从高度扰乱的城市内陆水域产生意想不到的低CO2排放
Gongqin Wang1, Shaoda Liu2, Siyue Sun2
1Key Laboratory of Water and Sediment Sciences of Ministry of Education, State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, School of Eco-Environment, Hebei University, Baoding, 071002, Hebei, China.
Environmental research
|July 20, 2023
概括
城市内陆水域表现出独特的温室气体 (GHG) 排放概况,尽管二氧化碳水平高,但二氧化碳 (CO2) 流量明显低于全球平均水平. 这凸显了需要具体的水生温室气体管理战略的需要.
科学领域:
- 环境科学 环境科学
- 水生化学 水生化学
- 气候变化研究 气候变化研究
背景情况:
- 城市内陆水域受到废水排放的严重影响,改变了它们的化学成分和功能.
- 了解这些城市水生系统中的温室气体 (GHG) 动态至关重要,但由于缺乏现场数据而受到限制.
- 现有的知识差距阻碍了城市河流和湖泊温室气体排放的有效管理.
研究的目的:
- 量化北京城市河流和湖泊的二氧化碳 (CO2) 排放量和相关水生因素.
- 调查城市水域中二氧化碳动态,优化和气体汇率之间的关系.
- 将城市内陆水域的温室气体排放概况与全球平均值和大气温室气体贡献进行比较.
主要方法:
- 从2018年到2020年在北京的城市河流和湖泊进行了为期3年的实地活动.
- 测量了CO2的局部压力 (pCO2) 和计算了CO2流量.
- 评估了关键的水生因素,包括气体交换率 (k600) 和环氧化指标.
主要成果:
- 城市湖泊的pCO2平均值低于全球非热带淡水湖泊,近一半的观测结果呈负二氧化碳流量.
- 城市河流平均pCO2高,但由于气体交换率降低,二氧化碳流量明显低于全球河流 (平均k600的1.3m d-1).
- 欧化对光合作用和溶解有机碳的影响与pCO2没有明显的相关性,表明复杂的相互作用.
结论:
- 二氧化碳排放量仅占北京城市水域总温室气体排放相当量的32%,与大气中二氧化碳占主导地位不同.
- 城市内陆水域具有独特的温室气体排放特征,与自然水生系统和大气不同.
- 对于城市环境的水生温室气体排放,需要专门的会计和管理策略.
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