在页岩气候变化期间,气候迫使对碳陆地流量进行控制
Lucien Stolze1, Bhavna Arora1, Dipankar Dwivedi1
1Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
概括
页岩气候变化作为碳汇,主要是在春季融雪期间,通过合微生物呼吸和碳酸盐气候变化. 更温暖的气候可能会减少这种二氧化碳吸收潜力.
科学领域:
- 地质化学 地质化学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 气候显著影响近地表的生物地球化学过程,影响页岩中的二氧化碳 (CO2) 分割.
- 在页岩生态系统中对碳 (C) 气候变化流程的控制尚不清楚,需要进一步调查.
研究的目的:
- 量化评估过渡性气候强迫和生物地化学机制对页岩规律中的碳分割的影响.
- 在季节性时间尺度上解开对碳气候变化流和二氧化碳吸收的控制.
主要方法:
- 利用了一套数据集,描述了页岩 regolith 中气候强迫对生物地球化学反应的特征.
- 实施了一个数值模型,模拟水透,气体交换和温度对土壤呼吸和矿物染的影响.
- 分析了二氧化碳流量和水性碳出口的季节性变化.
主要成果:
- 大约3%的土壤二氧化碳在重大透事件期间被输出到地下.
- 春季融雪导致大气二氧化碳净吸收,占水性碳出口的61%,超过矿物氧化产生的二氧化碳.
- 页岩二氧化碳消耗是由土壤微生物呼吸和碳酸气候的时间合驱动的,受水文波动的影响.
结论:
- 季节性气候强迫对于确定页岩气候对陆地碳流的净贡献至关重要.
- 更温暖的气候条件可能会降低页岩气候变化的能力,以作为二氧化碳沉降器.
- 在估计从气相组成中 CO2 的吸收时,必须考虑在过渡性水文学下扩散有限的气体运输.
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