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http://dx.doi.org/10.11614/KSL.2018.51.2.160

Methane Gas Emission from an Artificial Reservoir under Asian Monsoon Climate Conditions, with a Focus on the Ebullition Pathway  

Kim, Kiyong (Department of Environmetal Science, Kangwon National University)
Jung, Sungmin (Department of Environmetal Science, Kangwon National University)
Choi, Youngsoon (Watershed Environment Research Department, Han-River Environment Research Center)
Peiffer, Stefan (Hydrology department, University of Bayreuth)
Knorr, Klaus-Holger (Ecohydrology and Biogeochemistry Group, University of Munster)
Kim, Bomchul (Department of Environmetal Science, Kangwon National University)
Publication Information
Korean Journal of Ecology and Environment / v.51, no.2, 2018 , pp. 160-167 More about this Journal
Abstract
The role played by reservoirs in the biogeochemical cycles of elements is a subject of ongoing debate. Recent research has revealed that reservoirs emit significant levels of greenhouse gases. To assess the importance of reservoirs in monsoon climate areas as a source of methane gas into the atmosphere, we investigated variations in organic carbon (OC) input into the reservoir, oxic state changes, and finally the amount of methane emitted (focusing on the ebullition pathway) in Lake Soyang, which is the largest reservoir in South Korea. Total organic carbon (TOC) concentrations were higher during summer after two years of heavy rainfall. The sedimentation rates of particulate organic carbon (POC) and particulate organic nitrogen (PON) were higher in the epilimnion and hypolimnion than the metalimnioin, indicating that autochthonous and allochthonous carbon made separate contributions to the TOC. During stratification, oxygen depletion occurred in the hypolimnion due to the decomposition of organic matter. Under these conditions, $H_2S$ and $CH_4$ can be released from sediment. The methane emissions from the reservoir were much higher than from other natural lakes. However, the temporal and spatial variations of methane ebullition were huge, and were clearly dependent on many factors. Therefore, more research via a well-organized field campaign is needed to investigate methane emissions.
Keywords
methane; reservoir; monsoon; GHG; carbon;
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