An online model of methane in the atmosphere

The radiative forcings of CO2 and methane compared. The scenario is more-or-less comparable to 750 ppm CO2, as we thought.

The CO2 concentration used to generate the last figure.

Timing is everything

Four simulations with the same amount of carbon released as methane in the “spike”, on different time scales for the release.

10 Gton C release in 1 year — the spike.

Same spike but not as sharp: 10 Gton over 20 years.

Same 10 Gton but spread over 50 years.

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