溶解有机化学在运输到边缘海洋过程中的演变:从同位素和分子组成分析的洞察力
Zhenwei Yan1, Yu Xin2, Xiaosong Zhong3
1Department of Ocean Science and Center for Ocean Research in Hong Kong and Macau, The Hong Kong University of Science and Technology, Hong Kong, China; Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Institute for Advanced Ocean Study, Ocean University of China, Qingdao, Shandong, China.
Water research
|December 3, 2023
概括
河口转化溶解的有机物 (DOM) 和溶解的有机 (DON). 这项研究显示,在河口运输过程中,较少原子的DON分子转化为含有更多原子的分子.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 海洋科学 海洋科学
背景情况:
- 河口是修改陆地溶解有机物 (DOM) 进入海洋系统之前的关键接口.
- 河口中DOM的改性研究不足,影响溶解有机 (DON) 和碳循环.
- 了解DOM和DON转换是河口生物地质化学的关键.
研究的目的:
- 描述长江河口DOM和DON的分子转化.
- 为了研究DOM分子组成,稳定同位素和含量之间的关系.
- 为了阐明在河口运输过程中DOM内部的转化模式.
主要方法:
- 综合光学测量,稳定同位素分析 (δ15N和δ13C) 和里埃变换离子环子共振质谱 (FT-ICR MS).
- 分析了DOM和DON度以及沿盐度梯度的同位素特征.
- 与同位素值和含量相关的分子特性.
主要成果:
- 溶解有机碳 (DOC) 和DON度随盐度的增加而下降,而δ13C和δ15N度则增加.
- 主要通过淡水和海水混合来控制DOM和DON的行为,并观察到DON的添加.
- 随着含量增加,DOM变得更加芳香;类似蛋白质的成分减少,而类似的成分增加了含量.
- 随着DOM含量下降,δ15N和δ13C的增加,表明从低N分子转变为高N分子.
结论:
- 河口混合导致DOM和DON分子组成和同位素特征的显著转变.
- 在DOM分子结构 (含量,芳香度,成分类型) 和其同位素组成 (δ15N) 之间存在明显的联系.
- 在河口过境期间,DON分子从较低的含量转化为较高的含量,影响边缘海洋的营养循环.
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