气候变化领域集成服务门户(CCPortal): Natural Lakes Are a Minor Global Source of N2O to the Atmosphere

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DOI	10.1029/2019GB006261
	Natural Lakes Are a Minor Global Source of N2O to the Atmosphere
	Lauerwald R.; Regnier P.; Figueiredo V.; Enrich-Prast A.; Bastviken D.; Lehner B.; Maavara T.; Raymond P.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	1564
结束页码	1581
卷号	33 期号:12
英文摘要	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 data set 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 year−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 versus 9.6 ± 6.0 mmol N·m−2·year−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. © 2019. The Authors.
英文关键词	global; greenhouse gas; lakes; nitrous oxide; reservoirs
语种	英语
scopus关键词	air-water interaction; global perspective; greenhouse gas; lake water; nitrous oxide; reservoir; surface area
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129685
作者单位	Biogeochemistry and Earth System Modelling, Department of Geoscience, Environment and Society, Université Libre de Bruxelles, Brussels, Belgium; Pos Graduation in Biotechnology, University Federal of Rio de Janeiro, Rio de Janeiro, Brazil; Department of Thematic Studies, Environmental Change Linköping University, Linköping, Sweden; Department of Geography, McGill University, Montreal, QC, Canada; Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Yale School of Forestry and Environmental Studies, New Haven, CT, United States
推荐引用方式 GB/T 7714	Lauerwald R.,Regnier P.,Figueiredo V.,et al. Natural Lakes Are a Minor Global Source of N2O to the Atmosphere[J],2019,33(12).
APA	Lauerwald R..,Regnier P..,Figueiredo V..,Enrich-Prast A..,Bastviken D..,...&Raymond P..(2019).Natural Lakes Are a Minor Global Source of N2O to the Atmosphere.Global Biogeochemical Cycles,33(12).
MLA	Lauerwald R.,et al."Natural Lakes Are a Minor Global Source of N2O to the Atmosphere".Global Biogeochemical Cycles 33.12(2019).