沸在分层沿海水域中主导甲排放
Martijn Hermans1, Christian Stranne2, Elias Broman3
1Baltic Sea Centre, Stockholm University, Stockholm, Sweden; Environmental Geochemistry Group, Department of Geosciences and Geography, Faculty of Science, University of Helsinki, Helsinki, Finland.
The Science of the total environment
|June 23, 2024
概括
沿海甲 (CH4) 的来源仍然不确定. 沸,而不是扩散,是分层盐沿海水域中甲的可能来源,影响气候反.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 海洋生物学 海洋生物学
背景情况:
- 沿海地区是大气甲 (CH4) 的重要来源.
- 了解沿海水域的CH4来源和监管对于气候变化反评估至关重要.
- 现有的关于表面沿海水域中CH4来源和随后的海空气排放的知识是有限的.
研究的目的:
- 在波罗的海的Tvärminne群岛调查沿海甲 (CH4) 动态.
- 确定主要来源和调节CH4形成和氧化过程的过程.
- 在不同的环境条件下,在近岸和离岸站之间比较CH4生物地质化学和微生物学.
主要方法:
- 从Tvärminne群岛的六个站点收集水柱数据.
- 在近岸和离岸地点进行深入的沉积物生物地质化学和微生物学分析.
- 在沉积物和水柱中分析同位素特征 (δ13C-CH4).
- 评估水柱中CH4的产量和盆地扩散速率.
主要成果:
- 由于高氧化率,近岸站的甲 (CH4) 从沉积物扩散到水中是可以忽略不计的.
- 在海上站发生了显著的地CH4扩散,但氧化限制了流向水柱的流量.
- 发现水柱CH4产量可以忽略不计.
- 在分层地表水中的同位素特征 (δ13C-CH4) 表明沸,而不是扩散,是主要的CH4来源.
结论:
- 盐沿海系统中的甲 (CH4) 动态是复杂的,受分层和氧化还原条件的影响.
- 氧化过程显著减少了CH4从沉积物流向水柱的流量.
- 沸被假设为CH4转移到地表水中的主要途径,在分层盐的沿海环境中,对海空气排放有影响.
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