风化作用
风化土
硅酸盐矿物
土(古典元素)
硅酸盐
降水
地球科学
地质学
大气科学
环境科学
矿物学
土壤科学
地球化学
化学
天体生物学
气象学
物理
有机化学
数学物理
作者
Susan L. Brantley,Andrew R. Shaughnessy,М. И. Лебедева,Victor N. Balashov
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2023-01-27
卷期号:379 (6630): 382-389
被引量:8
标识
DOI:10.1126/science.add2922
摘要
Earth's climate may be stabilized over millennia by solubilization of atmospheric carbon dioxide (CO2) as minerals weather, but the temperature sensitivity of this thermostat is poorly understood. We discovered that the temperature dependence of weathering expressed as an activation energy increases from laboratory to watershed as transport, clay precipitation, disaggregation, and fracturing increasingly couple to dissolution. A simple upscaling to the global system indicates that the temperature dependence decreases to ~22 kilojoules per mole because (i) the lack of runoff limits weathering and retains base metal cations on half the land surface and (ii) other landscapes are regolith-shielded and show little weathering response to temperature. By comparing weathering from laboratory to globe, we reconcile some aspects of kinetic and thermodynamic controls on CO2 drawdown by natural or enhanced weathering.
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