在大陆尺度上,矿物永久土反的温度灵敏度
Ella V Walsh1, Robert G Hilton1, Suzanne E Tank2
1Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK.
Science advances
|October 9, 2024
概括
北极永久土中的硫化物氧化释放二氧化碳 (CO2),可能放大气候变化. 气候变暖显著增加了二氧化碳的排放,到2100年可能会增加一倍,影响北极碳循环.
科学领域:
- 地质化学 地质化学
- 气候科学 气候科学
- 环境科学 环境科学
背景情况:
- 沉积岩中的硫化矿物氧化释放大气中的二氧化碳 (CO2).
- 变暖对永久土地区硫化物氧化率的影响在很大程度上是未知的.
- 这个过程代表了气候变化中潜在的积极反循环.
研究的目的:
- 调查永久区的变暖和硫化物氧化率之间的关系.
- 在大空间和时间尺度上量化硫化物氧化释放的二氧化碳.
- 根据气候变暖情景预测未来的二氧化碳流量.
主要方法:
- 来自麦肯齐河流域60年硫酸盐度数据集的分析.
- 与观察到的变暖趋势相关的硫酸盐流量的统计分析.
- 与地化学气候模型进行比较,以了解反应动力学和矿物暴露.
主要成果:
- 硫酸盐流量增加了45%,在麦肯齐河流域主干的2.3°C升温.
- 温度敏感性表明,到2100年,大陆二氧化碳流量可能翻一番.
- 氧化率的增加在因物理气候变化和热岩而快速暴露的岩石流域中最为明显.
结论:
- 变暖显著提高了永久土地区的硫化物氧化率.
- 增加的反应速度和更大的矿物暴露都会导致更高的二氧化碳释放.
- 未来的北极变暖可能会大幅增加二氧化碳排放,改变区域碳预算.
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