在长江河口的极端洪水事件中溶解的有机物质的组成和特征
Zhao Liang Chen1, Haibo Zhang2, Yuanbi Yi1
1Department of Ocean Science and Center for Ocean Research in Hong Kong and Macau, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, 999077, Hong Kong.
The Science of the total environment
|January 8, 2024
概括
极端洪水显著改变河口中的溶解有机物 (DOM),增加了不稳定的化合物和土生土长的DOC流. 长江河口充当过器,但洪水增强了对抗性DOM向海洋的运输.
科学领域:
- 环境化学环境化学
- 生物地质化学生物地质化学
- 海洋学 海洋学 海洋学
背景情况:
- 了解河口中溶解有机物 (DOM) 的命运对于全球生物地球化学循环至关重要.
- 洪水等极端水文事件可能会影响河口DOM动态.
- 长江河口 (YRE) 是一个主要的全球河流系统,受到大量排放变化的影响.
研究的目的:
- 调查极端洪水事件对长江河口DOM分子组成和命运的影响.
- 为了比较DOM在洪水期间的特征与高排放期间的特征.
- 评估YRE作为DOM运输到东海的过器的作用.
主要方法:
- 用里叶变换离子循环子共振质谱法 (FT-ICR MS) 来分析DOM分子组成.
- 在从YRE到东中国海的横段收集DOM样本.
- 分析的重点是比较DOM在高排放和极端洪水期间的特征.
主要成果:
- 洪水条件将更多多样化的DOM分子引入了YRE,特别是在淡水末端成员中.
- 在洪水期间,DOM变得更加不稳定和不稳定.
- YRE过了大多数引入的分子,但洪水增加了对抗降解的土壤DOM的运输,导致土壤DOC流量高约1.6倍.
结论:
- 极端洪水显著改变了河口DOM的组成,增加了不稳定和耐药的土壤原生化合物.
- 长江河口充当过器,但洪水事件增加了特定DOM分量的出口到海洋.
- 洪水频率的增加需要进一步研究它们对河口和海洋DOM周期的长期影响.
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