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