Methane emissions from lakes: Dependence of lake characteristics, two regional assessments, and a global estimate
Methane emissions from lakes: Dependence of lake characteristics, two regional assessments, and a global estimate
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DOI：
10.1029/2004gb002238
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发表时间：
2004-10-20
影响因子：
5.2
通讯作者：
Tranvik, L
中科院分区：
文献类型：
--
作者：
Bastviken, D;Cole, J;Tranvik, L
湖泊沉积物是景观中甲烷产生的“热点”。然而，区域和全球湖泊甲烷排放对温室效应的影响却知之甚少。我们根据11个北美和13个瑞典湖泊的测量结果，以及49个湖泊的文献值，从容易测量的湖泊特征中预测了甲烷排放。结果表明，湖泊面积、水深、总磷、溶解有机碳和甲烷浓度以及缺氧湖泊体积分数等变量均可预测开放水域甲烷排放。利用这些关系，我们提供了来自瑞典和美国中西部上游湖泊的区域估计。考虑到开放水域和植物介导的通量，我们估计全球排放量为8 - 48 Tg CH4年（-1）（占天然甲烷排放总量的6 - 16%，大于海洋排放），表明湖泊应作为全球甲烷预算的一个重要来源。
[ 1] Lake sediments are "hot spots'' of methane production in the landscape. However, regional and global lake methane emissions, contributing to the greenhouse effect, are poorly known. We developed predictions of methane emissions from easily measured lake characteristics based on measurements for 11 North American and 13 Swedish lakes, and literature values from 49 lakes. Results suggest that open water methane emission can be predicted from variables such as lake area, water depth, concentrations of total phosphorus, dissolved organic carbon, and methane, and the anoxic lake volume fraction. Using these relations, we provide regional estimates from lakes in Sweden and the upper midwest of the United States. Considering both open water and plant-mediated fluxes, we estimate global emissions as 8 - 48 Tg CH4 yr(-1) (6 - 16% of total natural methane emissions and greater than oceanic emission), indicating that lakes should be included as a significant source in global methane budgets.