Park et al. (1) use a global biogeochemical model (GEOCLIM) to suggest that weathering associated with emergence of mafic islands in Southeast Asia resulted in a ∼350-ppm decrease in atmospheric CO₂ during the last 15 Ma. However, only matching pCO₂ yields nonunique solutions that cannot be distinguished from previous hypotheses, such as increasing erosion and ensuing increased land-surface reactivity (2, 3), even when using the same model (4). Critically, based on only sparse data, Park et al. (1) impose high mafic weathering fluxes from Southeast Asia, but these fluxes fail to satisfy fundamental mass-balance constraints from global weathering proxies. In particular, both the direction and magnitude of change in marine ⁸⁷Sr/⁸⁶Sr and ¹⁸⁷Os/¹⁸⁸Os (5, 6) since 15 Ma cannot be reconciled with an increase in mafic weathering.

中文翻译：

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同位素质量平衡限制排除了镁铁质风化推动新近纪冷却[物理科学]

公园等人。( 1 ) 使用全球生物地球化学模型 (GEOCLIM) 表明，与东南亚镁铁质岛出现相关的风化作用导致过去 15 Ma大气 CO _{2减少了约 350 ppm。}然而，仅匹配p CO ₂会产生无法与先前假设区分开来的非唯一解，例如增加侵蚀并随之增加地表反应性 ( 2 , 3 )，即使使用相同的模型 ( 4 ) 也是如此。至关重要的是，Park 等人仅基于稀疏数据。( 1) 强加来自东南亚的高镁铁质风化通量，但这些通量未能满足全球风化代理的基本质量平衡约束。特别是15 Ma以来海相⁸⁷ Sr/ ⁸⁶ Sr和¹⁸⁷ Os/ ¹⁸⁸ Os ( 5 , 6 ) 变化的方向和幅度都不能与镁铁质风化作用的增加相协调。