Sediment Trapping by Dams Creates Methane Emission Hot Spots.

Maeck, Andreas, DelSontro, Tonya, McGinnis, Daniel F., Fischer, Helmut, Flury, Sabine, Schmidt, Mark , Fietzek, Peer and Lorke, Andreas (2013) Sediment Trapping by Dams Creates Methane Emission Hot Spots. Environmental Science & Technology, 47 (15). pp. 8130-8137. DOI 10.1021/es4003907.

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Inland waters transport and transform substantial amounts of carbon and account for 18% of global methane emissions. Large reservoirs with higher areal methane release rates than natural waters contribute significantly to freshwater emissions. However, there are millions of small dams worldwide that receive and trap high loads of organic carbon and can therefore potentially emit significant amounts of methane to the atmosphere. We evaluated the effect of damming on methane emissions in a central European impounded river. Direct comparison of riverine and reservoir reaches, where sedimentation in the latter is increased due to trapping by dams, revealed that the reservoir reaches are the major source of methane emissions (0.23 mmol CH4 m–2 d–1 vs 19.7 mmol CH4 m–2 d–1, respectively) and that areal emission rates far exceed previous estimates for temperate reservoirs or rivers. We show that sediment accumulation correlates with methane production and subsequent ebullitive release rates and may therefore be an excellent proxy for estimating methane emissions from small reservoirs. Our results suggest that sedimentation-driven methane emissions from dammed river hot spot sites can potentially increase global freshwater emissions by up to 7%

Document Type: Article
Additional Information: WOS:000323013400009
Keywords: Sediment trapping, inland waters, methane emissions
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1021/es4003907
ISSN: 0013-936X
Projects: MethaneFlux, Future Ocean
Date Deposited: 08 Oct 2013 09:05
Last Modified: 24 Sep 2019 00:00

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