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DelSontro, Beaulieu & Downing- files for SI- Greenhouse gas emissions from lakes and impoundments: upscaling in the face of global change. Limnology and Oceanography Letters doi: 10.1002/lol2.10073
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modified on 2018-03-29, 12:36 Lakes and impoundments are important sources of greenhouse gases (GHG: i.e.,
CO2, CH4, N2O), 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. Published traditional
upscaling approaches overestimated CO2 and N2O emission
but underestimated CH4 by half. Our upscaled size-productivity
weighted estimates (1.25-2.3 Pg of CO2-equivalents annually) are nearly
30% of global CO2 fossil fuel emission with 75% of the climate
impact due to CH4. 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 current land use change.