盐度驱动的分层增强了对沿海海洋的河流出口
Roland P Ovbiebo1, Cathryn D Sephus1, Amina T Schartup1
1Scripps Institution of Oceanography, University of California San Diego.
Research square
|April 8, 2025
概括
河口分层加剧了对沿海海洋的 (Hg) 出口. 气候变化可能会增加Hg和甲基 (MeHg) 从河口释放,这是由于增强的分层.
科学领域:
- 环境化学环境化学
- 海洋学 海洋学 海洋学
- 生态系统动力学 生态系统动力学
背景情况:
- 河流是 (Hg) 运输到沿海海洋的重要途径.
- 河口循环和分层影响金属出口,但它们对Hg的影响尚不确定.
研究的目的:
- 在不同的盐度驱动分层制度下建模Hg转化和出口.
- 评估分层对河口中的和甲基 (MeHg) 动态的影响.
主要方法:
- 开发了三种数值模型,模拟在混合良好的,轻微分层的和高度分层的条件下模拟Hg运输.
- 利用了切萨皮克湾 (CPB) 和哈德逊河口 (HRE) 的数据.
主要成果:
- 分层化增加了河流Hg出口19% (CPB) 和20% (HRE).
- 较短的Hg停留时间与更快的出口相关;非分层条件有利于Hg埋葬.
- 在CPB中略有分层的条件提高了MeHg生产 (11.5%) 和出口 (16.4%).
结论:
- 河口分层显著影响Hg和MeHg向沿海水域的出口.
- 由于气候变化而导致的分层的预计增加可能会导致河口释放更多的Hg和MeHg.
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