Operational effects on aquatic carbon dioxide and methane emissions from the Belo Monte hydropower plant in the Xingu River, eastern Amazonia
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作者:
de Araujo, Kleiton R.
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Univ Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, BrazilUniv Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
de Araujo, Kleiton R.
[1
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Sawakuchi, Henrique O.
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Linkoping Univ, Dept Themat Studies, Environm Change, S-58183 Linkoping, SwedenUniv Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
Sawakuchi, Henrique O.
[2
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Bertassoli Jr, Dailson J.
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Univ Sao Paulo, Dept Geol Sedimentar & Ambiental, Inst Geociencias, BR-05508080 Sao Paulo, BrazilUniv Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
Bertassoli Jr, Dailson J.
[3
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Bastviken, David
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Linkoping Univ, Dept Themat Studies, Environm Change, S-58183 Linkoping, SwedenUniv Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
Bastviken, David
[2
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Pereira, Tatiana S.
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Univ Fed Para, Fac Ciencias Biol, BR-68372040 Altamira, BrazilUniv Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
Pereira, Tatiana S.
[4
]
Sawakuchi, Andre O.
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Univ Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
Univ Sao Paulo, Dept Geol Sedimentar & Ambiental, Inst Geociencias, BR-05508080 Sao Paulo, BrazilUniv Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
Sawakuchi, Andre O.
[1
,3
]
机构:
[1] Univ Sao Paulo, Programa Pos Grad Geoquim & Geotecton, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
Operational demands and the natural inflow of water actively drive biweekly fluctuations in water levels in hydropower reservoirs. These daily to weekly fluctuations could have major effects on methane (CH4) and carbon dioxide (CO2) emissions via release of bubbles from reservoir bottom sediments (ebullition) or organic matter inputs, respectively. The impact of transient fluctuations in water levels on GHG emissions is poorly understood and particularly so in tropical run-of-the-river reservoirs. These reservoirs, characterized by high temperatures and availability of labile organic matter, are usually associated with extensive CH4 generation within bottom sediments. The aim of this study is to determine how water level fluctuations resulting from the operation of the Belo Monte hydropower plant on the Xingu River, eastern Amazon River Basin, affect local CO2 and CH4 emissions. Between February and December 2022, we monitored weekly fluxes and water concentrations of CO2 and CH4 in a site on the margin of the Xingu reservoir. Throughout the study period, fluxes of CO2 and CH4 were 118 +/- 137 and 3.62 +/- 8.47 mmol m- 2 d-1 (average +/- 1SD) while concentrations were 59 +/- 29.77 and 0.30 +/- 0.12 mu M, respectively. The fluxes and water concentrations of CO2 were clearly correlated with the upstream discharge, and the variation observed was more closely associated with a seasonal pattern than with biweekly fluctuations in water level. However, CH4 fluxes were significantly correlated with biweekly water level fluctuations. The variations observed in CH4 fluxes occurred especially during the high-water season (February-April), when biweekly water level fluctuations were frequent and had higher amplitude, which increased CH4 ebullition. Reducing water level fluctuations during the high-water season could decrease ebullitive pulses and, consequently, total flux of CH4 (TFCH4) in the reservoir margins. This study underscores the critical role of water level fluctuations in near-shore CH4 emissions within tropical reservoirs and highlights significant temporal variability. However, additional research is necessary to understand how these findings can be applied across different spatial scales.
机构:
Univ Tras Os Montes & Alto Douro, CITAB Ctr Res & Technol Agroenvironm & Biol Sci, P-5001801 Vila Real, PortugalInst Politecn Viseu, Agr Polytech Sch Viseu, P-3500606 Viseu, Portugal
Goufo, Piebiep
Carneiro, Joao
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Univ Tras Os Montes & Alto Douro, CITAB Ctr Res & Technol Agroenvironm & Biol Sci, P-5001801 Vila Real, Portugal
Escola Super Agr, Inst Politecn Castelo Branco, CERNAS Ctr Study Nat Resources Environm & Soc, P-6001909 Castelo Branco, PortugalInst Politecn Viseu, Agr Polytech Sch Viseu, P-3500606 Viseu, Portugal
Carneiro, Joao
Morais, Raul
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UTAD Univ Tras Os Montes & Alto Douro, INESC TEC INESC Technol & Sci, P-5001801 Vila Real, PortugalInst Politecn Viseu, Agr Polytech Sch Viseu, P-3500606 Viseu, Portugal
Morais, Raul
Carranca, Corina
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INIAV, P-2784505 Oeiras, Portugal
ISA UTL, CEER, P-1349017 Lisbon, PortugalInst Politecn Viseu, Agr Polytech Sch Viseu, P-3500606 Viseu, Portugal
Carranca, Corina
Coutinho, Joao
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Univ Tras Os Montes & Alto Douro, Dept Biol & Environm, Ctr Chem, P-5001801 Vila Real, PortugalInst Politecn Viseu, Agr Polytech Sch Viseu, P-3500606 Viseu, Portugal
Coutinho, Joao
Trindade, Henrique
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Univ Tras Os Montes & Alto Douro, CITAB Ctr Res & Technol Agroenvironm & Biol Sci, P-5001801 Vila Real, PortugalInst Politecn Viseu, Agr Polytech Sch Viseu, P-3500606 Viseu, Portugal
机构:
Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R ChinaChinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Zhang, Yulan
Kang, Shichang
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Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R ChinaChinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Kang, Shichang
Wei, Da
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机构:
Chinese Acad Sci, Key Lab Mt Surface Proc & Ecol Regulat, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaChinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Wei, Da
Luo, Xi
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Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaChinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Luo, Xi
Wang, Zhuangzhuang
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Chinese Acad Sci, Key Lab Mt Surface Proc & Ecol Regulat, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaChinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China
Wang, Zhuangzhuang
Gao, Tanguang
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机构:
Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R ChinaChinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Peoples R China