气候变化领域集成服务门户(CCPortal): Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir

CCPortal

DOI	10.1073/pnas.2026004118
	Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir
	Calamita E.; Siviglia A.; Gettel G.M.; Franca M.J.; Scott Winton R.; Teodoru C.R.; Schmid M.; Wehrli B.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:25
英文摘要	Recent studies show that tropical hydroelectric reservoirs may be responsible for substantial greenhouse gas emissions to the atmosphere, yet emissions from the surface of released water downstream of the dam are poorly characterized if not neglected entirely from most assessments. We found that carbon dioxide (CO2) emission downstream of Kariba Dam (southern Africa) varied widely over different timescales and that accounting for downstream emissions and their fluctuations is critically important to the reservoir carbon budget. Seasonal variation was driven by reservoir stratification and the accumulation of CO2 in hypolimnetic waters, while subdaily variation was driven by hydropeaking events caused by dam operation in response to daily electricity demand. This “carbopeaking” resulted in hourly variations of CO2 emission up to 200% during stratification. Failing to account for seasonal or subdaily variations in downstream carbon emissions could lead to errors of up to 90% when estimating the reservoir’s annual emissions. These results demonstrate the critical need to include both limnological seasonality and dam operation at subdaily time steps in the assessment of carbon budgeting of reservoirs and carbon cycling along the aquatic continuum. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Carbon emissions \| hydropower dams \| river damming \| reservoir carbon budget
语种	英语
scopus关键词	carbon dioxide; Africa; Article; carbon cycling; carbon footprint; catchment area (hydrology); dam (barrier); electricity; hydropower; seasonal variation; tropics
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238516
作者单位	aInstitute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, 8092, Switzerland; Department of Surface Waters, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum, 6047, Switzerland; Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, 38123, Italy; IHE Delft Institute for Water Education, Delft, 2611 AX, Netherlands; Department of Hydraulic Engineering, Delft University of Technology, Delft, 2628 CD, Netherlands
推荐引用方式 GB/T 7714	Calamita E.,Siviglia A.,Gettel G.M.,et al. Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir[J],2021,118(25).
APA	Calamita E..,Siviglia A..,Gettel G.M..,Franca M.J..,Scott Winton R..,...&Wehrli B..(2021).Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir.Proceedings of the National Academy of Sciences of the United States of America,118(25).
MLA	Calamita E.,et al."Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir".Proceedings of the National Academy of Sciences of the United States of America 118.25(2021).