变态溶解有机物 (DOM) 和输入改变了温室气体动态:长江源至河口的源至河口研究
Jiarui Li1, Enhang Liang1, Chunfang Deng1
1College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, PR China; State Environmental Protection Key Laboratory of All Materials Flux in River Ecosystems, Beijing 100871, PR China.
Water research
|February 22, 2024
概括
长江等大河是温室气体 (GHG) 的重要来源. 不稳定溶解有机物 (DOM) 和输入是溶解温室气体 (dGHG) 变化的关键驱动因素,影响全球预算.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 河流生态 河流生态
背景情况:
- 河流被认为是大气温室气体 (GHG) 的关键来源.
- 在大型,人为压力河流中,了解溶解GHG (dGHG) 时空变化的驱动因素是有限的.
- 加剧的水文循环进一步使dGHG动态变得复杂.
研究的目的:
- 研究长江溶解温室气体 (dGHG) 时空变化的驱动因素.
- 评估可变溶解有机物 (DOM) 和输入对dGHG分布的影响.
- 分析dGHG的纵向和季节性模式,并将当前数据与历史趋势进行比较.
主要方法:
- 在2018年春季和秋季对长江进行源至河口的调查.
- 测量了溶解的CO2,CH4和N2O的度.
- 分析了不稳定的溶解有机物 (DOM) 成分和含量.
主要成果:
- 长江的平均二氧化碳度低于全球平均水平.
- 在春季的中下游地区观察到更高的温室气体度.
- 不稳定,类似蛋白质的DOM成分和含量是dGHG变化的主要驱动因素.
- 在2004年至2018年期间,观察到N2O度的显著增加,与含量上升相关.
结论:
- 不稳定的DOM和输入极大地影响空间热点,季节性变化和大型河流中二氧化碳的年度趋势.
- 调查结果有助于改进全球温室气体预算估计.
- 结果为控制全球变化下的大型河流温室气体排放策略提供了信息.
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