Low Diffusive Methane Emissions From the Main Channel of a Large Amazonian Run-of-the-River Reservoir Attributed to High Methane Oxidation

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Sawakuchi, HenriqueLinköpings universitet,Tema Miljöförändring,Filosofiska fakulteten (författare)

Low Diffusive Methane Emissions From the Main Channel of a Large Amazonian Run-of-the-River Reservoir Attributed to High Methane Oxidation

Artikel/kapitelEngelska2021

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2021-04-08
Frontiers Media S.A.2021
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:liu-175607
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-175607URI
https://doi.org/10.3389/fenvs.2021.655455DOI

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Språk:engelska
Sammanfattning på:engelska

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Funding Agencies|FAPESPFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2011/14502-2, 2012/17359-9, 12/51187-0, 2014/21564-2, 2015/09187-1, 2018/18491-4]; Swedish Research Council VR grants [2012-00048, 2016-04829]; STINT grant [2012-2085]; European Research Council (ERC)European Research Council (ERC)European Commission [METLAKE 725546]; "Cientista do Nosso Estado" grant from FAPERJ; NSFNational Science Foundation (NSF) [DEB 1754317]
The global development of hydropower dams has rapidly expanded over the last several decades and has spread to historically non-impounded systems such as the Amazon Rivers main low land tributaries in Brazil. Despite the recognized significance of reservoirs to the global methane (CH4) emission, the processes controlling this emission remain poorly understood, especially in Tropical reservoirs. Here we evaluate CH4 dynamics in the main channel and downstream of the Santo Antonio hydroelectric reservoir, a large tropical run-of-the-river (ROR) reservoir in Amazonia. This study is intended to give a snapshot of the CH4 dynamics during the falling water season at the initial stage after the start of operations. Our results show substantial and higher CH4 production in reservoirs littoral sediment than in the naturally flooded areas downstream of the dam. Despite the large production in the reservoir or naturally flooded areas, high CH4 oxidation in the main channel keep the concentration and fluxes of CH4 in the main channel low. Similar CH4 concentrations in the reservoir and downstream close to the dam suggest negligible degassing at the dam, but stable isotopic evidence indicates the presence of a less oxidized pool of CH4 after the dam. ROR reservoirs are designed to disturb the natural river flow dynamics less than traditional reservoirs. If enough mixing and oxygenation remain throughout the reservoirs water column, naturally high CH4 oxidation rates can also remain and limit the diffusive CH4 emissions from the main channel. Nevertheless, it is important to highlight that our results focused on emissions in the deep and oxygenated main channel. High emissions, mainly through ebullition, may occur in the vast and shallow areas represented by bays and tributaries. However, detailed assessments are still required to understand the impacts of this reservoir on the annual emissions of CH4.

Ämnesord och genrebeteckningar

NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Oceanography, Hydrology and Water Resources hsv//eng
carbon; river; hydropower; methane; oxidation; aquatic; greenhouse gas

Biuppslag (personer, institutioner, konferenser, titlar ...)

Bastviken, DavidLinköpings universitet,Tema Miljöförändring,Filosofiska fakulteten(Swepub:liu)davba48 (författare)
Enrich Prast, AlexLinköpings universitet,Tema Miljöförändring,Filosofiska fakulteten(Swepub:liu)aleen07 (författare)
Ward, Nicholas D.Pacific Northwest Natl Lab, WA USA; Univ Washington, WA 98195 USA (författare)
Camargo, Plinio B.Univ Sao Paulo, Brazil (författare)
Richey, Jeffrey E.Univ Washington, WA 98195 USA (författare)
Linköpings universitetTema Miljöförändring (creator_code:org_t)

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Ingår i:Frontiers in Environmental Science: Frontiers Media S.A.92296-665X

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Av författaren/redakt...: Sawakuchi, Henri ...; Bastviken, David; Enrich Prast, Al ...; Ward, Nicholas D ...; Camargo, Plinio ...; Richey, Jeffrey ...

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