在南大洋的海洋边界层中增加了白天大气中的
Yi Tang1, Qingru Wu2, Shuxiao Wang2
1State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beijing 100012, China.
The Science of the total environment
|June 10, 2023
概括
海洋释放蒸气,特别是在南半球白天. 这种大气中的 (Hg) 释放很可能是由阳光诱导的海水中的光降解驱动的.
科学领域:
- 环境化学环境化学
- 海洋学 海洋学 海洋学
- 大气科学 大气科学
背景情况:
- 了解海洋边界层中的大气 (Hg) 动态对于量化海洋-大气交换至关重要.
- 水星在海洋环境中的生态化学循环是复杂的,受到各种物理和生物因素的影响.
研究的目的:
- 在全球巡航期间调查海洋边界层中总气体 (TGM) 的空间和时间变化.
- 确定海洋中白天TGM增强的主要驱动因素.
主要方法:
- 在环球巡航期间 (2017年8月至2018年5月) 进行了TGM的连续测量.
- 使用统计分析将TGM度与太阳辐射和气象因素相关联.
- 分析了TGM的日间变化,以了解白天的过程.
主要成果:
- 在南印度洋 (1.29 ± 0.22 ng m−3) 观察到的TGM度最高,在南大西洋 (0.61 ± 0.28 ng m−3) 观察到的最低.
- 白天TGM度显著增加,特别是在南印度洋和南大洋.
- 在TGM和太阳辐射之间发现了强烈的正相关性 (R2 = 0.680.92),这表明光还原是关键过程.
结论:
- 在南半球,海洋是白天TGM的净来源.
- 海水中的水性光降解是影响大气水平和生物地化学循环的重要过程.
- 微生物生产率和紫外线辐射比率可能会影响白天TGM振幅.
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