Present state of global wetland extent and wetland methane modelling: methodology of a model intercomparison project (WETCHIMP).

The article presents information on the Wetland and Wetland CH4 Intercomparison of Models Project (WETCHIMP) that was created to evaluate the simulation of large-scale wetland characteristics and their associated methane (CH4) emissions. In WETCHIMP, there were three methods were used to estimate wetland extent, that were based on wetland distribution maps, prognostic relations between hydrological states that were based on satellite observations, and hydrological mass balances.