Monsoon-Enhanced Silicate Weathering as a New Atmospheric CO2 Consumption Mechanism Contributing to Fast Late Miocene Global Cooling
Monsoon-Enhanced Silicate Weathering as a New Atmospheric CO2 Consumption Mechanism Contributing to Fast Late Miocene Global Cooling
复制标题
季风增强的硅酸盐风化作为一种新的大气二氧化碳消耗机制，导致中新世晚期全球快速变冷
DOI：
10.1029/2020pa004008
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发表时间：
2021
影响因子：
3.5
通讯作者：
Ruan Xiaobai
中科院分区：
文献类型：
--
作者：
Yang Yibo;Ye Chengcheng;Galy Albert;Fang Xiaomin;Xue Yong;Liu Yudong;Yang Rongsheng;Zhang Ran;Han Wenxia;Zhang Weilin;Ruan Xiaobai
自~7Ma以来中新世晚期全球快速变冷，伴随着现有代理重建揭示的大气二氧化碳水平变化较小，这表明了一种有趣的构造气候联系，但这一联系仍然存在争议。在这里，我们提供了来自中国黄土高原和青藏高原东北部的新生代晚期粘土矿物记录的硅酸盐风化强度，以证明季风增强引起的~9-7Ma硅酸盐风化强度显着增加。这一变化导致东亚季风区CO2消耗量为0.18~1.8×1011mol C·yr−1，占现代大陆硅酸盐风化通量的0.2%~2%，从而提供了额外的大气CO2汇。此外，我们认为，这个额外的汇可能导致了中新世晚期大气二氧化碳的大量消耗和全球快速变冷，最终导致了北半球约7 Ma冰川作用的爆发。
Fast late Miocene global cooling since ∼7 Ma accompanied by less changeable atmospheric CO2levels 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 CO2consumption ranging from 0.18 to 1.8 × 1011mol C yr−1over the East Asian monsoon region, accounting for 0.2%–2% of the modern continental silicate weathering flux, thus providing an additional atmospheric CO2sink. Moreover, we propose that this additional sink may have contributed to the large atmospheric CO2consumption and fast global cooling in the late Miocene, which ultimately caused the onset of the Northern Hemisphere glaciation at ∼7 Ma.