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在海冰环境中建模水银循环:极地大气和海洋之间的缓冲区
Shaojian Huang1, Feiyue Wang2, Tengfei Yuan1
1School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China.
Environmental science & technology
|August 16, 2023
概括
一个新的模型揭示了极地海冰和雪中的季节性 (Hg) 模式,受热力学和沉积的影响. 这项研究增强了对北极和南极地区Hg循环的理解,这对气候变化和政策评估至关重要.
科学领域:
- 环境科学 环境科学
- 生物地质化学生物地质化学
- 极地科学 极地科学
背景情况:
- 海冰和雪是影响极地海洋 (Hg) 循环的关键接口.
- 目前还没有一个全面的,基于过程的模型,用于海冰环境中的Hg循环.
- 了解区域Hg预算和关键流程受到这种知识差距的阻碍.
研究的目的:
- 在海洋-海冰-大气界面开发Hg循环的综合模型.
- 为了纳入观测的极地冷层数据用于模型约束.
- 分析北极和南极海冰和雪的季节性Hg模式和运输路径.
主要方法:
- 开发一个大规模的,基于过程的Hg循环模型.
- 集成观测极地冷层数据用于模型校准和验证.
- 在雪和海冰中模拟季节性总Hg (THg) 度和流量.
主要成果:
- 雪中的季节性THg模式是由热力学和沉积驱动的,在春天达到顶峰 (北极:5.9 ng/L;南极:5.3 ng/L).
- 海冰THg度在夏季 (北极:0.25 ng/L) 和春季 (南极:0.28 ng/L) 达到峰值,有不同的Hg传播途径.
- 南极雪冰的形成有助于Hg在春季转移到海冰中;北极融雪是Hg的主要运输路线.
结论:
- 第一年的海冰作为大气Hg的缓冲,影响极地大气和海水Hg度.
- 开发的模型可以评估气候变化对极地Hg周期的影响.
- 该模型有助于评估"明马塔公约"对北极种群的有效性.
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