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Natural lakes are a minor global source of N2O to the atmosphere

Lauerwald, R. (författare)
Université Libre de Bruxelles, Bruxelles, Belgium
Regnier, P. (författare)
Université Libre de Bruxelles, Bruxelles, Belgium
Figueiredo, V (författare)
University Federal of Rio de Janeiro, Rio de Janeiro, Brazil
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Enrich Prast, Alex, 1972- (författare)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,University Federal of Rio de Janeiro, Rio de Janeiro, Brazil
Bastviken, David, 1971- (författare)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Lehner, B. (författare)
McGill University, Montreal, Canada
Maavara, T. (författare)
Lawrence Berkeley National Laboratory, Berkeley, USA
Raymond, P. (författare)
Yale School of Forestry and Environmental Studies, New Haven, USA
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 (creator_code:org_t)
Wiley-Blackwell, 2019
2019
Engelska.
Ingår i: Global Biogeochemical Cycles. - : Wiley-Blackwell. - 0886-6236 .- 1944-9224. ; 33:12, s. 1564-1581
Relaterad länk:
https://liu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Natural lakes and reservoirs are important, yet not well constrained sources of greenhouse gasses to the atmosphere. In particular for N2O emissions, a huge variability is observed in the few, observation‐driven flux estimates that have been published so far. Recently, a process‐based, spatially explicit model has been used to estimate global N2O emissions from more than 6,000 reservoirs based on nitrogen (N) and phosphorous inflows and water residence time. Here, we extend the model to a dataset of 1.4 million standing water bodies comprising natural lakes and reservoirs. For validation, we normalized the simulated N2O emissions by the surface area of each water body and compared them against regional averages of N2O emission rates taken from the literature or estimated based on observed N2O concentrations. We estimate that natural lakes and reservoirs together emit 4.5±2.9 Gmol N2O‐N yr‐1 globally. Our global scale estimate falls in the far lower end of existing, observation‐driven estimates. Natural lakes contribute only about half of this flux, although they contribute 91% of the total surface area of standing water bodies. Hence, the mean N2O emission rates per surface area are substantially lower for natural lakes than for reservoirs with 0.8±0.5 mmol N m‐2yr‐1 vs. 9.6±6.0 mmol N m‐2yr‐1, respectively. This finding can be explained by on average lower external N inputs to natural lakes. We conclude that upscaling based estimates, which do not distinguish natural lakes from reservoirs, are prone to important biases.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)

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