十年变化和人类对孟加拉湾微量元素动态的影响:来自高分辨率珊瑚记录的证据
Md Habibur Rahman1, Tianran Chen2, Syeda Maksuda Yeasmin1
1State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Fisheries and Marine Bioscience, Jashore University of Science and Technology, Jashore, 7408, Bangladesh.
Environmental research
|May 12, 2025
概括
孟加拉湾的微量元素 (TE) 化学被人类活动显著改变,占变化的70%. 珊瑚分析揭示了基础设施,农业和旅游业造成的污染影响了这种充满活力的海洋环境.
科学领域:
- 海洋地质化学海洋地质化学
- 古海洋学是古海洋学.
- 环境科学环境科学
背景情况:
- 孟加拉湾 (BoB) 显示了复杂的微量元素 (TE) 化学,受到自然过程和人类活动的影响.
- 了解BOB中TEs的时间变异性至关重要,但仍然不太了解.
- 珊瑚骨作为重建过去环境条件和化学特征的宝贵档案.
研究的目的:
- 在孟加拉湾调查十年 (2011-2022) 的微量元素动态.
- 分析现代和亚化石Porites珊瑚中的微量元素与 (TEs/Ca) 和与 (Sr/Ca) 的比率.
- 区分自然和人为因素对该地区TE变异性的影响.
主要方法:
- 在Porites珊瑚骨中分析微量元素与的比率 (B/Ca,Mn/Ca,Fe/Ca,Ba/Ca,P/Ca,As/Ca,Zn/Ca,Cd/Ca,Sn/Ca) 和Sr/Ca.
- 利用从亚化石珊瑚的数据进行历史背景和校准.
- 使用主要组件分析与多重线性回归 (PCA-MLR) 结合来评估可变性驱动因素.
主要成果:
- 对B/Ca,Sr/Ca和Ba/Ca观察到明显的季节周期,B/Ca和Sr/Ca与海面温度 (SST) 以及Ba/Ca与河流输入有关.
- 在受河流影响的BoB中,B/Ca被验证为可靠的SST代理.
- 较高的Fe/Ca,Mn/Ca,As/Ca,P/Ca,Zn/Ca,Cd/Ca和Sn/Ca比率与特定的人为活动有关,包括基础设施建设,难民安置,农业强化和旅游业.
结论:
- 人类活动约占孟加拉湾观察到的微量元素变化的70%.
- 人类的影响显著改变了TE的动态,突出了有效的沿海管理和污染控制的需要.
- 珊瑚地质化学提供了对人类压力推动的 BoB 和类似全球地区环境变化的关键见解.
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