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摄影诱导的变化,从永久土中获得的碳在亚北极热岩池的表面水中发生

Tao Wang^1,2, Carmen Kalalian¹, Xinke Wang¹

¹Universite Claude Bernard Lyon 1, CNRS, IRCELYON, UMR 5256, Villeurbanne F-69100, France.

Environmental science & technology

|September 18, 2024

概括

在亚北极地区的永久土融化会产生具有独特有机物质的池. 实验室研究表明,这些池水对光的反应不同,影响碳循环和挥发性有机化合物排放.

科学领域:

环境科学环境科学
地质化学地质化学
摄影化学的使用.

背景情况:

亚北极永久土的融化产生了富含有机碳的热岩池.
这种永久土衍生的碳的光化学敏感性仍然不太清楚.
这些池在区域碳预算中发挥着重要作用.

研究的目的:

为了研究亚北极热岩池水中的有机物质的光化学转化.
为了比较来自不同来源的池的有机物质的光敏感性 (palsa与lithalsa).
了解不同的有机物来源如何影响光化学衰老过程.

主要方法:

实验室对来自北克北部两个不同的热岩池的地表水样本进行了辐射实验.
谱光度分析用于监测光吸收率的变化.
超高分辨率质谱测量用于描述光化学产生的化合物.

主要成果:

样本显示了不同的光化学反应:Umiujaq (lithalsa) 呈现光漂白,而Kuujjuarapik (palsa) 在芳香波长上增加了吸收.
在Kuujjuarapik样本中,最好形成不和的芳香CHO化合物.
Umiujaq样本产生了更多的芳香CHON化合物,含含量减少.

结论:

热岩池水的光化学反应性强烈依赖于永久土衍生的有机物质的来源和组成.
在光化学衰老中观察到的差异有助于理解挥发性有机化合物排放.
永久土碳的分类对于预测热土生态系统的光诱导进化至关重要.

关键词:

溶解的有机物质是一种有机物质.永久土 (Permafrost) 是一个永久土.摄影反应的光反应亚北极地区的亚北极地区.热岩 (thermokarst) 是一个热岩.

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