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, USA.
概括
河口分层显著增加了对沿海海洋的 (Hg) 出口,有可能产生更多的甲基 (MeHg). 气候变化可能会加剧这种影响,影响海洋水平.
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:
- 河流是运送 (Hg) 到沿海海洋的主要通道,河口发挥着关键作用.
- 河口循环和分层显著影响金属的出口,包括Hg,但它们对Hg转化和甲基化的具体影响尚未完全理解.
研究的目的:
- 研究河口分层对 (Hg) 运输和甲基 (MeHg) 生产的影响.
- 在不同盐度驱动的分层模式下 (混合良好的,轻微分层的,高度分层的) 建模Hg转换.
主要方法:
- 开发三种数值模型来模拟Hg转换.
- 利用美国切萨皮克湾 (CPB) 和哈德逊河口 (HRE) 的数据.
- 在不同的分层场景下评估Hg出口和埋葬.
主要成果:
- 分层化使河流Hg出口增加了19%的CPB和20%的HRE.
- 在分层下较短的Hg停留时间促进了更快的出口,而非分层条件有利于Hg埋葬.
- 在CPB中略有分层的条件导致MeHg生产增加了11.5%,MeHg出口增加了16.4%.
结论:
- 河口分层增强了Hg和MeHg对沿海海洋的出口.
- 季节性河流排放变化影响了分层和Hg出口动态.
- 由于气候变化而导致河口分层的预计增加可能会导致海和MeHg在沿海海洋环境中的输入量增加.
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