通过在热带地区加强岩石风化来消除二氧化碳的潜力:对哥斯达黎加的评估
P C Ryan1, A Santis1, E Vanderkloot1
1Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
The Science of the total environment
|March 31, 2024
概括
在热带环境中增强的岩石气候变化可以显著减少大气中的二氧化碳 (CO2). 将粉状岩石应用在农田上显示出大量二氧化碳捕获的潜力,提供了可行的气候变化缓解战略.
科学领域:
- 地球和环境科学 地球和环境科学
- 气候科学 气候科学
- 地质化学 地质化学
背景情况:
- 热带环境具有通过增强岩石气候变化 (ERW) 捕获二氧化碳 (CO2) 的高潜力.
- 农用石涉及将粉状岩石涂抹在农田上,以加快自然气候变化过程.
- 评估潮湿热带地区的二氧化碳减排 (CDR) 潜力对于减缓气候变化至关重要.
研究的目的:
- 在潮湿的热带环境中评估二氧化碳减排 (CDR) 潜力.
- 在模拟的热带条件下实验性地确定马菲岩粉的气候变化率.
- 为了评估气候变化的速率,使用全新纪热带土壤时间序列与石基母材料.
主要方法:
- 在模拟潮湿的热带土壤条件下 (Ultisol,35°C) 对玄武岩石 (Arenal和Barva) 和USGS玄武岩标准BHVO-1进行实验性气候变化.
- 应用0.6毫米粉状岩石 (50t ha-1) 和模拟降雨与稀释的酸溶液超过14天.
- 使用ICP-MS对浸出的分析,并从全新纪热带土壤时间序列中确定气候变化的速度.
主要成果:
- 根据实验确定了基岩石的气候变化速率,从2.4到4.5二氧化碳每小时-1年-1.1.
- 根据美国地质调查局的岩标准BHVO-1,由于其成分和颗粒大小,其排放量更高,为11.9CO2 ha-1 yr-1.
- 热带土壤的时间序列表明气候变化的速度为1.7t CO2 ha-1 yr-1.1.
- 对于哥斯达黎加来说,一个潜在的ERW场景表明每年的CDR为2至400万,占全国二氧化碳排放量的25至50%.
结论:
- 加强岩石气候变化是热带农业土壤显著减少二氧化碳的有希望的策略.
- 实验性推导率为评估ERW在热带国家减缓气候变化的可行性提供了有价值的数据.
- 该研究强调了哥斯达黎加等国家的大量CDR潜力,为实现国家气候目标做出了重大贡献.
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