环氧化和脱氧化驱动来自的沿海系统的高甲排放
Olga M Żygadłowska1, Florian Roth2, Niels A G M van Helmond1,3
1Department of Earth Sciences─Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands.
Environmental science & technology
|June 5, 2024
概括
沿海的环氧化和脱氧化增加了甲排放. 沉积物中的浅层硫酸盐-甲过渡区是这一重大沿海海洋甲释放的关键热点.
科学领域:
- 环境科学 环境科学
- 海洋化学 海洋化学
- 地质化学 地质化学
背景情况:
- 沿海环境是大气甲的重要来源.
- 欧化和脱氧化可以增加沿海地区的甲释放.
研究的目的:
- 调查斯德哥尔摩群岛中化的甲动态.
- 确定控制沿海海洋环境中甲排放的因素.
主要方法:
- 研究了不同水柱氧化还原条件的不同地点的甲释放情况.
- 通过硫酸盐-甲过渡区 (SMTZ) 的评估有机物降解率深度.
- 测量了沉积物和水中的甲度和同位素组成.
主要成果:
- 在SMTZ浅处 (2-10厘米) 观察到的最高底甲释放量 (2.2-8.6 mmol m-2 d-1).
- 通过微生物过程,水柱中发生了显著的甲去除.
- 在甲中高13C的耗尽表明了大量的泡溶解.
- 大气中的甲流量在0.03至1.7mmol m-2 d-1之间,在浅浅的SMTZ和无氧底水中最高.
结论:
- 环氧化和脱氧化为沿海甲排放创造了热点.
- 浅浅的SMTZ和无氧,硫化基底水是导致高甲释放的关键因素.
- 了解这些动态对于预测未来气候影响至关重要.
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