Eutrophication will increase methane emissions from lakes and impoundments during the 21st century
Eutrophication will increase methane emissions from lakes and impoundments during the 21st century
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DOI：
10.1038/s41467-019-09100-5
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发表时间：
2019-03-26
影响因子：
16.6
通讯作者：
Downing, John A.
中科院分区：
文献类型：
--
作者：
Beaulieu, Jake J.;DelSontro, Tonya;Downing, John A.
湖泊和蓄水池是大气中甲烷（CH 4）的重要来源，甲烷是一种潜在的温室气体。最近的一项分析表明，水产生产力（即，富营养化）是缓慢沃茨排放甲烷的一个重要驱动因素。考虑到由于气候变化和人口增长，水产生产力将在下个世纪增加，因此可能会出现水产CH 4排放量的相应增加。我们模拟了在未来内陆沃茨营养负荷的情景下，静水沃茨的富营养化，并表明湖泊和蓄水池的富营养化增强将在下一个世纪大幅增加这些系统的CH 4排放量（+30-90%）。这种增加的甲烷排放对大气的影响为1.7-2.6 Pg C-CO2-eq y（-1），相当于燃烧化石燃料每年CO2排放量的18-33%。因此，不仅必须限制富营养化以保护脆弱的水供应，而且还必须避免气候变化的加速。
Lakes and impoundments are an important source of methane (CH4), a potent greenhouse gas, to the atmosphere. A recent analysis shows aquatic productivity (i.e., eutrophication) is an important driver of CH4 emissions from lentic waters. Considering that aquatic productivity will increase over the next century due to climate change and a growing human population, a concomitant increase in aquatic CH4 emissions may occur. We simulate the eutrophication of lentic waters under scenarios of future nutrient loading to inland waters and show that enhanced eutrophication of lakes and impoundments will substantially increase CH4 emissions from these systems (+30-90%) over the next century. This increased CH4 emission has an atmospheric impact of 1.7-2.6 Pg C-CO2-eq y(-1), which is equivalent to 18-33% of annual CO2 emissions from burning fossil fuels. Thus, it is not only important to limit eutrophication to preserve fragile water supplies, but also to avoid acceleration of climate change.