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海洋大气中的季节性变化,水银同位素特征和环境驱动因素

Zhengcheng Song^1,2,3, Xin Miao², Congyuan Li⁴

¹State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.

Environmental science & technology

|December 22, 2025

概括

大气中的 (Hg) 同位素在海洋上的含量尚不清楚. 这项研究揭示了Hg同位素的显著空间和季节性变化,由海盐脱驱动,影响海洋水平.

科学领域:

环境化学环境化学
大气科学大气科学
海洋学海洋学海洋学

背景情况:

大气沉积是海洋环境中 (Hg) 的主要来源.
了解大气Hg在海洋上的同位素组成对于追踪Hg来源和转变至关重要.
水银同位素为Hg的运输,转化和暴露途径提供了洞察力.

研究的目的:

为了研究海洋边界层内的大气中的质量独立分离 (MIF) 标志 (Δ¹⁹⁹Hg和 Δ²⁰⁰Hg).
了解大气中的Hg同位素在海洋上的空间和季节性变化的驱动因素.
评估大气Hg同位素标记对海洋Hg沉积的影响.

主要方法:

应用一个三维同位素模型大气Hg.
模拟Hg氧化还原化学和沉积过程.
分析影响Hg同位素分离的环境因素,包括太阳辐射,海面温度和风速.

主要成果:

该模型确定了海洋边界层中氧化Hg物种的Δ¹⁹⁹Hg和Δ²⁰⁰Hg的显著空间和季节性变化.
海盐气溶除被确定为驱动这些同位素变化的关键过程.
环境因素调节Hg氧化还原化学和沉积,影响同位素特征.

结论:

大气MIF特征的季节性变化对沉积在海洋中的的同位素组成有很大影响.
氧化Hg物种的干燥和湿沉积是这种影响的关键途径.
考虑大气Hg末端成员的时空变化对于追踪海洋Hg来源和解释沉积物记录至关重要,特别是在气候变化下.

关键词:

大气中的同位素.海洋边界层是海洋边界层.质量独立的分化方法.季节性变化季节性变化

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