Abstract
Diffusive Fluxes of CH4 and CO2 at the Sediment-Overlying Water Interface in Reservoir Ecosystems
Highlights
Reservoirs form the subject of many studies considering a host of different aspects
When either allochthonous or autochthonous organic matter dies, it accumulates as deposits in bottom sediments, where it becomes subject to decomposition
While CO2 and CH4 from sediments can enter the water column – from where they can reach the atmosphere – by diffusion or ebullition, the amounts of the gases doing so are not equivalent to those generate by sediments, given that both gases may be consumed in the water column, i.e. as a result of photosynthesis or oxidation
Summary
Reservoirs form the subject of many studies considering a host of different aspects. where threats are concerned, one of the most fundamental and probably most commonly described one relates to an intensive supply with biogenic compounds (Bartoszek and Koszelnik 2016; Bartoszek and Tomaszek 2011, 2016), and consequent increases in primary production. When either allochthonous or autochthonous organic matter dies, it accumulates as deposits in bottom sediments, where it becomes subject to decomposition If this process takes place under anaerobic conditions, the ensuing fermentation generates gaseous end products in the form of both methane (CH4) and carbon dioxide (CO2), i.e. two key pollutants acting as greenhouse gases (IPPC 2007). While CO2 and CH4 from sediments can enter the water column – from where they can reach the atmosphere – by diffusion or ebullition, the amounts of the gases doing so are not equivalent to those generate by sediments, given that both gases may be consumed in the water column, i.e. as a result of photosynthesis or oxidation For this reason, a complete picture of the carbon cycle in reservoirs is only obtained where CH4 and CO2 fluxes are studied at both the sediment-overlying water and the water-air interfaces
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