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Video Introduction
The METHANE model tracks the concentration of methane in the global atmosphere. The lifetime of methane in the atmosphere is about a decade (more or less, depending on how much is being released). The atmosphere itself mixes in about a year, so methane concentrations in the air rise and fall everywhere around the globe depending on the global rates of release to the atmosphere and decomposition.

The model simulation goes in three stages. The first is a Natural stage, intended to roughly mimic the natural emission fluxes and atmospheric concentrations in a World Without Us. The second is an Anthropocene stage, where we are at present. The time evolution from natural to industrial is not intended to be realistic, but the model shows the relaxation to the equilibrium condition for each state. The third state adds the release of a user-determined Slug or spike of methane, to be released over a user-determined release timescale. If the release time scale is short, the result will be a spike and recovery of atmospheric methane concentration. If it's long, the concentration will reach a new plateau until the end of the slug release.

The global sources (blue) and atmospheric decomposition sinks (red) of methane.

We can't directly change the natural emissions of methane, so neither can you on the methane page. You can however change the Anthropogenic emission of methane, and the Slug size and duration of a stock of methane to be released at a constant rate throughout the time scale you choose.

The available plots include the methane concentration, the budget with global sources and sinks, the impact of the changing methane concentration on it atmospheric lifetime, and it radiative forcing (compared with that from business-as-usual rise in atmospheric CO2 concentration.

Make a plot of the steady-state methane concentration in the atmosphere as a function of the emission rate.
Compare the radiative forcings from a spike of methane emission to that from business-as-usual atmospheric CO2 rise.
See the effect of the release time scale of a slug of methane emission.
The model is based on Schmidt and Schindell, PALEOCEANOGRAPHY, VOL. 18, NO. 1, 1004, doi:10.1029/2002PA000757, 2003.