文章基本信息

标题：Greenhouse gas emissions from lakes and impoundments: Upscaling in the face of global change
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作者：Tonya DelSontro ; Jake J. Beaulieu ; John A. Downing 等
期刊名称：Limnology and Oceanography Letters
电子版ISSN：2378-2242
出版年度：2018
卷号：3
期号：3
页码：64-75
DOI：10.1002/lol2.10073
出版社：Wiley
摘要：Lakes and impoundments are important sources of greenhouse gases (GHG: i.e., CO 2 , CH 4 , N 2 O), yet global emission estimates are based on regionally biased averages and elementary upscaling. We assembled the largest global dataset to date on emission rates of all three GHGs and found they covary with lake size and trophic state. Fitted models were upscaled to estimate global emission using global lake size inventories and a remotely sensed global lake productivity distribution. Traditional upscaling approaches overestimated CO 2 and N 2 O emission but underestimated CH 4 by half. Our upscaled size‐productivity weighted estimates (1.25–2.30 Pg of CO 2 ‐equivalents annually) are nearly 20% of global CO 2 fossil fuel emission with ∼ 75% of the climate impact due to CH 4 . Moderate global increases in eutrophication could translate to 5–40% increases in the GHG effects in the atmosphere, adding the equivalent effect of another 13% of fossil fuel combustion or an effect equal to GHG emissions from current land use change.