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首页> 美国卫生研究院文献>Scientific Reports >Sediment fluxes rather than oxic methanogenesis explain diffusive CH4 emissions from lakes and reservoirs
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Sediment fluxes rather than oxic methanogenesis explain diffusive CH4 emissions from lakes and reservoirs

机译：沉积物通量而非有氧的甲烷生成解释了湖泊和水库的CH4扩散排放

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摘要

Methane emissions from lakes and reservoirs are a major natural source in the global budget of atmospheric CH4. A large fraction of these emissions are due to diffusive transport of CH4 from surface waters to the atmosphere. It was suggested recently that CH4 production in the oxic surface waters is required to compensate for diffusive CH4 emissions from lakes. In contrast, we demonstrate here that typical diffusive CH4-fluxes from sediments in shallow water zones, Fsed,S, suffice to explain CH4 emissions to the atmosphere. Our analysis is based on the combination of an exceptional data set on surface concentrations of CH4 with a mass balance model of CH4 that is focused on the surface mixed layer and considers CH4-fluxes from sediments, lateral transport, gas exchange with the atmosphere, and includes temperature dependencies of sediment fluxes and gas exchange. Fsed,S not only explains observed surface CH4 concentrations but also concentration differences between shallow and open water zones, and the seasonal variability of emissions and lateral concentration distributions. Hence, our results support the hypothesis that diffusive fluxes from shallow sediments and not oxic methanogenesis are the main source of the CH4 in the surface waters and the CH4 emitted from lakes and reservoirs.
机译：湖泊和水库的甲烷排放是全球大气中CH4预算的主要自然来源。这些排放中的很大一部分归因于CH4从地表水到大气的扩散传输。最近有人建议，需要在有氧地表水中生产CH4来补偿湖泊中CH4的扩散排放。相反，我们在此证明，浅水区Fsed，S中来自沉积物的典型CH4扩散通量足以解释CH4向大气的排放。我们的分析基于CH4表面浓度的特殊数据集与CH4的质量平衡模型的结合，该模型着重于表面混合层，并考虑了来自沉积物，横向输送，与大气的气体交换以及包括沉积物通量和气体交换的温度依赖性。 Fsed，S不仅解释了观测到的地表CH4浓度，而且解释了浅水区和开放水区之间的浓度差异，以及排放量和横向浓度分布的季节变化。因此，我们的结果支持以下假说：浅层沉积物的扩散通量而不是有氧的甲烷生成是地表水CH4以及湖泊和水库排放的CH4的主要来源。

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