气候变化领域集成服务门户(CCPortal): Global carbon budget of reservoirs is overturned by the quantification of drawdown areas

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DOI	10.1038/s41561-021-00734-z
	Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
	Keller P.S.; Marcé R.; Obrador B.; Koschorreck M.
发表日期	2021
ISSN	17520894
起始页码	402
结束页码	408
卷号	14 期号:6
英文摘要	Reservoir drawdown areas—where sediment is exposed to the atmosphere due to water-level fluctuations—are hotspots for carbon dioxide (CO2) emissions. However, the global extent of drawdown areas is unknown, precluding an accurate assessment of the carbon budget of reservoirs. Here we show, on the basis of satellite observations of 6,794 reservoirs between 1985 and 2015, that 15% of the global reservoir area was dry. Exposure of drawdown areas was most pronounced in reservoirs close to the tropics and shows a complex dependence on climatic (precipitation, temperature) and anthropogenic (water use) drivers. We re-assessed the global carbon emissions from reservoirs by apportioning CO2 and methane emissions to water surfaces and drawdown areas using published areal emission rates. The new estimate assigns 26.2 (15–40) (95% confidence interval) TgCO2-C yr−1 to drawdown areas, and increases current global CO2 emissions from reservoirs by 53% (60.3 (43.2–79.5) TgCO2-C yr−1). Taking into account drawdown areas, the ratio between carbon emissions and carbon burial in sediments is 2.02 (1.04–4.26). This suggests that reservoirs emit more carbon than they bury, challenging the current understanding that reservoirs are net carbon sinks. Thus, consideration of drawdown areas overturns our conception of the role of reservoirs in the carbon cycle. © 2021, The Author(s).
英文关键词	air-water interaction; carbon budget; carbon dioxide; carbon emission; carbon sink; drawdown; preservation; reservoir
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206914
作者单位	Department of Lake Research, Helmholtz Centre for Environmental Research - UFZ, Magdeburg, Germany; Catalan Institute for Water Research (ICRA), Girona, Spain; Universitat de Girona, Girona, Spain; Department of Evolutionary Biology, Ecology and Environmental Sciences, Institut de Recerca de la Biodiversitat (IRBio), University of Barcelona, Barcelona, Spain
推荐引用方式 GB/T 7714	Keller P.S.,Marcé R.,Obrador B.,et al. Global carbon budget of reservoirs is overturned by the quantification of drawdown areas[J],2021,14(6).
APA	Keller P.S.,Marcé R.,Obrador B.,&Koschorreck M..(2021).Global carbon budget of reservoirs is overturned by the quantification of drawdown areas.Nature Geoscience,14(6).
MLA	Keller P.S.,et al."Global carbon budget of reservoirs is overturned by the quantification of drawdown areas".Nature Geoscience 14.6(2021).