改进了在海洋大气中复制粒子束的机制建模
Yanping Zhang1,2, Zeng Xu1, Guoling Han3
1Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China.
Environmental science & technology
|January 16, 2025
概括
颗粒结合 (HgP) 是一个全球性的问题. 一个新的模型准确地模拟了海洋HgP,揭示了它在海洋沉积中的重要作用,将焦点从气态转移到气态.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 水银污染 污染 污染
背景情况:
- (Hg) 是一种普遍存在的神经毒性污染物,对全球健康有影响.
- 颗粒结合 (HgP) 是通过气态 (HgII) 吸附到气溶,特别是海盐气溶 (SSA) 上形成的.
- 现有的模型很难复制海洋大气中观察到的HgP丰度,与大陆环境不同.
研究的目的:
- 模拟海盐气溶结合HgP在海洋大气中的循环,使用改进的机械方案.
- 为了比较基于过程的方案与传统的基于海洋HgP的统计方案的性能.
- 构建一个新的全球大气循环预算.
主要方法:
- 将改进的机械方案纳入大气化学物质运输模型.
- 在海洋大气中模拟海盐气溶结合的HgP循环过程.
- 模型结果与观察到的HgP和HgII度的比较.
主要成果:
- 一个基于统计的方案准确地建模了大陆的HgP,但在海洋上失败了.
- 基于过程的方案成功地复制了海洋HgP度和HgP/HgII比率.
- 一项新的全球预算估计SSA-bound HgP大气负荷为4Mg,干沉积量为160Mg yr-1和湿沉积量为1410Mg yr-1.1.
结论:
- 基于过程的模型对于准确模拟海洋大气中的循环是必不可少的.
- 微粒沉积是进入海洋生态系统的重要,以前被低估的途径.
- 这项研究需要重新评估海洋环境中沉积风险.
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