波罗的海循环的人类诱导
Chadlin M Ostrander1,2, Yunchao Shu2,3, Sune G Nielsen2,3
1Department of Marine Chemistry & Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States.
Environmental science & technology
|May 2, 2024
概括
人类活动改变了波罗的海的 (Tl) 同位素循环. 自20世纪40年代以来,东哥特兰盆地Tl同位素值的升高表明,由于污染,海洋Tl质量平衡发生了重大变化.
科学领域:
- 海洋地球化学 海洋地球化学
- 环境科学 环境科学
- 同位素地球化学 同位素地球化学
背景情况:
- 人类活动对海洋化学有重大影响,包括微量元素循环.
- 波罗的海在东哥特兰盆地等盆地中具有无氧和硫化条件,为研究生物地球化学过程提供了独特的环境.
- 在海洋环境中循环的 (Tl) 同位素对氧化还原条件和混合过程敏感.
研究的目的:
- 研究波罗的海的 (Tl) 同位素循环,特别是东哥特兰盆地.
- 为了确定人为活动是否影响了这个海洋系统中的Tl同位素质量平衡.
- 为了确定波罗的海Tl同位素组成变化的历史时间.
主要方法:
- 在波罗的海海水中分析 (Tl) 度和稳定同位素组成 (ε 205 Tl).
- 检查东哥特兰盆地的沉积物核心中的Tl同位素,以重建历史变化.
- 观察到的Tl同位素数据与保守的混合模型进行比较.
主要成果:
- (Tl) 和其同位素在无氧东哥特兰盆地的水和沉积物之间积极循环.
- 波罗的海水Tl同位素组成 (ε 205Tl) 比保守的混合计算预测的要高.
- 沉积物核心数据表明,在公元1940年至1947年间,海水度显著增加,与其他人为标志物相吻合.
结论:
- 波罗的海中Tl同位素值的升高是人类影响的直接结果.
- 自20世纪中叶以来,人类活动已经明显改变了波罗的海的 (Tl) 同位素质量平衡.
- 这项研究强调了微量元素同位素系统对人类引起的环境变化的敏感性.
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