在受水力动力学过程影响的大陆架上,与铁相关的有机碳的保存
Haoshuai Li1,2, Deju Lin1,2, Haiyang Zhang1,2
1Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
Environmental science & technology
|July 31, 2024
概括
东中国海的水力动力学过程增强了铁的作用.
科学领域:
- 海洋地球化学 海洋地球化学
- 生物地质化学生物地质化学
- 沉积物有机地化学 沉积物有机地化学
背景情况:
- 在水生系统中保存有机碳 (OC) 对于理解全球碳循环至关重要.
- 与铁相关的有机碳 (OC-Fe) 在OC封存中发挥着重要作用.
- 大陆架环境是OC埋葬和转变的关键区域.
研究的目的:
- 调查东海OC-Fe的来源,反应性和保存机制.
- 阐明水力动力学过程对OC-Fe在大陆架上的命运的影响.
- 评估OC-Fe在海洋沉积物中长期存储碳中的作用.
主要方法:
- 分析13C和14C同位素在颗粒大小分离的沉积物中.
- 应用同位素混合模型来估计OC来源.
- 使用热热解热来确定OC-Fe的反应性.
- 在可排序的污泥部分 (20-63微米) 中研究OC-Fe比例 (fOC-Fe).
主要成果:
- 在可排序的污泥部分中发现了最高的OC-Fe比例 (fOC-Fe),这表明在水力动力学影响下OC的铁保护得到了增强.
- 放射性碳 (Δ14C-OC-Fe) 的值在-358.73~64.03‰之间,表明现代和古代有机碳的混合物.
- 在Δ14C-OC-Fe值,古代OC-Fe百分比和fOC-Fe之间观察到强烈的正线性关系,突出显示了古代OC与铁的联系,这是由于水力动力学过程造成的.
- 有证据表明,OC-Fe的衰老和与铁的紧密联系是由水力动力学力驱动的.
结论:
- 水力动力学过程显著地影响了在边缘海洋中有机碳与铁的结合和保存.
- 大陆架沉积物充当重要的"生槽",用于长期的碳捕获.
- 了解OC-Fe动态对于准确评估海洋碳预算和气候反至关重要.
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