Mountain glaciation drives rapid oxidation of rock-bound organic carbon.
Mountain glaciation drives rapid oxidation of rock-bound organic carbon.
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DOI：
10.1126/sciadv.1701107
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发表时间：
2017-10
期刊：
影响因子：
13.6
通讯作者：
Burton KW
中科院分区：
文献类型：
--
作者：
Horan K;Hilton RG;Selby D;Ottley CJ;Gröcke DR;Hicks M;Burton KW
山脉冰川作用极大地提高了岩石中有机碳的氧化风化速率和相关的二氧化碳释放。几百万年来，沉积岩中有机碳的氧化是大气中二氧化碳的主要来源之一，但对这种排放的控制仍然很差。我们使用Re来跟踪新西兰山区分水岭岩石结合有机碳的氧化，那里的高物理侵蚀使岩石暴露在化学风化之下。与冰川覆盖率较低的流域相比，以山谷冰川为主并受到冰冻破碎过程影响的流域的氧化风化通量高出两到三倍；我们在全球山区流域也观察到了这一特征。因此，我们表明，在风化和侵蚀期间，山脉冰川可以导致大气中的二氧化碳来源，因为新鲜的矿物在氧气可获得性高的环境中暴露于风化。这提供了一种在地质时间尺度上对抗全球变冷的机制。
Mountain glaciation greatly enhances oxidative weathering rates of organic carbon in rocks and associated carbon dioxide release. Over millions of years, the oxidation of organic carbon contained within sedimentary rocks is one of the main sources of carbon dioxide to the atmosphere, yet the controls on this emission remain poorly constrained. We use rhenium to track the oxidation of rock-bound organic carbon in the mountain watersheds of New Zealand, where high rates of physical erosion expose rocks to chemical weathering. Oxidative weathering fluxes are two to three times higher in watersheds dominated by valley glaciers and exposed to frost shattering processes, compared to those with less glacial cover; a feature that we also observe in mountain watersheds globally. Consequently, we show that mountain glaciation can result in an atmospheric carbon dioxide source during weathering and erosion, as fresh minerals are exposed for weathering in an environment with high oxygen availability. This provides a counter mechanism against global cooling over geological time scales.
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