DOI: 10.1038/s41561-021-00734-z
论文题名: Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
作者: Keller P.S. ; Marcé R. ; Obrador B. ; Koschorreck M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 6 起始页码: 402
结束页码: 408
语种: 英语
英文关键词: air-water interaction
; carbon budget
; carbon dioxide
; carbon emission
; carbon sink
; drawdown
; preservation
; reservoir
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169770
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Keller P.S.,Marcé R.,Obrador B.,et al. Global carbon budget of reservoirs is overturned by the quantification of drawdown areas[J]. Nature Geoscience,2021-01-01,14(6)