Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2026004118 |
Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir | |
Elisa Calamita; Annunziato Siviglia; Gretchen M. Gettel; Mário J. Franca; R. Scott Winton; Cristian R. Teodoru; Martin Schmid; Bernhard Wehrli | |
2021-06-22 | |
发表期刊 | Proceedings of the National Academy of Sciences
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出版年 | 2021 |
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. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/330734 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Elisa Calamita,Annunziato Siviglia,Gretchen M. Gettel,et al. Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir[J]. Proceedings of the National Academy of Sciences,2021. |
APA | Elisa Calamita.,Annunziato Siviglia.,Gretchen M. Gettel.,Mário J. Franca.,R. Scott Winton.,...&Bernhard Wehrli.(2021).Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir.Proceedings of the National Academy of Sciences. |
MLA | Elisa Calamita,et al."Unaccounted CO2 leaks downstream of a large tropical hydroelectric reservoir".Proceedings of the National Academy of Sciences (2021). |
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