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森林火灾对亚马逊地区垃圾和土壤中稳定同位素组成的影响

Larissa Richter¹, David Amouroux², Emmanuel Tessier²

¹Institute of Chemistry, University of Campinas (UNICAMP), 13083-970, Campinas, São Paulo, Brazil.

|August 11, 2023

概括

稳定的同位素可以追踪森林火灾排放. 较高的火灾严重程度会导致同位素分离,为热带森林火灾创造独特的同位素指纹.

科学领域:

环境科学环境科学
地质化学地质化学
大气化学大气化学

背景情况:

森林火灾,特别是在亚马逊等热带地区,是大气中的重要贡献者.
目前用于追踪来自火灾的排放的方法存在不确定性.
燃烧过程中稳定同位素的分离是一种已知的现象,主要研究煤炭.

研究的目的:

调查 (Hg) 稳定同位素在追踪森林火灾排放中的潜力.
为了确定火灾严重程度对森林火灾残留物中Hg同位素组成的影响.
为了确定热带森林火灾产生的排放的同位素指纹.

主要方法:

在巴西亚马逊地区进行了小规模和大规模的处方燃烧实验.
在火灾前后的垃圾,土壤和灰样本中分析了同位素组成 (δ202Hg, Δ200Hg, Δ199Hg).
评估了火灾严重程度和燃烧温度对Hg同位素分离的影响.

主要成果:

在小规模火灾实验中没有观察到显著的Hg同位素分离.
大规模的火灾实验显示了土壤和灰中显著的质量依赖分化 (MDF).
更高的燃烧温度导致更轻的Hg同位素的优先释放,用更重的同位素丰富灰.
没有观察到质量独立的分化,类似于煤炭燃烧.

结论:

森林火灾的严重程度会影响稳定同位素的分离.
稳定的Hg同位素显示出可以追踪热带森林火灾产生的排放的潜力.
建立了热带森林火灾Hg排放的同位素指纹,反映了垃圾和土壤同位素签名的混合.

关键词:

灰灰灰是一个大气中的排放大气中的排放.燃烧方式燃烧方式同位素组成同位素组成垃圾垃圾是一个垃圾.土壤土壤土壤.

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