Open AccessGreenhouse gas emissions from lakes and impoundments: Upscaling in the face of global change
Author(s) -
DelSontro Tonya,
Beaulieu Jake J.,
Downing John A.
Publication year - 2018
Publication title -
limnology and oceanography letters
Language(s) - English
Resource type - Journals
ISSN - 2378-2242
DOI - 10.1002/lol2.10073
Subject(s) - greenhouse gas , environmental science , fossil fuel , productivity , atmospheric sciences , climate change , global warming , trophic level , eutrophication , combustion , atmosphere (unit) , global change , physical geography , climatology , meteorology , ecology , geography , oceanography , geology , chemistry , biology , organic chemistry , nutrient , economics , macroeconomics
Abstract 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.