Urban landscapes and legacy industry provide hotspots for riverine greenhouse gases: A source-to-sea study of the River Clyde.
Urban landscapes and legacy industry provide hotspots for riverine greenhouse gases: A source-to-sea study of the River Clyde.
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DOI：
10.1016/j.watres.2023.119969
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发表时间：
2023-04
期刊：
影响因子：
12.8
通讯作者：
Alison M. Brown;A. Bass;U. Skiba;J. MacDonald;A. Pickard
中科院分区：
文献类型：
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作者：
Alison M. Brown;A. Bass;U. Skiba;J. MacDonald;A. Pickard
全球越来越担心，由于营养水平与气候变暖之间的相互作用，水体的温室气体（GHG）排放量正在增加。本文通过对苏格兰克莱德河源头到海洋的详细研究中的半自然、农业和城市环境进行比较，研究了温室气体的关键土地覆盖、季节和水文控制。河流温室气体浓度相对于大气始终处于过饱和状态。河流甲烷 (CH4) 浓度高主要与城市废水处理、废弃煤矿和湖泊的点源流入有关，CH4-C 浓度在 0.1 - 44 µg l−1 之间。二氧化碳 (CO2) 和一氧化二氮 (N2O) 浓度主要由氮浓度驱动，以上游流域的分散农业投入为主，以下游流域城市废水的点源投入为补充，CO2-C 浓度在 0.1 - 2.6 mg l−1 之间，N2O-N 浓度在 0.3 - 3.4 µg l−1 之间。与冬季温室气体浓度较高的半自然环境相比，夏季下游城市河流环境中所有温室气体显着且不成比例地增加。温室气体季节模式的这种增加和变化表明了人为对微生物群落的影响。到河口的总溶解碳损失约为48.4±3.6 Gg C yr−1，年无机碳输出量约为有机碳的2倍，CO2的4倍，其中CH4占0.03%，废弃煤矿的人为影响加速了DIC的损失。每年流入河口的总溶解氮约为 4.03 ± 0.38 Gg N yr−1，其中 N2O 占 0.06%。这项研究提高了我们对河流温室气体产生和动态的了解，这有助于我们了解它们向大气中的排放。它确定了哪些行动可以支持减少水生温室气体的产生和排放。
There is growing global concern that greenhouse gas (GHG) emissions from water bodies are increasing because of interactions between nutrient levels and climate warming. This paper investigates key land-cover, seasonal and hydrological controls of GHGs by comparison of the semi-natural, agricultural and urban environments in a detailed source-to-sea study of the River Clyde, Scotland. Riverine GHG concentrations were consistently oversaturated with respect to the atmosphere. High riverine concentrations of methane (CH4) were primarily associated with point source inflows from urban wastewater treatment, abandoned coal mines and lakes, with CH4-C concentrations between 0.1 - 44 µg l−1. Concentrations of carbon dioxide (CO2) and nitrous oxide (N2O) were mainly driven by nitrogen concentrations, dominated by diffuse agricultural inputs in the upper catchment and supplemented by point source inputs from urban wastewater in the lower urban catchment, with CO2-C concentrations between 0.1 - 2.6 mg l−1and N2O-N concentrations between 0.3 - 3.4 µg l−1. A significant and disproportionate increase in all GHGs occurred in the lower urban riverine environment in the summer, compared to the semi-natural environment, where GHG concentrations were higher in winter. This increase and change in GHG seasonal patterns points to anthropogenic impacts on microbial communities. The loss of total dissolved carbon, to the estuary is approximately 48.4 ± 3.6 Gg C yr−1, with the annual inorganic carbon export approximately double that of organic carbon and four times that of CO2,with CH4accounting for 0.03%, with the anthropogenic impact of disused coal mines accelerating DIC loss. The annual loss of total dissolved nitrogen to the estuary is approximately 4.03 ± 0.38 Gg N yr−1of which N2O represents 0.06%. This study improves our understanding of riverine GHG generation and dynamics which can contribute to our knowledge of their release to the atmosphere. It identifies where action could support reductions in aquatic GHG generation and emission.