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Zhao Li¹, Philippe Ciais², Jonathon S Wright¹

¹Department of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling, Institute for Global Change Studies, Tsinghua University, 100084, Beijing, China.

Nature communications

|July 11, 2023

概括

碳捕获和储存 (BECCS) 的生物能源可以通过改变水循环来增加全球降雨量. 虽然农作物使用水,但大气反部分抵消了这一点,这表明需要仔细考虑气候政策.

科学领域:

气候科学气候科学
环境科学环境科学
农业科学农业科学

背景情况:

生物能源与碳捕获和储存 (BECCS) 是一个关键的二氧化碳去除战略.
大规模的生物能源种植影响着土地覆盖,改变了气候的水和能源预算.
了解这些生物物理效应对于有效减缓气候变化至关重要.

研究的目的:

研究大规模雨水生物能源作物种植对全球水循环和大气水循环的影响.
为了比较高透气 (木质) 和低透气 (草本) 生物能源作物的影响.
评估生物能源种植对水资源的净影响.

主要方法:

使用了一种合的大气-陆地模型.
显然代表了高透气 (白) 和低透气 (交换草) 的生物能源作物.
模拟的大规模雨水生物能源作物种植场景.

主要成果:

在BECCS情景下,全球陆地降水量增加.
增强的蒸发透气和内陆水分吸收有助于增加降水量.
由于降水量增加和下水量减少,土壤湿度略有下降,这表明部分补偿了水消耗.
在全球范围内,大气反部分抵消了生物能源作物的水消耗.

结论:

大规模的生物能源种植对全球水循环产生重大影响.
除去除碳之外,还必须考虑生物物理效应,包括改变的水回收和能源预算.
建议进行包括这些生物物理影响在内的全面评估,以制定涉及BECCS的有效气候减缓政策.

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