Articles | Volume 15, issue 5
Atmos. Chem. Phys., 15, 2595–2612, 2015
https://doi.org/10.5194/acp-15-2595-2015
Atmos. Chem. Phys., 15, 2595–2612, 2015
https://doi.org/10.5194/acp-15-2595-2015

Research article 09 Mar 2015

Research article | 09 Mar 2015

Variations in global methane sources and sinks during 1910–2010

A. Ghosh et al.

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Short summary
Atmospheric CH4 increased from 900ppb to 1800ppb during the period 1900–2010 at a rate unprecedented in any observational records. We use bottom-up emissions and a chemistry-transport model to simulate CH4. The optimized global total CH4 emission, estimated from the model–observation differences, increased at fastest rate during 1940–1990. Using δ13C of CH4 measurements we attribute this emission increase to biomass burning. Total CH4 lifetime is shortened by 4% over the simulation period.
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