Extreme Methane Emissions from a Swiss Hydropower Reservoir: Contribution from Bubbling Sediments.

DelSontro, Tonya, McGinnis, Daniel, Sobek, Sebastian, Ostrovsky, Ilia and Wehrli, Bernhard (2010) Extreme Methane Emissions from a Swiss Hydropower Reservoir: Contribution from Bubbling Sediments. Environmental Science & Technology, 44 (7). pp. 2419-2425. DOI 10.1021/es9031369.

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Abstract

Methane emission pathways and their importance were quantified during a yearlong survey of a temperate hydropower reservoir. Measurements using gas traps indicated very high ebullition rates, but due to the stochastic nature of ebullition a mass balance approach was crucial to deduce system-wide methane sources and losses. Methane diffusion from the sediment was generally low and seasonally stable and did not account for the high concentration of dissolved methane measured in the reservoir discharge. A strong positive correlation between water temperature and the observed dissolved methane concentration enabled us to quantify the dissolved methane addition from bubble dissolution using a system-wide mass balance. Finally, knowing the contribution due to bubble dissolution, we used a bubble model to estimate bubble emission directly to the atmosphere. Our results indicated that the total methane emission from Lake Wohlen was on average >150 mg CH4 m−2 d−1, which is the highest ever documented for a midlatitude reservoir. The substantial temperature-dependent methane emissions discovered in this 90-year-old reservoir indicate that temperate water bodies can be an important but overlooked methane source.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1021/es9031369
ISSN: 0013-936X
Date Deposited: 31 Mar 2010 09:28
Last Modified: 07 Mar 2017 09:41
URI: http://oceanrep.geomar.de/id/eprint/5996

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