The Global Methane Cycle. Methane. CH 4 Colorless gas Component of the atmosphere Main component of natural gas CH 4 + 2O 2 → CO 2 + 2H 2 0 . Why is methane important?. Clean fuel source It is a powerful greenhouse gas It removes Hydroxyls from the troposphere
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Hydrates & Clathrates
Losses of CH4 occur in lithosphere and the atmosphere
Lithosphere: Dry soil oxidation
Atmosphere: Trophospheric reactions with OH and losses to the stratosphere
'high capacity - low affinity' methanotrophs
’low capacity - high affinity' methanotrophs
Changes in land use practices, better fertilizer application, and land conversion may help prevent the loss of methane sinks.
-Control of methane emissions turns out to be a more powerful lever to control global warming than anticipated
-measuring level of gases after mixing with other gases in the atmosphere (official IPCC)
-measuring level of gases before entering atmosphere.
Goal: To recover Methane and use it as clean energy.
Collection of methane gas from landfills and treated
Why is this process interesting?
4 H2 + H+ + HCO3- CH4 + 3H2O
A new biogeochemical cycling pathway couples anaerobic methane oxidation to denitrification. (Nature; vol. 440, 04/06).
CH4 + NO3-/NO2- + H+ ---> CO2 + N2 + H2O